22800111.CHP:Corel VENTURA

,

~

Returns And Exchanges

Damaged or undamaged equipment should not be returned unless written approval and a Return Authorization is received from HARRIS CORPORATION, Broadcast

Systems Division. Special shipping instructions and coding will be provided to assure proper handling. Complete details regarding circumstances and reasons for return are to be included in the request for return. Custom equipment or special order equipment is not returnable. In those instances where return or exchange of equipment is at the request of the customer, or convenience of the customer, a restocking fee will be charged. All returns will be sent freight prepaid and properly insured by the customer. When communicating with HARRIS CORPORATION,

Broadcast Systems Division, specify the HARRIS Order Number or Invoice

Number.

Unpacking

Carefully unpack the equipment and preform a visual inspection to determine that no apparent damage was incurred during shipment. Retain the shipping materials until it has been determined that all received equipment is not damaged. Locate and retain all PACKING CHECK LISTs. Use the PACKING CHECK LIST to help locate and identify any components or assemblies which are removed for shipping and must be reinstalled. Also remove any shipping supports, straps, and packing materials prior to initial turn on.

Technical Assistance

HARRIS Technical and Troubleshooting assistance is available from HARRIS Field

Service during normal business hours (8:00 AM - 5:00 PM Central Time). Emergency service is available 24 hours a day. Telephone

217/222-8200

to contact the

Field Service Department or address correspondence to Field Service Department,

HARRIS CORPORATION, Broadcast Systems Division, P.O. Box 4290, Quincy, illinois 62305-4290, USA. The HARRIS factory may also be contacted through a FAX facility

(217/221-7096).

Replaceable Parts Service

Replacement parts are available 24 hours a day, seven days a week from the

HARRIS Service Parts Department. Telephone

2171222-8200

to contact the service parts department or address correspondence to Service Parts Department, HAR-

RIS CORPORATION, Broadcast Systems Division, P.O. Box 4290, Quincy, Illinois

62305-4290, USA. The HARRIS factory may also be contacted through a FAX facility

(217/221-7096).

NOTE

The # symbol used in the parts list means used with (e.g. #COOl

= used with COOl).

Guide to Using Harris Parts Ust Information

The Harris Replaceable Parts List Index portrays a tree structUre willi the major items being leftmost in the index.

The example below shows the Transmitter as the highest item in the tree structure.

If

you were to look at the bill of materials table for the Transmitter you would find the Control Cabinet, the P A Cabinet, and the Output Cabinet In the Replaceable Parts List Index the Control Cabinet, P A Cabinet, and Output Cabinet show up one indentation level below the Transmitter and implies that they are used in the Transmitter. The Controller Board is Indented one level below the

Control Cabinet so it will show up in the bill of material for the Control Cabinet The tree structure of this same index is shown to the right of the table and shows indentation level versus tree structure level.

Example of Replaceable Parts List Index and equivalent tree structure:

Replaceable Ports List Index

Table 7-1.

Table 7-2.

Table 7-3.

Table 7-4.

Table 7-5.

Table 7-6.

Table 7-7.

Transmitter

Control Cabinet

Controller Boord

PA Cabinet

994 9283 001

992 9244 002

992 8344 002

992 9400 002

PA Amplifier 994 7894 002

PA Amplifier Boord 992 7904 002

Output Cabinet 992 9450 001

I

Transmitter

I

1994 9283 0011

7-2

7-3 .

7-6

7-7

7-9

7-10

7-12

=?

I

Control Cabinet

/ 992 9244 002

I

PA Cabinet

I

[output

Cabinet

L.:9~9~2~9:4tO~0 ~0~0~2J

992 9450 DOl r .

/controller Boord

1 [

PA Amplifier

1

992 8344 002 1 994 7894 002/

IPA

Amplifier Soard!

1 992 7904 002 1

The part number of the item

is

shown to the right of the deScription as is the page in the manual where the bill for that part number starts.

Inside the actual tables, four main headings are used:

Table

#-#.

ITEM NAME - HARRIS PART NUMBER - this line gives the information that corresponds to the

Replaceable Parts List Index entry;

HARRlS PiN column gives the ten digit Harris part number (usually in ascending order);

DESCRIPTION column gives a 25 character or less description of the part number;

REP. SYMBOLSIEXPLANATIONS column 1) gives the reference designators for the item (Le., COOl, RI02, etc.) that corresponds to the number found in the schematics (COOl in a bill of material is equivalent to

Clan the schematic) or 2) gives added informatidn or further explanation (i.e., "Used for 208V operation only," or "Used for lIT lOLS only," etc.).

Inside the individual tables some standard conventions are used:

A # symbol in front of a component such as #COOl under the REP. SYMBOLSIEXPLANATIONS column means that this item is used on or with COOl and is not the actual part number for COOL

In the ten digit part numbers, if the last three numbeIs are 000, the item is a part that Harris has purchased and has not manufactured or modified.

If

the last three numbers are other than

000, the item is either manufactured by

Harris or is purchased from a vendor and mOdified for use in the Harris product

The first three digits of the ten digit part number tell which family the part number belongs to - for example, all electrolytic (can) capaCitors will be in the same family

(521

xxxx 000).

If

an electrolytic (can) capacitor is found to have a 9xx xxxx xxx part number (a number outside of the normal family of numbers), it has probably been modified in some manner at the Harris factory and will therefore show up farther down into the individual parts list (because each table is normally sorted in ascending order). Most Harris made or modified assemblies will have 9xx xxxx xxx numbers associated with them.

The term "SEE mOHER LEVEL BILL" in the desCription column implies that the reference designated part number will show up in a bill that is higher in the tree structure. This is often the case for components that may be frequency determinant or voltage determinant and are called out in a higher level bill structure that is more customer dependent than the bill at a lower level.

2-02-93

~

I

IWARNING!

THE CURRENTS AND VOLTAGES IN TIDS EQUIPMENT ARE DANGEROUS. PER-

SONNEL MUST AT ALL TIMES OBSERVE SAFETY WARNINGS, INSTRUCTIONS

AND REGULATIONS.

This manual is intended as a general guide for trained and qualified personnel who are aware of the dangers inherent in handling potentially hazardous electrica1leleclroIlic circuits. It is not intended to contain a complete statement of

all

safety precautions which should be observed by personnel in using this or other electronic equipment

The installation, operation, maintenance and service of this equipment involves

risks

both to personnel and equipment, and must be performed only by qualified personnel exercising due care.

HARRlS

CORPORATION shall not be responsible for injury or damage resulting from improper procedures or from the use of improperly trained Or inexperienced persounel performing such tasks.

During installation and operation of this equipment, local building codes and fife protection standards must be observed.

The following National

Fife

Protection Association, (NFPA) standards are recommended as reference:

- Automatic Fire i:>eiectors, No.

72E

- Installation, Maintenance, and Use of Portable Fire Extinguishers, No. 10

- Halogenated Fire Extinguishing Agent Systems, No. 12A

IWARNlNGJ

ALWAYS DISCONNECT POWER BEFORE OPENING COVERS, DOORS, ENCLO-

SURES, GATES, PANELS OR SIDELDS. ALWAYS USE GROUNDING STICKS AND

SHORT OUT IDGH VOLTAGE POINTS BEFORE SERVICING. NEVER MAKE IN-

TERNAL ADJUSTMENTS, PERFORM MAINTENANCE OR SERVICE WHEN ALONE

OR WHEN FATIGUED. '

Do

not remove, short-i:ircuit or tamper with interlock switches on access covers, doors, enclosures, gates, panels or shiel$.

Keep away from live circuits, know your equipment and don't

take

chances.

IN CASE OF EMERGENCY ENSURE THAT POWER HAS BEEN DISCONNECTED.

, IF OIL FILLED OR ELECTROLYTIC CAPACITORS ARE UTILIZED IN YOUR

EQUIPMENT, AND IF A LEAK OR BULGE IS APPARENT ON THE CAPACITOR

CASE WHEN THE UNIT IS OPENED FOR SERVICE OR MAINTENANCE, ALLOW

THE UNIT TO COOL DOWN BEFORE ATTEMPTING TO REMOVE THE DEFEC-

TIVE CAPACITOR. DO NOT ATTEMPT TO SERVICE A DEFECTIVE CAI''&'CrrOR

WHILE IT IS HOT DUE TO THE POSSmILITY OF A CASE RUPTURE AND SUBSE-

QUENT INJURY. i

FIRST-AID

Personnel engaged in the installation, operation, maintenance or servicing of this equipment are urged to become familiar with first-aid theory and practices. The following information is not intended to be complete first-aid procedures, it

is

a brief and is only

to

be used as a reference.

It

is the duty of all personnel using the equipment

to

be prepared to give adequate Emergency First Aid and thereby prevent avoidable loss of life.

Trealment of Eleclrical Burns

1.

Extensive burned and broken skin a. Cover area with clean sbeet or cloth. (Cleanest available cloth article.) b. Do not

break

blisters, remove tissue, remove adhered particles of clothing, or apply any salve or oinlmenl c. Treat victiIIl for shock as required. d. Arrange transportation to a bospital as quickly as possible. e.

If

arms

or legs are

affeCted

keep them elevated.

NOTE

If medical belp will not

be

available within an bour and the victiIIl

is

conscious and not vomiling, give

him

a weak solution of salt and soda:

I

level teaspoonful of salt and

112

level teaspoonful of baking soda to eacb quart of water (neither bot or cold). Allow victiIIl to sip slowly about

4

ounces (a

half

of glass) over a period of

15

minutes. Disconlinue fluid if vomiting

occurs.

(Do not give alcobol)

2.

Less

severe

burns -

(1st

&

2nd degree) a. Apply cool (not ice Cold) compresses using the cleanest available cloth article. b.

Do

not

break

blisters, remove tissue, remove adhered particles of clothing, or apply salve or oinlmenl c. Apply clean

dry

dressing if necessary. d. Treat victiIIl for shock as required. e. Arrange transportation to a bospital as quickly as possible. f.

If

arms

or legs are affected keep them elevated.

REFERENCE: ll..LINOIS HEART ASSOCIATION

AMERICAN RED CROSS STANDARD FIRST AID AND PERSONAL SAFETY MANUAL (SEC-

ONDEDmON) iii

Table of Contents

SECTION I

DESCRIPTION

INTRODUCTION. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. I-I

EQUIPMENT PURPOSE . . . . . . . . . . . . . . . . . . . . . . . . . . . .. I-I

PHYSICAL DESCRIPTION ........................... H

FUNCTIONAL DESCRIPTION ........................ H

POWER SUPPLY CIRCUITS ...................... , H

DIGffIM FM EXCITER ............................ H

RF

CIRCUITS ....................................

H

SOLID-STATE IPA ............. ' .................. 1-3

PA TUBE ........................................ 1-3

OUTPUT FILTER NETWORK ...................... 1-3

CONTROL, METERING, AND REMOTE CONTROL

CIRCUITRY ..................................... 1-3

PLATE VOLTAGE, PLATE CURRENT, POWER ...... 1-3

FILAMENT VOLTAGE ............................ 1-4

MULTIMETER ................................... 1-4

CONTROLLER PANEL ............................ 1-4

INDICATORS (Signal Row Diagram) ................. 1-4

CONTROLLER FUNCTIONS ....................... 1,5

REMOTE CONTROL. ............................. !-5

OVERLOAD INDICATORS ..... ' ................. ' 1-6

EQUIPMENT CHARACTERISTICS .................... 1-6

ELECTRICAL CHARACTERISTICS ................. 1-6

MECHANICAL CHARACTERISTICS ................ 1-6

TRANSMITTER SHUTDOWN ....................... 3-10

POWER AMPLIFIER NEUTRALIZATION ........... 3-10

PA BYPASS PROCEDURE ........................ 3-12

IPA BYPASS PROCEDURE ....................... 3-12

IPA and PA Bypass Procedure ...................... 3-12

OVERLOAD SET PROCEDURE .................... 3-12

SECTION IV

PRINCTPLES OF OPERATION

INTRODUCTION ................................... 4-1

DIGffIM FM EXCITER ............................... 4-1

INTERMEDIATE POWER AMPLIFIER ................. 4-1

IPA DIRECTIONAL COUPLERlLOW·PASS FILTER ... 4-1

PI NETWORK AND NOTCH FILTER ...... , ..... 4-1

DIRECTIONAL COUPLER. : ................... 4-1

REFLECTED PORT ........................... 4-1

POWER AMPLIFIER (PA) ............................ 4-1

OUTPUT FILTER ................................... 4-1

OUTPUT DIRECTIONAL COUPLER ................... 4-2

POWER SUPPLIES .................................. 4-2

METERING ........................................ 4-2

CONTROLLER ..................................... 4-2

THE POWER SUPPLY ............................. 4-2

THE OPERATING CIRCUITS ....................... 4-3

METERING CIRciJITs ............................ 4-4

OVERLOAD AND ALARM CIRCUITS ............... 4-5

POWER CONTROL CIRCUITS .... ' ................. 4-7 SECTIONll

INSTALLATION

INTROOUcnON ................................... 2-1

UNPACKING .................................... 2-1

RETURNS AND EXCHANGES ..................... 2-1

INSTALLATION ...... _ .......... " ................. 2-1

COOLING AIR REQUIREMENTS .................. , 2-1

TRANSMITTER PLACEMENT .................. : .. 2-1

COMPONENT INSTALLATION .................... 2-1

DIGffIM FM Exciter Installation .............. : ... 2-2

PA TUBE INSTALLATION .................... , 2-2

Installing the Low Pass

On

HT 3.515CD Transmitter. ...................................... 2-2

Installing Output,Filter Components On HT

A C

7/10CD Transmitter ........................... 2-2

In

put

mng ....... _ ........................ ..

2-3

Audio Input Wiring ................................ 2-3

INITIAL CHECKOUT ............................. 2-3

CONNECTIONS TO REMOTE CONTROLS .......... ' 2-3

Exciter Remote Control and Metering ......... . . .. 2-4

EXTERNAL FAIL-SAFE INTERLOCK CONNEC-

TIONS ........... " ............................. 2-4

SECTION V

MAINTENANCE

INTRODUCTION ................................... 5-1

PL"R.POSE ..... ................... ' ................. 5-1

STATION RECORDS ................................ 5-1

TRANSMITTER LOGBOOK ........................ 5-1

MAINTENANCE LOGBOOK ....................... 5-1

SAFETY PRECAUTIONS .......................... 5-1

PREVENTIVE MAINTENANCE ....................... 5-1

FILTER CLEANING ............................... 5-2

BLOWER MAINTENANCE ......................... 5-2

MAINTENANCE OF COMPONENTS ................ 5-2

SEMICONDUCTORS .......................... 5-2

CAFACITORS ................................ 5-2

FIXED RESISTORS ........................... 5-2

VARIABLE RESISTORS ....................... 5-2

TRANSFORMERS ............................. 5-2

METERS ..................................... 5-3

RELAyS ..................................... 5-3

SWITCHES .................................. 5-3

INDICATORS AND INDICATOR SWITCHES ..... 5-3

TUBE ....................................... 5-3

CORRECTIVE MAINTENANCE ....................... 5-3

TROUBLESHOOTING ............................. 5-3

SECTIONID

OPERATION

INTRODUCTION ................ , .................. 3-1

CONTROLS AND INDICATORS ...................... 3-1

PREOPERATIONAL CHECKS ........................ 3-8

TRANSMITTER TURN ON AND CHECKOUT .......... 3-8

AIR INTERLOCK SETUP .......................... 3-8

BIAS ADJUSTMENT .............................. 3-8

MANUAL PWR RAISE & LOWER .................. 3-9

AUTO POWER SET RAISEILOWER SETTING ........ 3-9

Installing 9-Volt Battery ........................... 3-10

Checking Overload Settings ... .. . . . . . . . . . . . . . . . . . . . 3-10

SECTION VI

PARTS LIST

INTRODUCTION ................................... 6-1

REPLACEABLE PARTS SERVICE ..................... 6-1

SECTIONVll

DIAGRAMS

INTRODUCTION ................................... 7-1 iv

888·2386·001

WARNING: Disconnect primary power prior to servicing.

Rev. A: 02·07·96

SECTION I

DESCRIPTION

1.1

INTRODUCTION

This Technical Manual provides information necessary to install, operate, maintain, and service the HT

3.5CD, HT 5CD, or HT 10 CD BROADCAST TRANS-

MITTERS. Sections in this Technical Manual contain the following information:

SECTION I, GENERAL DESCRIPTION, provides a description of equipment features, identifies major components and lists operating parameters and specifications.

SECTION II, INSTALLATION, provides unpacking, inspection and installation information, preoperational checks, and power-on checks to ensure correct operation.

SECTION III, OPERATION, identifies controls and indicators and provides equipment and operational procedures.

SECTION IV, PRINCIPLES OF OPERATIONS, provides a functional description and detailed diagrams with theory of operation.

SECTION V, MAINTENANCE, provides preventive and corrective maintenance information and troubleshooting with instructions for equipment servicing.

SECTION VI, PARTS LIST, provides information for ordering replacement components and assemblies.

SECTION VII, DIAGRAMS, provides block, logic, schematic diagrams, and other drawings required for operation and maintenance.

1.2

EQUIPMENT PURPOSE

The HT 10CD FM BROADCAST TRANSMITTER (refer to Figure 1-1) is a 10,000-watt FM Transmitter (HT

3.5CD is a 3500-watt FM Transmitter, HT 5CD is a

5000-watt FM Transmitter, and HT 7CD is an 8000-watt

FM Transmitter) designed for continuous broadcast operation in the 87.5 to 108 MHz Commercial FM Broadcast Band.

1.3

PHYSICAL DESCRIPTION

The entire unit, including the DIGIT™ FM Exciter,

IPA, PA, associated power supplies, metering, and control circuitry is contained in one cabinet. All required metering is provided by five meters located on the front panel of the transmitter plus an LCD multimeter and an

LED bargraph for percent modultion located on the front face of the DIGIT™ FM Exciter.

The control panel may be lowered to provide access to the control board.

Circuit breakers are accessible on the front panel of the transmitter.

1.4

FUNCTIONAL DESCRIPTION

Refer to Block Diagram of the system (839 6812 066).

1.4.1

POWER SUPPLY CIRCUITS

Five power supplies are used in the FM Transmitter as follows:

PLATE Supply, provides plate voltage to the PA plate circuit.

SCREEN Supply, provides screen voltage to the PA screen circuit.

BIAS Supply, provides fixed bias to the PA grid circuit.

IPA Supply, provides voltage to the Solid-State IPA

Regulator.

CONTROL Supply, provides unregulated voltage to the Controller.

1.4.2

DIGIT™ FM EXCITER

The standard FM Exciter for all HARRIS FM transmitters is the DIGIT™. The DIGIT™ FM Exciter produces a frequency modulated output continuously variable up to 55 watts into a 50-ohm load for any channel assignment within the 87 to 108 MHz Commercial FM Broadcast Band. Servicing is simplified as the DIGIT™ FM

Exciter is modular in concept, with a 3 year warrantee exchange on the individual boards. The front panel metering includes a bargraph modulation meter and LCD display for Forward Power, Reflected Power, PA Volts and PA Amps.

The DIGIT™ exciter requires an input module of which there are two to choose from, the Digital Stereo

Generator Module or the Analog I/O Module.

The Digital Stereo Generator Module is the standard input module and has the following inputs:

1 AES/EBU compatible digital audio input

2 SCA inputs

1 RBDS input

The Analog I/O Module is optional and has the following inputs:

1 Balanced Composite input

1 Unbalanced Composite input

1 Mono input

3 SCA inputs

For more information on the input modules and the

DIGIT™ exciter refer to the DIGIT™ FM Exciter Technical Manual, 988-2356-001.

1.4.3

RF CIRCUITS

The entire rf chain in the FM Transmitter utilizes a

50-ohm interface as follows:

Rev. A: 02-07-96 888-2386-001

WARNING: Disconnect primary power prior to servicing.

1-1

1-2

Figure 1-1. HT 3.5/5/7/10CD FM BROADCAST TRANSMITTER

888-2386-001

WARNING: Disconnect primary power prior to servicing.

Rev. A: 02-07-96

50 ohms DIGIT™ Exciter to IPA.

50 ohms IPA to PA Grid.

50 ohms PA to Antenna Load.

The convenience of 50-ohm interface allows patching around any stage during an emergency fault condition.

For example, should the IPA amplifier fail, the DIGIT™

FM Exciter can be patched directly into the input stage of the PA tube allowing continued on-air operation at a reduced output power. All that is required is the disconnection and then the reconnection of the BNC exciter output to an N to BNC adapter (supplied) on the PA input.

Should the final PA stage fail, the IPA can be patched directly into the antenna, resulting in good local coverage. All that is required is the disconnection of the grid input line from the IPA and the reconnection to the output transmission line.

The FM Transmitter offers excellent RF Bandwidth from the DIGIT™ FM Exciter to the output line to the antenna. Overall bandwidth is 1.8 MHz which essentially provides a transparent amplification chain for the high-performance HARRIS Digital FM Exciter.

Bandwidth is of concern not only for good mono and stereo performance, but also for the current and future uses of SCA services which have been authorized up to 99kHz.

1.4.4

SOLID-STATE IPA

The FM Transmitter utilizes a solid-state IPA. The module is mounted on top of an aluminum heat sink on the blower inlet. The entire IPA, together with its heat sink is easily removed.

The IPA has its own dc supply which is tightly controlled through a solid-state regulator. Both IPA current and voltage are made available for monitoring purposes on the front panel Multimeter. The output of the IPA is routed through a combination Directional Coupler and

Low-Pass Filter. A reflective power sample is derived and routed to the Controller for IPA VSWR overload protection.

1.4.5

PA TUBE

The 4CX3500A tube used in the HT 3.5/5CD Transmitters (4CX7500A in HT 7/10CD)is specifically designed for FM Broadcast Service. The transmitter design only requires the tube to dissipate 56 percent of its rated capability. Low anode dissipation together with thorough air cooling is projected to deliver long tube life.

The tuning and loading controls associated with the

PA tube are as follows:

Input Match.

Input Tune.

PA Load.

PA Tune.

These controls have either counters or position indicators. Tuning is straight forward requiring simple peak and dip procedures.

The Transmitter utilizes a quarter-wave PA circuit. A fixed quarter-wave shorting bar provides coarse PA tuning while a variable air capacitor is used for fine PA tuning. PA loading is accomplished by direct contact from the plate line to the output coaxial line. The output loading is adjustable from the front panel.

The PA grid circuit consists of a series-variable air capacitor which provides the input match control while two shunt-variable inductors provide grid tuning. One inductor offers fixed coarse tuning and the other offers fine grid tuning control.

1.4.6

OUTPUT FILTER NETWORK

The FM Transmitter incorporates a unique output network to reduce signal interference from other rf sources. The Output Filter Network will pass the entire

FM band with rejection to signals outside of the band.

The filter is a distributed coaxial design. This filter covers the entire FM band and requires no field or factory tuning for the given operating frequency. The 2nd harmonic output filter and the cavity loading circuit provide a dc short to the transmission line for lightning protection.

1.4.7

CONTROL, METERING, AND REMOTE

CONTROL CIRCUITRY

The FM Transmitter Controller provides the following functions:

Transmitter On/Off.

Raise/Lower Power.

Automatic VSWR Foldback.

Automatic Power Control.

AC Restart.

Remote Control Interface.

Overload Detection, Protection, and Display.

1.4.8

PLATE VOLTAGE, PLATE CURRENT,

POWER

Large easy to read four-inch meters are used to display PLATE VOLTAGE, PLATE CURRENT, and

POWER (both forward and reflected).

Associated with the output meter is a front panel

POWER selector switch, mounted on the front controller door, which selects the following:

Forward Power.

VSWR.

VSWR Calibrate.

Output Power sample is taken from a Directional

Coupler located at the output of the filter which is the connection to the antenna.

FORWARD Power is a true indication of power being supplied to the antenna system.

Rev. A: 02-07-96 888-2386-001

WARNING: Disconnect primary power prior to servicing.

1-3

VSWR is a ratio reading (example 1.15:1) on the

POWER meter.

VSWR CAL calibrates the VSWR reading. This calibration is set for infinity at the desired output power.

The VSWR CAL setting, because it is a frequent adjustment, is located on the main controller printed-circuit board.

Note that the VSWR CAL must be adjusted to infinity in order for the VSWR reading to be meaningful when the transmitter is operated at reduced power levels.

Plate voltage, plate current, forward power, and

VSWR readings are all available for remote control input. These readings are all positive when referenced to ground.

1.4.9

FILAMENT VOLTAGE

The FILAMENT VOLTS meter is conveniently located on the upper left portion of the front panel. This is a true iron vane AC Voltmeter which displays an accurate reading of PA filament voltage.

Located below the FILAMENT VOLTS meter is the

FILAMENT ADJUST rheostat and the FILAMENT

HOURS Meter.

1.4.10

MULTIMETER

The MULTIMETER is conveniently located at eye level on the upper right-hand corner of the transmitter front panel.

The following nine major parameters are available for selection:

Ig1 (PA Grid Current): 0-300 mA

Eg1 (PA Bias Voltage): 0-1000 volts

Ig2 (PA Screen Current): 0-300 mA

Eg2 (PA Screen Voltage): 0-1000 volts

I IPA (IPA Power Supply Current): 0-30 A

E IPA (IPA Power Supply Voltage): 0-100 volts

OVLD SET: Checks the setting of all overloads in the transmitter. The maintenance engineer operates the MULTIMETER SELECTOR switch to this selection and then runs through the various overload setting with another printed-circuit board mounted selector switch on the controller board.

Position 7 of the OVLD SET selector switch provides metering of IPA reflected power level on an arbitrary

0-100 scale. The position would be selected while tuning the PA cavity INPUT TUNE and INPUT

MATCH controls for a minimum indication.

APC REF: Nominal voltage where automatic power control is set to maintain output power. Refer to the automatic power control section for additional details.

BATT TEST: Checks voltage of the 9-Volt Controller battery which is used for automatic AC Restart. An associated push-to-test pushbutton switch is located

1-4

next to the selector switch which eliminates the possibility of leaving the MULTIMETER in this test position and draining the battery.

NOTE

The 9-Volt battery used is a common variety transistor radio battery (DO NOT USE ALKALINE

BATTERY). The battery has no drain on it nor does it receive a charge. Depending on the freshness of the battery at the time of installation, typical life is expected to be a year plus. The battery, if called upon, should provide three or more days of AC Restart Circuitry power.

1.4.11

CONTROLLER PANEL

The Controller Panel has the following control functions:

MANUAL POWER SET - Raises and lowers PA screen voltage. Nominal full control range is approximately 600 watts to full rated transmitter power watts.

APC (Automatic Power Control) - Activates (ON) or deactivates (OFF) Automatic Power Control.

AUTO POWER SET - After final output power is selected using the MANUAL POWER SET

RAISE/LOWER switch, the auto power window is

“set” by extinguishing the AUTO POWER SET

RAISE and LOWER LED’s with the associated three-position switch. Auto power will maintain output power within +/-5%.

LOCAL/REMOTE - Selects either local or remote command of the transmitter. A red LED is illuminated with the switch in the LOCAL Mode reminding the operator to switch to remote control before leaving the remote site.

OVERLOADS RESET - Clears the overload display on the signal flow diagram and associated overload indicators. The overload display is also accessible from the remote control site.

1.4.12

INDICATORS (Signal Flow Diagram)

INTERLOCKS. Any of these four interlock points will inhibit the filaments and/or the high voltage from coming on.

1. DOOR. LED indicates that the rear door or front panel is open. Prevents high voltage from being applied.

2. AIR. LED indicates that the air switch has not closed, which prevents the filament power being applied to the PA.

NOTE

The AIR LED is illuminated when the transmitter is off. This is a normal condition as it indicates the air switch has not closed.

3. FAULT. Shuts down the transmitter plate voltage when, depending upon which mode is selected, either one overload occurs or three

888-2386-001

WARNING: Disconnect primary power prior to servicing.

Rev. A: 02-07-96

overloads occur within a 60 second period. The fault interlock is automatically cleared when

Plate ON command is given.

4. EXT (External or Failsafe Interlock). Provides an interlock circuit with external pieces of equipment such as water-cooled dummy loads, air-handling systems, combining equipment, etc. When this external contact is opened and the High Voltage is ON, or a Plate ON command is given, the High Voltage will shut down or be prevented from coming up. When this occurs the EXT LED will illuminate. After the external interlock closes, the High Voltage will come back up or may be turned on. After the external interlock closes, the EXT LED is extinguished. There is no memory to this indicator.

This external interlock command interrupts the

High Voltage supply.

NOTE

The external failsafe interlock is a series loop circuit. The external interlock must provide a contact closure between terminals 33 and 34 on terminal board A4TB1 on the Customer Interface/Control

Power Supply PCB assembly (A4).

1.4.13

CONTROLLER FUNCTIONS

FILAMENT ON Command After a FILAMENT ON command, power is applied to the Exciter, Bias Supply, and PA Blower. After the Air Pressure Switch closes, filament voltage is applied to the PA tube. An

18-second filament warm-up timer circuit inhibits high voltage from being applied during this warm-up period. This filament warm-up period is bypassed during momentary (less than 3 seconds) AC Power outages where AC Restart applies plate voltage immediately.

PLATE ON Command A PLATE ON command applies power to the IPA and at the same time stepstarts the plate high voltage supply and the screen voltage supply. The PLATE ON pushbutton switch is also used under emergency operation when the IPA is patched directly into the antenna.

MANUAL POWER SET Raises or lowers a motorized PA screen power supply variac which provides an output power range of a nominal 600 watts to full rated power. For operation at lower power, the exciter output power may be reduced. Manual power set is also adjustable via remote control.

Automatic VSWR Foldback The Controller constantly monitors the reflective voltage sample from the transmitter Directional Coupler. If the reflective sample exceeds the threshold (adjustable), the Controller automatically lowers the PA screen voltage which lowers forward output power and the relative amount of reflective power detected by the Directional Coupler. The Controller continues lowering output power until the reflective voltage sample is below the safe threshold level. The Controller constantly monitors the reflective voltage level. When an antenna icing condition begins to clear, and the load

Rev. A: 02-07-96

begins to return to normal, the Controller automatically increases power to the safest level. The automatic VSWR foldback circuit does not lower the antenna system VSWR, that ratio remains constant.

The circuit merely lowers forward power which in turn simultaneously lowers reflective power to a safe system operating level, thus keeping the station on the air. The APC function must be ON to activate automatic VSWR Foldback.

Automatic Power Control The Automatic Power

Control circuit is similar to the automatic VSWR foldback circuit. After the transmitter has been adjusted for desired output power, the automatic power control “window” must be set. This is accomplished by the AUTO PWR SET RAISE/LOWER switch which is used to extinguish the AUTO POWER RAISE and

LOWER window threshold LED’s. After the “window” is set, the APC control may be engaged which will automatically maintain power to within +/-5%. The

Automatic Power Control may be enabled or disabled from the remote site. The APC circuit, when activated, overrides manual power set. For example, should a front panel or remote raise or lower command be given, the transmitter power will raise or lower. However, at the end of the command, the

APC control will restore power within the set window range. The Automatic Power Control is only overridden by a command from the automatic VSWR foldback circuit which will lower and maintain power at a safe operating level under high-load VSWR conditions. The auto power window may be remotely set.

This requires remote control connections to the momentary Auto Power raise/lower contacts, together with remote status display of the AUTO POWER

SET RAISE/LOWER LED’s.

AC Restart AC Restart automatically returns the transmitter to its previous state (either Filament ON, or HV ON) after an AC Power failure. Should the FM

Transmitter be on the air at the time of the outage and the outage is less than 3 seconds in duration, the plate voltage will be immediately applied, bypassing the 18-second filament warm-up. A longer outage will require an 18-second filament warm-up period. For the HT 7/10CD the filament warm-up is

90 seconds.

NOTE

The preceding only applies if 9 Volt battery backup is in place and of sufficient charge.

1.4.14

REMOTE CONTROL

All connections are made on a large, easily accessible terminal strip located on the upper left-hand portion of the transmitter cabinet (as viewed from the rear).

The following control functions, meter samples, and status indicators are all available for remote control and indication. These commands all require a momentary

888-2386-001

WARNING: Disconnect primary power prior to servicing.

1-5

contact closure between the transmitter supplied +15 volts and the desired command:

Remote Control Commands.

1. FILAMENT ON

2. FILAMENT OFF

3. PLATE ON

4. PLATE OFF

5. MANUAL POWER SET RAISE

6. MANUAL POWER SET LOWER

7. AUTO PWR SET RAISE

8. AUTO PWR SET LOWER

9. APC ON Activate

10.APC OFF Deactivate

11.OVERLOADS RESET

Remote Control Metering Samples.

12.Plate Voltage

13.Plate Current

14.Forward Power

15.Reflective Power (ANT VSWR)

Remote Status Indicators

16.Door Open

17.Air Interlock

18.Fault (Overload)

19.External (Fail-safe)

20.Auto Power Raise

21.Auto Power Lower

22.AFC Overload

23.IPA VSWR Overload

24.IPA Supply Current Overload

25.PA Screen Current Overload

26.PA Plate Current Overload

27.VSWR (ANTENNA)

28.Auto Power Control ON

When activated, these status outputs go

“low”. Remote metering is typically a positive voltage. For some remote control system, a

+15 volt bus is also available.

1.4.15

OVERLOAD INDICATORS

AFC Indicates the Exciter AFC circuit has faulted, prohibiting the transmitter plate voltage from being applied. Note that AFC stands for Automatic Fault

Control when the DIGIT™ exciter is used. It is a general fault with several possible causes within the exciter. For more information refer to the DIGIT™

FM Exciter Technical Manual, Section IV, Theory of

Operation.

IPA (Supply) Indicates an overload on the IPA supply.

IPA VSWR Indicates the IPA has been presented a poor load, either from the IPA Directional Coupler or most likely the PA grid circuit.

PA SCRN (Screen Grid) Indicates a current overload has occurred.

PA PLT (Plate) Indicates dc plate current overload has occurred.

VSWR (Load) Indicates that the load VSWR has exceeded the overload threshold setting.

Two green LED indicators (+/-15V) show that proper control circuitry voltage is present on the printed-circuit board.

1.5

EQUIPMENT CHARACTERISTICS

1.5.1

ELECTRICAL CHARACTERISTICS

Table 1-1 lists the electrical operating characteristics and parameters for the FM Transmitter.

1.5.2

MECHANICAL CHARACTERISTICS

Table 1-2 list the physical and environmental characteristics of the FM Transmitter.

