Agilent Technologies Drums 2948 User's Manual

Agilent Technologies Drums 2948 User's Manual
Agilent Technologies, Inc
24001 E Mission
www agilent corn
Liberty Lake, W A 99019
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Agilent Technologies
Innovating the HPWay
June 8,2000
Dear Customer,
As of November 1, 1999, four of Hewlett-Packard's businesses, test and measurement,
semiconductor products, health care solutions, and chemical analysis became a new company,
Agilent Technologies. Now, many of your Hewlett-Packard products and services are in the care of
Agilent Technologies.
At Agilent Technologies, we are working diligently to make this transition as smooth as possible for
you. However, as a result of this transition, the products and related documentation contained in this
shipment may be labeled with either the Hewlett-Packard name and logo, the Agilent Technologies
name and logo, or a combination of both. Information in this package may refer to Hewlett-Packard
(HP), but applies to your Agilent Technologies product. Hewlett-Packard and Agilent branded
products with the same model number are interchangeable.
Whatever logo you see, the information, products, and services come from the same reliable source.
If you have questions about Agilent Technologies products and services, please visit our website at
http://www.aqilent.com.
Sincerely,
Rebranding Team
HP 8904A
MULTIFUNCTION SYNTHESIZER
(Including Options 001, 002, 003, and 004)
Service Manual
SERIAL NUMBERS
This manual applies directly t o instruments with
serial numbers prefixed
S E W PREFIXES
2712A to 2948A and all M A J O R changes that apply to your instrument.
rev.OlJUL91
For additional important information about serial
numbers, refer to "INSTRUMENTSCOVERED BY
THIS MANUAL" in Section 1.
Fourth Edition
This material may be reproduced by or for the U.S.
Government pursuant to the Copyright License under the clause at DFARS 52.227-7013 (APR 1988).
[email protected] HEWLETT-PACKARD COMPANY 1987
EAST 24001 MISSION AVENUE, TAF C-34, SPOKANE, WASHINGTON, U.S.A. 99220
Service Manual HP Part 08904-90008
Other Documents Availiable:
Operation and Calibration Manual HP Part 08904-90007
Operation and Application Guide HP Part 5953-8491
Microfiche Service Manual HP Part 08904-90020
Microfiche OperationlCalibration Manual HP Part 08904-90019
Printed In U.S.A.: June 1992
HEWLETT
PACKARD
1 Regulatory Information
(Updated March 1999)
1
Regulatory Information (Updated March 1999)
Safety Considerations
GENERAL
This product a n d related documentation must be reviewed for familiarization with safety
m a r k i n g s a n d instructions before operation.
This product has been designed a n d tested in accordance with IEC Publication 1010,
"Safety R e q u i r e m e n t s for Electronic Measuring Apparatus," and has been supplied in a
safe condition. This instruction documentation contains information a n d warnings which
must be followed by t h e u s e r t o ensure safe operation a n d to maintain t h e product i n a safe
condition.
SAFETY EARTH GROUND
A uninterruptible safety e a r t h ground must be provided from the m a i n power source t o t h e
product i n p u t wiring terminals, power cord, or supplied power cord set.
A
SAFETY SYMBOLS
Indicates i n s t r u m e n t d a m a g e c a n occur if indicated operating limits a r e exceeded.
r;n Indicates h a z a r d o u s voltages.
1- Indicates e a r t h (ground) t e r m i n a l
~~
WARNING
~
~
CAUTION
2
~
~
A WARNING note denotes a hazard. It calls attention to a procedure,
practice, or the like, which, if not correctly performed or adhered to,
could result in personal injury. Do not proceed beyond a WARNING
sign until the indicated conditions are fully understood and met.
~
A CAUTION note denotes a hazard. I t calls attention to a n operation
procedure, practice, or the like, which, if not correctly performed or a d h e r e d
to, could r e s u l t i n damage to or destruction of part or all of t h e product. Do
n o t proceed beyond a n CAUTION note until t h e indicated conditions a r e fully
understood a n d met.
Chapter 1
Regulatory Information (Updated March 1999)
Safety Considerations for this Instrument
~
WARNING
This product is a Safety Class I instrument (provided with a
protective earthing ground incorporated in the power cord). The
mains plug shall only be inserted in a socket outlet provided with a
protective earth contact. Any interruption of the protective
conductor inside or outside of the product is likely to make the
product dangerous. Intentional interruption is prohibited.
Whenever it is likely that the protection has been impaired, the
instrument must be made inoperative and be secured against any
unintended operation.
If this instrument is to be energized via an auto transformer (for
voltage reduction), make sure the common terminal is connected to
the earth terminal of the power source.
If this product is not used as specified, the protection provided by
the equipment could be impaired. This product must be used in a
normal condition (in which all means for protection are intact) only.
N o operator serviceable parts in this product. Refer servicing to
qualified personnel. To prevent electrical shock, do not remove
covers.
Servicing instructions are for use by qualified personnel only. To
avoid electrical shock, do not perform any servicing unless you are
qualified to do so.
The opening of covers or removal of parts is likely to expose
dangerous voltages. Disconnect the product from all voltage sources
while it is being opened.
The power cord is connected to internal capacitors that my remain
live for 5 seconds after disconnecting the plug from its power supply.
For Continued protection against fire hazard, replace the line fuse(s)
only with 250 V fuse(s) or the same current rating and type (for
example, normal