NOTE

Specifications subject to change without notice.

1-6 888-2386-001

WARNING: Disconnect primary power prior to servicing.

Rev. A: 02-07-96

Table 1-1. Electrical Characteristics

FUNCTION

PRIMARY POWER REQUIREMENTS

HT 3.5/5CD

CHARACTERISTIC

HT 7/10CD 3-phase

HT 7/10CD 1-phase

DIGIT™ FM Exciter

197/251 Vac +/-5%, single-phase two-wire, 50 Hz or 60

Hz (as ordered).

WYE - 340-430 Vac, Delta 197-250 Vac +/-5% 3-phase

50 or 60 Hz (as ordered)

197-251Vac +/-5%, 50 Hz or 60 Hz as ordered

100 to 130 Vac or 200 to 260 Vac (as ordered) 50 Hz or

60 Hz, at 1.5 amperes (approximate).

POWER CONSUMPTION

HT 3.5CD

HT 5CD

HT 7CD 3-phase

HT 7CD 1-phase

HT 10CD 3-phase

HT 10CD 1-phase

POWER FACTOR

7 kW (Typical for 3.5 kW output)

10 kW (Typical for 5.0 kW output)

13.5 kW (Typical for 8.0 kW output)

13.5 kW (Typical for 8.0 kW output)

15.7 kW (Typical for 10.0 kW output)

15.7 kW (Typical for 10.0 kW output)

80% for HT 3.5/5CD, 95% for 3-phase HT 7/10CD, 80% for 1-phase HT 7/10CD

FREQUENCY STABILITY

MODULATION CAPABILITY

TYPE OF MODULATION

RF POWER OUTPUT (FCC Notified)

HT 3.5CD

HT 5CD

HT 7CD

HT 10CD

FUNCTION

RF POWER IMPEDANCE

RF FREQUENCY RANGE

MAXIMUM VSWR

HT3/5/5CD

HT7/10CD

RF OUTPUT TERMINATION

RF HARMONIC SUPPRESSION

TUBE USED

+/-300 Hz 0° to 45°C TCXO

+/-200 kHz

Direct Carrier Frequency Modulation (DCFM)

800W - 4000 W

1500W - 5000 W

3000W - 8000 W

5000W - 10000 W

CHARACTERISTIC

50 ohms

87.5 to 108 MHz

2.0 to 1

1.7 to 1

1-5/8 inch EIA flanged HT 3.5/5CD

3-1/8 inch EIA flanged HT 7/10CD

Meets all FCC requirements.

1 - 4CX3500A (PA) (HT 3.5/5CD)

1 - 4CX7500A (PA) (HT 7/10CD)

ASYNCHRONOUS AM Signal to Noise 55 dB below reference Carrier AM Modulation 100% Output Power.

-50 dB Synchronous AM Signal to Noise

FM Noise 80 dB (Wideband Operation).

Refer to the DIGIT™ FM Exciter specifications for additional characteristics.

Rev. A: 02-07-96 888-2386-001

WARNING: Disconnect primary power prior to servicing.

1-7

FUNCTION

Weight (Packed)

Cubage

Size

Operating Temperature Range

Maximum Altitude

Maximum Humidity

Cooling Air Requirements

Air Inlet Size

Air Outlet Size

Table 1-2. Mechanical/Environmental Characteristics

CHARACTERISTIC

Export 1025 pounds (470 kg)

Domestic 925 pounds (420 kg)

46.7 cubic feet (1.322 cubic meters)

Width, 33 inches (84 cm)

Depth, 34 inches (99 cm)

Height, 72 inches (182 cm)

-20°C to +50°C (-4°F to 113°F)

10,000 feet/60 Hz, 7500 feet/50 Hz.

95% noncondensing

400 CFM (11.33 cubic meters/min) nominal (No back pressure)

24.00 inches (60.96 cm) x 24.00 inches (60.96 cm)

22.25 inches (56.52 cm) x 22.25 inches (56.52 cm)

1-8 888-2386-001

WARNING: Disconnect primary power prior to servicing.

Rev. A: 02-07-96

SECTION II

INSTALLATION

2.1

INTRODUCTION

This section contains information for the installation of the low power HT line of FM BROADCAST TRANSMIT-

TER and performing the preoperational checks. Some components are removed from the transmitter after final test for shipment. These components will be identified with appropriate instructions for reinstallation and wiring.

2.1.1

UNPACKING

Carefully unpack the FM Transmitter and perform a visual inspection to determine that no apparent damage was incurred during shipment. Retain the shipping materials until it has been determined that the unit is not damaged.

The contents of the shipment should be as indicated on the packing list. If the contents are incomplete or if the unit is damaged electrically or mechanically, notify the carrier and HARRIS CORPORATION, Broadcast Division.

WARNING

REMOVE ALL PROTECTIVE FILM FROM

FLANGES BEHIND PA TUBE ACCESS

COVER AND THE HIGH VOLTAGE PRO-

TECTION SHIELD PANEL. BOTH ARE LO-

CATED AT THE REAR OF TRANSMITTER.

ALSO REMOVE PROTECTIVE FILM FROM

TOP OUTER EDGE OF HIGH VOLTAGE

PROTECTION SHIELD. THIS FILM IS IN-

STALLED PRIOR TO SHIPMENT TO PRO-

TECT THE GROUNDING SURFACES OF

THE ENCLOSURES FROM ABRADING DUR-

ING SHIPMENT. ALL FILM MUST BE RE-

MOVED FROM THESE SURFACES BEFORE

PUTTING THE TRANSMITTER IN OPERA-

TION.

2.1.2

RETURNS AND EXCHANGES

Damaged or undamaged equipment should not be returned unless written approval and a Return Authorization is received from HARRIS CORPORATION, Broadcast Division. Special shipping instructions and coding will be provided to assure proper handling. Complete details regarding circumstances and reasons for return are to be included in the request for return. Custom equipment or special order equipment is not returnable.

In those instances where return or exchange of equipment is at the request of the customer, or convenience of the customer, a restocking fee will be charged. All returns will be sent freight prepaid and properly insured by the customer. When communicating with HARRIS

CORPORATION, Broadcast Division, specify the HAR-

RIS Order Number or Invoice Number.

2.2

INSTALLATION

Prior to installation, this Technical Manual and the

DIGIT™ FM Exciter Technical Manual should be care-

Rev. A: 02-07-96

fully studied to obtain a thorough understanding of the principles of operation, circuitry and nomenclature. This will facilitate proper installation and initial checkout. The

FM Transmitter installation is accomplished in four steps: (1) transmitter placement, (2) component installation, (3) transmitter wiring, and (4) initial checkout.

2.2.1

COOLING AIR REQUIREMENTS

Harris transmitters are always designed to operate in a free, unobstructed environment with a maximum inlet air temperature of 50°C. This means that the transmitter air system is designed to supply sufficient air at the required static pressure to cool the transmitter only. Any additional pressure loses introduced by air exhaust systems & air supply systems must be satisfied by means other than the transmitter blower. These inlet & exhaust systems generally need to be fan driven.

When installing an exhaust system which removes the warm air from the transmitter room or building, a replacement air system which delivers at least the same volume of air removed is mandatory.

It is considered to be good Engineering practice to allow a relief gap (6 to 10 inches of space) above the exhaust plane at the top of the transmitter in order to minimize the likelihood of introducing undesired restrictions to air flow.

For specific transmitter air requirements refer to the

Transmitter Outline drawing.

2.2.2

TRANSMITTER PLACEMENT

Set the transmitter in place on a level surface near power and signal cables. Either side of the FM Transmitter may be placed against a wall or other equipment.

Complete access is through the front and rear of the transmitter.

The floor must be capable of supporting a load of

120 pounds per-square-foot (58.6 kg per-square-meter)

(refer to Transmitter Outline drawing).

2.2.3

COMPONENT INSTALLATION

The tubes and output transmission line in some cases, are shipped in separate cartons.

The removal of components varies due to the method of shipment. All removed items will be tagged to aid re-installation in the transmitter. Arrange these components in separate groups according to the section from which they were removed. Parts in the interior should be installed first.

Items such as interconnecting wires and cables, shock-mounted devices and miscellaneous small parts may be taped or tied in for shipment. Remove all tape, string, and packing material that has been used for this purpose. Symbol numbers and descriptions are provided on each removed component corresponding to the schematic diagram, parts list, and packing list. Symbol numbers are also stenciled in the cabinet of each removed item. Terminals and wires are tagged with in-

888-2386-001

WARNING: Disconnect primary power prior to servicing.

2-1

formation telling how to reconnect each item. Mounting hardware should be found either in small bags attached to each removed component or inserted in the tapped holes where each component mounts. Reinstall each component in its proper location.

2.2.3.1

DIGIT™ FM Exciter Installation

If it was removed for shipment, install the DIGIT™

FM Exciter Mainframe in the transmitter cabinet. You should have to make the following connections to the back of the exciter: a. Connect the ac power cord b. Connect the 15 pin D connector to J2 c. Connect the RF output coax to J1

2.2.3.2

PA TUBE INSTALLATION

Release the two latches at the top rear of the PA enclosure cover, lift up and remove the cover.

Carefully lower the tube into the tube socket until it rests on the filament fingerstock, using care so that the anode fins do not bind on the teflon air chimney.

Check to be sure the tube contacts line up with the socket fingers. Be sure the filament contact fingers are all in place and are not bent or binding. After being sure that the tube is resting on the contact fingers, carefully push the tube into the socket as far as it will go. Rock the tube slightly to seat it. DO NOT ROTATE THE

TUBE. When the tube is properly seated, the bottom will be resting on four brass hex stop spacers.

Inspect all coaxial cable connectors from the exciter through the IPA to the grid match capacitor of the PA.

2.2.3.3

Installing the Low Pass On HT 3.5/5CD

Transmitter

In the HT 3.5/5CD transmitters, output harmonic levels are controlled by a band-pass filter at the output of the PA cavity. This filter is mounted internally to the cabinet. Connecting the transmitter to the station transmission line is very simple. It only requires bolting the line to the 1-5/8 inch EIA output flange located at the top of the cabinet near the rear edge.

2.2.3.4

Installing Output Filter Components On

HT 7/10CD Transmitter

For the HT 7/10CD transmitter, harmonic attenuation is provided by a second harmonic notch filter, a coaxial low-pass filter, and a tuning stub. All of these elements are externally mounted to the transmitter cabinet (along with the output directional coupler) and are packed and shipped separately. Carefully study Transmitter Outline drawing before proceeding.

a. Installation is accomplished by first locating the

PA output transmission line at the top of the cabinet near the rear. It is an 1-5/8 inch line with an unflanged termination.

b. Next locate the second harmonic notch filter assembly. It is an assembly built in 1-5/8 transmission line about 34 inches long with an adjustable shorting assembly at one end and an unflanged tee at the other end.

c. The side entry to the tee mates with the unflanged line at the top of the transmitter. Carefully

2-2 888-2386-001

WARNING: Disconnect primary power prior to servicing.

lower the side entry port of the tee onto the transmission line that extends through the top of the transmitter cabinet. Be sure that the center conductor bullet mates correctly and does not result in a ‘split bullet’ condition.

d. Secure the serrated outer conductor with the clamp provided.

e. Next locate the low pass filter assembly. It is built in 3-1/8 inch transmission line and has a 1-5/8 inch unflanged connection at one end and at the other end, the output directional coupler which terminates in an EIA 3-1/8 inch flange. It is approximately 72 inches long including the directional coupler.

f. Before attempting installation of the low pass filter, careful consideration must be given to mechanical support of its weight. Hangers or other permanent of means of support must be provided as the output line at the top of the cabinet is not designed to take large side loads as would be the case if the filter were installed without this support.

g. Once the support elements are in place, install the filter by carefully mating the 1-5/8 inch line at the end of the filter with the other port of the tee at the top of the transmitter. Insure that the center conductor bullet does not ‘split’. Secure with the adjustable band provided.

h. Check all bands to ensure they are tight and check the hangers or other support elements to ensure they are carrying the filter weight.

i. Orient the stub parallel to the body of the lowpass filter and secure with the adjustable band provided. Note that the low-pass filter may be rotated at its connection to the tee to place the tuning stub to the top, bottom or sides of the lowpass filter to clear the supporting hardware.

j. Now locate the cable assembly that will connect the directional coupler to the BNC connectors on the top of the cabinet. This cable will have two small coaxial wires with BNC connectors on one end and screw-on connectors on the other.

k. Connect the BNC connectors to J3 and J4 top of the cabinet following the number stamped on each BNC connector.

l. Now carefully remove the protective red shipping caps from the connectors on the directional coupler being careful not to allow the diodes in the connectors to fall out. The diodes are held in place only by the caps or the connectors once they are mated to the coupler.

m. Connect the other ends of the wire to the directional coupler following the color coding on the connectors and on the coupler jacks. Red to red, yellow to yellow.

n. Installation is now complete and the station transmission line may now be connected at the 3-1/8

EIA flange at the output of the directional coupler.

Rev. A: 02-07-96

2.2.4

AC Input Wiring

The ac input for the transmitter should come from low impedance, 50/60 Hz, single or three-phase supply with sufficient capacity to supply the transmitter. A terminal board is installed on the rear left side of the transmitter base for ac power connections. The list that follows gives the circuit breaker or fuse and disconnect recommended for the low power HT transmitter line.

Transmitter Type

HT 3.5CD

HT 5CD

HT 7/10CD 3-phase

HT 7/10CD 1-phase

Circuit Breaker or

Fuse & Disconnect

60 amp

70 amp

70 amp

100 amp

The ac input wiring should be in agreement with local electrical codes and capable of supplying the transmitter power requirements. An ac primary power disconnect or means to completely deenergize the transmitter primary circuit for servicing is necessary. If the program leads must be routed in close proximity to the ac power input wiring, the program leads should be separately shielded.

A good ground at FM frequencies is mandatory to keep stray rf currents to a minimum. RF interference usually shows up in one of two ways, feedback or high noise (in some cases both). Even a small amount of non-shielded wire makes a very efficient antenna for

FM frequencies. If rf from the cabinet field is transferred to the audio equipment, it can be rectified and may show up as noise or feedback. A single common ground point from the transmitter base to a good grounding system, such as a water pipe or actual earth ground is recommended. A grounding stud is located adjacent to the AC Input terminal board.

2.2.5

Audio Input Wiring

The program input wiring may be routed through the holes on the righthand side (either front or rear). All audio, subcarrier, and remote connections will connect directly to the DIGIT™ Exciter input module or to the exciter itself. Be sure to allow enough length on the cables for the exciter to be pulled out of the transmitter on the rack slides. Use ty-raps to dress the cables to keep them away from other transmitter components. Refer to the DIGIT™ FM Exciter Technical Manual Section II,

Installation, for additional exciter wiring information.

Rev. A: 02-07-96

2.2.6

INITIAL CHECKOUT

WARNING

DISCONNECT AND LOCK OUT STATION

PRIMARY POWER TO THE TRANSMITTER.

USE THE GROUNDING HOOK AND DISSI-

PATE ANY RESIDUAL POTENTIAL FROM

ALL COMPONENTS BEFORE TOUCHING

THEM.

Each transmitter is thoroughly checked out during factory final test but adjustment is normally required during installation due to shipping, variations in primary power, antenna systems, or transmission line differences.

A 20k ohm/volt multimeter (Simpson 260 or equivalent) may be required for the checkout.

Before proceeding with the initial FM Transmitter testing, ensure that the DIGIT™ FM Exciter is completely installed, all parts are back in position and correctly wired, PA tube is in the socket, the transmitter is connected to a suitable rf load, and all signal monitors are connected. BNC jacks are located on the input and output sides of the Harmonic Filter. It is recommended that the Modulation Monitor be connected to the output side.

The complete transmitter should be inspected at this time. Use a vacuum cleaner and thoroughly clean the interior of the transmitter. Check the following:

That the primary power is connected to the proper voltage taps but is switched OFF.

That the primary power is connected to the DIGIT™ exciter rear ac plug.

That the audio inputs are connected to the exciter.

That all connections at terminal boards and components are tight.

Remove any extra hardware lying within the cabinet and tighten all nuts and bolts.

Check relay and solenoid armature operation manually. Ensure all have free, unobstructed movement.

That all wires and cabling are dressed properly and secured.

That all ducts and shielding are in place.

Refer to the Factory Test Data Sheets supplied with the transmitter and adjust the controls as indicated. The transmitter was checked into a 50-ohm resistive load at the Factory. Therefore, any system with a mismatch will change the tuning and loading. In this case the recorded control indications may not agree exactly with actual operation.

Set the REMOTE/LOCAL switch to LOCAL.

2.2.7

CONNECTIONS TO REMOTE CONTROLS

The FM Transmitter may be operated by remote control by installing a remote control system. If the transmitter is to be remotely controlled, it is important to initiate thorough inspection and maintenance procedures at

888-2386-001

WARNING: Disconnect primary power prior to servicing.

2-3

the transmitter location. Installation of equipment to monitor temperature and humidity at the remote transmitter site is also recommended. Terminations provided in the FM Transmitter allow remote control of the following transmitter functions by connection to terminal boards A4TB1 and A4TB3 when the REMOTE/LOCAL switch is set to remote. Complete connections shown in

Table 2-1 to terminal board A4TB1 &/or A4TB3.

All control functions must be connected through N.O.

contacts to +15 volts supplied at A4TB1 terminal 6.

Alarms and indicators must be connected through lamps or relays to +15 volts. Lamps, LED’s, and relays should not require more than 10 mA to operate.

2.2.7.1

Exciter Remote Control and Metering

The DIGIT™ Exciter remote control connector is J2, a 15 pin D connector located on the rear of the exciter

(J2 will already have two AFC lines connected to the transmitter and any additional inputs will have to incorporated into the existing connector). If the Digital Stereo

Generator Module is used it has its own 9 pin D connector, J7, which can be used to remotely control the operational mode of the module. Use of these two remote connectors is detailed in the DIGIT™ FM Exciter

Technical Manual in Section II, Installation.

Note

Additional connections to these two remote connectors is not required for normal transmitter operation, and is completely up to the discretion of the customer.

2.2.8

EXTERNAL FAIL-SAFE INTERLOCK

CONNECTIONS

Remove the jumper between terminals 33 and 34 on terminal board A4TB1. Terminal board is located at the lower left rear of the transmitter cabinet.

Connect the remote external fail-safe interlock wiring to the terminals listed in the preceeding paragraph. A set of normally closed contacts are required when the remote control is operational to operate the plate voltage circuit.

Table 2-1. A4TB1 & A4TB3 Remote Control Connections

2-4

+15 Volts

Ip OL (PLATE CURRENT) ALARM

IPA OL (IPA CURRENT) ALARM

Door (INTERLOCK) ALARM

Fault (3-TIME OL) ALARM

POWER RAISE INDICATION

AUTO POWER CTL ON INDICATION

Ep (PLATE VOLTAGE) METERING

Po (POWER OUTPUT) METERING

31

30

AUTO POWER CONTROL ON SWITCH 29

AUTO POWER CTL RAISE SWITCH 28

PLATE VOLTAGE ON SWITCH

FILAMENT VOLTAGE ON SWITCH

MANUAL POWER LOWER SWITCH

27

26

25

3

2

1

32

5

4

6

A4TB1

7

8

9

10

11

12

13

18

19

20

24

14

15

16

17

FAILSAFE INTERLOCK INPUT

FAILSAFE RETURN (GND)

GROUND

GROUND

33

34

1

A4TB3

3

2 4

21

22

23

VSWR OL (LOAD) ALARM

IG2 OL (SCREEN CURRENT) ALARM

AFC (EXCITER) ALARM

Air (BLOWER) ALARM/FILAMENT ON STATUS

EXTERNAL ALARM/PLATE ON STATUS

POWER LOWER INDICATION

Ip (PLATE CURRENT) METERING

VSWR (LOAD) METERING

RESET SWITCH FOR ALARMS

AUTO POWER CONTROL OFF SWITCH

AUTO POWER LOWER SWITCH

PLATE VOLTAGE OFF SWITCH

FILAMENT VOLTAGE OFF SWITCH

MANUAL POWER RAISE SWITCH

EXT IND INPUT

(JUMPER SELECT/CONTROLLER)

REMOTE/LOCAL ALARM (ON for LOCAL)

IPA VSWR ALARM

LOAD VSWR FOLDBACK ALARM

GROUND

GROUND

888-2386-001

WARNING: Disconnect primary power prior to servicing.

Rev. A: 02-07-96

SECTION III

OPERATION

3.1

INTRODUCTION

This section contains operating procedures and information pertaining to identification, location, and function of the controls and indicators on the HT line of FM

Broadcast Transmitters.

3.2

CONTROLS AND INDICATORS

Figures 3-1, 3-2, and 3-3 show the location of all FM

Transmitter controls and indicators. Tables 3-1, 3-2, and 3-3 list all of the controls and indicators with the function of each item listed.

Controls and indicators for the DIGIT™ Exciter are described in the HARRIS DIGIT™ FM Exciter Technical

Manual.

Rev. A: 02-07-96 888-2386-001

WARNING: Disconnect primary power prior to servicing.

3-1

3-2

Figure 3-1. External Controls and Indicators

888-2386-001

WARNING: Disconnect primary power prior to servicing.

Rev. A: 02-07-96

Table 3-1. External Controls and Indicators

13

14

15

6

7

8

9

10

11

12

REF.

CONTROL/INDICATOR

1 FILAMENT VOLTS Meter M4

2

3

4

PLATE VOLTAGE Meter M1

PLATE CURRENT Meter M2

POWER Meter M3

5

16

17

18

19

20

21

FILAMENT ON Pushbutton Switch/Indicator

S1/DS1

FILAMENT OFF Pushbutton Switch S2

PLATE ON Pushbutton

Switch/Indicator S3/DS2

PLATE OFF Pushbutton Switch S4

PLATE TUNE Capacitor

C112

MULTIMETER Meter M5

OUTPUT LOAD

GRID TUNE Inductance

L102

INPUT MATCH Capacitor C107

IPA Circuit Breaker CB5

SCREEN Circuit

Breaker CB2

PLATE Circuit Breaker

CB1

CONTROL Circuit

Breaker CB6

BLOWER Circuit

Breaker CB4

BIAS Circuit Breaker

CB3

FILAMENT HOURS Meter M6

FILAMENT ADJUST

Rheostat R15

FUNCTION

Indicates PA Filament Voltage.

Indicates the PA Plate Voltage.

Indicates the PA Plate Current.

Indicates transmitter RF Output Power or Load VSWR as selected by the

FORWARD/VSWR/VSWR CAL switch on the Controller Panel.

Enables Primary Power and indicates voltage is applied to all circuits, except the IPA, Screen, and Plate Supplies.

Turns off power to entire transmitter.

Enables power and indicates voltage is applied to IPA, Screen, and Plate

Supplies.

Turns off power to IPA, Screen, and Plate Supplies.

Adjusts tuning of the PA Plate Circuit.

Indicates voltage or current selected by MULTIMETER Selector Switch.

Adjusts PA Output Loading to Antenna or RF Load.

Adjusts Grid Tuning to PA.

Adjusts matching of IPA Output to Grid Circuit of PA.

Provides overload protection for IPA Voltage Power Supply.

Provides overload protection for Screen Voltage Power Supply.

Provides overload protection for Plate Voltage Power Supply.

Provides overload protection for Control Power Supply.

Provides overload protection for Blower and Filament transformer.

Provides overload protection for Bias Power Supply.

Indicates accumulated Filament Hours.

Adjusts PA Filament Voltage.

Rev. A: 02-07-96 888-2386-001

WARNING: Disconnect primary power prior to servicing.

3-3

3-4

Figure 3-2. Controller Front Panel

Controls and Indicators

888-2386-001

WARNING: Disconnect primary power prior to servicing.

Rev. A: 02-07-96

Table 3-2. Controller Front Panel

Controls and Indicators

9

10

11

REF.

CONTROL/INDICATOR

1 IPA VSWR OVERLOAD

LED DS16

2

3

DOOR INTERLOCK

LED DS7

POWER FOR-

WARD/VSWR/VSWR

CAL Select Switch S5

4

5

AIR INTERLOCK LED

DS8

FAULT INTERLOCK

LED DS9

6

7

8

12

MULTIMETER SELECT

Switch S3

BATT TEST Pushbutton

Switch S2

EXT INTERLOCK LED

DS10

-15V LED DS2

+15V LED DS1

VSWR (LOAD) OVER-

LOAD LED DS3

AUTO POWER SET

(LOWER) LED DS12

13

14

15

16

17

AUTO POWER SET

(RAISE) LED DS13

AUTO POWER SET

RAISE/LOWER Switch

S9

APC ON LED DS14

VSWR FOLDBACK

LED DS17

LOCAL/REMOTE LED

DS15

18

19

20

21

22

23

24

25

REMOTE/LOCAL

Switch S10

APC ON/OFF Switch S7

OVERLOADS RESET

Pushbutton Switch S6

MANUAL POWER SET

RAISE/LOWER Switch

S8

PA PLATE OVERLOAD

LED DS4

PA SCRN OVERLOAD

LED DS5

IPA SUPPLY OVER-

LOAD LED DS6

AFC OVERLOAD LED

DS11

Rev. A: 02-07-96

FUNCTION

Indicates VSWR Overload of IPA.

Indicates rear Door or Front Panel OPEN Interlock Switch S8A.

Selects Forward Power Output, Load VSWR, and VSWR Cal for display on

POWER Meter M3.

Indicates that Air Switch S5 is OPEN.

Indicates Plate Voltage Recycle has LOCKED OUT.

Selects parameter to be displayed on the MULTIMETER.

When depressed, with the MULTIMETER Selector Switch in the BATT

TEST position, the MULTIMETER will indicate the 9-Volt Battery Voltage.

Indicates External Interlock (Fail-Safe) contacts are OPEN.

Indicates -15 Volt Supply for Controller is ON.

Indicates +15 Volt Supply for Controller is ON.

Indicates VSWR Overload of load (Antenna).

Indicates that the upper limit of Auto Power Window has been reached.

Indicates that the lower limit of Auto Power Window has been reached.

Sets Auto Power Control Window.

Indicates Auto Power Control is ON.

Indicates VSWR Foldback is in effect due to Antenna icing.

Indicates control is in Local Mode when ON.

Switches Control Mode from Local to Remote.

Switches Auto Power Control ON and OFF.

Resets all Overload LED’s to OFF.

Operates PA Screen Variable Transformer T6 to Raise or Lower transmitter power output.

Indicates PA Plate Current Overload.

Indicates PA Screen Current Overload.

Indicates IPA Supply Current Overload.

Indicates Exciter AFC has Faulted.

888-2386-001

WARNING: Disconnect primary power prior to servicing.

3-5

3-6

Figure 3-3. Controller Printed-Circuit Board Controls

888-2386-001

WARNING: Disconnect primary power prior to servicing.

Rev. A: 02-07-96

Table 3-3. Controller Printed-Circuit Board Controls

12

13

14

7

8

9

10

11

4

5

6

REF.

CONTROL/INDICATOR

1

2

3

N/A

Thumb Wheel Switch

Switch S4

9-Volt Battery

Potentiometer R68

Potentiometer R65

Potentiometer R62

Potentiometer R59

Potentiometer R111

Potentiometer R42

Potentiometer R112

Shorting Plug P3

15

16

Shorting Plug P2B

Shorting Plug P2A

Shorting Plug P1

Potentiometer R219

Potentiometer R201

FUNCTION

N/A

Switches to selected parameters to indicate overload setting on MULTIME-

TER M5 when MULTIMETER SELECT Switch is in OVLD position.

For AC Restart, APC Set, and OVLD Hold indication when primary power is lost.

IPA Current OVLD Set Control.

PA Screen OVLD Set Control.

PA Plate Current OVLD Set Control.

Load VSWR OVLD Set Control.

Load VSWR Calibrate Control.

IPA Current Meter Calibrate Control.

POWER Output Meter Calibrate Control.

When in position 1 to 2, Controller will switch Filament On and Plate voltages ON after AC Power failure, if the transmitter was ON at the time of the outage.

Two pushbutton start to switch Transmitter ON.

One pushbutton start (PLATE ON) required to switch Transmitter ON.

Plate ON RECYCLE operation (When in position 1-3 plate will recycle off and then back on until third overload is received but when in position 1-2 plate will cycle off on first overload and will remain off until reset).

IPA VSWR OVLD Set Control.

Antenna VSWR Foldback Set Control.

Rev. A: 02-07-96 888-2386-001

WARNING: Disconnect primary power prior to servicing.

3-7

3.3

PREOPERATIONAL CHECKS

Check that the jumper wire from terminal 33 to terminal 34 on terminal board A4TB4 is connected or that the remote control system’s failsafe contacts have been connected to these terminals as described in paragraph

2.2.7.

Check that the tap connections are correct on FILA-

MENT transformer T4, SCREEN transformer T2, and

PLATE transformer T1 for the station ac line voltage to be used.

Install the rear safety cover and tighten the five 1/4turn fasteners with a screw driver. This cover isolates the terminals that have primary power voltages on them when the back door is removed. This cover is for OP-

ERATOR SAFETY AND IS NOT INTERLOCKED.

Install the rear door. When in place and latched, it opens the plate voltage shorting switch and closes the door interlock switch.

Set the front panel REMOTE/LOCAL switch to the

LOCAL position.

Operate the front panel INPUT MATCH, GRID TUNE,

OUTPUT LOAD, and PLATE TUNE controls to the settings indicated on the Factory Test Data Sheets.

Set the six front panel circuit breakers to the OFF

(down) position.

3.4

TRANSMITTER TURN ON AND

CHECKOUT

The operation procedure is presented under the assumption that the transmitter has been thoroughly and properly aligned and is free of any discrepancies.

Visually inspect the transmitter to ensure that no foreign objects are inside the cabinet, all parts and components are properly installed, all connectors are secure, and all doors and panels are closed.

Activate the STATION AC POWER source to the transmitter.

Set the front panel CONTROL circuit breaker to the

ON (up) position. The +15V, -15V, and LOCAL LED’s should illuminate. Check that the APC is OFF.

Set the BLOWER and BIAS circuit breakers to the

ON (up) position and depress the FILAMENT ON pushbutton switch/indicator (green). The PA blower should come up to speed, the exciter should operate, and the

FILAMENT VOLTS meter should have an indication.

Use the FILAMENT ADJUST control to adjust the filament voltage to full nominal voltage as specified by the applicable tube data sheet in the back of this manual. It is recommended that the first 100 hours of tube life be under this condition. Thereafter start filament management as outlined in the Eimac Engineering newsletter also in the back of this manual.

3.4.1

AIR INTERLOCK SETUP

Use the following procedure if the air interlock switch requires adjustment: a. Deactivate the STATION AC POWER source to the transmitter.

WARNING

DISCONNECT AND LOCK OUT STATION

PRIMARY POWER TO THE TRANSMITTER.

b. Remove the four retaining screws from the front upper hinged access panel and one center screw to open the panel.

WARNING

USE THE GROUNDING HOOK AND DISSI-

PATE ANY RESIDUAL POTENTIAL FROM

ALL COMPONENTS BEFORE TOUCHING

THEM.

c. Rotate adjusting screw (located in center of air switch mounting boss) counterclockwise in 1/4 turn increment.

d. Reinstall the four retaining screws from the front upper hinged access panel and one center screw to close the panel.

e. Reapply power to transmitter and depress the

FILAMENT ON pushbutton switch. If the AIR IN-

TERLOCK LED is now extinguished, the air switch setting is operational. If it is still ON repeat steps a. through e. of this procedure until proper adjustment is obtained.

3.4.2

BIAS ADJUSTMENT

Operate the MULTIMETER SELECT switch to the

EG1 position. The MULTIMETER should indicate within

5% of the value recorded on the Factory Test Data

Sheet. If not, BIAS voltage slide resistor A2R3 will need to be adjusted.

Use the following procedure if the BIAS voltage requires adjustment: a. Deactivate the STATION AC POWER source to the transmitter.

WARNING

DISCONNECT AND LOCK OUT STATION

PRIMARY POWER TO THE TRANSMITTER.

b. Remove the four retaining screws from the front upper hinged access panel and one center screw to open the panel.

3-8

NOTE

If AIR INTERLOCK LED shows ON with the blower running and the transmitter does not operate, the set point of the air interlock switch may need adjustment or there may be some type of obstruction restricting air flow.

888-2386-001

WARNING: Disconnect primary power prior to servicing.

Rev. A: 02-07-96

WARNING

DO NOT OPEN COMPARTMENT WHILE

STATION AC POWER IS APPLIED TO THE

TRANSMITTER, EXTREMELY DANGEROUS

VOLTAGES ARE PRESENT.

f. Check the BIAS voltage and if it still requires adjustment repeat steps a. through e. until the correct voltage is obtained.

3.4.3

MANUAL PWR RAISE & LOWER

This paragraph is to verify the MANUAL PWR RAISE and LOWER circuit is functioning properly. Before turning the transmitter on, visually check the location of the wiper arm on the PA screen variable transformer T6 and note its current location. Lowering the power causes a CCW rotation. Raising the power causes a

CW rotation. Close the access panel and depress the

FILAMENT ON pushbutton. The filament on circuitry will allow only the MANUAL PWR SET LOWER function to operate. Press the MANUAL PWR SET switch to the

LOWER position and hold for approximately 5 seconds.

Turn the transmitter off and open the access panel. The wiper arm of T6 should have rotated in a CCW direction. Note its new location. Close the access panel and depress the FILAMENT ON pushbutton. The MANUAL

RAISE function will not operate unless the plate contactor K6 is activated. To make this check, be sure the screen and plate circuit breakers are in the OFF (down) position. Depress the PLATE ON pushbutton. The plate contactor and the step-start contactor will now be energized. Press the MANUAL PWR SET switch to RAISE and hold for approximately 5 seconds. Turn the transmitter off and open the access panel.

a. The T6 wiper arm should have rotated in a CW direction.

b. Close the panel and replace the retaining screws.

c. Check the DIGIT™ Exciter power output indication on the exciter front panel multimeter. Set the exciter output for the value on the Factory Test

Data Sheets.

d. Set the IPA, SCREEN, and PLATE front panel circuit breakers to the ON (up) position.

e. Depress the PLATE ON pushbutton switch/indicator (green). PLATE VOLTAGE, PLATE CUR-

Rev. A: 02-07-96

WARNING

USE THE GROUNDING HOOK AND DISSI-

PATE ANY RESIDUAL POTENTIAL FROM

ALL COMPONENTS BEFORE TOUCHING

THEM.

c. Adjust BIAS voltage slide resistor A2R3 toward the left to lower bias voltage or to the right to raise bias voltage.

d. Reinstall the four retaining screws from the front upper hinged access panel and one center screw to close the panel.

e. After panel is closed, activate STATION AC

POWER source to the transmitter.

RENT, and POWER meters should have an indication. Adjust the front panel PLATE TUNE and

OUTPUT LOAD controls for maximum power output.

f. Select the OVLD position on the multimeter select switch S3. Select position 7 on the OVLD SET selector switch S4 on the Controller PCB. The

IPA reflected power level is now displayed on multimeter M5. (0-100 scale, not calibrated in watts.) Adjust the PA cavity INPUT MATCH and

INPUT TUNE controls for a minimum indication on M5.

g. Check the VSWR on the transmission line. Operate the control panel FORWARD/VSWR/VSWR

CAL switch to the VSWR position. The power meter should indicate very low VSWR. Operate the switch to VSWR CAL position and check that the

POWER meter is indicating near full scale. Operate the switch to the FORWARD position.

h. If the POWER Meter is not indicating in the

GREEN area at this time, the PLATE TUNE and

OUTPUT LOAD should be adjusted for maximum

POWER OUTPUT with minimum plate current.

NOTE: Because of the mechanical makeup of the loading control, it may be necessary to adjust the loading control several turns in order

to reach a desired peak in power. To obtain

100% POWER OUT, raise or lower the power with the MANUAL PWR SET RAISE/LOWER switch for a 100% reading. Readjust PA tuning and loading following any significant adjustment with the RAISE/LOWER switch.

i. Use the Control Panel MULTIMETER selector switch and compare the MULTIMETER indications for IG1, EG1, IG2, EG2, IIPA, and EIPA against the Factory Test Data Sheets. They should be reasonably close.

Although the transmitter will operate into a 2.0:1 mismatch (with VSWR Foldback disabled and the VSWR trip point appropriately adjusted), it is recommended that the VSWR be kept to a minimum. A 1.1:1 mismatch is considered satisfactory. If a high VSWR is indicated, it is generally traced to transmission line or antenna problems.

Because the transmitter was checked into a 50-ohm resistive load at the Factory, any system with a mismatch will probably change the tuning. Therefore, the

Factory Test Data Sheet control settings and meter readings may not agree with actual operation.

3.4.4

AUTO POWER SET RAISE/LOWER

SETTING

After the transmitter has operated for 30 minutes, the

AUTO POWER SET RAISE/LOWER switch may be set by the following: a. Operate the MULTIMETER Selector switch to the

APC REF position.

b. The AUTO POWER SET LOWER LED (red) should be illuminated. Set the AUTO POWER

SET RAISE/LOWER switch to the RAISE position and hold it until the multimeter reading is equal to

888-2386-001

WARNING: Disconnect primary power prior to servicing.

3-9

that given in the Factory Test Data Sheets. At about this point the AUTO POWER SET LOWER

LED (red) should extinguish. If the point, as given on the Factory Test Data Sheets is passed, the

AUTO POWER SET RAISE LED (red) should illuminate. When this occurs, set the switch to the lower position and hold it there until the AUTO

POWER SET RAISE LED (red) extinguishes, and then release the switch. It is a center OFF switch.

This sets the 5% AUTO POWER Window.

c. Set the APC ON/OFF switch to the ON position.

The APC ON LED (green) should illuminate. This switch also has a center OFF position. The AUTO

POWER circuit is now in operation.

d. Setting the APC ON/OFF switch to the OFF position will turn the AUTO POWER circuit OFF and the APC ON LED (green) should extinguish.

3.4.5

Installing 9-Volt Battery

Lower the Controller panel and install the 9-Volt Battery into the holder on the Controller printed-circuit board. CAUTION - DO NOT USE A 9-VOLT ALKALINE

BATTERY. The battery will accomplish the following: a. Switch the transmitter back ON in case of an ac power failure.

b. Hold the APC REF set.

c. Keep the VSWR Foldback circuit in operation.

d. Maintains a memory for the OVLD LED’s.

If the 9-volt battery used is rechargeable, resistor R8

(820 ohms) should be installed on the terminals provided. See Controller Board schematic (839 7832 019), sheet 3 of 3, area C5 for more information.

3.4.6

Checking Overload Settings

To check the overload settings, operate the MUL-

TIMETER selector switch to the OVLD SET position.

Operate THUMB WHEEL switch S4, located on the control printed-circuit board, as follows and compare the indications to the Factory Test Data Sheets: a. Position 1 reads Load VSWR b. Position 2 reads PA Plate Current c. Position 3 reads PA Screen Current d. Position 4 reads IPA Current e. Position 5 VSWR Foldback f. Position 6 IPA VSWR

Input match control is factory set for minimum reflected to the IPA. This can be read by rotating multimeter to OVLD SET and thumbwheel to position 7.

This control should not require adjustment under normal conditions. GRID TUNE should be set for maximum Ig and minimum reflected.

PA Neutralizing is broad and should not require adjustment.

EG1 PA GRID VOLTAGE will read higher with Plate

Voltage ON than when OFF.

On the HT 3.5/5 there is an 18-second Timer that will inhibit application of Plate Voltage for 18 seconds after

Filament Voltage is applied. This Timer is set for 90 seconds for HT 7/10 transmitters.

When Shorting Plug P2 is in the P2A position, onepushbutton starting is possible. Depressing the PLATE

ON pushbutton switch/indicator will apply power to the

PA Tube FILAMENT and after a time delay (18 seconds for HT 3.5/5, 90 seconds for the HT 7/10) the

PLATE Voltage will be applied.

Shorting Plug P3 must be in the 1 to 2 position for

AC RESTART.

Interlock LED’s will be cleared when interlocks are closed. FAULT LED clears when the PLATE ON pushbutton switch/indicator is depressed.

VSWR FOLDBACK LED (yellow) will illuminate when antenna icing causes power reduction. It will extinguish and power will return to normal automatically when the icing condition is cleared.

When Shorting Plug P1 is in the 1 to 3 position, all

OVLD’s except VSWR will recycle 3 times before PA voltages remain OFF. The FAULT LED will illuminate at this time.

The battery may be tested when the MULTIME-

TER selector switch is in BATT TEST position and adjacent battery test pushbutton switch is depressed.

The OVLD LED’s can be extinguished with the

OVERLOADS RESET pushbutton switch.

3.5

TRANSMITTER SHUTDOWN

To turn the transmitter OFF, first depress the PLATE

OFF pushbutton switch.

The PLATE ON indicator will extinguish and the plate and screen voltage to the PA and the supply voltage to the IPA will be removed. Depress the FILAMENT OFF pushbutton switch. This will switch off the filament, bias, and blower power supply. The Controller power supply remains ON to keep the Controller ready for transmitter start up.

NOTE

The preceding transmitter shutdown procedure should be used if a tube change is to be accomplished immediately after shutdown.

Because a cool-down period is not necessary for the tube used in the FM Transmitter, an alternate method of transmitter shutdown would be to depress ONLY the FILAMENT OFF pushbutton switch. This would switch all circuits OFF except the Controller power supply.

3.5.1

POWER AMPLIFIER NEUTRALIZATION

SPECIAL NOTE

THE PA NEUTRALIZATION IS BROAD AND

SHOULD NOT REQUIRE ANY ADJUSTMENT

UNDER NORMAL OPERATION OR WHEN A

TUBE IS CHANGED.

3-10 888-2386-001

WARNING: Disconnect primary power prior to servicing.

Rev. A: 02-07-96

The following is a list of equipment which may be used for neutralization of the Transmitter:

RF Spectrum Analyzer.

RF Voltmeter.

100 MHz Oscilloscope.

VTVM with RF Probe.

Select one of the listed pieces of test equipment and neutralize the Power Amplifier as follows: a. Using the DIGIT™ exciter front panel controls, lower the exciter power to zero.

b. Remove all ac input power to the transmitter.

WARNING

DISCONNECT AND LOCK OUT PRIMARY

POWER TO THE TRANSMITTER.

c. Open the rear transmitter door and remove the safety shield.

WARNING

USE THE GROUNDING STICK TO TOUCH

ALL COMPONENTS AND TERMINALS TO

DISSIPATE ALL RESIDUAL POTENTIALS

BEFORE TOUCHING THEM WITH THE

HANDS OR TOOLS.

WARNING

USE THE GROUNDING STICK TO TOUCH

ALL COMPONENTS AND TERMINALS TO

DISSIPATE ALL RESIDUAL POTENTIALS

BEFORE TOUCHING THEM WITH THE

HANDS OR TOOLS.

d. Disconnect the RF Input cable to the IPA Module

(type BNC plug). This is the RG-58U cable from the exciter RF Output to the IPA Module.

e. Connect the RF Output cable from the exciter to receptacle J1 on the PA cavity. This is a type N feed-thru jack. Type N to BNC adapter is provided with the transmitter.

f. Remove both PA cavity rear covers including the latched cover and the cover retained with 6-32 screws.

h. Connect the selected rf indicating test device to one of the monitor samples located on the output transmission line.

i. Disconnect the AC Power cord from the exciter

AC Power jack.

j. Connect a standard ac cord into the exciter AC

Power jack. Change AC input select on DIGIT™

Exciter from 220 or 240VAC to 120 VAC by opening AC input cover and turning select cyclinder.

k. Connect the other end of the cord into the 120

Vac power source.

l. Select FWD PWR on the DIGIT™ Exciter multimeter.

m. Using the exciter front panel controls, adjust the exciter power output until the multimeter indicates

5 watts.

n. Select REF PWR on the exciter front panel and adjust the Power Amplifier INPUT MATCH and

GRID TUNE controls for minimum indication on the exciter MULTIMETER.

o. Monitor the rf sampling device,which was connected in a previous step and adjust the power amplifier PLATE TUNE and OUTPUT LOAD controls for maximum indication. Note the indication of the rf coupling device. This will be the zero reference for neutralization.

p. Remove the temporary shorting strap installed in a previous step.

q. Remove any foreign objects or debris from the interior of the transmitter.

r. Replace the rear safety shield, the front access hinged panel, and the covers removed in step f.

s. Adjust the INPUT MATCH and the GRID TUNE controls for minimum REF PWR indication on the exciter multimeter.

t. If the rf indicating device used displays the rf signal down by -30dB or more, with the short removed as compared with the short in place, no adjustment is required.

u. If the signal is not down by -30dB, further adjustment is required. Adjust the PA neutralization flag closer to or farther from the PA tube in one-sixteenth of an inch increments until the -30dB level down is achieved.

v. Repeat steps g. and n. after each movement of the neutralization flag.

WARNING

USE THE GROUNDING STICK TO TOUCH

ALL COMPONENTS AND TERMINALS TO

DISSIPATE ALL RESIDUAL POTENTIALS

BEFORE TOUCHING THEM WITH THE

HANDS OR TOOLS.

g. Short the PA neutralization flag, where it mounts on the ceramic feed-thru insulator, with a short length of copper strap. The copper strap should be 1-inch wide and with enough spring tension to hold it in place. The short must be on the top side of the PA Tube deck.

Rev. A: 02-07-96

NOTE

The latched cover must be installed during all of the neutralization checks.

w. After the completion of the neutralization procedure, connect the Exciter cable to the original position and the PA input rf cable back to the IPA

Directional Coupler. Disconnect the exciter test cord and reconnect the original cable to ac power

888-2386-001

WARNING: Disconnect primary power prior to servicing.

3-11

jack. Change AC input select on DIGIT™ Exciter from 120 VAC to 220 or 240VAC by opening AC input cover and turning select cyclinder.

x. Replace all the panels and covers that were removed. The transmitter should now be ready to resume operation.

y. Turn the transmitter on and select FWD PWR on the exciter front panel. Raise the exciter power output to the value given in the Factory Test Data

Sheets supplied with the transmitter.

3.5.2

PA BYPASS PROCEDURE

ENSURE THAT ALL POWER IS REMOVED

FROM THE TRANSMITTER BEFORE PER-

FORMING THE FOLLOWING STEPS. AL-

WAYS USE A GROUNDING STICK TO EN-

SURE THAT THERE ARE NO RESIDUAL

VOLTAGES PRESENT.

The PA may be bypassed by using the following procedure: a. Disconnect primary power.

b. Remove the transmitter cabinet rear door.

c. Remove the cavity access panel and the cavity rear side wall. (NOTE: One of the screws which secures the side wall is longer than all the others.

Set this screw aside for use in a later step.) d. Disconnect the type N connector end of coaxial cable #213 from J1 on the IPA Directional Coupler/Low Pass Filter.

e. At the pigtailed end of the coax cable #213, remove the 6-32 screw which secures the center conductor to C117. Remove the 6-32 screw which secures the outer shield to the tube socket base.

f. Locate and remove a plug button which closes a hole in the PA tube deck. Route the cable through this hole. Position the cable with the N connector end near J1 of the IPA Directional

Coupler/Low Pass Filter assembly.

g. Remove L106, the upper stationary plate, on which the loading slider moves. This plate is attached to the center conductor of RF output line to the output filter. Use the hardware fastener that held L106 to the RF output center conductor for the next steps.

h. Locate the extra hardware which is stored on a right sidewall fastening screw inside the cavity.

There should be two #6 nuts and two #6 flat washers.

i. Using the long screw from the rear cover (step c.) and one flat washer and one nut (step h.) secure the lugged center conductor of coax cable #213 to the 1-5/8 inch output line center conductor. Using the remaining #6 flat washer and #6 nut, secure the lugged outer shield of coax cable #213

3-12

WARNING

to the cavity side wall. Use the screw where the

#6 hardware was stored.

j. Replace the rear cover and rear access panel on the rear of the PA cavity.

k. Set the PLATE and SCREEN circuit breakers to the OFF positions.

l. Restore primary power and depress PLATE ON pushbutton.

m. The IPA is now connected to the antenna and its output may be increased by increasing the exciter power output and raising the IPA regulator output voltage by advancing control A2R2 clockwise until

50 Vdc is read on the EIPA position of the multimeter or 12 Adc is read on the IIPA position of the same meter. Under no circumstance should either limit be exceeded by increasing A2R2 or raising exciter drive.

n. To restore the transmitter to normal operation reverse the steps in this procedure. Be sure to return the IPA POWER ADJUST control and the exciter output power to normal settings before transmitter operation is attempted.

3.5.3

IPA BYPASS PROCEDURE

WARNING

ENSURE THAT ALL POWER IS REMOVED

FROM THE TRANSMITTER BEFORE PER-

FORMING THE FOLLOWING STEPS. AL-

WAYS USE A GROUNDING STICK TO EN-

SURE THAT THERE ARE NO RESIDUAL

VOLTAGES PRESENT.

Bypass the IPA by completing the following steps: a. Disconnect primary power.

b. Re-route the exciter RF Output cable from the

IPA RF Input, to the type N feedthru jack J1 on the bottom of the PA cavity. A type N to BNC adapter is provided.

c. Restore primary power and depress Plate ON pushbutton.

d. Adjust the DIGIT™ Exciter output to 55 watts.

e. Retune the PA for maximum power output.

f. Adjust the PA screen voltage for maximum power output.

3.5.4

IPA and PA Bypass Procedure

It is possible to put the DIGIT™ exciter directly on the air with the addition of the optional Harris Stand Alone

Transmitter Kit for the DIGIT™ Exciter, Part #994-9506-

001. This includes the Harmonic Filter/RF Sample necessary to use the exciter as a stand alone transmitter.

Instructions are included with the kit.

3.5.5

OVERLOAD SET PROCEDURE

Complete the following steps for the Overload Set

Procedure: a. Operate the MULTIMETER SELECTOR Switch to the OVLD SET position.

888-2386-001

WARNING: Disconnect primary power prior to servicing.

Rev. A: 02-07-96

b. Operate the AUX METER Switch, S4, to the desired circuit to be checked.

c. The MULTIMETER will now indicate a relative reading on the 0 to 100 scale. This indication may now be compared to that recorded in the Factory

Test Data Sheets.

NOTE

Position 7 on the AUX METER Switch S4 is not an overload level set point but rather a relative indication of IPA reflected power. This position can be used to monitor the reflected power from the PA when setting the input match to the PA cavity.

d. The sensitivity may be decreased by adjusting the potentiometer, on the Controller board for the circuit being checked, clockwise and observing an increase in the MULTIMETER indication.

e. The sensitivity may be increased by adjusting the potentiometer, on the Controller board for the circuit being checked, counterclockwise and observing a decrease in the MULTIMETER indication.

Rev. A: 02-07-96 888-2386-001

WARNING: Disconnect primary power prior to servicing.

3-13

 

SECTION IV

PRINCIPLES OF OPERATION

4.1

INTRODUCTION

This section contains circuit descriptions of the HT

3.5/5CD, and HT 7/10CD FM BROADCAST TRANS-

MITTER.

rectified by diode CR1, developing a negative voltage across a resistive voltage divider formed by R5 and R6.

Capacitor C10 removes any remaining rf energy from the sample voltage. This negative sample voltage is then applied to the reflected power amplifier in the Controller.

4.2

DIGIT™ FM EXCITER

Refer to the DIGIT™ Exciter Technical Manual, Section IV.

4.3

INTERMEDIATE POWER AMPLIFIER

The Intermediate Power Amplifier (IPA) is a solidstate amplifier. The DIGIT™ FM exciter output is connected to the IPA input. IPA rf power output is determined by the exciter rf output level and the supply voltage provided by the IPA Regulator A3. This regulated voltage is adjusted by control A2R2 on the Auxiliary board. The IPA output is connected to J1 PA input connector.

4.3.1

IPA DIRECTIONAL COUPLER/LOW-PASS

FILTER

This unit includes a PI network, a 2nd Harmonic

Notch Filter, and a Directional Coupler complete on one printed-circuit board. Refer to schematic 839 5303 001.

CAUTION

WHILE THE CONTROLS FOR THE IPA

LOW-PASS FILTER/DIRECTIONAL COU-

PLER ARE EXPOSED, THEY ARE CALI-

BRATED AT THE FACTORY DURING TEST

AND SHOULD

NEVER

REQUIRE ADDI-

TIONAL ADJUSTMENT.

4.3.1.1

PI NETWORK AND NOTCH FILTER

A PI network is comprised of capacitor C3 (which functions as an IPA tuning control), inductors L2 and

L4, and capacitor C1 (which functions as a loading control). Additional components function as a Notch Filter.

Capacitor C2 provides 2nd Harmonic Notch Filter adjustment.

4.3.1.2

DIRECTIONAL COUPLER

The output circuit includes a Directional Coupler produced in printed-circuit form with microstrip techniques using the principal that adjacent sections of microstrip transmission line share common inductive and capacitive coupling. The Directional Coupler provides a dc signal obtained by rectifying a voltage sample obtained from the transmission line circuitry. Because of the difference in directivity, a sample voltage will be proportional to the reflected traveling wave.

4.3.1.3

REFLECTED PORT

The Reflected Port of the Directional Coupler is terminated by the resistance of R1 and R2 and nulled by the combination of capacitor C12, inductor L7, and variable resistor R2. The rf sample developed by the Reflected

Coupler is then filtered to remove harmonic components. The single section pi filter consists of capacitors

C8, C9, and inductor L5. The filtered rf sample then appears across resistor R4. The filtered sample is then

4.4

POWER AMPLIFIER (PA)

The Power Amplifier of the FM Transmitter is a single tetrode tube in a rf grounded cathode amplifier circuit.

The plate circuit is a shorted, one-quarter wavelength configuration with the plate line operated at dc ground potential. Coarse plate tuning is set by a shorting bar for the operating frequency. The PLATE TUNE control on the front panel, which is a two-plate air-variable capacitor, is used for fine tuning.

The grid circuit also is a shorted one-quarter wavelength configuration. Only a small portion of the grid circuit is outside the tube because of the input capacity of the tube. Coarse tuning is by a semi fixed-short adjustment.

Fine tuning from the front panel is by lead screw driven short.

Input matching, which is adjustable from the front panel, is by an air variable capacitor connected in series with the coaxial line from the IPA.

The filaments, screen, and low-impedance end of the grid circuits are all bypassed with KAPTON. The plate voltage feed-through capacitor also uses KAP-

TON.

Output loading to the antenna is accomplished by an adjustable short between the PA plate line inductance

L105 and the output line L106. Moving the short closer to the PA tube increases loading and moving it farther away from the PA tube decreases loading. The adjustment is very broad. Both L105 and L106 are at dc ground potential.

The HT 7/10 has a 3rd harmonic trap (FL101) consisting of variable capacitor and inductor connected in series to ground from L106. This trap provides approximately 15 dB attenuation of the 3rd harmonic and is factory tuned. The series resonant circuit provides a low impedance path for any 3rd harmonic energy that is present in the output circuit of the amplifier.

Neutralization is accomplished by a basic feed-back circuit from the plate circuit to the input circuit of the amplifier. The feed-back is through a semi-adjustable, two-plate air-variable capacitor. It is not adjustable from the front panel.

4.5

OUTPUT FILTER

Harmonics are attenuated with an Output Filter that passes the carrier frequency but attenuates the carrier harmonics and any spurious signals. Tuned transmission line sections are coupled together in a manner to

Rev. C: 07-10-96 ECN 41259A 888-2386-001

WARNING: Disconnect primary power prior to servicing.

4-1

pass the complete Commercial FM Broadcast Band and give the necessary attenuation to the harmonics to meet FCC requirements.

4.6

OUTPUT DIRECTIONAL COUPLER

The Output Directional Coupler is a short section of transmission line with coupling and rectifying circuit to give a dc voltage to indicate the forward-going power.

The same procedure is used to give a reflected power indication. Both forward and reflected sample voltages are amplified by the control board and then used to drive the output meter.

4.7

POWER SUPPLIES

The control power supply provides unregulated +20 volts and -20 volts to the controller. It uses a centertapped secondary transformer and a standard bridge rectifier with capacity filtering. The controller has regulators to give +15 volts and -15 volts for the controller uses.

The IPA power supply is a single phase full wave rectifier with a capacitance filtering section to provide

50 volts to the regulator. The regulator consists of four series pass transistors connected in parallel and controlled by IC U10. The output of the regulator is variable from 25 to 50 volts at 15 amperes of current.

The Bias Supply consists of a bridge rectifier, transformer, and a choke-capacitor filter. It is adjustable from

-75 to -400 volts. This supply provides a fixed bias to the grid of the PA tube. Additional PA Grid Bias is obtained by grid current flowing through the resistance in the grid circuit.

The Screen Supply consists of a center-tapped, fullwave rectifier circuit using a combination tuned choke and capacitor filtering. The output is adjustable from 0 volts to 800 volts by a variable transformer connected to the primary of the transformer.

The Plate Supply for the HT 3.5/5 uses a full-wave bridge rectifier and a two-section choke-input filter circuit. Taps on both the primary and secondary provide the voltages needed for different PA power output levels.

The Plate Supply for the HT 7/10 is either single phase or three phase (customer specified). Either uses full wave rectification with a choke input filter.

4.8

METERING

Plate voltage is metered by a standard meter multiplier and a 0 to 5000-volt scale meter (or 0 to 10000volt). The meter movement is 1 mA full scale. The multiplier is 5 or 10 megohms.

Plate current is monitored by a 0 to 2 (or 0 to 3) ampere meter in the negative return of the Plate Voltage Power Supply.

Power output is monitored by a 200 uA meter with a scale in percent power and a VSWR scale. The meter is driven from the control board which receives its input from Directional Coupler DC1 located at the output of the Filter.

4-2

The filament voltmeter is an iron-vane movement meter. Filament voltage is measured at the output of filament transformer T4.

A multimeter is located on the front panel of the transmitter. The following indications may be selected by a selector switch on the controller panel:

PA GRID CURRENT

IPA VOLTAGE

PA GRID VOLTAGE

OVERLOAD SET REFERENCE

PA SCREEN CURRENT

APC REFERENCE

PA SCREEN VOLTAGE

BATTERY TEST

IPA CURRENT

4.9

CONTROLLER

The FM Transmitter Controller system consists of the components on the Control printed-circuit board, the

Dual 20-Volt Power Supply, and Solid-State Relays

(SSR’s) in the main cabinet. The circuitry is in five logically independent sections which will be discussed separately. The sections are, 1) the Power Supply, 2) the Operating circuits, 3) the Metering circuits 4) Overload and Alarm circuits, and 5) Power Control circuits.

Portions of each of these groups are involved with the

AC Restart facility, which is dependent on the presence of a 9-volt battery.

4.9.1

THE POWER SUPPLY

(Refer to schematic 843 4979 024)

The Controller circuits are powered with a dual regulator system. This system begins with a dual 20-volt

Power Supply in the main cabinet. The + and -20-volt lines are carried to the Controller through the ribbon cable which terminates at receptacle J2 on the Controller printed-circuit board. The negative side (- 20-volt line) is regulated by integrated circuit U2 to -15 volts. Frontpanel -15V LED DS2 (Grn) indicates the presence of this voltage.

The positive side of the cabinet power supply (+ 20volt line) is regulated by integrated circuit U1 to +15 volts. This voltage is made available via diode CR6 to the main cabinet for the Solid-State Relays, via receptacle J2, and to the remote control circuits, via resistor R2 and receptacle J1. Front-panel +15V LED DS1 (Grn) indicates the presence of this voltage.

In addition, the +15-volt circuit is connected thru diode CR3 to a circuit called +15B. This circuit is supported during a power failure by 9-volt battery BT1, via diode CR4, thus maintaining the status of the transmitter.

Optional resistor R8 provides a charging circuit for the battery. This resistor should be removed if the use of non-rechargeable batteries is preferred. Battery test pushbutton switch S2 connects the battery to the meter

888-2386-001 Rev. C: 07-10-96 ECN 41259A

WARNING: Disconnect primary power prior to servicing.

circuit only while the pushbutton is depressed. This prevents the accidental discharging of a non-rechargeable battery by the meter circuit.

During a power failure, both the +15 and -15 volt circuits are inoperative, but the +15B circuit is maintained at about the 9-volt level if the battery is new. As the battery is used, this voltage decreases. The circuit will continue to remember transmitter status with this voltage as low as approximately 5 volts, allowing correct

AC Restart operation after power outages for a period as long as 72 hours.

Several of the integrated circuits used in the Controller are capable of having their output circuits placed in a high-impedance state (referred to as tri-state). This capability permits the separation of circuits which remain active during a power failure from those which are allowed to become inactive. The switching to or from this tri-state condition is controlled by integrated circuit

U17E. The input of this integrated circuit is connected to the portion of the Power Supply (+15) which becomes inactive during a power failure through a Zener diode. The action of this circuit is such that a reduction in the +15-volt supply below about 7 volts causes the output of integrated circuit U17E to go to the “HIGH”

(logic 1) state. This causes most of the tri-state devices to switch their outputs to the high-impedance state.

The result of this is that devices which are not connected to the +15B circuit will not consume battery power from those devices which are operating from battery power. Integrated circuit U17D provides the complement of the “state-control” circuit for those devices which need a “LOW” (logic 0) during power failure.

4.9.2

THE OPERATING CIRCUITS

(Refer to schematic 839 7832 019)

Control of the Operating Circuits is by way of either

Front Panel pushbutton switches or Remote Control circuits. In either case, the requirement for an “ON” condition is a voltage in the range of 12 to 15 volts. Remote

Control circuits may be powered from either the local power supply or an external supply with its negative connected to the transmitter ground circuit. Remote

Control inputs are enabled or disabled by the RE-

MOTE/LOCAL switch located on the Controller front panel. Note that all remote control command input lines and status output lines are isolated through opto-couplers. This provides noise and transient immunity for the Controller. When the REMOTE/LOCAL switch is in the LOCAL position, front panel LOCAL LED DS15

(red) is illuminated and a shunt circuit exists for all of the Remote Control inputs, preventing them from having any influence on the transmitter control circuits.

When the REMOTE/LOCAL switch is not in the LOCAL position, the shunt circuits do not exist and the Remote

Control inputs have exactly the same functions as the transmitter front panel pushbutton switches.

The main transmitter control circuits consist of integrated circuits U19, U25, U32, and portions of integrated circuits U8, U15, and U17. Integrated circuit U32 is a dual four-input NAND gate package. The “B” half of integrated circuit U32 is applied in the Filament circuit.

The “A” half of integrated circuit U32 serves a similar purpose in the Plate circuit. Similarly, integrated circuit

U25 is a dual package “D”-type flip-flop. One-half is the

Filament Memory circuit, the other half is the Plate

Memory circuit.

The Filament circuit is activated by either of two methods, depending on whether the transmitter is to be operated in the One-Button Start mode or the Two-Button Start mode. The Two-Button Start mode (which always operates) will be described first.

Two of the inputs to integrated circuit U32B are connected to the +15 volt circuit and the fourth (pin 1) is held at the +15-volt level by resistor R204 (unless the

FIL OFF pushbutton switch is depressed). When the

FIL ON circuit is closed (by completing a path from

+15-volts to integrated circuit U32B-2), the output of integrated circuit U32B goes to the “LOW” state. This output is connected to two circuits. One of these, integrated circuit U15H, inverts the “LOW” input to a

“HIGH” output and passes it to the main cabinet thru receptacle J2 where it connects to the Filament SSR

(Solid-State Relay).

If the blower circuit breaker is closed, the blower starts. When the air pressure builds up and the Air

Switch closes, the Filament circuit is activated and Filament voltage is applied to the tube.

The other output of integrated circuit U32B is connected to integrated circuit U15A, which inverts the

“LOW” to a “HIGH” and applies it to integrated circuit

U32A, as a gate input which indicates that the Filament circuit has been activated, and to the C1 input of integrated circuit U25B, which is the Filament Memory circuit. The D input to integrated circuit U25B is connected

“HIGH” and neither the “R-not” nor “S-not” inputs are active, so the action of changing the Cl input from a

“LOW” to a “HIGH” causes the flip-flop to “clock” to the

“ON” or “SET” state. In this state, the “Q” output goes

“HIGH” and is connected through buffer integrated circuit U8F and diode CR20 to pin 2 of integrated circuit

U32B, which maintains or reinforces the original action of depressing the FIL ON pushbutton switch. The Filament circuit is now stable, and the FIL ON pushbutton switch may be released. The Filament Memory circuit remembers that the Filament circuit should be “ON”.

The FIL OFF pushbutton switch completes a circuit between the +15-volt supply and pin 15 of integrated circuit U15G. When this pushbutton switch is depressed, the “HIGH” applied to integrated circuit U15G is inverted and connected to the “R-not” input of integrated circuit U25B, causing it to go to its “OFF” or

“RESET” state. The “LOW” from integrated circuit U15G is also connected through diode CR70 to pin 1 of integrated circuit U32B, causing its output to go to the

“HIGH” state. When integrated circuit U25B resets, its

“Q” output goes “LOW”, removing the “HIGH” that had been applied to pin 1 of integrated circuit U32B through integrated circuit U8F and diode CR20. The Filament

Memory circuit now remembers that the Filament circuit is “OFF”. The “Q-not” output of integrated circuit U25B is applied to integrated circuit U19 through integrated circuit U8A and diode CR21. When the Filament circuit is started, the “LOW” to pin 6 of integrated circuit U19 causes it to switch its output (pin 8) from “HIGH” to

Rev. C: 07-10-96 ECN 41259A 888-2386-001

WARNING: Disconnect primary power prior to servicing.

4-3

“LOW” for a period of time determined by the components (capacitor C44, resistor R104, and resistor R105) associated with integrated circuit U19. During the time integrated circuit U19 is “timing”, pin 9 of integrated circuit U32A is held “LOW” and the Plate circuit cannot be turned ON. When integrated circuit U19 “times-out” after having allowed sufficient time for the tube filament to warm up, its output again goes “HIGH”, enabling (but not necessarily activating) the Plate Circuit. The other device connected to pin 6 of integrated circuit U19 is integrated circuit U17A.

The purpose of this circuit is to force the timer to operate when power returns after a power failure, keeping the Plate circuit inactive during the filament warm-up time in the event AC Restart is active. The components at the input of integrated circuit U17A are intended to force this timing action only if the power has been off long enough to demand reheating of the filament. If power is off only briefly, capacitor C46 will not have discharged sufficiently to cause the output of integrated circuit U17A to go to the “HIGH” state. In this case, the return of power will allow the Plate circuit to operate immediately. However, on initial start up, or when the power has been off long enough, capacitor C46 will be discharged and the “LOW” that it presents to integrated circuit U17A is inverted to a “HIGH” to insure that integrated circuit U19 will be reset, forcing the full Filament timing interval.

The Plate Circuit, as is the case with the Filament circuit, may be activated by either of two methods, depending on the position of jumper plug P2. When this plug is in the P2B position, the Plate circuit operates in the Two-Button Start mode and the PLATE ON pushbutton switch has no effect on the Filament circuit.

When the plug is in the P2A position, the One-Button

Start mode is active and depressing the PLATE ON pushbutton switch will activate both the Filament and

Plate circuits by forcing both the Filament and Plate

Memory circuits to the “SET” state.

When jumper plug P2 is in the P2B position (Two-

Button Start mode), completing the PLATE ON circuit applies a “HIGH” to pin 12 of integrated circuit U32A via diode CR19 and position P2B. If the Filament circuit has been on long enough for integrated circuit U19 to have timed-out, both pins 9 and 13, on integrated circuit

U32A, will be “HIGH”. Pin 10 of integrated circuit U32A will also be “HIGH” if the PLATE OFF pushbutton switch is not depressed. With all of these conditions existing, the output of integrated circuit U32A goes

“LOW”.

If there is no fault or interlock condition existing, the inputs to integrated circuits U15D and U15E go “LOW”.

The output of integrated circuit U15D goes “HIGH” and activates the Step-Start sequence in the main cabinet, via the Plate SSR. The output of integrated circuit U15E

“clocks” Plate Memory integrated circuit U25A, causing it to go to the “ON” or “SET” condition. Its output, through integrated circuit U8E and diode CR18, holds pin 12 on integrated circuit U32A “HIGH” even after the

PLATE ON pushbutton switch is released.

With Jumper Plug P2 in the P2A position, depressing the PLATE ON pushbutton switch will apply a “LOW” to

4-4

the “S-not” inputs of both the Filament and Plate Memory circuits (integrated circuits U25B and U25A), causing them to go to their “SET” or “ON” states. As a result, the transmitter will come up to the “on-air” mode as soon as Filament timer integrated circuit U19 has completed its timing cycle if there are no fault or interlock conditions existing.

If either the PLATE OFF pushbutton switch or the FIL

OFF pushbutton switch is depressed, or if any of a number of fault or interlock conditions exists, the input to integrated circuit U15C will be “HIGH”. This is inverted to a “LOW” and applied to both pin 10 on integrated circuit U32A, via diode CR69, and to the “R-not” input of integrated circuit U25A, causing it to be reset.

The external conditions which can cause this unconditional turning OFF of the Plate circuit include an open cabinet door, an excessive transmission line VSWR, or an overload which has satisfied the 1-time/3-time circuit

(to be described later).

Because the output of integrated circuit U32A is connected to integrated circuits U15D and U15E through diode CR17, it is possible to deactivate the cabinet

Step-Start circuit by connecting a “HIGH” to integrated circuits U15D and U15E through the Plate Inhibit circuit.

This method of inhibiting the Plate circuit is momentary, as it does not turn OFF Plate Memory flip-flop integrated circuit U25A. The external conditions which can cause this momentary turning OFF of the Plate circuit, include an overload which has not yet satisfied the 1time/3-time circuit, an existing IPA VSWR in excess of the allowable amount, or a DIGIT™ Exciter Fault condition. The Exciter fault circuit is inhibited if the Filament is OFF or if it is ON but filament timer integrated circuit

U19 is still timing. This is done through the “OR” function of diodes CR81 and CR82. Similarly, if the AIR

Switch is open, the “HIGH” at the input of integrated circuit U13H is passed through diode CR84 to the Plate

Inhibit circuit holding the plate OFF if there is no air flow.

If the 9-volt battery is good, the Filament portion of the AC Restart circuit always works but the Plate circuit may be operated either in the Full (automatic) mode or the Filament Only mode, as a function of the position of jumper plug P3. If the plug is in the 1-2 position, the full

AC Restart capability operates. If the plug is in the 1-3 position, loss of the +15-volt power input will apply a

“LOW” to the “R-not” input of integrated circuit U25A via resistor R69. This causes integrated circuit U25A to turn OFF, and the result is that a new PLATE ON command will be required after restoration of power, as only the Filament Memory integrated circuit U25B may be left ON.

All of the integrated circuits discussed in this section

(integrated circuits U8, U15, U17, U19, U25, and U32) are powered from the +15B power source, although certain device inputs are connected to the +15-volt power source.

4.9.3

METERING CIRCUITS

(Refer to schematic 839 7832 019)

The transmitter Power Amplifier Plate Voltage meter and the Power Amplifier Plate Current meter are driven

888-2386-001 Rev. C: 07-10-96 ECN 41259A

WARNING: Disconnect primary power prior to servicing.

in the traditional manner, without the use of any of the circuitry on the Controller printed-circuit board. The remote control samples for these two measurements and all of the other meter readings are provided by circuits on the Controller printed-circuit board.

Some of the sample voltages are negative, and are inverted for display on the Power meter and Multimeter, and for remote control use. The circuits for the Power

Amplifier Grid 1 voltage and current samples, and the

Grid 2 current sample are typical of those that are inverted. These samples, derived from circuitry in the main cabinet and connected to the Control board via receptacle J2, are inverted by being connected to the inverting inputs of integrated circuits U16A, U5C, and

U16C. The ratio of resistors R23 and R22 set the gain of integrated circuit U16A at about -0.5, and the gain of integrated circuit U5C is about -7, as determined by the ratio of resistors R17 and R16. Integrated circuit U16C has a gain of about -3.3, as set by resistors R45 and

R44. Capacitor C19, which parallels resistor R45 on integrated circuit U16C, slows down the response of the circuit so that it does not respond to very short duration changes.

The Grid 2 voltage sample is handled by integrated circuit U5D which is connected as a voltage follower.

Resistor R19 provides protection for the integrated circuit in the event of a fault in the divider circuit which provides the sample voltage. The IPA current sample is processed by integrated circuit U16D as a differential input, because the sample itself may have an offset

(common mode error) from ground. The circuit has a gain of about 10, determined in part by the setting of

IPA current meter calibration control resistor R42. This control is needed because the value of the current sample shunt resistor in the main cabinet is somewhat difficult to predict accurately. The IPA voltage sample circuit has a gain of about .33 through voltage follower integrated circuit U5B. All of the sample voltages discussed above are available to front panel MULTIME-

TER selector switch S3.

In addition to these, the MULTIMETER selector switch also may select the battery test circuit, the Automatic Power Control (APC) level reference voltage, or

Secondary Meter Selector switch S4 (part of the Overload and Alarm circuits to be discussed later). The output of MULTIMETER selector switch S3 is connected to the MULTIMETER through voltage follower integrated circuit U11B. Resistor R56 (9.1k ohm) is the meter multiplier, providing full-scale deflection current of 1 mA with an integrated circuit output of 10 volts.

The circuits comprised of integrated circuits U5A and

U16B and their associated components, provide positive voltage samples from the Power Amplifier Plate

Voltage and Plate Current circuits for remote control use.

Integrated circuit U5A is a voltage follower (gain of 1) and integrated circuit U16B is an inverter (gain of about

-1).

The IPA Reflected Power sample, from the coupler in the filter between the IPA and the Power Amplifier Grid

1, is amplified by integrated circuit U26A (gain of about

Rev. C: 07-10-96 ECN 41259A 888-2386-001

WARNING: Disconnect primary power prior to servicing.

-10) for the Overload and Alarm circuit (to be described later).

The Transmission Line coupler samples (Forward

Power and Reflected Power) are amplified and inverted by integrated circuits U26B, U26D, and U26C. The extra integrated circuit section in the Reflected Power circuit reduces the offset errors of the circuit which normally handles relatively small voltages. The outputs of these circuits are made available for the remote control equipment and are connected to the front-panel meter of the transmitter by way of the Controller front panel three-position POWER meter selector switch S5.

In the FORWARD position, this switch connects the output of integrated circuit U26B to the meter through resistor R112, which calibrates the meter for the normal operating power of the transmitter. In the Calibrate position, the meter is connected to the same amplifier through Load VSWR Calibrate potentiometer R111, which may be adjusted to produce a full-scale indication on the meter for the power at which the transmitter is operating.

When the switch is operated to the VSWR position, the meter is connected to the Reflected Power circuit

(integrated circuit U26C) through Load VSWR Calibrate potentiometer R111, producing a meter deflection which is read on the VSWR scale of the meter. If actual Reflected Power in watts is to be read, Load VSWR Calibrate potentiometer R111 must be adjusted until the meter in the Calibrate position reads infinity. After this adjustment, the meter switch may be set to the VSWR position and the Reflected Power read from the Power scale of the meter.

Several of the meter amplifier outputs are connected to the Overload and Alarm circuits. These are: Grid 2 current, IPA current, Plate current, IPA Reflected

Power, and PA (Transmission Line) Reflected Power.

PA Forward Power is connected to the Automatic

Power Control circuit.

4.9.4

OVERLOAD AND ALARM CIRCUITS

(Refer to schematic 839 7832 019)

The Overload and Alarm circuits consist principally of several comparators, a set of latches (to operate the overload indicators), two timing circuits, and a counter.

Associated with these are the Interlock circuits.

The Comparators are divided into two groups. PA

Grid 2 current, IPA current, PA Plate current, IPA Reflected Power, and Exciter Fault (which is treated as an overload) all operate through the counter and timer circuits. The PA (transmission line) Reflected Power overload circuit is connected directly to the Plate Off circuit.

The counter and timer circuits may be operated in either a 1-time or a 3-time mode. This choice is made by the position of jumper plug P1. If this plug is in the

1-time position (1 to 2), all of the overloads in the first group operate like the PA Reflected Power overload

(the Plate is turned off). If plug P1 is in the 3-time position (1 to 3), the overloads in the first group are allowed a total of three overloads (from all five overload inputs) within a period of about 30 seconds. If there are less

4-5

that 3 overloads within this period, the timer resets the counter, and the Plate is not turned off.

Overload comparators integrated circuits U10A thru

U10D and U11D, provide a logic 1 “HIGH” output whenever the sample input from the meter amplifier is more positive than the reference input for that circuit. In the case of the Grid 2 current the meter amplifier sample is applied to the noninverting (+) input of integrated circuit

U10C through resistor R9. The reference voltage is applied to the inverting (-) input and is set by PA Screen

OVLD Set potentiometer R65 which is the Grid 2

(Screen) overload adjust control. This reference voltage is also fed to the Thumbwheel switch (Secondary Meter

Selector Switch) S4, so that the overload set point may be viewed on the same meter (and on the same scale) as the Grid 2 current itself. In this way, the overload setting may be read in the same units as the current being monitored.

Integrated circuit U10C has an open collector output.

This means that the integrated circuit is capable of pulling its output to the logic 0 “LOW” but cannot pull it to the “HIGH” state. Resistor R69 is connected to the +15volt supply for this purpose. Resistor R180 is connected from the output of integrated circuit U10C to its noninverting input to create a small amount of hysteresis.

This prevents the circuit from being unstable when its two inputs are nearly the same voltage.

Similarly integrated circuits U10D, U10B and U10A provide a comparison function for IPA current, Plate current, and PA Reflected Power. Integrated circuit

U11D is an op-amp rather than a comparator, and may drive its output either to the “HIGH” state or to the negative (-15) supply voltage. Because of this, no pullup resistor is required, but diode CR71 is required to prevent driving the following circuit negative.

The Exciter Fault input is normally a logic “LOW”

(through the Exciter circuit to ground). If the Exciter has a Fault and the Filament and Filament Timer have both reached the “ON” state, resistor R119 provides a logic

“HIGH” at the input to integrated circuit U6B. This circuit and integrated circuit U4C invert the logic level twice.

The output of integrated circuit U4C is connected to the

Plate Inhibit circuit through diode CR23, causing the

Plate to be OFF for the duration of the Fault condition, and to the clock input of latch integrated circuit U12B, causing it to go to the “SET” condition. This circuit is a contact de-bounce circuit, because it goes “SET” on the first action of the Exciter Fault circuit, and additional operations of the Exciter Fault circuit during the Fault interval are ignored. The “Q” output of integrated circuit

U12B is then considered to be the Fault input for all subsequent circuits. The output of each of the comparators and Fault de-bounce latch integrated circuit U12B are connected to the clock inputs of a set of status latches, integrated circuits U9A and U9B, U14B and

U14A, U22A and U12A. These latches remember that there has been activity in the preceding circuitry (an overload or an exciter fault). The output of each of these latches is connected to an inverter which in turn provides current for a LED. These LED’s are on the front panel of the Controller and are marked to identify the overload which caused them to be illuminated. The

4-6

LED drivers also provide output for Remote Control equipment. The latches may be reset from the front panel with the RESET switch or from the remote control input.

The Grid 2 current, IPA current, Plate current, and

IPA Reflected Power circuits are connected to the Recycle circuit through diodes CR13, CR14, CR12, and

CR72 respectively. The common cathode of these diodes is connected through integrated circuits U17B and

U17C to the clock input of latch integrated circuit U7A.

When any of the four actions occurs (an overload), this latch is “SET” and as a result three things happen.

First, the “Q” output of integrated circuit U7A is connected through buffer integrated circuit U8G and diode

CR15 to the Plate Inhibit circuit, turning the Plate OFF.

Second, the output of integrated circuit U8G is connected to the 1-time/3-time counter, causing it to add one to its count. Third, the “Q-not” output of integrated circuit U7A is connected through buffer integrated circuit U8B to timer integrated circuit U18. Integrated circuit U18 now begins its timing (about one-half second) at the end of which its output goes to the “LOW” state.

When this happens, Fault debounce latch integrated circuit U12B and Recycle latch integrated circuit U7A are reset. The “Q” output of integrated circuit U7A goes

“LOW”, allowing the Plate to come ON (unless the 1time/3-time counter has reached its limit) and the “Qnot” output of integrated circuit U7A goes “HIGH”, returning integrated circuit U18 to its idle state (its output goes “HIGH”).

This recycle action occurs each time that there is an overload as long as the counter has not reached its limit and turned the Plate OFF.

The counter consists of integrated circuit U24. The count timer is integrated circuit U23. Integrated circuit

U24 is connected as a simple accumulator, each new input pulse causes the next section of the flip-flop

(latch) to be turned ON (go to the SET state). Initially, all sections of integrated circuit U24 are reset and integrated circuit U23 is idle, with its output in the “HIGH” state. When a recycle action occurs, the clock input of all sections of integrated circuit U24 go to the “HIGH” state. The D input of integrated circuit U24A is always

“HIGH” so that this section goes to the “SET” state. If

Jumper plug P1 is in the 1-time position, the D input of integrated circuit U24C is also “HIGH” and will go “SET” on the first recycle action.

If Jumper plug P1 is in the 3-time position, the first recycle causes only integrated circuit U24A to go

“SET”. At this time, its “Q” output goes “HIGH” and presets the D input of integrated circuit U24B. The “Q-not” output of integrated circuit U24A goes “LOW” and timer integrated circuit U23 begins its cycle. If there are not enough counts to cause the counter to reach its limit before the timer runs out, the “LOW” from the output of integrated circuit U23 will reset all sections of integrated circuit U24 and the count action may begin again on the next overload.

If the counter has reached its limit, integrated circuit

U24 will go to the “SET” condition and its “Q” output will go to the “HIGH” state. Two things now occur. First, diode CR8 prevents the reset of integrated circuit U24

888-2386-001 Rev. C: 07-10-96 ECN 41259A

WARNING: Disconnect primary power prior to servicing.

when the timer (integrated circuit U23) runs out. Second, diode CR16 turns OFF the Plate circuit. The next operation of the PLATE ON circuit, either local or remote (if enabled) will reset integrated circuit U24.

A PA Reflected Power overload, as determined by integrated circuit U10A, will turn OFF the Plate circuit through diode CR11. An open door will also result in a

PLATE OFF command (through diode CR10), and as the OFF circuit has priority over the ON circuit, the

Plate circuit cannot be turned on nor can the Plate

Memory be set while the door is open.

4.9.5

POWER CONTROL CIRCUITS

(Refer to schematic 839 7832 019)

The Power Control Circuits may be divided into several logical groups. The first of these is the Manual

Power Control. Local and Remote operation of the

Manual Raise and Manual Lower circuits is inverted by integrated circuits U6D and U6G which are connected to Solid-State Relays in the Main Transmitter Cabinet.

These relays control the motor which positions the variable auto transformer in the PA Screen Power Supply.

Diode CR30 is connected in such a way that a Lower command always has preference over a Raise command, regardless of whether the command is generated locally, remotely, or by the Automatic Power Control

(APC).

The second logical circuit to be considered is the

APC Level generator. This circuit uses digital techniques to derive an analog voltage which serves as the

APC reference level. The heart of the circuit is an eightbit counter consisting of integrated circuit U27 (lower four bits) and integrated circuit U21 (upper four bits).

These counters are connected in cascade and the count is changed by providing UP or DOWN pulses to integrated circuit U27. Each pulse causes the counter to increment by one count in the desired direction.

The pulses to be counted are being generated continuously by integrated circuit U17F. They are shaped for a small duty-cycle to minimize contact bounce problems in the Raise-Lower switches (Local or Remote).

Raise or Lower inputs are routed to integrated circuits

U20B and U20A which gate the pulses from integrated circuit U17F to the proper integrated circuit U27 input.

The output of integrated circuits U27 - U21 is buffered by integrated circuit U28 and connected to integrated circuits U29, U30 and U31. Integrated circuit U30 is a top-limit sensor, in that it changes its output when all of its inputs are in the “HIGH” state (maximum count).

This inhibits integrated circuit U20B and prevents further counting in the “UP” direction. Similarly, integrated circuit U29 senses the bottom condition, inhibiting integrated circuit U20A and preventing further counting in the “DOWN” direction.

Integrated circuit U31 is a Digital-to-Analog converter, providing an output in the range of 0 (for an input count of 0) to -10 volts (for an input count of 255). Integrated circuit U11A inverts this voltage so that it is in the range of 0 to +10. This APC Level signal is connected to the metering circuits and to the APC comparators. Note that the count cannot be changed during a power failure, as integrated circuits U20B and U20A have inputs connected to the Power/Enable circuit.

The APC comparators (integrated circuits U3A thru

U3D) determine the need (if any) to move the motor which controls the PA Screen power supply. Integrated circuit U3A compares the transmitter output (Forward

Power) with the APC Level. Resistors R145 and R146 form a voltage divider which sets the size of the window between the RAISE and LOWER thresholds. If the Forward power is below the lower side of this window, the output of integrated circuit U3A goes to the “LOW” state.

At the same time, integrated circuit U3B is comparing the Reflected Power from the transmission line with a level established by Antenna VSWR Foldback Set potentiometer R201 through integrated circuit U11C. This is the Foldback Limit and is the level beyond which reflected power should not operate when the transmitter is in the APC mode. If the Reflected power is below the

Foldback Limit, the output of integrated circuit U3B goes to the “LOW” state.

If the Reflected power is above the lower edge of the

Foldback Limit window the output of integrated circuit

U3B will be in the “HIGH” state and integrated circuit

U4G will illuminate the VSWR FOLDBACK LED on the

Controller front panel.

NOTE

Comparators U3A (low fwd power) and U3C (high fwd power) have hyserisis resistors R148 and

R137 connected from output to + input. This provides about 1% hysteresis to prevent APC “hunting.” If, at very low transmitter output power levels, this amount of hysteresis is too great (as evidenced by “overshoot” of the APC action), R148 and R137 may be increased to 200k ohms to reduce the hysteresis to 0.5%. R148 and R137 should never be totally removed from the circuit or changed to a value above 200k ohms.

If both outputs of integrated circuits U3A and U3B are in the “LOW” state, the anodes of both diode CR33 and diode CR34 go to the “LOW” state, allowing their common cathode to go to the “LOW” state. Integrated circuit

U8C now illuminates the Controller Front Panel AUTO

POWER SET (RAISE) LED, and integrated circuit U6C produces a Raise Request.

Integrated circuit U3C compares the Forward power with the TOP of the window. If the Forward power is greater than the APC Level, the output of integrated circuit U3C goes to the “LOW” state. Similarly, integrated circuit U3D compares the Reflected power with the

Foldback Limit. If the Reflected power is greater than the Foldback Limit, the output of integrated circuit U3D goes to the “LOW” state.

If either integrated circuit U3C or integrated circuit

U3D cause their common output to go to the “LOW” state, integrated circuit U8D will illuminate the Controller

Front Panel AUTO POWER SET (LOWER) LED and integrated circuit U6H produces a Lower request.

Whether or not the Raise or Lower requests are passed along to the Solid-State Relays for the Screen power supply motor, depends on the state of APC

Rev. C: 07-10-96 ECN 41259A 888-2386-001

WARNING: Disconnect primary power prior to servicing.

4-7

Latch integrated circuit U7B. This latch is controlled by the APC On and APC Off switches (both local and remote) and its output, if “LOW”, shunts the outputs from integrated circuits U6C and U6H through diodes CR29 and CR32 preventing the requests from becoming commands and therefore preventing them from moving the motor. If the APC Latch output is in the “HIGH” state, the Raise and Lower requests are passed to integrated circuits U6D and U6G and thus to the Solid-State Relays which move the motor.

Integrated circuit U4E together with diodes CR78 and

CR79, prevents the APC circuitry from moving the motor during the time that the Plate is turned off, even during an overload cycle.

The operation of the FOLDBACK indicator is somewhat unusual during varying antenna conditions such as may result from icing. As conditions get worse, the indicator will remain illuminated at all times, whether or not there is motion of the motor in the PA Screen power supply. As conditions improve, as a result of ice melting, the LED may be seen to extinguish and then come on again. This is explained as follows: as soon as the Reflected power falls below the Foldback Limit, the circuits in the APC move the motor to raise the transmitter power. During this time the FOLDBACK indicator is not illuminated. However, if there is still enough ice to prevent operation at full power, the indicator will illuminate again (and the motor will stop) when the Reflected power reaches the Foldback Limit. Eventually as the ice continues to melt, the Reflected power will stay below the Foldback Limit and the transmitter will return to full power, as determined by the APC Level adjustment.

The FOLDBACK indicator then will remain extinguished.

The transmitter has a Low Power Start feature useful in areas prone to antenna icing and/or power failures.

Low Power Start jumper plug P4 determines whether the transmitter will go through a gradual startup when the Plate Voltage is turned ON. With P4 in the 1-2 position, the APC ON, and the Plate Voltage OFF, the power control circuit will adjust the screen voltage control downward. This startup mode allows the transmitter to be turned ON in the event that the antenna has iced up during Off Air times.

With P4 in the 1-3 position, or the APC OFF, there is no automatic lowering function. The transmitter will then start at full power, unless prohibited by an overload condition.

Since the automatic lowering function occurs while the Plate Voltage is OFF, the position of plug P3, the filament warm up timer, can influence how low the power setting gets before the Plate Voltage is turned on.

If P3 is set for 90 seconds, pins 1-3, the screen voltage control will start at its minimum setting, and thus the transmitter will start at only 10 to 15% power.

It will then gradually raise to the power level previously set on the APC, or the highest level that the VSWR

Foldback will allow.

If the Filament Warmup jumper, P3, is in the 20 second position, the screen voltage control will not necessarily have enough time to reach its minimum setting during the filament warmup. In this case, the transmitter power will probably start at about 70%. However, it will start at a lower power level if you manually give the transmitter a filament warmup time longer than 20 seconds.

The circuit operates by giving a “Lower” command via the Plate control circuit.

When the Plate Voltage is

OFF, a logical high is present at U32-8.

This high is applied via resistor R236 and diode CR88 to the input of U6-15. This results in a screen voltage lower command unless the APC is OFF. In this case, the logical high signal provided by U32-8 is disallowed by the APC

ON/OFF circuit. This inhibit action is handled through diode CR87.

4-8 888-2386-001 Rev. C: 07-10-96 ECN 41259A

WARNING: Disconnect primary power prior to servicing.

SECTION V

MAINTENANCE

5.1

INTRODUCTION

This section provides preventive maintenance checks, cleaning, corrective maintenance, and troubleshooting information for the HT 3.5/5CD and HT

7/10CD FM BROADCAST TRANSMITTER.

5.2

PURPOSE

The information contained in this section is intended to provide guidance to establish a comprehensive maintenance program to promote operational readiness and eliminate downtime. Particular emphasis is placed on preventive maintenance and record keeping functions.

5.3

STATION RECORDS

The importance of keeping station performance records cannot be overemphasized. Separate logbooks should be maintained by operation and maintenance activities. These records can provide data for predicting potential problem areas and analyzing equipment malfunctions.

5.3.1

TRANSMITTER LOGBOOK

As a minimum performance characteristic, the transmitter should be monitored (using front panel meters) and the results recorded in the transmitter logbook at each shift change or at least once a day.

5.3.2

MAINTENANCE LOGBOOK

The maintenance logbook should contain a complete description of all maintenance activities required to keep the transmitter operational. A list of maintenance information to be recorded and analyzed to provide a data base for a failure reporting system is as follows:

DISCREPANCY

Describe the nature of the malfunction. Include all observable symptoms and performance characteristics.

CORRECTIVE ACTION

Describe the repair procedure used to correct the malfunction.

DEFECTIVE PART(S)

List all parts and components replaced or repaired. Include the following details: a. COMPONENT TIME IN USE b. COMPONENT PART NUMBER c. COMPONENT SCHEMATIC NUMBER d. COMPONENT ASSEMBLY NUMBER e. COMPONENT REFERENCE DESIGNATOR

SYSTEM ELAPSED TIME

Total transmitter time on.

NAME OF REPAIRMAN

Person who actually made the repair.

STATION ENGINEER

Indicates chief engineer noted and approved the transmitter repair.

5.3.3

SAFETY PRECAUTIONS

It is very dangerous to attempt to make measurements or to replace components with power on. The design of the transmitter provides safety features such that when a door is opened, an interlock switch shuts the transmitter off.

Use the grounding stick to touch every part in the area or circuit on which maintenance is to be performed before attempting maintenance.

5.4

PREVENTIVE MAINTENANCE

Preventive maintenance is a systematic series of operations performed periodically on equipment. As these procedures cannot be applied indiscriminately, specific instructions are necessary.

Visual Inspection. Inspection is the most important preventative maintenance operation because it determines the necessity for the others. Become thoroughly acquainted with normal operating conditions in order to recognize and identify abnormal conditions readily. The remedy for most visible defects is obvious. However, care must be taken if heat damaged components are located. Overheating is usually a symptom of trouble. It is essential to determine the actual cause of overheating before the heat damaged component is replaced, otherwise the damage will be repeated. Inspect for the following:

1. Overheating, indicated by discoloration, bulging of parts and peculiar odors.

2. Leakage of grease and oil.

3. Oxidation.

4. Dirt, corrosion, rust, mildew and fungus growth.

Feel. Check parts for overheating, especially rotating parts such as the blower motor. The need for lubrication, the lack of proper ventilation, or the existence of some defect can be detected and corrected before serious trouble occurs. Become familiar with operating temperatures in order to recognize deviations from the normal range.

Tighten. Tighten loose screws, bolts, and nuts. Do not tighten indiscriminately as fittings that are tightened beyond the pressure for which they are designed may be damaged or broken.

Clean. Clean parts when inspection shows that cleaning is required.

Adjust. Make adjustments when inspection shows that adjustments are necessary to maintain normal operation.

Rev. A: 02-07-96 888-2386-001

WARNING: Disconnect primary power prior to servicing.

5-1

Lubricate. Lubricate meshing mechanical surfaces at specified intervals with specified lubricants to prevent mechanical wear and keep the equipment operating normally. Do not over-lubricate.

Paint. Paint surfaces with the original type of paint

(use prime coat if necessary) when inspection shows rust, worn or broken paint film.

5.4.1

FILTER CLEANING

An air filter is provided in the cabinet back door.

Clean the filter once a week with warm water and a mild detergent with replacement done on an as-required basis. Additional filters (P/N 827 5285 001) may be ordered from HARRIS to assist in maintenance.

5.4.2

BLOWER MAINTENANCE

Inspect the blower and flushing for dust accumulation periodically. Remove dust with a vacuum cleaner and brush. Check the blower for wear. The blower motor bearings are sealed and lubricated for life to provide trouble-free operation. A blower that is noisy or shows wear will require unit replacement or replacement of the bearings. The blower mounting bolts should be checked for tightness.

Each motor is cooled by the air passing over the motor. If the ambient air temperature is too high or the air flow is restricted, the lubricant will gradually be vaporized from the motor bearings and bearing failure will occur. If very dirty air passes over the motor, the accumulation must be wiped from the motor and the dust must be blown out of the motor before the collection of dust impairs the motor cooling.

If the blower is operated to move very dusty air, the concave side of the impeller blades will collect dust and the dust will build up on the blade surfaces. If this happens, the performance of the blower will be reduced and unbalance will result with a possibility of damage to the blower.

5.4.3

MAINTENANCE OF COMPONENTS

The following paragraphs provide information for component maintenance.

5.4.3.1

SEMICONDUCTORS

Routine checking of semiconductors used in the

Transmitter is not required.

The best check of semiconductor performance is actual operation in the transmitter. When semiconductors are replaced, check circuitry operation which may be affected. Replacement semiconductors should be of the original type or a recommended direct replacement.

Preventive maintenance of transistors is accomplished by performing the following steps:

Inspect the semiconductors and surrounding area as accumulations of dirt or dust could form leakage paths.

Examine all semiconductors for loose connections or corrosion.

5.4.3.2

CAPACITORS

Preventive maintenance of capacitors is accomplished as follows:

5-2 888-2386-001

WARNING: Disconnect primary power prior to servicing.

Examine all capacitor terminals for loose connections or corrosion.

Ensure that component mountings are tight.

Examine the body of each capacitor for swelling, discoloration, or other evidence of breakdown.

Inspect oil-filled and electrolytic capacitors for leakage signs.

Use standard practices to repair poor solder connections with a low-wattage soldering iron.

Clean cases and bodies of all capacitors.

Dust accumulation or sharp points existing in the high voltage circuitry close to the capacitor can cause arcs or corona which may burn holes through the dielectric material.

5.4.3.3

FIXED RESISTORS

Preventive maintenance of fixed resistors is accomplished by the following steps:

When inspecting a chassis, printed-circuit board, or discrete component assembly, examine resistors for dirt or signs of overheating. Discolored, cracked, or chipped components indicate a possible overload.

When replacing a resistor ensure the replacement value corresponds to the component designated by the schematic diagram.

Clean dirty resistors with a small brush.

5.4.3.4

VARIABLE RESISTORS

Preventive maintenance of variable resistors is as follows:

Inspect and tighten all loose mountings, connections and control knob setscrews (do not disturb knob alignment).

If necessary, clean components with a dry brush or lint-free cloth.

When dirt is difficult to remove, clean with a cloth moistened with an approved cleaning solvent.

5.4.3.5

TRANSFORMERS

Preventative maintenance of transformers is accomplished by performing the following:

Feel each transformer soon after power removal for signs of overheating.

Inspect each transformer for dirt, loose mounting brackets and rivets, loose terminal connections, and insecure connecting lugs. Dust, dirt, or moisture between terminals may cause flashovers. Insulating compound or oil around the base of a transformer indicates overheating or leakage.

Tighten loose mounting lugs, terminals, or rivets.

Clean with a dry lint-free cloth. Use an approved cleaning solvent if required.

Rev. A: 02-07-96

Clean corroded contacts or connections with crocus cloth.

Replace defective transformers.

5.4.3.6

METERS

Preventative maintenance of the meters is accomplished as follows:

Inspect meters for loose, dirty, or corroded mountings and connections.

Examine leads for frayed insulation and broken strands.

Check for cracked or broken plastic cases and cover glasses.

Tighten loose mountings or connections. Since meter cases are made of plastic, exercise care to prevent breakage.

Clean meter cases and glass cover with a dry cloth.

Remove dirt from mountings and connections with a stiff brush.

Remove corrosion with crocus cloth.

5.4.3.7

RELAYS

Replace hermetically sealed relays if defective. Nonhermetically sealed relays are considered normal if:

The relay is mounted securely.

Connecting leads are not frayed and the insulation is not damaged.

Terminal connections are tight and clean.

Moving parts travel freely.

Spring tension is correct.

Contacts are clean, adjusted properly and make good contact.

The coil shows no signs of overheating.

Clean any dirty or corroded terminal connection or switch section with crocus cloth.

Replace defective switches.

5.4.3.8

SWITCHES

Preventative maintenance of switches is accomplished by checking the following:

Inspect switches for defective mechanical action or looseness of mounting and connections.

Examine cases for chips or cracks. Do not disassemble switches.

Inspect accessible contact switches for dirt, corrosion, looseness of mountings and connections.

Check contacts for pitting, corrosion, or wear.

Operate the switches to determine if each moves freely and is positive in action. In gang and wafer

Rev. A: 02-07-96

switches, the rotor should make good contact with the stationary member.

Tighten all loose connections and mountings.

Adjust contact tension.

Clean any dirty or corroded terminal connection or switch section with crocus cloth.

Replace defective switches.

5.4.3.9

INDICATORS AND INDICATOR SWITCHES

Preventative maintenance of indicator lamps and indicator switches is accomplished by checking the following:

Examine indicator sockets for corrosion, loose nuts and condition of rubber grommets.

Examine indicator switch by pulling the plastic cover

(indicator assembly) from the case.

Inspect indicator assemblies for broken or cracked covers, loose envelopes, loose mounting screws, and loose or dirty connections.

Tighten loose mounting screws and solder loose connections. If connections are dirty or corroded, clean with crocus cloth before soldering.

Clean indicator covers, bases, and glass bulbs with a dry cloth.

Clean corroded socket contacts and connections with crocus cloth.

Low operating voltages require clean contacts and connections.

5.4.3.10

TUBE

Life of the tube used in the FM Transmitter is dependent upon correct filament voltage and the flow of air over the anode of the tube. Once each month the tube should be removed and the fins cleaned of dust to assure free air flow and long tube life. Air may be blown through the fins in the reverse direction or the anode may be cleaned with soap and water.

5.5

CORRECTIVE MAINTENANCE

Corrective maintenance for the transmitter is limited by the objective of minimum down time. Maintainability and care are considerably simplified for operation and maintenance personnel as the transmitter is designed and built with highly reliable and proven elements to minimize down time.

5.5.1

TROUBLESHOOTING

Most troubleshooting consists of visual checks. Because of high voltages present in the transmitter, it is not safe to work with the power energized.

The meters, indicators, and fuses should be used to determine which stage is malfunctioning. The meters which indicate transmitter operating parameters are located across the front of the cabinet. All tuning controls are adjustable in view of the meters. Internal components may be accessed from both the front and rear of the transmitter.

888-2386-001

WARNING: Disconnect primary power prior to servicing.

5-3

In event of problems, isolate the trouble area to one of the following with the meters and indicators for each section:

Antenna and Feedline

Power Supply and Control Circuits

IPA Section

PA Section

Exciter

When the trouble is isolated to a specific area, refer to the theory section of this technical manual for circuit discussion to aid in problem resolution.

Table 5-1 and Table 5-2 lists some typical trouble symptoms, probable causes, and corrective actions pertaining to the overall Transmitter and to the Controller.

The corrective action given for a trouble symptom is not necessarily the only answer to a problem. It only tends to lead into the area that may be causing the trouble. In event parts are required, refer to Section VI, Parts List.

5-4 888-2386-001

WARNING: Disconnect primary power prior to servicing.

Rev. A: 02-07-96

Table 5-1. Transmitter Troubleshooting

TROUBLE SYMPTOM

Transmitter will not power up.

PROBABLE CAUSE

1. No primary voltage to terminal board TB1.

2. No +15 or -15 power on the

Controller board.

CORRECTIVE ACTION

1. Check Station circuit breakers.

No PA Filament voltage indicated on FILAMENT

VOLTS meter M4.

1. Loose wiring connections on transformer T4.

No PA Plate voltage indicated on PA PLATE Meter

M1.

2. Defective FILAMENT VOLTS meter M4.

1. PLATE circuit breaker CB1 set to the OFF (down) position.

No RF Output

No IPA Power output

Cannot adjust RF Power output.

2. Check that the Controller circuit breaker is set to the On (up) position. Also, that +20 and -20 volt power is at the input to the

Controller board.

1. Tighten wiring connections to the primary and secondary of transformer T4.

2. Replace FILAMENT VOLTS

Meter M4.

1. Reset PLATE circuit breaker

CB1 to the ON (up) position.

2. Resistor R26 open.

1. No drive to the PA tube.

2. No Exciter output.

3. No Plate or Screen voltage.

1. Defective IPA power supply.

2. No RF Drive to the IPA.

3. Defective IPA.

4. Shorted or open RF Cables to

IPA Low Pass filter

1. Defective Raise/Lower motor B2

2. Loose shaft of screen variac T6

3. Defective circuit on Controller printed-circuit board.

2. Replace resistor R26.

1. Check IPA voltages. Correct as necessary.

2. Check Exciter output. Correct as necessary.

3. Check Plate and Screen supplies. Repair as necessary.

1. Check IPA power supply and

IPA regulator for defective components. Replace defective components as necessary.

2. Check Exciter output. Repair as necessary.

3. Replace the IPA.

4. Repair or replace the RF Cables as necessary.

1. Repair or replace Raise/Lower motor B2.

2. Tighten the set screw.

3. Troubleshoot the Controller printed-circuit board. Repair or replace as necessary.

Rev. A: 02-07-96 888-2386-001

WARNING: Disconnect primary power prior to servicing.

5-5

Table 5-1. Transmitter Troubleshooting (Continued)

TROUBLE SYMPTOM

No air output from the air exhaust

PROBABLE CAUSE

1. Blower circuit breaker set to the

OFF (down) position.

2. Blower air inlet obstructed.

No PA Screen voltage.

Output Power low.

PA Plate voltage trips off.

Plate Voltage too high

(PLATE VOLTAGE Meter

M1 pegs).

3. Defective blower motor.

1. SCREEN circuit breaker CB2 tripped.

2. Resistor R102 open.

1. Low primary line voltage.

2. Low plate voltage.

3. Low PA Screen voltage.

4. PA Tube emission low.

1. PA Plate Current OVLD set too close to the trip point.

2. Intermittent rear door or front panel interlock.

3. Intermittent Air Switch.

4. Intermittent Fail-Safe system.

1. Shorted choke in power supply.

CORRECTIVE ACTION

1.

Reset BLOWER circuit breaker to the ON (up) position.

2. Clear obstruction from blower inlet.

3. Replace blower motor B4.

1. Reset SCREEN circuit breaker to the ON (up) position.

2. Replace defective resistor.

1. Contact the local power company for an increase in line voltage.

2. Check Plate voltage supply components and replace as necessary.

3. Check Screen voltage supply components and replace as necessary.

4. Replace the PA Tube.

1. Check overload setting on multimeter position. If at or near normal operating plate current, adjust R62 for midrange on scale.

2. Check that rear door and front panel close properly. Check the operation of the interlock switch.

3. Check air filter and replace if necessary. Check for back pressure or blockage in the air exhaust system, correct as necessary.

4. Check for poor STL or faulty remote control path. Correct as necessary.

1. Replace choke. Transmitter may be operated with filter capacitor disconnected until the choke can be replaced.

5-6 888-2386-001

WARNING: Disconnect primary power prior to servicing.

Rev. A: 02-07-96

Table 5-1. Transmitter Troubleshooting (Continued)

TROUBLE SYMPTOM

Plate Overload (3-Time) trips with the Fault LED illuminated.

PROBABLE CAUSE

1. Output line to the Antenna either shorted or open.

2. PA Plate Circuit mistuned or overloaded.

3. Bandpass filter arcing due to combination load fault and Directional Coupler reverse diode failure.

1. No PA Plate voltage present.

Screen Overload (3-Time) trips with the Fault LED illuminated.

2. PA Screen circuit shorted.

IPA VSWR Overload (3-

Time) trips with the Fault

LED.

Plate Voltage trips off with

VSWR LOAD Overload

LED illuminated.

Plate step-start contactor does not pull in.

CORRECTIVE ACTION

1. Reduce power and check Antenna VSWR and transmission line. Correct the defect.

2. Readjust the tuning and the loading.

3. Repair or replace the Bandpass filter. Troubleshoot and repair

Antenna and Transmission line as necessary.

1. Troubleshoot PA Plate voltage supply

3. PA tube may be shorted.

1. PA Input match or Grid tuning misadjusted.

2. Possible short in PA grid blocker capacitor C101 or C102.

1. Transmission line shorted or open.

2. Possible short in the wiring of

PA Screen by-pass capacitor

C105. Locate and correct the shorted condition.

3. Replace tube.

1. Reduce Exciter power output and adjust input match and grid tune for peaks in PA grid current.

2.

Replace blocker capacitor

C101 or C102.

1. Troubleshoot the transmission line and repair as necessary.

2. Antenna damaged due to objects striking the Antenna or from weather damage.

1. Circuit Breaker CB4 (Blower) or CB3 (Bias) set to “OFF” position

2. Coil of contactor K2 open.

3. Plate SSR contactor K7 not closing on HT 3.5/5CD (K2, K6, &

K7 on HT 7/10CD).

2. Repair the antenna.

1. Set both circuit breakers to the

“ON” position.

2. Replace contactor K6.

3. Measure the control voltage at terminals 3 and 4 on contactor

K7. The voltage should be about

4 or 5 volts. If the correct voltage is not present, troubleshoot the

Controller and repair as necessary.

Rev. A: 02-07-96 888-2386-001

WARNING: Disconnect primary power prior to servicing.

5-7

Table 5-1. Transmitter Troubleshooting (Continued)

TROUBLE SYMPTOM

Plate Main Contactor K6 does not pull in.

Auto Power Set drifts.

VSWR Foldback does not operate.

Transmitter off frequency.

High FM Noise.

High AM Noise

High Audio Distortion

PROBABLE CAUSE

1. Fuse F2 or F3 open.

2. Coil of Contactor K6 open.

3. Resistors R3, R4 (or R5 on 3phase HT 7/10FM).

4. Step-Start Contactor K2 not pulling in.

1. Defective forward power diode.

2. Auto Power circuit on Controller board.

1. Defective reverse power diode in Directional Coupler DC1.

1. Exciter Frequency switches set wrong.

1. RF from the antenna appearing in the program lines to the Exciter.

2. Poor transmitter and audio input equipment grounding.

3. Noise generated inside exciter.

1. Defective filtering in PA Plate supply.

2. IPA voltage regulator not operating properly.

3. RF Drive from the Exciter too high.

1. Defective Exciter.

CORRECTIVE ACTION

1. Check fuses and replace if found open.

2. Replace Contactor K6.

3. Replace R3, R4 (or R5).

4. Troubleshoot Step-Start circuit,

K7, K2.

1. Check voltage at E2-16. If the voltage is not steady when the

PA plate current is steady, replace the FORWARD diode in

Directional Coupler DC-1.

2.

Refer to Controller Troubleshooting table for corrective action.

1. Check voltage at E2-17. If no voltage is present when a known

VSWR is present, replace the reverse power diode.

1. Refer to the Exciter Technical

Manual.

1. Filter Carrier RF from program lines, limiter, and all other audio equipment.

2. Ground the equipment properly.

3. Troubleshoot exciter.

1. Check filter chokes and capacitors. Replace defective components.

2. Troubleshoot the IPA voltage regulator. Repair as needed.

3. Reduce the rf drive from the

Exciter.

1. Refer to the DIGIT™ Exciter

Technical Manual for corrective action. Check the Exciter operation separate from the transmitter.

5-8 888-2386-001

WARNING: Disconnect primary power prior to servicing.

Rev. A: 02-07-96

Table 5-1. Transmitter Troubleshooting (Continued)

TROUBLE SYMPTOM

No modulation

Remote control functions and metering failure.

1. Remote control equipment faulty.

Apparent interference to a

TV channel close to the RF

Carrier 2nd Harmonic.

PROBABLE CAUSE

2. Defective program lines and/or audio input equipment.

1. No audio input to the Exciter.

2. Defective Exciter.

2. Controller inputs and outputs.

1. Overload of TV from FM carrier at the fundamental frequency.

When TV input is overloaded, the

TV input amplifier will develop power at twice the FM Carrier frequency.

CORRECTIVE ACTION

2. Check all audio input equipment and lines separately.

1. Check limiters, lines, STL, and station wiring to the Exciter. Repair as necessary.

2. Refer to the Exciter Technical

Manual and restore Exciter operation as necessary.

1. Refer to the Remote Control equipment Technical Manuals.

Check the operation of the equipment and repair as necessary.

2.

Refer to Controller Troubleshooting Table and repair the

Controller as necessary.

1. Trap out the FM carrier at the input to the TV set.

Rev. A: 02-07-96 888-2386-001

WARNING: Disconnect primary power prior to servicing.

5-9

Table 5-2. Controller Troubleshooting

CORRECTIVE ACTION TROUBLE SYMPTOM

POWER SUPPLY

+20 VOLTS (Positive end of capacitor C2) missing or -20

VOLTS (Negative end of capacitor C5) missing.

PROBABLE CAUSE

1. Loose ribbon connectors.

2. Dual 20-VOLT Power Supply in the main cabinet.

+15 VOLTS (Cathode end of diode CR5) missing.

1. Regulator integrated circuit U1

“open”.

2. Diode CR5 “open”.

3. +15-VOLT circuit “shorted”.

+15B VOLTS (Cathode end of diode CR3) missing.

1. +15 VOLTS missing and standby battery disconnected or discharged.

2. Diode CR3 “open” and battery disconnected or discharged.

3. Diode CR3 “open” or +15

VOLTS missing and diode CR4

“open” or battery disconnected or discharged.

1. +15 VOLTS missing.

+15B VOLTS (Cathode end of diode CR3) below 10 volts.

-15 VOLTS (Anode end of diode CR7) missing.

2. Diode CR3 “open”.

1. Regulator integrated circuit U2

“open”.

2. Diode CR7 “open”.

3. -15 VOLT circuit “shorted”.

1. Check the connectors at both ends of the ribbon cable which connects J2 of the Controller printed-circuit board to the feedthru connector in the rear wall of the Controller enclosure, and both ends of the ribbon cable in the main cabinet which connects the feed-thru connector in the

Controller enclosure rear wall to the barrier strip assembly.

2. Check primary power to the dual 20-VOLT Power Supply in the main cabinet.

1. Replace integrated circuit U1.

2. Replace diode CR5.

3. Relieve the “shorted” condition.

1. Restore +15 Volts, connect or replace the battery.

2. Replace diode CR5, connect or replace the battery.

3. Restore +15 VOLTS, replace diodes CR3 and/or CR4, connect or replace battery.

1. Restore +15 VOLTS.

2. Replace Diode CR3.

1. Replace integrated circuit U2.

2. Replace diode CR7.

3. Relieve the “shorted” condition.

5-10 888-2386-001

WARNING: Disconnect primary power prior to servicing.

Rev. A: 02-07-96

Table 5-2. Controller Troubleshooting (Continued)

TROUBLE SYMPTOM

TRI-STATE CONTROL is in the “HIGH” state.

POWER ENABLE is in the

“LOW” state.

PROBABLE CAUSE

1. +15 VOLTS low or missing (including power failure).

2. Diode CR27 “open”.

3. Integrated circuit U17E defective.

1. TRI-STATE CONTROL is in the “HIGH” state.

CORRECTIVE ACTION

1. Restore the voltage to the +15volt level.

2. Replace diode CR27.

3. Replace integrated circuit U17.

1.

Refer to the TRI-STATE

CONTROL is in the “HIGH” state section on the discussed previously in this table.

2. Replace integrated circuit U17.

RECHARGEABLE BAT-

TERY does not recharge.

2. Integrated circuit U17D defective.

3. POWER ENABLE circuit

“shorted”.

1. Resistor R8 is not installed.

3. Relieve the short.

1. Install resistor R8.

2. Battery is defective.

2. Replace standby battery.

OPERATING CIRCUITS

FILAMENT ON circuit does not start blower (test point

TP11 stays “LOW”).

1. BLOWER circuit breaker is set to the OFF position.

1. Set BLOWER circuit breaker to the ON position.

2. FILAMENT OFF circuit is

“stuck” (this may be the remote circuit if the transmitter LO-

CAL/REMOTE switch is set to the REMOTE position).

3. Controller does not have power.

2.

Check Local and Remote

FILAMENT OFF switches. Repair or replace as necessary.

4. Main transmitter power is off.

5. Integrated circuit U15G is defective.

6. Integrated circuit U32B is defective.

7. Integrated circuit U15H is defective.

8. Resistor R20 is “shorted”.

3. Check power source to the.

transmitter. Restore as necessary.

Check cable connections to the

Controller printed-circuit board.

4. Activate transmitter power.

5. Replace integrated circuit U15.

6. Replace integrated circuit U32.

7. Replace integrated circuit U15.

8. Relieve the short.

Rev. A: 02-07-96 888-2386-001

WARNING: Disconnect primary power prior to servicing.

5-11

Table 5-2. Controller Troubleshooting (Continued)

TROUBLE SYMPTOM PROBABLE CAUSE

9. Diode CR48 is “open”.

1. Air switch is defective.

BLOWER runs but FILA-

MENT does not turn ON.

BLOWER and FILAMENT turn OFF when FILAMENT

ON pushbutton switch is released (circuit does not

“latch”).

CORRECTIVE ACTION

9. Replace diode CR48.

1. Replace air switch S5.

1. Integrated circuit U15A is defective.

1. Replace integrated circuit U15.

FILAMENT comes ON but timer does not “time-out”

(test point TP18 remains

“LOW”).

2. Integrated circuit U25B is defective.

3. Integrated circuit U8F is defective.

4. Diode CR20 is “open”.

1. Integrated circuit U8A is defective.

2. Replace integrated circuit U25.

3. Replace integrated circuit U8.

4. Replace diode CR20.

1. Replace integrated circuit U8.

2. Integrated circuit U17A is defective.

3. Diode CR22 is “open”.

4. Capacitor C46 is “shorted”.

5. Integrated circuit U19 is defective.

1. Diode CR49 is “shorted”.

2. Replace integrated circuit U17.

3. Replace diode CR22.

4. Replace capacitor C46.

5. Replace integrated circuit U19.

1. Replace diode CR49.

Local FILAMENT ON circuit works only when transmitter is in “REMOTE”.

FILAMENT OFF circuit does not operate.

1. Integrated circuit U15 is defective.

2. Integrated circuit U32B is defective.

3. Integrated circuit U15H is defective.

1. Replace integrated circuit U15.

2. Replace integrated circuit U32.

3. Replace integrated circuit U15.

5-12 888-2386-001

WARNING: Disconnect primary power prior to servicing.

Rev. A: 02-07-96

Table 5-2. Controller Troubleshooting (Continued)

TROUBLE SYMPTOM

FILAMENT OFF circuit will remain OFF only if the FILA-

MENT OFF pushbutton switch is held depressed.

When the FILAMENT OFF switch is released, the

BLOWER and FILAMENT circuits again turn “ON”.

PROBABLE CAUSE

1. Integrated circuit U25B is defective.

2. Integrated circuit U8F is defective.

1. Diode CR46 is “shorted”.

Local FILAMENT OFF circuit operates only when the

LOCAL/REMOTE switch is set to “REMOTE” and the transmitter is operating in the

“REMOTE” MODE.

PLATE ON circuit does not operate

CORRECTIVE ACTION

1. Replace integrated circuit U25.

2. Replace integrated circuit U8.

1. Replace diode CR46.

1. PLATE circuit breaker is set to the OFF position.

2. PLATE OFF circuit is “stuck” in the OFF mode. If the LO-

CAL/REMOTE switch is set to the “REMOTE” position, the trouble may be in the REMOTE circuitry.

3. FILAMENT timer integrated circuit U19 has not “timed-out”.

1. Set the PLATE circuit breaker turn the PLATE power supply to the ON (up) position.

2.

Check Local and Remote

PLATE OFF switches. Repair or replace as necessary.

4. Door is open.

5. Load VSWR OVLD set control potentiometer R59 is adjusted too low.

6. IPA VSWR Overload set control potentiometer R219 is adjusted too low.

7. EXCITER AFC circuit is

“open”.

3.

Check Test Point TP18.

Should go “HIGH” if integrated circuit has “timed-out”.

4. Close and latch the door.

5. Refer to paragraphs under

OVERLOAD AND ALARM

CIRCUITS in this table and adjust potentiometer R59 as necessary.

6. Refer to paragraphs under

OVERLOAD AND ALARM

CIRCUITS in this table and adjust potentiometer R219 as necessary.

7. Check that the Exciter is plugged in.

Rev. A: 02-07-96 888-2386-001

WARNING: Disconnect primary power prior to servicing.

5-13

Table 5-2. Controller Troubleshooting (Continued)

TROUBLE SYMPTOM

No AC RESTART after a power failure.

PROBABLE CAUSE

8. EXTERNAL INTERLOCK circuit is “open”.

CORRECTIVE ACTION

8. Check the EXTERNAL IN-

TERLOCK circuitry and repair as necessary.

1. Install battery or recharge.

1. Battery is discharged or not installed.

2. Diode CR69 is “shorted” (FILA-

MENT restarts but not the

PLATE).

3. Diode CR70 is “shorted”.

4. Jumper Plug P2 is not installed in the 1 to 2 position(FILAMENT restarts but not the PLATE).

1. Diode CR52 is “shorted”.

2. Replace diode CR69.

3. Replace diode CR70.

4. Install jumper plug P2 in the 1 to 2 position.

1. Replace diode CR52.

Local PLATE ON circuit operates only when the LO-

CAL/REMOTE switch is set to the “REMOTE” position.

PLATE turns OFF when the

PLATE ON pushbutton switch is released (circuit does not"latch").

1. Integrated circuit U15E is defective.

1. Replace integrated circuit U15.

2. Integrated circuit U25A is defective.

3. Integrated circuit U8E is defective.

4. Diode CR8 is “open”.

1. Diode CR31 is “open”.

2. Replace integrated circuit U25.

3. Replace integrated circuit U8.

4. Replace diode CR8.

1. Replace diode CR31.

FILAMENT OFF pushbutton switch turns off FILAMENT and PLATE circuits. However, depressing FILAMENT

ON pushbutton switch turns

ON both the FILAMENT and PLATE circuits.

PLATE OFF circuit operates only while the PLATE OFF pushbutton switch is depressed, when released,

PLATE ON circuit turns ON again.

2. Refer to PLATE OFF problem below.

1. Integrated circuit U25A is defective.

1. Replace integrated circuit U25.

5-14 888-2386-001

WARNING: Disconnect primary power prior to servicing.

Rev. A: 02-07-96

Table 5-2. Controller Troubleshooting (Continued)

TROUBLE SYMPTOM PROBABLE CAUSE

2. Integrated circuit U8E is defective.

1. Integrated circuit U15C is defective.

PLATE OFF circuit does not operate when the PLATE

OFF pushbutton switch is depressed.

Local PLATE-OFF circuit operates only when the LO-

CAL/REMOTE switch is set to the “REMOTE” position.

METERING CIRCUITS

Incorrect readings on the

MULTIMETER in all switch positions.

2. Integrated circuit U32A is defective.

3. Integrated circuit U15D is defective.

1. Diode CR55 is “shorted”.

1. MULTIMETER is defective.

Incorrect readings on one or more (but not all) MUL-

TIMETER SELECTOR

Switch positions.

2. Defective integrated circuit

U11B.

3. Capacitor C26 is defective.

4. MULTIMETER SELECTOR switch S3 is defective.

1. Ig1 position.

2. Eg1 position.

CORRECTIVE ACTION

2. Replace integrated circuit U8.

1. Replace integrated circuit U15.

2. Replace integrated circuit U32.

3. Replace integrated circuit U15.

1. Replace diode CR55.

1. Check output of integrated circuit U11B pin 7. +10 volts produces full scale deflection. Replace meter if defective.

2. Check gain with a high impedance meter of an oscillascope to ground. Circuit has unity gain

(U11-5 = U11-7). Replace integrated circuit U11 if defective.

3. Replace capacitor C26.

4. Replace MULTIMETER SE-

LECTOR switch S3.

1. Check integrated circuit U16A with a high-impedance meter to ground. Gain from resistor R21

(either end) to test point TP5 is

-0.5

(negative input produces positive output of half the magnitude).

2. Check integrated circuit U5C with a high-impedance meter to ground. Gain from resistor R15

(either end) to test point TP3 is

-6.8

(negative input produces positive output 6.8 times the magnitude).

Rev. A: 02-07-96 888-2386-001

WARNING: Disconnect primary power prior to servicing.

5-15

Table 5-2. Controller Troubleshooting (Continued)

TROUBLE SYMPTOM PROBABLE CAUSE

3. Ig2 position.

4. Eg2 position.

5. Iipa position.

6. Eipa position.

Incorrect readings on one or more of the remote metering circuits.

1. Faulty control wiring.

2. Ep position.

3. Ip position.

4. PA Reflected Power position.

CORRECTIVE ACTION

3. Check integrated circuit U16C with a high-impedance meter to ground. Gain from resistor R43

(either end) to test point TP9 is

-3.3.

4. Check integrated circuit U5D with a high-impedance meter to ground. Gain from resistor R18

(either end) to test point TP4 is

1.0 (unity).

5. Check integrated circuit U16D with a high-impedance meter connected between resistor R48

(positive meter lead) and resistor

R51 (negative meter lead). Gain to test point TP10 (measured to ground) is 10.

6. Check integrated circuit U5B with a high-impedance meter to ground. Gain from resistor R10

(either end) to test point TP2 is

.33.

1. Check remote control wiring for defects.

2. Check integrated circuit U5A with a high-impedance meter to ground. Gain from resistor R4

(either end) to TP1 is 1.0 (unity).

3. Check integrated circuit U16B with a high-impedance meter to ground. Gain from resistor R38

(either end) to test point TP8 is

-1.0.

4.

Check integrated circuits

U26D and U26C with a high-impedance meter to ground. Gain from resistor R32 (either end) to test point TP7 is -12.

5-16 888-2386-001

WARNING: Disconnect primary power prior to servicing.

Rev. A: 02-07-96

Table 5-2. Controller Troubleshooting (Continued)

TROUBLE SYMPTOM PROBABLE CAUSE

5. PA Forward Power position.

CORRECTIVE ACTION

5. Check integrated circuit U26B with a high-impedance meter to ground. Gain from resistor R26

(either end) to test point TP6 is

-12.

OVERLOAD AND ALARM

CIRCUITS

Operating MULTIMETER

SELECTOR switch S3 to (or past) OVLD SET position 7

(AUXILIARY MULTIME-

TER SELECTOR Switch

S4), causes an overload (determined by the position of switch S4).

Overload circuit appears to be inoperative.

1. The overload setting (as determined by the position of AUXIL-

IARY MULTIMETER SELEC-

TOR Switch S4) is set too close to the operating value of the selected circuit.

1. Overload circuit out of adjustment.

1. Readjust the overload setting to a compatible level with the operating value of the circuit selected.

Overloads occur but there are no panel indications to identify them.

No overload indicators operate.

1. Defective indicator(s).

1. OVERLOADS RESET Switch is closed (Local or Remote).

1. Test by adjusting the overload setting up to the operating value.

Operate MULTIMETER SELEC-

TOR switch S3 to position 7 then operate AUXILIARY MUL-

TIMETER SELECTOR Switch

S4 to the various settings and adjust the various potentiometers as follows:

PARAMETER S4 ADJUST

PA Refld Pwr 1 R59

Ip 2 R62

Ig2 3 R65

Iipa 4 R68

IPA Refld Pwr 6 R219

1. Test the overloads one at a time (as described above) observing that the proper indicator turns

ON and can be reset.

1. Check the RESET pushbutton switch and the remote control wiring (if any) for a “stuck”

(“shorted”) condition.

Rev. A: 02-07-96 888-2386-001

WARNING: Disconnect primary power prior to servicing.

5-17

Table 5-2. Controller Troubleshooting (Continued)

TROUBLE SYMPTOM

Overload indicators cannot be reset or are always on.

Overload recycle is sluggish or intermittent.

Overloads are counted by the

Three-Time counter but do not recycle.

PROBABLE CAUSE

1. Defective integrated circuit.

CORRECTIVE ACTION

1. Replace integrated circuits U9,

U14, U22A, U12A, U13 or U4, as appropriate for the indicator which operates improperly.

2. Relieve “shorted” condition.

2. Remote control wiring

“shorted” to ground or to foreign potentials.

1. Integrated circuit U17B is defective.

2. Integrated circuit U17C is defective.

3. Integrated circuit U7A is defective.

4. Integrated circuit U8B is defective.

5. Integrated circuit U18 is defective.

1. Integrated circuit U8G is defective.

1. Replace integrated circuitU17.

2. Replace integrated circuitU17.

3. Replace integrated circuitU7.

4. Replace integrated circuitU8.

5. Replace integrated circuitU18.

1. Replace integrated circuit U8.

2. Diode CR15 is “open”.

1. Diode CR23 is “open”.

2. Replace diode CR15.

1. Replace diode CR23.

Exciter AFC Fault does not hold Plate “off” until until

AFC Fault goes away.

Three-Time fault counter turns the transmitter “off” after one overload.

1. Jumper Plug P1 in wrong position.

1. Relocate Jumper Plug P1 to the correct position as follows:

Three-Time fault counter does not reset automatically after one or two overload cycles.

1. Integrated circuit U24 is defective.

POSITION FUNCTION

1-2 One-Time

1-3 Three-Time

1. Replace integrated circuit U24.

2. Integrated circuit U23 is defective.

2. Replace integrated circuit U23.

5-18 888-2386-001

WARNING: Disconnect primary power prior to servicing.

Rev. A: 02-07-96

Table 5-2. Controller Troubleshooting (Continued)

TROUBLE SYMPTOM

Fault condition does not reset and transmitter does not turn

“ON” when PLATE ON pushbutton is depressed.

PROBABLE CAUSE

1. Integrated circuit U15B is defective.

CORRECTIVE ACTION

1. Replace integrated circuit U15.

2. Diode CR9 is “open”.

1. Diode CR8 is “open”.

2. Replace diode CR9.

1. Replace diode CR8.

Fault resets automatically after timer runs “out”.

One-Time/Three-Time fault counter never reaches full count.

1. Integrated circuit U24 is defective.

1. Replace integrated circuit U24.

Fault counter turns transmitter off but FAULT indicator does illuminate.

2. Diode CR8 is “shorted”.

3. Integrated circuit U23 is defective.

1. LED indicator DS9 is “open” or

“shorted”.

2. Replace diode CR8.

3. Replace integrated circuit U23.

1. Relieve “shorted” condition or replace the LED.

2. Integrated circuit U4A is defective.

1. Diode CR16 is “open”.

2. Replace integrated circuit U4.

1. Replace diode CR16.

Fault counter illuminates

FAULT indicator but does not turn transmitter off.

Air loss keeps Filament off

(and FILAMENT indicator does not illuminate) but AIR indicator does not illuminate.

1. LED DS8 indicator is “open” or

“shorted”.

1. Relieve “shorted” condition or replace the LED.

Door switch turns Plate off but DOOR indicator does not illuminate.

2. Integrated circuit U13H is defective.

1. LED indicator DS7 is “open” or

“shorted”.

2. Replace integrated circuit U13.

1. Relieve “shorted” condition or replace the LED.

2. Integrated circuit U13G is defective.

1. Diode CR10 is “open”.

2. Replace integrated circuit U13.

1. Replace diode CR10.

Door switch illuminates

DOOR indicator but PLATE indicator does not extinguish.

POWER CONTROL

Rev. A: 02-07-96 888-2386-001

WARNING: Disconnect primary power prior to servicing.

5-19

Table 5-2. Controller Troubleshooting (Continued)

TROUBLE SYMPTOM

Manual Power Lower does not operate when MANUAL

POWER SET switch is set to the LOWER position.

PROBABLE CAUSE

1. Motor is at the lower limit.

2. Integrated circuit U6G is defective.

3. Solid-State Relay K4 is defective.

1. Motor is at the upper limit.

Manual Power Raise does not operate when MANUAL

POWER SET switch is set to the RAISE position.

Manual Power Lower does not have priority over Raise.

AUTO POWER SET

RAISE/LOWER switches do not operate (as observed with

MULTIMETER switch S3 is operated to position 8).

CORRECTIVE ACTION

1. Normal condition.

2. Replace integrated circuit U6.

3. Replace Solid-State Relay K4.

1. Normal condition.

2. Integrated circuit U6D is defective.

3. Integrated circuit U6G is defective (holding motor at lower limit).

1. Diode CR30 is “open”.

2. Replace integrated circuit U6.

3. Replace integrated circuit U6.

1. Replace diode CR30.

1. Integrated circuit U17F is defective.

1. Replace integrated circuit U17.

Auto Power Raise or Auto

Power Lower does not operate.

2. Integrated circuit U17D is defective.

3. Integrated circuit U27 is defective.

4. Integrated circuit U28 is defective.

5. Integrated circuit U31 is defective.

6. Integrated circuit U11A is defective.

1. Integrated circuit U20B (Raise) is defective.

2. Replace integrated circuit U17.

3. Replace integrated circuit U27.

4. Replace integrated circuit U28.

5. Replace integrated circuit U31.

6. Replace integrated circuit U11.

1. Replace integrated circuit U20.

2. Integrated circuit U20A

(Lower)is defective.

2. Replace integrated circuit U20.

5-20 888-2386-001

WARNING: Disconnect primary power prior to servicing.

Rev. A: 02-07-96

Table 5-2. Controller Troubleshooting (Continued)

TROUBLE SYMPTOM

Auto Power RAISE selection causes MULTIMETER indication to go to the top end of the scale and suddenly return to 0 and start up again.

Auto Power LOWER Selection causes MULTIMETER indication to go down to 0 and suddenly return to the top end of the scale and start down again.

AUTO POWER SET

RAISE/LOWER switches cause MULTIMETER to move over a limited range

(about 1/16th of full scale).

PROBABLE CAUSE

1. Integrated circuit U30 is defective.

1. Integrated circuit U29 is defective.

1. Integrated circuit U27 is defective.

CORRECTIVE ACTION

1. Replace integrated circuit U30.

1. Replace integrated circuit U29.

1. Replace integrated circuit U27.

AUTO POWER SET

RAISE/LOWER switches cause MULTIMETER to move over a limited range

(other than 1/16th of full scale).

2. Integrated circuit U21 is defective.

1. Integrated circuit U28 is defective.

2. Replace integrated circuit U21.

1. Replace integrated circuit U28.

2. Integrated circuit U31 is defective.

3. Integrated circuit U11A is defective.

1. Integrated circuit U3C is defective.

2. Replace integrated circuit U31.

3. Replace integrated circuit U11.

1. Replace integrated circuit U3.

AUTO POWER SET switch will adjust transmitter power up but not down.

AUTO POWER SET switch will adjust transmitter power down but not up (VSWR

FOLDBACK LED is not illuminated).

2. Integrated circuit U3D is defective.

1. Integrated circuit U3A is defective.

2. Replace integrated circuit U3.

1. Replace integrated circuit U3.

Rev. A: 02-07-96 888-2386-001

WARNING: Disconnect primary power prior to servicing.

5-21

Table 5-2. Controller Troubleshooting (Continued)

TROUBLE SYMPTOM

AUTO POWER SET switch will adjust transmitter power down but not up (VSWR

FOLDBACK LED is illuminated).

PROBABLE CAUSE

1. Excessive Reflected Power.

Foldback circuit operates correctly but FOLDBACK indicator does not illuminate.

2. VSWR Foldback Limit potentiometer R201 is adjusted too low.

3. Integrated circuit U3B is defective.

1. VSWR FOLDBACK LED

DS17 is “open” or “shorted”.

Auto Power Control circuit operates correctly but RAISE

LED does not illuminate.

2. Integrated circuit U4G is defective.

1. RAISE LED DS13 is “open” or

“shorted”.

Auto Power Control circuit operates correctly but

LOWER LED does not illuminate.

2. Integrated circuit U8C is defective.

1. LOWER LED DS12 is “open” or or “shorted”.

2. Integrated circuit U8D is defective.

1. Plate circuit is off.

Auto Power Control circuit appears to operate correctly

(RAISE and LOWER LED’s operate) but raise/lower motor does not operate.

2. Integrated circuit U4E is defective.

3. Integrated circuit U4D is defective (giving false APC-On indication).

4. Integrated circuit U6C is defective (will not Raise).

5. Integrated circuit U6H is defective (will not Lower).

CORRECTIVE ACTION

1. This is normal if there is ice on the antenna. The antenna or transmission line may have a problem developing.

2. Adjust VSWR Foldback Limit potentiometer R201.

3. Replace integrated circuit U3.

1. Replace LED DS17.

2. Replace integrated circuit U4.

1. Replace LED DS13.

2. Replace integrated circuit U8.

1. Replace LED DS12.

2. Replace integrated circuit U8.

1. Depress PLATE ON pushbutton switch.

2. Replace integrated circuit U4.

3. Replace integrated circuit U4.

4. Replace integrated circuit U6.

5. Replace integrated circuit U6.

5-22 888-2386-001

WARNING: Disconnect primary power prior to servicing.

Rev. A: 02-07-96

Table 5-2. Controller Troubleshooting (Continued)

TROUBLE SYMPTOM

Auto Power Control circuit is operating but APC-ON LED is not illuminated.

PROBABLE CAUSE

1. LED DS14 is “open” or

“shorted”.

APC On/Off switch does not operate.

2. Integrated circuit U4D is defective.

1. Integrated circuit U6E is defective.

2. Integrated circuit U6F is defective.

3. Integrated circuit U7B is defective.

4. Integrated circuit U8H is defective.

CORRECTIVE ACTION

1. Replace LED DS14.

2. Replace integrated circuit U4.

1. Replace integrated circuit U6.

2. Replace integrated circuit U6.

3. Replace integrated circuit U7.

4. Replace integrated circuit U8.

Rev. A: 02-07-96 888-2386-001

WARNING: Disconnect primary power prior to servicing.

5-23

TROUBLE SYMPTOM PROBABLE CAUSE CORRECTIVE ACTION

5-24 888-2386-001

WARNING: Disconnect primary power prior to servicing.

Rev. A: 02-07-96

Section VI

Parts List

Introduction

This section provides a description, reference designator and part number for selected replaceable parts and assemblies required for proper maintenance of the HT7/10CD FM BROADCAST TRANSMITTER. Table below lists assemblies having replaceable parts, the table number listing the parts, and the page number on which the table is located. Identity of the assembly nomenclature in table signifies the equipment level within the overall equipment configuration.

NOTE

Actual component values may vary slightly from component values listed on schematics and parts lists. Due to industry-wide shortages, it is sometimes necessary to use parts other than those specified. In every case, however, a substitute part is selected for conformance to overall design specifications so that equipment performance is not affected. Components that are frequency determined or peculiar to an individual transmitter are identified by a HARRIS part number and Transmitter component number on the final test addendum sheets shipped with the equipment.

Replaceable Parts Service

Refer to Replaceable Parts Service paragraph on back side of manual title page.

Table 6-1.

Table 6-2.

Table 6-3.

Table 6-4.

Table 6-5.

Table 6-6.

Table 6-7.

Table 6-8.

Table 6-9.

Table 6-10.

Table 6-11.

Table 6-12.

Table 6-13.

Table 6-14.

Table 6-15.

Replaceable Parts List Index

XMTR, HT-7CD, 8KW, 3PH . . . . . . . . . . . . . . . . . . 994 9564 001

CONVERSION PTS 3PH HT7FM . . . . . . . . . . . . . . 992 8318 001

XMTR, HT-10CD, 10KW, 3PH . . . . . . . . . . . . . . . . . 994 9566 001

CONVERSION PTS 3PH HT10FM . . . . . . . . . . . . . 992 8315 001

XMTR, BASIC FM UNIT #1 . . . . . . . . . . . . . . . . . 992 8311 001

DIR COUPLER ASSY . . . . . . . . . . . . . . . . . . 992 5620 001

SWITCH BOARD, A5 . . . . . . . . . . . . . . . . . . 992 6617 002

* PWB, XMTR CONTROL A6 * . . . . . . . . . . . . . . 992 6619 002

XMTR CONTROL BOARD . . . . . . . . . . . . . . 943 4979 009

CUST IN-FACE/CONT PS, A4 . . . . . . . . . . . . . . 992 7040 001

AUXILLARY BOARD,A2 . . . . . . . . . . . . . . . . . 992 7044 001

IPA REGULATOR A3 . . . . . . . . . . . . . . . . . . 992 7070 001

PWB, IPA REGULATOR A3A1 . . . . . . . . . . . . 992 7071 001

300W IPA MODULE A8 . . . . . . . . . . . . . . . . . 992 7073 001

FM XMTR CABLE PKG . . . . . . . . . . . . . . . . . . . 992 8309 001

6-2

6-2

6-4

6-4

6-6

6-11

6-12

6-12

6-15

6-15

6-15

6-16

6-16

6-17

6-17

Rev. B: 07-10-96 888-2389-001

WARNING: Disconnect primary power prior to servicing.

6-1

Table 6-1. XMTR, HT-7CD, 8KW, 3PH - 994 9564 001

HARRIS P/N DESCRIPTION QTY/UM REF. SYMBOLS/EXPLANATIONS

357 0090 000. . . . . . SCR, 8-32 X 1/2 BHMS . . . . . . . . . . . . . . . . . . . . 0 #XV101, FREQ. DET. PART,QTY 2 REQ’D FOR FREQ.

374 0172 000. . . . . . TUBE, 4CX7500A . . . . . . . . . . . . . . . . . . . . . . . . 1

472 1249 000. . . . . . XFMR, CONST VOLT . . . . . . . . . . . . . . . . . . . . . 0

472 1682 000. . . . . . XFMR, CONST VOLT 1000VA . . . . . . . . . . . . . . 0

636 0037 000. . . . . . METER, ELAPSED TIME 50HZ . . . . . . . . . . . . . 0

102 MHZ AND ABOVE

TO V101

60 HZ ACCESSORY

50 HZ ACCESSORY

M006 50 HZ OPTION QTY 1 REQ’D - RETURN

636-0036-000 TO STOCK

646 1473 000. . . . . . INSERT, HT7FM . . . . . . . . . . . . . . . . . . . . . . . . . 0

646 1574 000. . . . . . INSERT, HT-7CD . . . . . . . . . . . . . . . . . . . . . . . . 0

QTY 1 REQUIRED WHEN XMTR NOT SHIPPED WITH DIGIT

EXCITER

QTY 1 REQUIRED WHEN XMTR SHIPPED WITH DIGIT

EXCITER

817 1594 029. . . . . . STANDOFF, GRID TUNE . . . . . . . . . . . . . . . . . . 0 FREQ. DET. PART QTY-1 REQUIRED FOR FREQ

94.0 TO 96.9 MHZ QTY-2 REQUIRED FOR FREQ

97.0 TO 108.6 MHZ

817 2074 036. . . . . . RUNNING LIST, HT7/10 3 PH . . . . . . . . . . . . . . . 0

839 7832 041. . . . . . OUTLINE, CABINET, HT-10FM . . . . . . . . . . . . . . 0

839 7832 082. . . . . . SCH, HT-7/10 OVERALL 3PH . . . . . . . . . . . . . . 0

839 7832 085. . . . . . SCHEM,4 WIRE HT10 OVERALL . . . . . . . . . . . . 0

843 4979 035. . . . . . ASSY INSTR, OUTLINE, FL1, . . . . . . . . . . . . . . . 0

843 4979 036. . . . . . FAMILY TREE,HT-3.5/5/7/10 . . . . . . . . . . . . . . . . 0

917 1594 031. . . . . . INDUCTOR BLOCK, COARSE . . . . . . . . . . . . . . 0

922 0856 086. . . . . . FLAG, NEUTRALIZING, . . . . . . . . . . . . . . . . . . . 0

922 0856 087. . . . . . FLAG, NEUTRALIZING . . . . . . . . . . . . . . . . . . . . 0

922 0856 089. . . . . . SPACER, TUBE SKT. BLOCK . . . . . . . . . . . . . . 0

FREQ. DET. PART QTY 1 REQ’D FOR FREQ

103.6 TO 108.6 MHZ

#C106, FREQ DET PART, QTY 1 REQ’D FOR FREQ OF

102 THRU 108 MHZ

#C106, FREQ DET PART, QTY 1 REQ’D FOR FREQ OF

88 THRU 101 MHZ

#XV101, FREQ DET PART, QTY 1 REQ’D FOR FREQ

102 THRU 108 MHZ

988 2321 001. . . . . . DP HT 7/10FM 3-PHASE . . . . . . . . . . . . . . . . . . 1

989 0093 007. . . . . . PKG CHK, HT7FM 3PH REG . . . . . . . . . . . . . . . 0

989 0093 008. . . . . . PKG CHK, HT7FM 3PH AIR . . . . . . . . . . . . . . . . 0

992 7075 001. . . . . . KIT, 4WIRE “Y” XMTR MOD . . . . . . . . . . . . . . . . 0

USE PACKING CHECK LIST 989-0093-007 FOR REGULAR

SHIPMENT OR 989-0093-008FOR AIR SHIPMENT

USE PACKING CHECK LIST 989-0093-007 FOR REGULAR

SHIPMENT OR 989-0093-008FOR AIR SHIPMENT

4 WIRE 360/415 VAC 50 HZ OPTION

1 REQD

992 8311 001. . . . . . XMTR, BASIC FM UNIT #1 . . . . . . . . . . . . . . . . . 1

992 8318 001. . . . . . CONVERSION PTS 3PH HT7FM . . . . . . . . . . . . 1

994 9124 001. . . . . . FM EXCITER, THE-1 . . . . . . . . . . . . . . . . . . . . . 0

994 9410 001. . . . . . DIGIT EXCITER ANALOG I/O . . . . . . . . . . . . . . . 0

994 9410 003. . . . . . DIGIT EXCITER DIGITAL I/O. . . . . . . . . . . . . . . . 0

THESE PARTS ARE USED TO CONVERT BASIC XMTR FOR

8 KW OPERATION.

A001

A001

A001

Table 6-2. CONVERSION PTS 3PH HT7FM - 992 8318 001

HARRIS P/N DESCRIPTION QTY/UM REF. SYMBOLS/EXPLANATIONS

300 2879 000. . . . . . SCR, 6-32 X 1-1/2 . . . . . . . . . . . . . . . . . . . . . . . . 1 #FL101, #PA CAVITY

335 0007 000. . . . . . WASHER NYLON .175 ID . . . . . . . . . . . . . . . . . . 4

358 0003 000. . . . . . BRACKET RESISTOR MTG . . . . . . . . . . . . . . . . 2

#FL101, #PA CAVITY

#R021

358 0473 000. . . . . . CLAMP, HOSE . . . . . . . . . . . . . . . . . . . . . . . . . . 1

358 3000 000. . . . . . END STOP, RAIL MTG MODULE . . . . . . . . . . . . 2

358 3092 000. . . . . . STUD, BRS 6-32 X 3/8 . . . . . . . . . . . . . . . . . . . . 1

358 3135 000. . . . . . STUD, BRS 1/4-20 X 2 . . . . . . . . . . . . . . . . . . . . 2

6-2 888-2389-001

WARNING: Disconnect primary power prior to servicing.

Rev. B: 07-10-96

384 0582 000 . . . . . RECT, SI 2.5A MIN., 20KVA . . . . . . . . . . . . . . . . 2

410 0010 000 . . . . . INSULATOR ROUND NS5W 0208 . . . . . . . . . . . 4

410 0061 000 . . . . . INSULATOR SQ NS5W 1212 . . . . . . . . . . . . . . . 3

472 1316 000 . . . . . XFMR, FIL, 7.5V 120A . . . . . . . . . . . . . . . . . . . . 1

472 1655 000 . . . . . XFMR, PWR, PRI 208/240V . . . . . . . . . . . . . . . . 1

472 1684 000 . . . . . XFMR, PLT, 817-2153-001 . . . . . . . . . . . . . . . . 1

476 0304 000 . . . . . REACTOR FLTR 10HY . . . . . . . . . . . . . . . . . . . 1

476 0420 000 . . . . . CHOKE, 817-2074-002 . . . . . . . . . . . . . . . . . . . . 1

516 0396 000 . . . . . CAP 6500 PF 10KV . . . . . . . . . . . . . . . . . . . . . . 3

516 0436 000 . . . . . CAP 5PF 7500V 10% . . . . . . . . . . . . . . . . . . . . . 1

542 0095 000 . . . . . RES 10K OHM 5% 12W . . . . . . . . . . . . . . . . . . . 3

542 0284 000 . . . . . RES 3 OHM 5% 100W . . . . . . . . . . . . . . . . . . . . 1

542 1601 000 . . . . . RES 3 OHM 155W 10% . . . . . . . . . . . . . . . . . . . 1

548 2172 000 . . . . . RES 10 MEG OHM 6W 1% . . . . . . . . . . . . . . . . 1

548 2400 289 . . . . . RES 825 OHM 1/2W 1% . . . . . . . . . . . . . . . . . . 1

560 0055 000 . . . . . MOV 4500A 70J 250VAC . . . . . . . . . . . . . . . . . . 1

570 0324 000 . . . . . CONTACTOR 50A 4P . . . . . . . . . . . . . . . . . . . . 1

606 0809 000 . . . . . CKT BKR, 60A 240VAC 3P . . . . . . . . . . . . . . . . 1

614 0808 000 . . . . . TERM BLOCK MODULAR 283 FT . . . . . . . . . . . 8

614 0810 000 . . . . . JUMPER, HORIZONTAL 283 . . . . . . . . . . . . . . . 4

620 1510 000 . . . . . JACK, BULKHEAD, BNC . . . . . . . . . . . . . . . . . . 2

632 1078 000 . . . . . MTR, 3ADC, 4-1/2", W . . . . . . . . . . . . . . . . . . . . 1

632 1126 000 . . . . . MTR 0-10KVDC, 4-1/2", W . . . . . . . . . . . . . . . . . 1

646 1426 000 . . . . . END PLATE 283 FRONT ENTRY . . . . . . . . . . . . 1

646 1473 000 . . . . . INSERT, HT7FM . . . . . . . . . . . . . . . . . . . . . . . . . 1

660 0057 000 . . . . . * BATTERY 9V HEAVY DUTY . . . . . . . . . . . . . . 1

817 1375 001 . . . . . CLIP METER SUPPORT . . . . . . . . . . . . . . . . . . 4

829 9135 301 . . . . . MTG. TERM BOARD . . . . . . . . . . . . . . . . . . . . . 1

917 2170 001 . . . . . STRAP, CU 1.06 X .5 . . . . . . . . . . . . . . . . . . . . . 1

922 0856 047 . . . . . DISC., TRAP . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1

922 0856 048 . . . . . STRAP, TRAP . . . . . . . . . . . . . . . . . . . . . . . . . . 1

922 0856 058 . . . . . PLATE, CAPACITOR MTG. . . . . . . . . . . . . . . . . 1

922 0856 061 . . . . . STRAP, CAP CONNECTION . . . . . . . . . . . . . . . 1

922 0856 066 . . . . . PLATE, HT10FM DECK MTG . . . . . . . . . . . . . . 1

922 0856 074 . . . . . ASSY, TUNING STUB . . . . . . . . . . . . . . . . . . . . 1

922 0856 095 . . . . . PLATE, FEED THRU . . . . . . . . . . . . . . . . . . . . . 1

922 0856 096 . . . . . PLATE, FEED THRU . . . . . . . . . . . . . . . . . . . . . 1

922 0856 099 . . . . . INSULATOR, FEED THRU . . . . . . . . . . . . . . . . . 2

922 0856 102 . . . . . PLATE, TRAP . . . . . . . . . . . . . . . . . . . . . . . . . . . 1

922 0856 103 . . . . . BLOCKER, TRAP . . . . . . . . . . . . . . . . . . . . . . . . 1

922 0856 111 . . . . . PLATE, HT10FM 3PH COMP MK . . . . . . . . . . . . 1

922 0993 001 . . . . . ASSY, LINE SUPPORT . . . . . . . . . . . . . . . . . . . 1

939 7832 046 . . . . . CONTACT, ANODE . . . . . . . . . . . . . . . . . . . . . . 1

939 7832 076 . . . . . FEED THRU, DIELECTRIC . . . . . . . . . . . . . . . . 4

943 4979 021 . . . . . OUTPUT FILTER TEE SECTION . . . . . . . . . . . . 1

943 4979 034 . . . . . OUTPUT FILTER, LOW PASS . . . . . . . . . . . . . . 1

999 2547 001 . . . . . HARDWARE LIST . . . . . . . . . . . . . . . . . . . . . . . 1

999 2548 001 . . . . . WIRE/TUBING LIST . . . . . . . . . . . . . . . . . . . . . . 1

CR009 CR010

#922-0856-103

#C002

T004

#T003

T001

L004

L001

C002 C003 C005

C117A

R009 R010 R011

R021

R5

#R017

A006 R008 THIS RESISTOR TO BE USED

IN THE XMTR CONTROL PWB ONLY WHEN A RECHARGABLE

BATTERY IS INSTALLED

RV003

J003 J004

M002

M001

A006 BT001 NOT RECHARGABLE BATTERY

#M001 #M002

#FL101, #PA CAVITY

#FL101, #PA CAVITY

#C002 #C003 #C005

#C002 #C003 #C004

#FL101, #PA CAVITY

#FL101, #PA CAVITY

#XV001, #PA CAVITY

FL002 J005 J006

FL001 DC001

Rev. B: 07-10-96 888-2389-001

WARNING: Disconnect primary power prior to servicing.

6-3

Table 6-3. XMTR, HT-10CD, 10KW, 3PH - 994 9566 001

HARRIS P/N DESCRIPTION QTY/UM REF. SYMBOLS/EXPLANATIONS

357 0090 000. . . . . . SCR, 8-32 X 1/2 BHMS . . . . . . . . . . . . . . . . . . . . 0 #XV101, FREQ. DET. PART,QTY 2 REQ’D FOR FREQ.

374 0172 000. . . . . . TUBE, 4CX7500A . . . . . . . . . . . . . . . . . . . . . . . . 1

472 1249 000. . . . . . XFMR, CONST VOLT . . . . . . . . . . . . . . . . . . . . . 0

472 1682 000. . . . . . XFMR, CONST VOLT 1000VA . . . . . . . . . . . . . . 0

636 0037 000. . . . . . METER, ELAPSED TIME 50HZ . . . . . . . . . . . . . 0

102 MHZ AND ABOVE

TO V101

60 HZ ACCESSORY

50 HZ ACCESSORY

M006 50 HZ OPTION QTY 1 REQ’D - RETURN

636-0036-000 TO STOCK

646 1447 000. . . . . . INSERT, HT 10FM . . . . . . . . . . . . . . . . . . . . . . . 0

646 1568 000. . . . . . INSERT, HT 10CD . . . . . . . . . . . . . . . . . . . . . . . 0

QTY 1 REQUIRED WHEN XMTR NOT SHIPPED WITH DIGIT

EXCITER

QTY 1 REQUIRED WHEN XMTR SHIPPED WITH DIGIT

EXCITER

817 1594 029. . . . . . STANDOFF, GRID TUNE . . . . . . . . . . . . . . . . . . 0 FREQ. DET. PART QTY-1 REQUIRED FOR FREQ

94.0 TO 96.9 MHZ QTY-2 REQUIRED FOR FREQ

97.0 TO 108.6 MHZ

817 2074 036. . . . . . RUNNING LIST, HT7/10 3 PH . . . . . . . . . . . . . . . 0

839 7832 041. . . . . . OUTLINE, CABINET, HT-10FM . . . . . . . . . . . . . . 0

839 7832 082. . . . . . SCH, HT-7/10 OVERALL 3PH . . . . . . . . . . . . . . 0

839 7832 085. . . . . . SCHEM,4 WIRE HT10 OVERALL . . . . . . . . . . . . 0

843 4979 035. . . . . . ASSY INSTR, OUTLINE, FL1, . . . . . . . . . . . . . . . 0

843 4979 036. . . . . . FAMILY TREE,HT-3.5/5/7/10 . . . . . . . . . . . . . . . . 0

917 1594 031. . . . . . INDUCTOR BLOCK, COARSE . . . . . . . . . . . . . . 0

922 0856 086. . . . . . FLAG, NEUTRALIZING, . . . . . . . . . . . . . . . . . . . 0

922 0856 087. . . . . . FLAG, NEUTRALIZING . . . . . . . . . . . . . . . . . . . . 0

922 0856 089. . . . . . SPACER, TUBE SKT. BLOCK . . . . . . . . . . . . . . 0

FREQ. DET. PART QTY 1 REQ’D FOR FREQ

103.6 TO 108.6 MHZ

#C106, FREQ DET PART, QTY 1 REQ’D FOR FREQ OF

102 THRU 108 MHZ

#C106, FREQ DET PART, QTY 1 REQ’D FOR FREQ OF

88 THRU 101 MHZ

#XV101, FREQ DET PART, QTY 1 REQ’D FOR FREQ

102 THRU 108 MHZ

988 2321 001. . . . . . DP HT 7/10FM 3-PHASE . . . . . . . . . . . . . . . . . . 1

989 0093 001. . . . . . PKG CHK, HT10FM 3PH REG . . . . . . . . . . . . . . 0

989 0093 002. . . . . . PKG CHK, HT10FM 3PH AIR . . . . . . . . . . . . . . . 0

992 7075 001. . . . . . KIT, 4WIRE “Y” XMTR MOD . . . . . . . . . . . . . . . . 0

USE PACKING CHECK LIST 989-0093-001 FOR REGULAR

SHIPMENT OR 989-0093-002FOR AIR SHIPMENT

USE PACKING CHECK LIST 989-0093-001 FOR REGULAR

SHIPMENT OR 989-0093-002FOR AIR SHIPMENT

4 WIRE 360/415 VAC 50 HZ OPTION

1 REQD

992 8311 001. . . . . . XMTR, BASIC FM UNIT #1 . . . . . . . . . . . . . . . . . 1

992 8315 001. . . . . . CONVERSION PTS 3PH HT10FM . . . . . . . . . . . 1

994 9124 001. . . . . . FM EXCITER, THE-1 . . . . . . . . . . . . . . . . . . . . . 0

994 9410 001. . . . . . DIGIT EXCITER ANALOG I/O . . . . . . . . . . . . . . . 0

994 9410 003. . . . . . DIGIT EXCITER DIGITAL I/O. . . . . . . . . . . . . . . . 0

THESE PARTS ARE USED TO CONVERT BASIC XMTR FOR

10 KW OPERATION.

A001

A001

A001

Table 6-4. CONVERSION PTS 3PH HT10FM - 992 8315 001

HARRIS P/N DESCRIPTION QTY/UM REF. SYMBOLS/EXPLANATIONS

300 2879 000. . . . . . SCR, 6-32 X 1-1/2 . . . . . . . . . . . . . . . . . . . . . . . . 1 #FL101, #PA CAVITY

335 0007 000. . . . . . WASHER NYLON .175 ID . . . . . . . . . . . . . . . . . . 4

358 0003 000. . . . . . BRACKET RESISTOR MTG . . . . . . . . . . . . . . . . 2

#FL101, #PA CAVITY

358 0473 000. . . . . . CLAMP, HOSE . . . . . . . . . . . . . . . . . . . . . . . . . . 1

358 3000 000. . . . . . END STOP, RAIL MTG MODULE . . . . . . . . . . . . 2

358 3092 000. . . . . . STUD, BRS 6-32 X 3/8 . . . . . . . . . . . . . . . . . . . . 1

358 3135 000. . . . . . STUD, BRS 1/4-20 X 2 . . . . . . . . . . . . . . . . . . . . 2

6-4 888-2389-001

WARNING: Disconnect primary power prior to servicing.

Rev. B: 07-10-96

384 0582 000 . . . . . RECT, SI 2.5A MIN., 20KVA . . . . . . . . . . . . . . . . 2

410 0010 000 . . . . . INSULATOR ROUND NS5W 0208 . . . . . . . . . . . 4

410 0061 000 . . . . . INSULATOR SQ NS5W 1212 . . . . . . . . . . . . . . . 3

472 1316 000 . . . . . XFMR, FIL, 7.5V 120A . . . . . . . . . . . . . . . . . . . . 1

472 1655 000 . . . . . XFMR, PWR, PRI 208/240V . . . . . . . . . . . . . . . . 1

472 1684 000 . . . . . XFMR, PLT, 817-2153-001 . . . . . . . . . . . . . . . . 1

476 0304 000 . . . . . REACTOR FLTR 10HY . . . . . . . . . . . . . . . . . . . 1

476 0420 000 . . . . . CHOKE, 817-2074-002 . . . . . . . . . . . . . . . . . . . . 1

516 0396 000 . . . . . CAP 6500 PF 10KV . . . . . . . . . . . . . . . . . . . . . . 3

516 0436 000 . . . . . CAP 5PF 7500V 10% . . . . . . . . . . . . . . . . . . . . . 1

542 0095 000 . . . . . RES 10K OHM 5% 12W . . . . . . . . . . . . . . . . . . . 3

542 0284 000 . . . . . RES 3 OHM 5% 100W . . . . . . . . . . . . . . . . . . . . 1

542 1601 000 . . . . . RES 3 OHM 155W 10% . . . . . . . . . . . . . . . . . . . 1

548 2172 000 . . . . . RES 10 MEG OHM 6W 1% . . . . . . . . . . . . . . . . 1

548 2400 289 . . . . . RES 825 OHM 1/2W 1% . . . . . . . . . . . . . . . . . . 1

560 0055 000 . . . . . MOV 4500A 70J 250VAC . . . . . . . . . . . . . . . . . . 1

570 0324 000 . . . . . CONTACTOR 50A 4P . . . . . . . . . . . . . . . . . . . . 1

606 0809 000 . . . . . CKT BKR, 60A 240VAC 3P . . . . . . . . . . . . . . . . 1

614 0808 000 . . . . . TERM BLOCK MODULAR 283 FT . . . . . . . . . . . 8

614 0810 000 . . . . . JUMPER, HORIZONTAL 283 . . . . . . . . . . . . . . . 4

620 1510 000 . . . . . JACK, BULKHEAD, BNC . . . . . . . . . . . . . . . . . . 2

632 1078 000 . . . . . MTR, 3ADC, 4-1/2", W . . . . . . . . . . . . . . . . . . . . 1

632 1126 000 . . . . . MTR 0-10KVDC, 4-1/2", W . . . . . . . . . . . . . . . . . 1

646 1426 000 . . . . . END PLATE 283 FRONT ENTRY . . . . . . . . . . . . 1

646 1447 000 . . . . . INSERT, HT 10FM . . . . . . . . . . . . . . . . . . . . . . . 1

660 0057 000 . . . . . * BATTERY 9V HEAVY DUTY . . . . . . . . . . . . . . 1

817 1375 001 . . . . . CLIP METER SUPPORT . . . . . . . . . . . . . . . . . . 4

829 9135 301 . . . . . MTG. TERM BOARD . . . . . . . . . . . . . . . . . . . . . 1

917 2170 001 . . . . . STRAP, CU 1.06 X .5 . . . . . . . . . . . . . . . . . . . . . 1

922 0856 047 . . . . . DISC., TRAP . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1

922 0856 048 . . . . . STRAP, TRAP . . . . . . . . . . . . . . . . . . . . . . . . . . 1

922 0856 058 . . . . . PLATE, CAPACITOR MTG. . . . . . . . . . . . . . . . . 1

922 0856 061 . . . . . STRAP, CAP CONNECTION . . . . . . . . . . . . . . . 1

922 0856 066 . . . . . PLATE, HT10FM DECK MTG . . . . . . . . . . . . . . 1

922 0856 074 . . . . . ASSY, TUNING STUB . . . . . . . . . . . . . . . . . . . . 1

922 0856 095 . . . . . PLATE, FEED THRU . . . . . . . . . . . . . . . . . . . . . 1

922 0856 096 . . . . . PLATE, FEED THRU . . . . . . . . . . . . . . . . . . . . . 1

922 0856 099 . . . . . INSULATOR, FEED THRU . . . . . . . . . . . . . . . . . 2

922 0856 102 . . . . . PLATE, TRAP . . . . . . . . . . . . . . . . . . . . . . . . . . . 1

922 0856 103 . . . . . BLOCKER, TRAP . . . . . . . . . . . . . . . . . . . . . . . . 1

922 0856 111 . . . . . PLATE, HT10FM 3PH COMP MK . . . . . . . . . . . . 1

922 0993 001 . . . . . ASSY, LINE SUPPORT . . . . . . . . . . . . . . . . . . . 1

939 7832 046 . . . . . CONTACT, ANODE . . . . . . . . . . . . . . . . . . . . . . 1

939 7832 076 . . . . . FEED THRU, DIELECTRIC . . . . . . . . . . . . . . . . 4

943 4979 021 . . . . . OUTPUT FILTER TEE SECTION . . . . . . . . . . . . 1

943 4979 034 . . . . . OUTPUT FILTER, LOW PASS . . . . . . . . . . . . . . 1

999 2547 001 . . . . . HARDWARE LIST . . . . . . . . . . . . . . . . . . . . . . . 1

999 2548 001 . . . . . WIRE/TUBING LIST . . . . . . . . . . . . . . . . . . . . . . 1

CR009 CR010

#C002

T004

#T003

T001

L004

L001

C002 C003 C005

C117A

R009 R010 R011

R021

R5

#R017

A006 R008 THIS RESISTOR TO BE USED

IN THE XMTR CONTROL PWB ONLY WHEN A RECHARGABLE

BATTERY IS INSTALLED

RV003

J003 J004

M002

M001

A006 BT001 NOT RECHARGABLE BATTERY

#M001 #M002

#FL101, #PA CAVITY

#FL101, #PA CAVITY

#C002 #C003 #C005

#C002 #C003 #C004

#FL101, #PA CAVITY

#FL101, #PA CAVITY

#XV001, #PA CAVITY

FL002 J005 J006

FL001 DC001

Rev. B: 07-10-96 888-2389-001

WARNING: Disconnect primary power prior to servicing.

6-5

Table 6-5. XMTR, BASIC FM UNIT #1 - 992 8311 001

HARRIS P/N DESCRIPTION QTY/UM REF. SYMBOLS/EXPLANATIONS

000 0000 002. . . . . . APPEARS ON HIGHER LEVEL . . . . . . . . . . . . . 0 A001 A06BT01 A06R08 C002 C003 C005

CR001 CR009 CR010 DC001 FL001 FL002

L001 L002 M001 M002 R005 R006

R007 R009 R010 R011 R017 R026

RV003 T001 T004 T006 V101 R030

THRU R038

C121, #PA CAVITY 000 0000 003. . . . . . FREQUENCY DETERMINED PART . . . . . . . . . . 0

051 0001 017. . . . . . * ADHESIVE, LIQUID NAILS . . . . . . . . . . . . . . . . 0

086 0001 001. . . . . . * SEALANT, MILD STRENGTH . . . . . . . . . . . . . 0

302 0222 000. . . . . . SCR, 1/4-20 X 2 . . . . . . . . . . . . . . . . . . . . . . . . . 4

#REAR DOOR

#REAR DOOR

#B001

324 0239 000. . . . . . PUSHNUT FASTENER . . . . . . . . . . . . . . . . . . . . 4

335 0080 000. . . . . . WASHER NYLON .5 HOLE . . . . . . . . . . . . . . . . . 2

335 0264 000. . . . . . WASHER, TEFLON #6 X .125 . . . . . . . . . . . . . 14

344 0103 000. . . . . . SKT SET SCREW 4-40 X 3/8 . . . . . . . . . . . . . . . 1

358 0184 000. . . . . . RETAINER 82 ALL HDS . . . . . . . . . . . . . . . . . . . 5

358 0239 000. . . . . . PLUG BUTTON 1.00 HOLE . . . . . . . . . . . . . . . . 1

358 0411 000. . . . . . RING RETAINING .250 . . . . . . . . . . . . . . . . . . . . 2

358 0420 000. . . . . . SPACER, ROLLED 1/4 L . . . . . . . . . . . . . . . . . . 4

#L103, #PA CAVITY

XV101, #PA CAVITY

#A002

358 0437 000. . . . . . BUSHING PANEL .252 ID . . . . . . . . . . . . . . . . . . 4

358 0721 000. . . . . . RECEPTACLE 85 CLIP . . . . . . . . . . . . . . . . . . . . 4

358 0960 000. . . . . . COUPLING W/4 SET SCR . . . . . . . . . . . . . . . . . 2

358 1020 000. . . . . . COUPLING FLEXIBLE NYLON . . . . . . . . . . . . . . 2

358 1165 000. . . . . . COLLAR 1/4 HOLE . . . . . . . . . . . . . . . . . . . . . . . 4

358 2401 000. . . . . . STANDOFF, HINGED 1/4 OD . . . . . . . . . . . . . . . 1

358 2426 000. . . . . . PLUG, WHITE 2" HOLE . . . . . . . . . . . . . . . . . . . 4

358 2589 000. . . . . . FLAT CABLE MOUNT . . . . . . . . . . . . . . . . . . . . . 2

358 2628 000. . . . . . CABLE PUSH MOUNT . . . . . . . . . . . . . . . . . . . 19

358 2635 000. . . . . . RIVET MOUNT LOW PROFILE . . . . . . . . . . . . 31

358 2637 000. . . . . . STUD OVAL HD 82-19-300-16 . . . . . . . . . . . . . . 1

358 2995 000. . . . . . END PLATE, 261 TERM BD . . . . . . . . . . . . . . . . 2

358 3092 000. . . . . . STUD, BRS 6-32 X 3/8 . . . . . . . . . . . . . . . . . . . . 2

358 3109 000. . . . . . STUD, BRS 8-32 X 1 . . . . . . . . . . . . . . . . . . . . . . 2

358 3121 000. . . . . . STUD, BRS 10-32 X 1 . . . . . . . . . . . . . . . . . . . . . 2

358 3123 000. . . . . . STUD, BRS 10-32 X 1-1/2 . . . . . . . . . . . . . . . . . . 1

#R015 #C107 #PA CAVITY

#L105 # PA CAVITY

#TB006 #TB008

#PA CAVITY

#R012

358 3134 000. . . . . . STUD, BRS 1/4-20 X 1-3/4 . . . . . . . . . . . . . . . . . 1

358 3166 000. . . . . . MOLDED UNIVERSAL JOINT . . . . . . . . . . . . . . 1

358 3216 000. . . . . . STUD, OVAL HD 1/4 TURN . . . . . . . . . . . . . . . . 4

358 3371 000. . . . . . UNIVERSAL JOINT .25 BORE . . . . . . . . . . . . . . 1

359 0179 000. . . . . . CONNECTOR MALE 268-N . . . . . . . . . . . . . . . . 2

384 0431 000. . . . . . RECT. 1N4001 . . . . . . . . . . . . . . . . . . . . . . . . . . 1

384 0582 000. . . . . . RECT, SI 2.5A MIN., 20KVA . . . . . . . . . . . . . . . . 4

384 0702 000. . . . . . RECT FW BRIDGE 600V 35A . . . . . . . . . . . . . . . 1

386 0016 000. . . . . . ZENER 1N2974A 10V 10W 10% . . . . . . . . . . . . . 1

398 0019 000. . . . . . FUSE, FAST CART 2A 250V . . . . . . . . . . . . . . . 3

398 0141 000. . . . . . FUSE 3AB FAST 20A 250V . . . . . . . . . . . . . . . . 1

402 0001 000. . . . . . CLIP, FUSE 1.062 60A 600V . . . . . . . . . . . . . . . . 2

402 0020 000. . . . . . CLIP, FUSE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1

402 0107 000. . . . . . CLIP, FUSE 9/16 . . . . . . . . . . . . . . . . . . . . . . . . . 2

402 0203 000. . . . . . FUSEHOLDER 3AG SHOCKSAFE . . . . . . . . . . . 4

410 0011 000. . . . . . INSULATOR ROUND NS5W 0210 . . . . . . . . . . . 2

410 0014 000. . . . . . INSULATOR ROUND NS5W 0220 . . . . . . . . . . . 3

410 0017 000. . . . . . INSULATOR ROUND NS5W 0310 . . . . . . . . . . . 9

410 0021 000. . . . . . INSULATOR ROUND NS5W 0324 . . . . . . . . . . . 4

#S005

CR013

CR005 CR006 CR007 CR008

CR001

CR003

F002 F003 F004

F001

#DECK GND STRAP

#GND HOOK

XF001 XF002 XF003 XF004

#R017

#R012 #R014 #R018 #R020

#R013 #R019

6-6 888-2389-001

WARNING: Disconnect primary power prior to servicing.

Rev. B: 07-10-96

410 0061 000 . . . . . INSULATOR SQ NS5W 1212 . . . . . . . . . . . . . . . 1

410 0152 000 . . . . . INSULATOR BSHG NS5W-4103 . . . . . . . . . . . . 1

410 0156 000 . . . . . INSULATOR BSHG NS5W-4203 . . . . . . . . . . . . 1

432 0072 000 . . . . . BLOWER CENTRIMAX 230VAC . . . . . . . . . . . . 1

436 0273 000 . . . . . MOTOR, SYNCH 1/2 RPM . . . . . . . . . . . . . . . . . 1

448 0254 000 . . . . . FASTENER, RIGHT HAND . . . . . . . . . . . . . . . . 1

448 0261 000 . . . . . FASTENER, LEFT HAND . . . . . . . . . . . . . . . . . 1

448 0541 000 . . . . . LATCH, FLUSH, LIFT & TURN . . . . . . . . . . . . . . 1

448 0844 000 . . . . . LATCH, DRAW . . . . . . . . . . . . . . . . . . . . . . . . . . 2

452 0075 000 . . . . . GEAR, HELICAL AD1-30 . . . . . . . . . . . . . . . . . . 2

472 0709 000 . . . . . XFMR, ISO, . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1

472 0712 000 . . . . . XFMR, POWER . . . . . . . . . . . . . . . . . . . . . . . . . 1

472 1661 000 . . . . . XFMR, POWER . . . . . . . . . . . . . . . . . . . . . . . . . 1

474 0055 000 . . . . . XFMR, VAR, POWER . . . . . . . . . . . . . . . . . . . . 1

476 0304 000 . . . . . REACTOR FLTR 10HY . . . . . . . . . . . . . . . . . . . 2

494 0005 000 . . . . . CHOKE R F 1.8 UH . . . . . . . . . . . . . . . . . . . . . . 2

506 0258 000 . . . . . CAP .5UF 400V 10% . . . . . . . . . . . . . . . . . . . . . 0

510 0713 000 . . . . . CAP 10 UF 1500VDC . . . . . . . . . . . . . . . . . . . . . 2

510 0750 000 . . . . . CAP 2X 10UF 10KV +/-10% . . . . . . . . . . . . . . . . 1

516 0082 000 . . . . . CAP, DISC .01UF 1KV GMV . . . . . . . . . . . . . . . 5

516 0205 000 . . . . . *CAP HV 500PF 5KV 20% . . . . . . . . . . . . . . . . . 1

516 0361 000 . . . . . CAP FEEDTHRU 1000PF . . . . . . . . . . . . . . . . . 2

516 0413 000 . . . . . CAP 10 PF 7.5KV 10% . . . . . . . . . . . . . . . . . . . . 1

520 0449 000 . . . . . CAP, AIR VAR 8-39PF 3KV . . . . . . . . . . . . . . . . 1

524 0155 000 . . . . . CAP 220UF 450V . . . . . . . . . . . . . . . . . . . . . . . . 2

524 0356 000 . . . . . CAP 36,000 UF 100V . . . . . . . . . . . . . . . . . . . . . 1

530 0088 000 . . . . . BRACKET, CAP, 2" ID . . . . . . . . . . . . . . . . . . . . 2

530 0092 000 . . . . . BRACKET, CAP, 3" ID . . . . . . . . . . . . . . . . . . . . 1

540 0580 000 . . . . . RES 51 OHM 2W 5% . . . . . . . . . . . . . . . . . . . . . 2

540 0663 000 . . . . . RES 150.0K OHM 2W 5% . . . . . . . . . . . . . . . . . 2

540 1490 000 . . . . . RES 10.0 OHM 275W 10% . . . . . . . . . . . . . . . . 1

542 0084 000 . . . . . RES 3K OHM 5% 12W . . . . . . . . . . . . . . . . . . . . 1

542 0127 000 . . . . . RES 500 OHM 5% 20W . . . . . . . . . . . . . . . . . . . 2

542 1601 000 . . . . . RES 3 OHM 155W 10% . . . . . . . . . . . . . . . . . . . 2

542 1604 000 . . . . . RES 100K OHM 160W 5% . . . . . . . . . . . . . . . . . 6

552 0403 000 . . . . . RHEO 7.5 OHM 150 W . . . . . . . . . . . . . . . . . . . . 1

552 0984 000 . . . . . RHEO 1500 OHM 25 W . . . . . . . . . . . . . . . . . . . 1

560 0055 000 . . . . . MOV 4500A 70J 250VAC . . . . . . . . . . . . . . . . . . 2

570 0324 000 . . . . . CONTACTOR 50A 4P . . . . . . . . . . . . . . . . . . . . 1

574 0436 000 . . . . . *RELAY, SS, AC, 10A, SPST . . . . . . . . . . . . . . . 4

574 0437 000 . . . . . RLY, SS 25A 240VAC . . . . . . . . . . . . . . . . . . . . 1

604 0052 000 . . . . . SW, PRECISION SPNC . . . . . . . . . . . . . . . . . . . 2

604 0397 000 . . . . . SW, PRESS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1

604 0893 000 . . . . . SW, INTLK DPDT . . . . . . . . . . . . . . . . . . . . . . . . 2

606 0522 000 . . . . . BREAKER, CKT 2A . . . . . . . . . . . . . . . . . . . . . . 1

606 0527 000 . . . . . BREAKER CKT 5 AMP . . . . . . . . . . . . . . . . . . . 2

606 0817 000 . . . . . BREAKER CKT 10 AMP . . . . . . . . . . . . . . . . . . 1

606 0866 000 . . . . . BREAKER, CIRCUIT 10A . . . . . . . . . . . . . . . . . . 1

610 0976 000 . . . . . HEADER, FILTERED 40 PIN . . . . . . . . . . . . . . . 2

614 0401 000 . . . . . TERM, INSULATED . . . . . . . . . . . . . . . . . . . . . . 3

614 0786 000 . . . . . TERM BD, 2C MODULAR 261 . . . . . . . . . . . . . . 7

614 0787 000 . . . . . TERM BD, 4C MODULAR 261 . . . . . . . . . . . . . . 2

620 0208 000 . . . . . ADPT, STRAIGHT N UG-30/U . . . . . . . . . . . . . . 1

620 0547 000 . . . . . ADAPTER BNC TO N UG201A/U . . . . . . . . . . . . 1

630 0184 000 . . . . . METER, 0-10VAC . . . . . . . . . . . . . . . . . . . . . . . 1

Rev. B: 07-10-96 888-2389-001

WARNING: Disconnect primary power prior to servicing.

#C002

#L103, #PA CAVITY

#L103, #PA CAVITY

B001

B002

#REAR DOOR

#PA CAVITY

#L105, #PA CAVITY

T007

T002

T005

T006

L003 L005

L107 L108

C011 #B002

C012 C013

C004

C006 C007 C008 C009 C010

C115 #PA CAVITY

C110, C111, #PA CAVITY

C117, #PA CAVITY

C107, #PA CAVITY

C014 C015

C001

#C014 #C015

#C001

R101, R102, #PA CAVITY

R023 R024

R025

R008

R001 R022

R003 R004

R012 R013 R014 R018 R019 R020

R015

R021

RV001 RV002

K002

K003 K004 K005 K007

K001

S001 S002

S005

S003 S004

CB006

CB002 CB003

CB005

CB004

J001 J002

#L107, #R101, #R102, #PA CAVITY

#4TB006 #3TB008

#TB006

#J101

#EMER BY-PASS

M004

6-7

632 1077 000. . . . . . METER PWR/VSWR, 4-1/2", W. . . . . . . . . . . . . . 1

632 1083 000. . . . . . METER MULTI, 2-1/2", W . . . . . . . . . . . . . . . . . . 1

636 0036 000. . . . . . METER, ELAPSED TIME 60HZ . . . . . . . . . . . . . 1

646 0665 000. . . . . . INSPECTION LABEL . . . . . . . . . . . . . . . . . . . . . 1

646 1031 000. . . . . . NAMEPLATE, HARRIS . . . . . . . . . . . . . . . . . . . . 1

646 1092 000. . . . . . FRAME, NAMEPLATE . . . . . . . . . . . . . . . . . . . . 1

646 1250 000. . . . . . LABEL H-136 . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1

646 1253 211. . . . . . LABEL, WARNING . . . . . . . . . . . . . . . . . . . . . . . 1

646 1483 002. . . . . . OVERLAY, CAB TRIM STRIPE . . . . . . . . . . . . . 1

648 0059 000. . . . . . DIAL TURNS COUNTING . . . . . . . . . . . . . . . . . . 2

650 0017 000. . . . . . KNOB RD SKIRT 1.25" DIA . . . . . . . . . . . . . . . . 2

650 0028 000. . . . . . KNOB RD SKIRT 1.135" DIA . . . . . . . . . . . . . . . 2

650 0102 000. . . . . . KNOB LOCK KL1251G . . . . . . . . . . . . . . . . . . . . 1

650 0279 000. . . . . . KNOB CONTROL 1.25" DIA . . . . . . . . . . . . . . . . 1

810 2264 001. . . . . . LOCKING PLATE . . . . . . . . . . . . . . . . . . . . . . . . 2

810 9885 003. . . . . . LIMIT SWITCH ROD . . . . . . . . . . . . . . . . . . . . . . 1

813 4999 027. . . . . . STDOFF 6-32X5/8 1/4 HEX . . . . . . . . . . . . . . . . 1

813 5000 013. . . . . . STDOFF 6-32X1-1/2 5/16 H . . . . . . . . . . . . . . . . 5

813 5000 031. . . . . . STDOFF 8-32X1-1/4 5/16 H . . . . . . . . . . . . . . . . 2

813 5001 071. . . . . . POST ALUM . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2

813 5007 026. . . . . . STDOFF 6-32X1/2 1/4 DIA . . . . . . . . . . . . . . . . . 1

813 5611 138. . . . . . STUD . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1

814 3570 001. . . . . . STRAP COND TERM . . . . . . . . . . . . . . . . . . . . . 2

814 7796 004. . . . . . HANDLE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1

814 7796 007. . . . . . HANDLE, GND HOOK . . . . . . . . . . . . . . . . . . . . 1

814 7797 001. . . . . . ROD, GND HOOK . . . . . . . . . . . . . . . . . . . . . . . . 1

814 7916 001. . . . . . HOOK, GND ROD . . . . . . . . . . . . . . . . . . . . . . . . 1

814 7917 001. . . . . . HOOK, 1/2IN RADIUS . . . . . . . . . . . . . . . . . . . . . 1

816 6141 002. . . . . . SUPPORT,6.8 IN. LG . . . . . . . . . . . . . . . . . . . . . 3

817 0002 001. . . . . . WASHER BLOCKER PLATE . . . . . . . . . . . . . . . 7

817 0718 001. . . . . . BUSHING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1

817 1375 001. . . . . . CLIP METER SUPPORT . . . . . . . . . . . . . . . . . . . 6

817 1594 003. . . . . . SPACER, CTRL PCB . . . . . . . . . . . . . . . . . . . . . 8

817 1594 004. . . . . . ROD, DOOR STOP . . . . . . . . . . . . . . . . . . . . . . . 1

817 1594 020. . . . . . INSULATION, DOOR . . . . . . . . . . . . . . . . . . . . . 2

817 1594 021. . . . . . INSULATION, DOOR . . . . . . . . . . . . . . . . . . . . . 1

817 1594 022. . . . . . ROD, FILAMENT . . . . . . . . . . . . . . . . . . . . . . . . . 2

817 1594 032. . . . . . SHAFT, CAP TUNE . . . . . . . . . . . . . . . . . . . . . . . 1

817 1594 034. . . . . . STRAP, NEUTRALIZING . . . . . . . . . . . . . . . . . . 1

817 1594 040. . . . . . SHIELD, BLWR RF . . . . . . . . . . . . . . . . . . . . . . . 1

817 1594 043. . . . . . FILTER, DOOR . . . . . . . . . . . . . . . . . . . . . . . . . . 1

817 1594 052. . . . . . LEAD, GRID . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1

817 1594 053. . . . . . ACTUATOR HIGH VOLTAGE SW . . . . . . . . . . . 1

817 1594 054. . . . . . INSULATOR, GRID TUNE . . . . . . . . . . . . . . . . . 2

817 2000 009. . . . . . SHAFT, KNOB . . . . . . . . . . . . . . . . . . . . . . . . . . . 1

817 2000 014. . . . . . ROD, GND . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1

817 2000 019. . . . . . STRAP, GROUND . . . . . . . . . . . . . . . . . . . . . . . . 1

817 2074 028. . . . . . SUPPORT, PLATE LINE . . . . . . . . . . . . . . . . . . . 2

817 2074 029. . . . . . STUD, ANODE PLATE . . . . . . . . . . . . . . . . . . . . 2

817 2074 034. . . . . . RUNNING SHEETS . . . . . . . . . . . . . . . . . . . . . . 0

817 2138 001. . . . . . STRAP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1

822 0715 001. . . . . . ANGLE, BEARING PNL . . . . . . . . . . . . . . . . . . . 1

822 0856 106. . . . . . SHIELD, RESISTOR . . . . . . . . . . . . . . . . . . . . . . 1

822 0994 001. . . . . . PLATE, COVER . . . . . . . . . . . . . . . . . . . . . . . . . 1

822 1004 001. . . . . . BLOCKER, FILAMENT . . . . . . . . . . . . . . . . . . . . 3

6-8

M003

M005

M006

#REAR DOOR

#B001

#A006

#C108, #C109, #C118 #PA CAVITY

888-2389-001

WARNING: Disconnect primary power prior to servicing.

#T006

#REAR DOOR

#A005

#R015

#A003

#FRONT ACCESS DOOR

#L103, #PA CAVITY

#C004

#GND HOOK

#GROUND HOOK

#GND HOOK

#GND HOOK

#GND HOOK

#T006

#L101, #L102, #PA CAVITY

#L102, #PA CAVITY

#A006

#REAR DOOR

#REAR DOOR

#C108, #C109, #PA CAVITY

#C107, #PA CAVITY

#L103, #PA CAVITY

#B001

#C107, #PA CAVITY

#REAR DOOR

#GND HOOK

#XV101, #PA CAVITY

#TUBE SOCKET

Rev. B: 07-10-96

829 4006 001 . . . . . STANDOFF . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

829 8567 001 . . . . . ANGLE SPARK GAP . . . . . . . . . . . . . . . . . . . . . 1

829 8568 001 . . . . . PLATE SPARK GAP . . . . . . . . . . . . . . . . . . . . . 1

829 9728 005 . . . . . HINGE, CTRL ACCESS PANEL . . . . . . . . . . . . 1

829 9728 024 . . . . . HINGE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1

829 9728 026 . . . . . SHIM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1

829 9728 032 . . . . . POST, MTG SCREEN RING . . . . . . . . . . . . . . . 4

829 9728 033 . . . . . POST, MTG GRID RING . . . . . . . . . . . . . . . . . . 4

829 9728 034 . . . . . PLATE, FILAMENT FEEDTHRU . . . . . . . . . . . . 2

829 9728 035 . . . . . INSULATOR, CAP MTG . . . . . . . . . . . . . . . . . . . 1

829 9728 038 . . . . . STRAP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

829 9728 039 . . . . . STRAP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

829 9728 040 . . . . . INSULATOR, GRID TUNE . . . . . . . . . . . . . . . . . 4

829 9728 044 . . . . . PLATE, PLT TUNE . . . . . . . . . . . . . . . . . . . . . . . 1

829 9728 049 . . . . . BRACKET, AIR SW . . . . . . . . . . . . . . . . . . . . . . 1

829 9728 053 . . . . . PLATE, GRID TUNE . . . . . . . . . . . . . . . . . . . . . . 1

829 9728 055 . . . . . PLATE GRID, COARSE TUNE . . . . . . . . . . . . . 1

829 9728 056 . . . . . BLOCKER, GRID . . . . . . . . . . . . . . . . . . . . . . . . 2

829 9728 058 . . . . . SHAFT, INNER PLT TUNE . . . . . . . . . . . . . . . . 1

829 9728 059 . . . . . SHAFT, PLATE TUNE . . . . . . . . . . . . . . . . . . . . 1

829 9728 064 . . . . . SCREW, GRID DRIVE . . . . . . . . . . . . . . . . . . . . 1

829 9728 065 . . . . . LEAD, FILAMENT . . . . . . . . . . . . . . . . . . . . . . . 1

829 9728 066 . . . . . LEAD, FILAMENT . . . . . . . . . . . . . . . . . . . . . . . 1

829 9728 095 . . . . . STRAP, FILAMENT . . . . . . . . . . . . . . . . . . . . . . 3

829 9728 096 . . . . . STRAP, FILAMENT . . . . . . . . . . . . . . . . . . . . . . 3

829 9728 100 . . . . . BLOCK, GRID TUNE . . . . . . . . . . . . . . . . . . . . . 1

829 9728 101 . . . . . BLOCK, INSULATED GRID . . . . . . . . . . . . . . . . 1

829 9728 104 . . . . . STRAP, GRID RING . . . . . . . . . . . . . . . . . . . . . . 1

829 9728 105 . . . . . STRAP, GRID TUNE . . . . . . . . . . . . . . . . . . . . . 1

829 9728 111 . . . . . BLOCK, SOCKET SPACER . . . . . . . . . . . . . . . . 4

829 9728 114 . . . . . STRAP, GRID . . . . . . . . . . . . . . . . . . . . . . . . . . . 1

829 9728 118 . . . . . ANGLE, GUIDE . . . . . . . . . . . . . . . . . . . . . . . . . 1

829 9745 004 . . . . . BLOCKER, FIL & CAT . . . . . . . . . . . . . . . . . . . . 2

839 6812 039 . . . . . INDUCTOR, COARSE TUNE . . . . . . . . . . . . . . . 1

839 6812 040 . . . . . BLOCKER, SCREEN . . . . . . . . . . . . . . . . . . . . . 1

839 6812 057 . . . . . ENCLOSURE, BLWR RF SHLD . . . . . . . . . . . . . 1

839 7832 065 . . . . . ANGLE, DOOR STOP . . . . . . . . . . . . . . . . . . . . 1

839 7832 066 . . . . . BLOCK DIAG, HT3.5/5/10FM . . . . . . . . . . . . . . . 0

843 4351 010 . . . . . COVER, FIXED REAR . . . . . . . . . . . . . . . . . . . . 1

843 4351 027 . . . . . BASE PLATE . . . . . . . . . . . . . . . . . . . . . . . . . . . 1

917 1104 001 . . . . . CONTACTOR END ASSY . . . . . . . . . . . . . . . . . 1

917 1594 026 . . . . . BLOCK ASSY, GRID TUNE . . . . . . . . . . . . . . . . 1

917 1957 001 . . . . . INSULATOR, BUSHING . . . . . . . . . . . . . . . . . . . 5

917 2074 001 . . . . . SHIELD, RF . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1

917 2074 015 . . . . . COUPLING, MOTOR . . . . . . . . . . . . . . . . . . . . . 1

917 2074 016 . . . . . SHAFT, REOSTAT . . . . . . . . . . . . . . . . . . . . . . . 1

917 2074 017 . . . . . SHAFT, PA TUNE . . . . . . . . . . . . . . . . . . . . . . . 2

917 2074 021 . . . . . PLATE, OUTPUT LOADING . . . . . . . . . . . . . . . 1

917 2405 003 . . . . . STRAP, L109 . . . . . . . . . . . . . . . . . . . . . . . . . . . 1

922 0856 001 . . . . . BAR . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1

922 0856 003 . . . . . REAR COVER . . . . . . . . . . . . . . . . . . . . . . . . . . 1

922 0856 005 . . . . . ANGLE, DECK MTG . . . . . . . . . . . . . . . . . . . . . . 2

922 0856 007 . . . . . SCREW, OUTPUT LOADING . . . . . . . . . . . . . . 1

922 0856 008 . . . . . BLOCK ASSY OUTPUT LOADING. . . . . . . . . . . 1

922 0856 009 . . . . . GEAR HOUSING . . . . . . . . . . . . . . . . . . . . . . . . 1

Rev. B: 07-10-96 888-2389-001

WARNING: Disconnect primary power prior to servicing.

#XV101, #PA CAVITY

#A006

#XV101, #PA CAVITY

#XV101, #PA CAVITY

#C107, #PA CAVITY

#XV101, #PA CAVITY

#XV101, #PA CAVITY

#L101, #L102, #PA CAVITY

#C112, #PA CAVITY

#S005

#L102, #PA CAVITY

#L101, #PA CAVITY

#C101, #C102, #PA CAVITY

#C112, #PA CAVITY

#L102, #PA CAVITY

#XU101, #PA CAVITY

#XV101, #PA CAVITY

#T004

#T004

8L102, #PA CAVITY

#L102, #PA CAVITY

#L102, #PA CAVITY

#L102, #PA CAVITY

#XV101, #PA CAVITY

#C107

#XV101, #PA CAVITY

#L101, #PA CAVITY

#C105, #PA CAVITY

#B001

#PA CAVITY

#XV101, #PA CAVITY

#C112, #PA CAVITY

#L102, #PA CAVITY

#C105, #C118 #PA CAVITY

#PA CAVITY

#B002

#R015

#PA CAVITY INPUT MATCH

#1S8

L109

#L105, #PA CAVITY

#PA CAVITY

#PA CAVITY

#L106, #PA CAVITY

#L105, #L106, #PA CAVITY

#L105, #PA CAVITY

6-9

922 0856 010. . . . . . INSULATOR, BUSHING . . . . . . . . . . . . . . . . . . . 8

922 0856 015. . . . . . BEARING PLATE, PLATE TUNE. . . . . . . . . . . . . 1

922 0856 030. . . . . . ASSY, HV INTERLOCK SW. . . . . . . . . . . . . . . . 1

922 0856 031. . . . . . MOUNT, SWITCH ASSY. . . . . . . . . . . . . . . . . . . 1

922 0856 032. . . . . . BRACKET, EXCITER MTG. . . . . . . . . . . . . . . . . 2

922 0856 033. . . . . . ANGLE, IPA SUPPORT . . . . . . . . . . . . . . . . . . . 1

922 0856 035. . . . . . ANGLE, DECK MTG. . . . . . . . . . . . . . . . . . . . . . 2

922 0856 036. . . . . . STUD, ANODE PLATE . . . . . . . . . . . . . . . . . . . . 2

922 0856 037. . . . . . DIELECTRIC, ANODE . . . . . . . . . . . . . . . . . . . . 2

922 0856 039. . . . . . SUPPORT, DRIVE SCREW . . . . . . . . . . . . . . . . 1

922 0856 042. . . . . . ANGLE, ENCLOSURE SUPPORT . . . . . . . . . . . 1

922 0856 043. . . . . . ANGLE, PLATE MTG. . . . . . . . . . . . . . . . . . . . . . 1

922 0856 045. . . . . . SHAFT, R. ANGLE DRIVE . . . . . . . . . . . . . . . . . 1

922 0856 049. . . . . . SHIELD, HV SWITCH . . . . . . . . . . . . . . . . . . . . . 1

922 0856 055. . . . . . STRAP, GND . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1

922 0856 056. . . . . . PLATE, REOSTAT MTG. . . . . . . . . . . . . . . . . . . 1

922 0856 057. . . . . . INDUCTOR, FILAMENT . . . . . . . . . . . . . . . . . . . 2

922 0856 059. . . . . . BRACKET, SWITCH . . . . . . . . . . . . . . . . . . . . . . 1

922 0856 060. . . . . . SUPPORT, SHAFT . . . . . . . . . . . . . . . . . . . . . . . 1

922 0856 067. . . . . . POST, RESISTOR MTG. . . . . . . . . . . . . . . . . . . 1

922 0856 092. . . . . . SHAFT, R. ANGLE DRIVE . . . . . . . . . . . . . . . . . 1

922 0856 100. . . . . . GUSSET, CABINET . . . . . . . . . . . . . . . . . . . . . . 2

922 1052 001. . . . . . PLATE CHOKE . . . . . . . . . . . . . . . . . . . . . . . . . . 1

922 1231 001. . . . . . SHIELD, RESISTOR . . . . . . . . . . . . . . . . . . . . . . 1

922 1239 001. . . . . . PLATE, C118 FEED THRU . . . . . . . . . . . . . . . . . 1

929 9135 488. . . . . . ASSY, CONTACT RING . . . . . . . . . . . . . . . . . . . 1

929 9135 489. . . . . . ASSY, CONTACT RING . . . . . . . . . . . . . . . . . . . 1

939 6812 019. . . . . . CONTACT, SCREEN . . . . . . . . . . . . . . . . . . . . . 1

939 6812 020. . . . . . CONTACT, GRID . . . . . . . . . . . . . . . . . . . . . . . . 1

939 7832 002. . . . . . HOUSING, RF SHIELD . . . . . . . . . . . . . . . . . . . . 1

939 7832 006. . . . . . CONNECTOR, ANODE . . . . . . . . . . . . . . . . . . . . 1

939 7832 009. . . . . . PLATE, SCREEN BYPASS . . . . . . . . . . . . . . . . . 1

939 7832 010. . . . . . CHIMNEY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1

939 7832 014. . . . . . PANEL, L.SIDE, CONT. ENCL. . . . . . . . . . . . . . . 1

939 7832 023. . . . . . SUPPORT, IPA MODULE . . . . . . . . . . . . . . . . . . 1

939 7832 042. . . . . . PANEL, REAR DOOR . . . . . . . . . . . . . . . . . . . . . 1

939 7832 043. . . . . . PANEL, DOOR . . . . . . . . . . . . . . . . . . . . . . . . . . 1

939 7832 044. . . . . . SAFETY COVER . . . . . . . . . . . . . . . . . . . . . . . . . 1

939 7832 047. . . . . . PLATE, ANODE CONNECTION . . . . . . . . . . . . . 1

939 7832 048. . . . . . PLATE, ANODE BLOCKER . . . . . . . . . . . . . . . . 1

939 7832 051. . . . . . COVER, REGULATOR . . . . . . . . . . . . . . . . . . . . 1

939 7832 052. . . . . . SHIELD, REOSTAT . . . . . . . . . . . . . . . . . . . . . . . 1

939 7832 069. . . . . . PANEL, BREAKER MTG. . . . . . . . . . . . . . . . . . . 1

939 7832 070. . . . . . SHIELD, RESISTOR . . . . . . . . . . . . . . . . . . . . . . 1

939 7832 073. . . . . . COVER, FEED THRU . . . . . . . . . . . . . . . . . . . . . 1

939 7832 078. . . . . . PLATE, MOTOR MTG. . . . . . . . . . . . . . . . . . . . . 1

943 4827 005. . . . . . BLANK, PNL 8.72 X 19 . . . . . . . . . . . . . . . . . . . . 1

943 4827 050. . . . . . PANEL, RACK . . . . . . . . . . . . . . . . . . . . . . . . . . . 1

943 4979 002. . . . . . DECK . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1

943 4979 003. . . . . . TOP, PA ENCLOSURE . . . . . . . . . . . . . . . . . . . . 1

943 4979 004. . . . . . BACK, PA TANK . . . . . . . . . . . . . . . . . . . . . . . . . 1

943 4979 007. . . . . . FRONT PANEL . . . . . . . . . . . . . . . . . . . . . . . . . . 1

943 4979 011. . . . . . PNL, CONTROLLER . . . . . . . . . . . . . . . . . . . . . . 1

943 4979 015. . . . . . CONTROL PANEL . . . . . . . . . . . . . . . . . . . . . . . 1

943 4979 016. . . . . . CABINET WELDMENT, HT-10FM . . . . . . . . . . . . 1

6-10

#C113, #PA CAVITY

#C112

S006

#S006

A001 MTG

#A007

CABINET

#C113, #PA CAVITY

#L105, #L106, #PA CAVITY

#CABINET

#PA CAVITY

#CAVITY, #R/A DRIVE

#S006

#R015

L111, L112, #PA CAVITY

#S003

#PA CAVITY

#R012

888-2389-001

WARNING: Disconnect primary power prior to servicing.

SHIELD FOR R003 ON A002

C118 #PA CAVITY

#XV101, #PA CAVITY

#XV101, #PA CAVITY

#XV101, #PA CAVITY

#XV101, #PA CAVITY

#PA CAVITY

#XV001, #PA CAVITY

#C105 #PA CAVITY

#XV101 #PA CAVITY

#A008 #A003

#CABINET

#CABINET

#CABINET

#C113 #PA CAVITY

#C113, #PA CAVITY

#A003

#R015

A002

#PA CAVITY

#B001

#PA CAVITY

#PA CAVITY

#PA CAVITY

#FRONT PNL

#CABINET

#FRONT PNL

Rev. B: 07-10-96

943 4979 017 . . . . . ASS’Y., DECK . . . . . . . . . . . . . . . . . . . . . . . . . . 1

943 4979 018 . . . . . ENCLOSURE, CONTROLLER . . . . . . . . . . . . . . 1

943 4979 025 . . . . . METER PANEL ASSY . . . . . . . . . . . . . . . . . . . . 1

952 9165 001 . . . . . ASSY, CHASSIS . . . . . . . . . . . . . . . . . . . . . . . . 1

952 9165 004 . . . . . SHIELD, INNER LEFT . . . . . . . . . . . . . . . . . . . . 1

952 9165 005 . . . . . SHIELD, INNER RIGHT . . . . . . . . . . . . . . . . . . . 1

992 5620 001 . . . . . DIR COUPLER ASSY . . . . . . . . . . . . . . . . . . . . . 1

992 6617 002 . . . . . SWITCH BOARD, A5 . . . . . . . . . . . . . . . . . . . . . 1

992 6619 002 . . . . . * PWB, XMTR CONTROL A6 * . . . . . . . . . . . . . . 1

992 7040 001 . . . . . CUST IN-FACE/CONT PS, A4 . . . . . . . . . . . . . . 1

992 7044 001 . . . . . AUXILLARY BOARD,A2 . . . . . . . . . . . . . . . . . . . 1

992 7070 001 . . . . . IPA REGULATOR A3 . . . . . . . . . . . . . . . . . . . . . 1

992 7073 001 . . . . . 300W IPA MODULE A8 . . . . . . . . . . . . . . . . . . . 1

992 8309 001 . . . . . FM XMTR CABLE PKG . . . . . . . . . . . . . . . . . . . 1

999 2469 002 . . . . . HARDWARE LIST . . . . . . . . . . . . . . . . . . . . . . . 1

CABINET

#A006

#FRONT PNL

#PA CAVITY

CABINET

CABINET

DC101 #PA CAVITY

A005

A006

A004

A002

A003

A008

Table 6-6. DIR COUPLER ASSY - 992 5620 001

HARRIS P/N DESCRIPTION QTY/UM REF. SYMBOLS/EXPLANATIONS

839 5303 001 . . . . . SCHEM, LOW PASS FILTER . . . . . . . . . . . . . . 0

839 5156 001 . . . . . PWB, LPF/DIRECT COUPLER . . . . . . . . . . . . 1.0

813 4999 043 . . . . . STDOFF 4-40X.295 1/4 HEX . . . . . . . . . . . . . . 8.0

829 7210 001 . . . . . REF DWG., COIL HEIGHT . . . . . . . . . . . . . . . . . 0

517 0053 000 . . . . . CAP TRIMMER 0.8-23.0 PF . . . . . . . . . . . . . . . . 2

517 0052 000 . . . . . CAP TRIMMER 0.8-11.0PF . . . . . . . . . . . . . . . 1.0

500 0817 000 . . . . . CAP 47PF 500V 5% . . . . . . . . . . . . . . . . . . . . . . 1

C001 C003

C2

C005

C006 500 0833 000 . . . . . CAP 390PF 500V 5% . . . . . . . . . . . . . . . . . . . . . 1

500 0842 000 . . . . . CAP, MICA 820PF 300V 5% . . . . . . . . . . . . . . 2.0

518 0104 000 . . . . . CAP, VAR 5.5-18PF . . . . . . . . . . . . . . . . . . . . . . 1

516 0235 000 . . . . . CAP FEED-THRU 1000PF . . . . . . . . . . . . . . . . 3.0

C10 C7

C12

C13 C14 C15

CR1 CR2 384 0321 000 . . . . . DIODE 5082-2800/1N5711 . . . . . . . . . . . . . . . . 2.0

612 0233 000 . . . . . RECEPTACLE N UG-58A/U . . . . . . . . . . . . . . . 2.0

829 7108 001 . . . . . INDUCTOR, 2-1/2 TURN . . . . . . . . . . . . . . . . . 3.0

829 7108 002 . . . . . INDUCTOR, 1-1/2 TURN . . . . . . . . . . . . . . . . . 1.0

J1 J2

L1 L2 L4

L3

L5 L6 494 0376 000 . . . . . CHOKE RF 0.22UH . . . . . . . . . . . . . . . . . . . . . . 2

494 0377 000 . . . . . CHOKE RF 0.27UH . . . . . . . . . . . . . . . . . . . . . . 1

540 0301 000 . . . . . RES 51.0 OHM 1W 5% . . . . . . . . . . . . . . . . . . . 1

550 0621 000 . . . . . POT, 200 OHM .5W 10% . . . . . . . . . . . . . . . . . . 1

L7

R001

R002

R3 540 0308 000 . . . . . RES 100.0 OHM 1W 5% . . . . . . . . . . . . . . . . . 1.0

843 3817 001 . . . . . COVER LPF / DIR COUPLER . . . . . . . . . . . . . 1.0

813 4999 024 . . . . . STDOFF 6-32X3/8 1/4 HEX . . . . . . . . . . . . . . . 6.0

999 2107 001 . . . . . WIRE LIST . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1.0

500 1320 000 . . . . . CAP 10PF 500V 10% . . . . . . . . . . . . . . . . . . . . . 2

526 0097 000 . . . . . CAP 47UF 35V 20% . . . . . . . . . . . . . . . . . . . . . . 2

500 0807 000 . . . . . CAP 18PF 500V 5% . . . . . . . . . . . . . . . . . . . . . . 1

500 0809 000 . . . . . CAP 22PF 500V 5% . . . . . . . . . . . . . . . . . . . . . . 1

548 2400 258 . . . . . RES 392 OHM 1/2W 1% . . . . . . . . . . . . . . . . . . 1

548 2400 318 . . . . . RES 1.5K OHM 1/2W 1% . . . . . . . . . . . . . . . . . . 1

548 2400 285 . . . . . RES 750 OHM 1/2W 1% . . . . . . . . . . . . . . . . . . 1

999 1902 001 . . . . . HARDWARE LIST . . . . . . . . . . . . . . . . . . . . . . . 1

C004 C011

C016 C017

C008

C009

R004

R005

R006

300 2108 000 . . . . . SCR, 6-32 X 1 . . . . . . . . . . . . . . . . . . . . . . . . . . . 1

917 2162 001 . . . . . SPACER . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1

404 0250 000 . . . . . HEAT SINK FOR TO-5 CASE . . . . . . . . . . . . . . 1

Rev. B: 07-10-96 888-2389-001

WARNING: Disconnect primary power prior to servicing.

6-11

Table 6-7. SWITCH BOARD, A5 - 992 6617 002

HARRIS P/N DESCRIPTION QTY/UM REF. SYMBOLS/EXPLANATIONS

358 2997 000. . . . . . END PLATE,236 TERM MODULE . . . . . . . . . . . . 1 #TB001

396 0182 000. . . . . . LAMP, .2A 6.3V 381 . . . . . . . . . . . . . . . . . . . . . . 1

396 0186 000. . . . . . LAMP, 28V 385 . . . . . . . . . . . . . . . . . . . . . . . . . . 1

DS001

DS003

540 0605 000. . . . . . RES 560.0 OHM 2W 5% . . . . . . . . . . . . . . . . . . . 1

548 2400 077. . . . . . RES 6.19 OHM 1/2W 1% . . . . . . . . . . . . . . . . . . 1

598 0169 000. . . . . . SWITCH CAP, PB, RED . . . . . . . . . . . . . . . . . . . 2

598 0170 000. . . . . . SWITCH CAP, PB, GR . . . . . . . . . . . . . . . . . . . . 2

R002

R001

#S002 #S004

#S001 #S003

S001 S002 S003 S004

#TB001

598 0436 000. . . . . . SW BASE SPST NO MOM . . . . . . . . . . . . . . . . . 4

614 0790 000. . . . . . TERM MODULE,1C PC MTG 236 . . . . . . . . . . . . 9

839 7832 028. . . . . . SCHEM, 3PH HT10FM OVERALL . . . . . . . . . . . . 0

839 7832 029. . . . . . SCHEM, HT3.5/5FM OVERALL . . . . . . . . . . . . . 0

839 7832 049. . . . . . PWB, SWITCH BOARD . . . . . . . . . . . . . . . . . . . 1

839 7873 054. . . . . . SCHEM, HT7/HT10FM 1PH . . . . . . . . . . . . . . . . 0

Table 6-8. * PWB, XMTR CONTROL A6 * - 992 6619 002

HARRIS P/N DESCRIPTION QTY/UM REF. SYMBOLS/EXPLANATIONS

000 0000 002. . . . . . APPEARS ON HIGHER LEVEL . . . . . . . . . . . . . 0 BT001 R008

358 2177 000. . . . . . SPACER, LED MOUNT .380 LG . . . . . . . . . . . . 17 #DS001 #DS002 #DS003 #DS004 #DS005 #DS006

#DS007 #DS008 #DS009 #DS010 #DS011 #DS012

358 2836 000. . . . . . BATTERY HOLDER 9 VOLT . . . . . . . . . . . . . . . . 1

380 0125 000. . . . . . XSTR, NPN 2N4401 . . . . . . . . . . . . . . . . . . . . . . 1

382 0359 000. . . . . . IC, 7815 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1

382 0360 000. . . . . . IC, 7915 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1

#DS013 #DS014 #DS015 #DS016 #DS017

XBT1

Q001

U001

382 0419 000. . . . . . IC, 74C14 ESD . . . . . . . . . . . . . . . . . . . . . . . . . . 1

382 0465 000. . . . . . IC, 74C74 ESD . . . . . . . . . . . . . . . . . . . . . . . . . . 6

382 0498 000. . . . . . IC, 74C20 ESD . . . . . . . . . . . . . . . . . . . . . . . . . . 2

382 0521 000. . . . . . IC, 339 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2

U002

U017

U007 U009 U012 U014 U022 U025

U020 U032

382 0594 000. . . . . . IC TL074ACN ESD . . . . . . . . . . . . . . . . . . . . . . . 4

382 0646 000. . . . . . * IC DAC0808 ESD . . . . . . . . . . . . . . . . . . . . . . . 1

382 1011 000. . . . . . IC, 14541/4541 . . . . . . . . . . . . . . . . . . . . . . . . . . 3

382 1014 000. . . . . . IC, 74C193/40193BE ESD . . . . . . . . . . . . . . . . . 2

U003 U010

U005 U011 U016 U026

U031

U018 U019 U023

382 1015 000. . . . . . IC, CD4048B ESD . . . . . . . . . . . . . . . . . . . . . . . . 2

382 1016 000. . . . . . IC, MM74C240N ESD . . . . . . . . . . . . . . . . . . . . . 4

382 1017 000. . . . . . IC, MM74C244N ESD . . . . . . . . . . . . . . . . . . . . . 2

382 1070 000. . . . . . IC, ILQ-1 OPTO-ISOLATOR . . . . . . . . . . . . . . . . 7

U021 U027

U029 U030

U004 U006 U013 U015

U008 U028

382 1072 000. . . . . . IC, 14175/40175 ESD . . . . . . . . . . . . . . . . . . . . . 1

384 0205 000. . . . . . DIODE SILICON 1N914/4148 . . . . . . . . . . . . . . 75

U033 U034 U035 U036 U037 U038

U039

U024

CR004 CR008 CR009 CR010 CR011 CR012

CR013 CR014 CR015 CR016 CR017 CR018

CR019 CR020 CR021 CR022 CR023 CR025

CR026 CR028 CR029 CR030 CR031 CR032

CR033 CR034 CR035 CR036 CR037 CR038

CR039 CR040 CR041 CR042 CR043 CR044

CR045 CR046 CR047 CR048 CR049 CR050

CR051 CR052 CR053 CR054 CR055 CR056

CR057 CR058 CR059 CR060 CR061 CR062

CR063 CR064 CR065 CR066 CR067 CR068

CR069 CR070 CR071 CR072 CR073 CR074

CR075 CR076 CR077 CR078 CR079 CR080

CR081 CR082 CR084

6-12 888-2389-001

WARNING: Disconnect primary power prior to servicing.

Rev. B: 07-10-96

384 0431 000 . . . . . RECT. 1N4001 . . . . . . . . . . . . . . . . . . . . . . . . . . 7

384 0610 000 . . . . . LED, GREEN . . . . . . . . . . . . . . . . . . . . . . . . . . . 3

384 0611 000 . . . . . LED, RED . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

384 0679 000 . . . . . LED, YELLOW . . . . . . . . . . . . . . . . . . . . . . . . . . 1

384 0720 000 . . . . . TRANSZORB 1N6377 15V 5W . . . . . . . . . . . . . 2

386 0300 000 . . . . . ZENER, 1N4730A 3.9V . . . . . . . . . . . . . . . . . . . 1

404 0674 000 . . . . . SOCKET 14 PIN DIP (D-L) . . . . . . . . . . . . . . . . 18

404 0675 000 . . . . . SOCKET IC 16 CONT . . . . . . . . . . . . . . . . . . . 22

404 0698 000 . . . . . HEAT SINK FOR TO-220 CASE . . . . . . . . . . . . . 1

404 0704 000 . . . . . SOCKET IC 20 PIN . . . . . . . . . . . . . . . . . . . . . . 6

506 0230 000 . . . . . CAP .001UF 100VAC 5% . . . . . . . . . . . . . . . . . . 1

506 0232 000 . . . . . CAP .01UF 100V 5% . . . . . . . . . . . . . . . . . . . . . 2

506 0233 000 . . . . . CAP .1UF 63V 5% . . . . . . . . . . . . . . . . . . . . . . . 2

506 0239 000 . . . . . CAP .022UF 100V 5% . . . . . . . . . . . . . . . . . . . . 2

506 0244 000 . . . . . CAP .22UF 63V 5% . . . . . . . . . . . . . . . . . . . . . . 1

516 0054 000 . . . . . CAP, DISC .001UF 1KV 10% . . . . . . . . . . . . . . . 1

516 0453 000 . . . . . CAP .1UF 100V 20% X7R . . . . . . . . . . . . . . . . 78

522 0548 000 . . . . . CAP 10UF 50V ELECTROLYTIC . . . . . . . . . . . . 2

522 0570 000 . . . . . CAP 2.2UF 50V . . . . . . . . . . . . . . . . . . . . . . . . . 2

522 0573 000 . . . . . CAP 47UF 50V 20% . . . . . . . . . . . . . . . . . . . . . . 1

526 0049 000 . . . . . CAP 6.8UF 35V 20% . . . . . . . . . . . . . . . . . . . . . 4

526 0050 000 . . . . . CAP 1UF 35V 20% . . . . . . . . . . . . . . . . . . . . . . . 1

526 0097 000 . . . . . CAP 47UF 35V 20% . . . . . . . . . . . . . . . . . . . . . . 1

540 0308 000 . . . . . RES 100.0 OHM 1W 5% . . . . . . . . . . . . . . . . . . 1

540 1357 000 . . . . . RES NETWORK 1000 OHM 2% . . . . . . . . . . . . 2

540 1366 000 . . . . . RES NETWORK 100 OHM 2% . . . . . . . . . . . . . 3

540 1367 000 . . . . . RES NETWORK 2000 OHM 2% . . . . . . . . . . . . 4

548 2400 042 . . . . . RES 2.67 OHM 1/2W 1% . . . . . . . . . . . . . . . . . . 1

548 2400 201 . . . . . RES 100 OHM 1/2W 1% . . . . . . . . . . . . . . . . . 13

548 2400 226 . . . . . RES 182 OHM 1/2W 1% . . . . . . . . . . . . . . . . . . 1

548 2400 242 . . . . . RES 267 OHM 1/2W 1% . . . . . . . . . . . . . . . . . . 1

548 2400 269 . . . . . RES 511 OHM 1/2W 1% . . . . . . . . . . . . . . . . . . 1

548 2400 301 . . . . . RES 1K OHM 1/2W 1% . . . . . . . . . . . . . . . . . . 20

Rev. B: 07-10-96

CR001 CR002 CR003 CR005 CR006 CR007

CR083

DS001 DS002 DS014

DS003 DS004 DS005 DS006 DS007 DS008

DS009 DS010 DS011 DS012 DS013 DS015

DS016

DS017

CR085 CR086

CR027

XU003 XU005 XU007 XU009 XU010 XU011

XU012 XU014 XU016 XU017 XU018 XU019

XU020 XU022 XU023 XU025 XU026 XU032

XU021 XU024 XU027 XU029 XU030 XU031

XU033 XU034 XU035 XU036 XU037 XU038

XU039 XR181 XR182 XR185 XR187 XR189

XR191 XR193 XR195 XR197

#U1

XU004 XU006 XU008 XU013 XU015 XU028

C038

C021 C058

C049 C100

C034 C044

C019

C026

C001 C004 C007 C008 C009 C010

C011 C012 C013 C014 C015 C016

C017 C018 C020 C022 C023 C024

C025 C027 C028 C029 C030 C031

C032 C033 C035 C036 C037 C039

C040 C041 C042 C043 C047 C052

C053 C056 C057 C059 C060 C061

C062 C063 C064 C065 C066 C067

C068 C069 C070 C071 C072 C073

C074 C075 C076 C077 C078 C079

C080 C082 C083 C085 C086 C087

C088 C089 C090 C091 C092 C093

C094 C095 C096 C097 C098 C099

C002 C005

C003 C006

C084

C046 C048 C054 C055

C045

C050

R002

R191 R197

R181 R185 R195

R182 R187 R189 R193

R225

R004 R010 R015 R018 R021 R026

R032 R038 R043 R048 R051 R218

R227

R233

R226

R128

R007 R009 R013 R014 R028 R030

888-2389-001

WARNING: Disconnect primary power prior to servicing.

6-13

548 2400 312. . . . . . RES 1.3K OHM 1/2W 1% . . . . . . . . . . . . . . . . . 17

548 2400 313. . . . . . RES 1.33K OHM 1/2W 1% . . . . . . . . . . . . . . . . . 1

548 2400 318. . . . . . RES 1.5K OHM 1/2W 1% . . . . . . . . . . . . . . . . . . 3

548 2400 330. . . . . . RES 2K OHM 1/2W 1% . . . . . . . . . . . . . . . . . . . . 4

548 2400 351. . . . . . RES 3.32K OHM 1/2W 1% . . . . . . . . . . . . . . . . . 1

548 2400 366. . . . . . RES 4.75K OHM 1/2W 1% . . . . . . . . . . . . . . . . . 2

548 2400 369. . . . . . RES 5.11K OHM 1/2W 1% . . . . . . . . . . . . . . . . . 5

548 2400 373. . . . . . RES 5.62K OHM 1/2W 1% . . . . . . . . . . . . . . . . . 1

548 2400 385. . . . . . RES 7.5K OHM 1/2W 1% . . . . . . . . . . . . . . . . . . 2

548 2400 393. . . . . . RES 9.09K OHM 1/2W 1% . . . . . . . . . . . . . . . . . 1

548 2400 396. . . . . . RES 9.76K OHM 1/2W 1% . . . . . . . . . . . . . . . . . 1

548 2400 401. . . . . . RES 10K OHM 1/2W 1% . . . . . . . . . . . . . . . . . . 45

548 2400 409. . . . . . RES 12.1K OHM 1/2W 1% . . . . . . . . . . . . . . . . . 1

548 2400 418. . . . . . RES 15K OHM 1/2W 1% . . . . . . . . . . . . . . . . . . . 6

548 2400 430. . . . . . RES 20K OHM 1/2W 1% . . . . . . . . . . . . . . . . . . . 3

548 2400 437. . . . . . RES 23.7K OHM 1/2W 1% . . . . . . . . . . . . . . . . . 1

548 2400 442. . . . . . RES 26.7K OHM 1/2W 1% . . . . . . . . . . . . . . . . . 1

548 2400 447. . . . . . RES 30.1K OHM 1/2W 1% . . . . . . . . . . . . . . . . . 2

548 2400 462. . . . . . RES 43.2K OHM 1/2W 1% . . . . . . . . . . . . . . . . . 3

548 2400 466. . . . . . RES 47.5K OHM 1/2W 1% . . . . . . . . . . . . . . . . . 1

548 2400 469. . . . . . RES 51.1K OHM 1/2W 1% . . . . . . . . . . . . . . . . . 3

548 2400 481. . . . . . RES 68.1K OHM 1/2W 1% . . . . . . . . . . . . . . . . . 1

548 2400 493. . . . . . RES 90.9K OHM 1/2W 1% . . . . . . . . . . . . . . . . . 1

548 2400 501. . . . . . RES 100K OHM 1/2W 1% . . . . . . . . . . . . . . . . . 50

548 2400 526. . . . . . RES 182K OHM 1/2W 1% . . . . . . . . . . . . . . . . . . 1

548 2400 530. . . . . . RES 200K OHM 1/2W 1% . . . . . . . . . . . . . . . . . . 1

548 2400 601. . . . . . RES 1MEG OHM 1/2W 1% . . . . . . . . . . . . . . . . . 1

548 2400 618. . . . . . RES 1.5MEG OHM 1/2W 1% . . . . . . . . . . . . . . . 2

548 2400 630. . . . . . RES 2MEG OHM 1/2W 1% . . . . . . . . . . . . . . . . . 1

550 0949 000. . . . . . POT 100K OHM 1/2W 10% . . . . . . . . . . . . . . . . . 6

550 0956 000. . . . . . POT 2000 OHM 1/2W 10% . . . . . . . . . . . . . . . . . 1

550 0958 000. . . . . . POT 10K OHM 1/2 W 10% . . . . . . . . . . . . . . . . . 1

550 1028 000. . . . . . POT 20 OHM 1/2W 10% . . . . . . . . . . . . . . . . . . . 1

600 0601 000. . . . . . SW, ROTARY 1 POLE 12 POS . . . . . . . . . . . . . 1

600 0608 000. . . . . . SW, RTTY 2P 6 POS PC . . . . . . . . . . . . . . . . . . 1

6-14

R046 R047 R057 R108 R134 R136

R141 R147 R184 R186 R188 R190

R229 R230

R001 R003 R074 R076 R078 R080

R083 R086 R088 R092 R124 R132

R153 R177 R198 R199 R221

R079

R107 R155 R158

R192 R194 R196 R231

R077

R024 R175

R027 R033 R140 R146 R174

R129

R130 R131

R054

R056

R006 R016 R025 R031 R049 R052

R060 R063 R066 R069 R070 R071

R072 R081 R084 R095 R096 R103

R109 R110 R113 R115 R118 R126

R138 R143 R144 R150 R152 R205

R206 R207 R208 R209 R210 R211

R212 R213 R214 R215 R216 R217

R220 R228 R232

R105

R058 R064 R067 R117 R200 R223

R020 R035 R036

R104

R098

R044 R234

R029 R034 R094

R040

R023 R097 R176

R017

R093

R005 R012 R019 R022 R037 R039

R041 R045 R050 R053 R089 R099

R100 R102 R106 R114 R119 R120

R122 R127 R135 R137 R139 R142

R145 R148 R151 R156 R157 R159

R160 R161 R162 R163 R164 R165

R166 R167 R168 R169 R170 R171

R172 R178 R179 R180 R202 R203

R204 R224

R061

R011

R055

R116 R121

R125

R062 R065 R068 R111 R112 R219

R201

R059

R042

S003

S005

888-2389-001

WARNING: Disconnect primary power prior to servicing.

Rev. B: 07-10-96

604 0903 000 . . . . . SWITCH, TGL SPDT MOM OFF . . . . . . . . . . . . 3

604 0904 000 . . . . . SW, TGL SPDT . . . . . . . . . . . . . . . . . . . . . . . . . 1

604 0905 000 . . . . . SW, PB MOMENTARY . . . . . . . . . . . . . . . . . . . . 2

604 0979 000 . . . . . SW, THUMBWHEEL SP-16 POS . . . . . . . . . . . . 1

610 0679 000 . . . . . PLUG, SHORTING, .25" CTRS . . . . . . . . . . . . . . 4

610 0854 000 . . . . . HEADER, 40 PIN PC RIBBON . . . . . . . . . . . . . . 2

839 7832 019 . . . . . SCHEM, XMTR CONTROL . . . . . . . . . . . . . . . . 0

943 4979 009 . . . . . XMTR CONTROL BOARD . . . . . . . . . . . . . . . . . 1

999 2371 002 . . . . . HARDWARE LIST . . . . . . . . . . . . . . . . . . . . . . . 1

S007 S008 S009

S010

S002 S006

S004

P001 P002 P003 P005

J001 J002

Table 6-9. XMTR CONTROL BOARD - 943 4979 009

HARRIS P/N DESCRIPTION QTY/UM REF. SYMBOLS/EXPLANATIONS

843 4979 009 . . . . . PWB, XMTR CONTROL . . . . . . . . . . . . . . . . . . . 1

354 0310 000 . . . . . TERM, TUR SLDR . . . . . . . . . . . . . . . . . . . . . . 17 TP001 TP002 TP003 TP004 TP005 TP006

TP007 TP008 TP009 TP010 TP011 TP012

612 0904 000 . . . . . JACK, PC MT GOLD PLATED . . . . . . . . . . . . . 13

354 0309 000 . . . . . TERM SOLDER . . . . . . . . . . . . . . . . . . . . . . . . . 4

TP013 TP016 TP017 TP018 TP019

J001-1 J001-2 J001-3 J002A-1 J002A-2 J002B-1

J002B-2 J003-1 J003-2 J003-3 J005-1 J005-2

J005-3

#R008 TP014 TP015

Table 6-10. CUST IN-FACE/CONT PS, A4 - 992 7040 001

HARRIS P/N DESCRIPTION QTY/UM REF. SYMBOLS/EXPLANATIONS

358 1726 000 . . . . . SPRING, HOLD DOWN . . . . . . . . . . . . . . . . . . . 1 #K001

358 2144 000 . . . . . BRACKET, XFMR MTG . . . . . . . . . . . . . . . . . . . 2 #T001 #T002

358 2997 000 . . . . . END PLATE,236 TERM MODULE . . . . . . . . . . . 3

384 0020 000 . . . . . RECTIFIER IN4005 . . . . . . . . . . . . . . . . . . . . . . 4

404 0161 000 . . . . . SOCKET RELAY 9KH2 . . . . . . . . . . . . . . . . . . . 1

#TB001 #TB002 #TB003

CR001 CR002 CR003 CR004

#K001

472 1186 000 . . . . . XFMR, PWR 28V 800MA . . . . . . . . . . . . . . . . . . 2

522 0547 000 . . . . . * CAP 3300UF 40V -10/+50% . . . . . . . . . . . . . . . 2

540 0312 000 . . . . . RES 150.0 OHM 1W 5% . . . . . . . . . . . . . . . . . . 1

548 2400 330 . . . . . RES 2K OHM 1/2W 1% . . . . . . . . . . . . . . . . . . . 2

548 2400 347 . . . . . RES 3.01K OHM 1/2W 1% . . . . . . . . . . . . . . . . . 1

574 0431 000 . . . . . RELAY 4PDT 24VAC . . . . . . . . . . . . . . . . . . . . . 1

T001 T002

C001 C002

R004

R001 R002

R003

K001

610 0679 000 . . . . . PLUG, SHORTING, .25" CTRS . . . . . . . . . . . . . . 1

610 0854 000 . . . . . HEADER, 40 PIN PC RIBBON . . . . . . . . . . . . . . 2

612 0904 000 . . . . . JACK, PC MT GOLD PLATED . . . . . . . . . . . . . . 4

614 0790 000 . . . . . TERM MODULE,1C PC MTG 236. . . . . . . . . . . 74

843 4979 001 . . . . . PWB, CUST INTERFACE . . . . . . . . . . . . . . . . . 1

843 4979 024 . . . . . SCHEM, CUST IN-FACE/PS . . . . . . . . . . . . . . . 0

999 2356 002 . . . . . HARDWARE LIST . . . . . . . . . . . . . . . . . . . . . . . 1

J001 J002

#TB001 #TB002 #TB003

Table 6-11. AUXILLARY BOARD,A2 - 992 7044 001

HARRIS P/N DESCRIPTION QTY/UM REF. SYMBOLS/EXPLANATIONS

000 0000 008 . . . . . SELECT IN TEST COMPONENT . . . . . . . . . . . 0 R018

358 0002 000 . . . . . BRACKET RESISTOR MTG . . . . . . . . . . . . . . . 4

358 2997 000 . . . . . END PLATE,236 TERM MODULE . . . . . . . . . . . 9

#R001 #R011

#TB001 #TB002

384 0268 000 . . . . . RECT 7.5KV PIV 500MA 2W . . . . . . . . . . . . . . . 6

384 0719 000 . . . . . TRANSZORB 1N6373 5V 5W . . . . . . . . . . . . . . 2

526 0097 000 . . . . . CAP 47UF 35V 20% . . . . . . . . . . . . . . . . . . . . . . 1

540 0343 000 . . . . . RES 3.0K OHM 1W 5% . . . . . . . . . . . . . . . . . . . 1

CR001 CR002 CR003 CR004 CR005 CR006

CR007 CR008

C002

R017

Rev. B: 07-10-96 888-2389-001

WARNING: Disconnect primary power prior to servicing.

6-15

540 0563 000. . . . . . RES 10.0 OHM 2W 5% . . . . . . . . . . . . . . . . . . . . 1

540 0583 000. . . . . . RES 68.0 OHM 2W 5% . . . . . . . . . . . . . . . . . . . . 1

540 0617 000. . . . . . RES 1.8K OHM 2W 5% . . . . . . . . . . . . . . . . . . . . 1

540 0642 000. . . . . . RES 20.0K OHM 2W 5% . . . . . . . . . . . . . . . . . . . 1

542 0069 000. . . . . . RES 500 OHM 5% 12W . . . . . . . . . . . . . . . . . . . 1

542 0163 000. . . . . . RES 100K OHM 5% 20W . . . . . . . . . . . . . . . . . . 2

542 0208 000. . . . . . RES 100 OHM 5% 50W . . . . . . . . . . . . . . . . . . . 1

542 1598 000. . . . . . RES 3 OHM 5% 50W . . . . . . . . . . . . . . . . . . . . . 1

548 0125 000. . . . . . RES 1M OHM 3W 1% . . . . . . . . . . . . . . . . . . . . . 2

548 2400 301. . . . . . RES 1K OHM 1/2W 1% . . . . . . . . . . . . . . . . . . . . 2

550 0932 000. . . . . . POT 5K OHM 2W 10% . . . . . . . . . . . . . . . . . . . . 1

552 0998 000. . . . . . RES, ADJ 5K OHM 130W . . . . . . . . . . . . . . . . . . 1

614 0790 000. . . . . . TERM MODULE,1C PC MTG 236 . . . . . . . . . . . 26

813 4999 036. . . . . . STDOFF 6-32X2-1/2 1/4 HEX . . . . . . . . . . . . . . . 2

839 7832 082. . . . . . SCH, HT-7/10 OVERALL 3PH . . . . . . . . . . . . . . 0

839 7832 083. . . . . . SCHEM, HT3.5/5FM OVERALL . . . . . . . . . . . . . 0

839 7832 084. . . . . . SCH, HT-7/10 OVERALL 1PH . . . . . . . . . . . . . . 0

839 7832 085. . . . . . SCHEM,4 WIRE HT10 OVERALL . . . . . . . . . . . . 0

843 4979 008. . . . . . PWB SPEC, AUXILLARY . . . . . . . . . . . . . . . . . . 1

999 2350 001. . . . . . WIRE/TUBING LIST . . . . . . . . . . . . . . . . . . . . . . 1

R015

R005

R008

R013

R006

R009 R010

R011

R001

R007 R012

R014 R016

R002

R003

#TB001 #TB002

#922-1231-001, SHIELD

Table 6-12. IPA REGULATOR A3 - 992 7070 001

HARRIS P/N DESCRIPTION QTY/UM REF. SYMBOLS/EXPLANATIONS

354 0147 000. . . . . . LUG, SHAKE #6 45 DEG . . . . . . . . . . . . . . . . . . 2

380 0670 000. . . . . . XSTR, MJ15015 . . . . . . . . . . . . . . . . . . . . . . . . . 4

382 1146 000. . . . . . IC LM317HVK ESD . . . . . . . . . . . . . . . . . . . . . . . 1

Q010 Q011 Q012 Q013

U010

404 0785 000. . . . . . SOCKET TRANSISTOR TO-3 . . . . . . . . . . . . . . 5

410 0232 000. . . . . . INSULATOR TO-3 MICA . . . . . . . . . . . . . . . . . . . 5

516 0435 000. . . . . . CAP .05UF 100V 20% . . . . . . . . . . . . . . . . . . . . . 4

813 5000 011. . . . . . STDOFF 6-32X1 5/16 HEX . . . . . . . . . . . . . . . . . 4

XQ010 XQ011 XQ012 XQ013 XU010

#Q010 #Q011 #Q012 #Q013 #U010

C010 C011 C012 C013

#A001

839 7841 001. . . . . . SCHEM, IPA REGULATOR . . . . . . . . . . . . . . . . 0

939 7832 025. . . . . . HEATSINK, IPA REGULATOR . . . . . . . . . . . . . . 1

939 7832 050. . . . . . PLATE, REGULATOR . . . . . . . . . . . . . . . . . . . . . 1

992 7071 001. . . . . . PWB, IPA REGULATOR A3A1 . . . . . . . . . . . . . . 1

999 2535 001. . . . . . HARDWARE LIST . . . . . . . . . . . . . . . . . . . . . . . . 1

999 2536 001. . . . . . WIRE/TUBING LIST . . . . . . . . . . . . . . . . . . . . . . 1

A001

Table 6-13. PWB, IPA REGULATOR A3A1 - 992 7071 001

HARRIS P/N DESCRIPTION QTY/UM REF. SYMBOLS/EXPLANATIONS

358 2997 000. . . . . . END PLATE,236 TERM MODULE . . . . . . . . . . . . 6 #TB001 #TB002 #TB003 #TB004

380 0047 000. . . . . . XSTR, 2N3500 . . . . . . . . . . . . . . . . . . . . . . . . . . 1

380 0575 000. . . . . . XSTR, 2N5679 . . . . . . . . . . . . . . . . . . . . . . . . . . 1

384 0020 000. . . . . . RECTIFIER IN4005 . . . . . . . . . . . . . . . . . . . . . . . 4

Q002

Q001

CR001 CR002 CR003 CR004

404 0528 000. . . . . . HEAT SINK 2228B . . . . . . . . . . . . . . . . . . . . . . . 1

516 0435 000. . . . . . CAP .05UF 100V 20% . . . . . . . . . . . . . . . . . . . . . 4

522 0259 000. . . . . . CAP 1UF 100V . . . . . . . . . . . . . . . . . . . . . . . . . . 3

522 0276 000. . . . . . CAP 10UF 160V 20% . . . . . . . . . . . . . . . . . . . . . 1

548 1487 000. . . . . . RES 0.1 OHM 10W 1% . . . . . . . . . . . . . . . . . . . . 4

548 2400 201. . . . . . RES 100 OHM 1/2W 1% . . . . . . . . . . . . . . . . . . . 1

548 2400 237. . . . . . RES 237 OHM 1/2W 1% . . . . . . . . . . . . . . . . . . . 1

548 2400 301. . . . . . RES 1K OHM 1/2W 1% . . . . . . . . . . . . . . . . . . . . 1

548 2400 366. . . . . . RES 4.75K OHM 1/2W 1% . . . . . . . . . . . . . . . . . 1

#Q001

C002 C003 C004 C005

C001 C006 C008

C007

R005 R006 R009 R013

R014

R007

R016

6-16 888-2389-001

WARNING: Disconnect primary power prior to servicing.

Rev. B: 07-10-96

548 2400 369 . . . . . RES 5.11K OHM 1/2W 1% . . . . . . . . . . . . . . . . . 1

548 2400 401 . . . . . RES 10K OHM 1/2W 1% . . . . . . . . . . . . . . . . . . 1

548 2400 418 . . . . . RES 15K OHM 1/2W 1% . . . . . . . . . . . . . . . . . . 1

548 2400 430 . . . . . RES 20K OHM 1/2W 1% . . . . . . . . . . . . . . . . . . 1

548 2400 436 . . . . . RES 23.2K OHM 1/2W 1% . . . . . . . . . . . . . . . . . 1

560 0080 000 . . . . . POSISTOR 50 OHM +/-20% . . . . . . . . . . . . . . . 4

614 0790 000 . . . . . TERM MODULE,1C PC MTG 236. . . . . . . . . . . 22

839 7840 001 . . . . . PWB ASSY REGULATOR . . . . . . . . . . . . . . . . . 1

839 7841 001 . . . . . SCHEM, IPA REGULATOR . . . . . . . . . . . . . . . . 0

R010

R012

R015

R008

R011

R001 R002 R003 R004

#TB001 #TB002 #TB003 #TB004

Table 6-14. 300W IPA MODULE A8 - 992 7073 001

HARRIS P/N DESCRIPTION QTY/UM REF. SYMBOLS/EXPLANATIONS

358 0059 000 . . . . . STUD 85 OVAL HEAD . . . . . . . . . . . . . . . . . . . . 4

358 0410 000 . . . . . RETAINER 85 ALL HDS . . . . . . . . . . . . . . . . . . . 4

358 0801 000 . . . . . WASHER WEAR 85 NYLON . . . . . . . . . . . . . . . 4

740 1221 000 . . . . . MODULE, 300W SS AMPLIFIER . . . . . . . . . . . . 1

922 0856 017 . . . . . ANGLE, MODULE MTG. . . . . . . . . . . . . . . . . . . 1

922 0856 018 . . . . . ANGLE, MODULE MTG. . . . . . . . . . . . . . . . . . . 1

Table 6-15. FM XMTR CABLE PKG - 992 8309 001

HARRIS P/N DESCRIPTION QTY/UM REF. SYMBOLS/EXPLANATIONS

917 2074 012 . . . . . CABLE, POWER SUPPLY . . . . . . . . . . . . . . . . . 1

917 2074 024 . . . . . CABLE, RESISTOR ASSY . . . . . . . . . . . . . . . . . 1

917 2074 032 . . . . . CABLE, CONTROL . . . . . . . . . . . . . . . . . . . . . . 1

917 2074 033 . . . . . CABLE, BASIC, 8 AWG . . . . . . . . . . . . . . . . . . . 1

R002

A001J001

929 9728 069 . . . . . CABLE CTRLR TO FILTER . . . . . . . . . . . . . . . . 2

929 9728 084 . . . . . CABLE, CONTROLLER . . . . . . . . . . . . . . . . . . . 2

999 2468 002 . . . . . WIRE/TUBING LIST . . . . . . . . . . . . . . . . . . . . . . 1

#A006

#A004 TO J001 & J002

*** E N D O F R E P O R T ***

Rev. B: 07-10-96 888-2389-001

WARNING: Disconnect primary power prior to servicing.

6-17

SECTION VII

DIAGRAMS

7.1

INTRODUCTION

This section provides PA efficiency curves and running sheets required for maintenance of the HT3.5/5CD and HT7/10CD FM BROADCAST TRANSMITTER as well as a listing of the drawings provided in the separate drawing package provided with this manual for your transmitter.

Drawings Provided In Technical Manual

PA Efficiency Curves

Drawing Title Drawing Number

Drawings Provided in Separate Drawing Package

(ONLY applicable drawings shipped in each package)

Transmitter Block Diagram

Transmitter Outline Drawing

HT 3.5/5CD

HT 7/10CD

Transmitter Overall Schematic

HT 3.5/5CD

HT 7/10CD 1-phase

Drawing Title Drawing Number

839 7832 066

839 7832 040

839 7832 041

HT 7/10CD 3-phase

HT 7/10CD 415VAC 50Hz 3-phase, 4 wire

Running Sheets, Main HT 3/5CD

Running Sheets, Main HT 7/10CD 1-phase

Running Sheets, Main HT 7/10CD 3-phase

Controller Board Schematic Diagram

Customer Interface/Control Power Supply Schematic Diagram

IPA Regulator Schematic Diagram

Low-Pass Filter & Directional Coupler Schematic Diagram

839 7832 083

839 7832 084

839 7832 082

839 7832 085

817 2074 034

817 2074 035

817 2074 036

839 7832 019

843 4979 024

839 7841 001

839 5303 001

The following schematics pertain to the 300 Watt Amplifier Module A8

Schematic, Directional Coupler, 300 Watt Module

Schematic, Control Board, 300 Watt Module

Schematic, 300 Watt Module

829 9135 466

839 7832 071

843 4979 030

888-2386-001

WARNING: Disconnect primary power prior to servicing.

7-1

HT 3.5CD

7-2

HT 5CD

PA Efficiency Curves

888-2386-001

WARNING: Disconnect primary power prior to servicing.

HT 7CD

HT 10CD

PA Efficiency Curves

888-2386-001

WARNING: Disconnect primary power prior to servicing.

7-3

7-4

Figure 7-9. Schematic, Directional Coupler 829 9135 466

888-2386-001

WARNING: Disconnect primary power prior to servicing.

Was this manual useful for you? yes no
Thank you for your participation!

* Your assessment is very important for improving the work of artificial intelligence, which forms the content of this project

Download PDF

advertisement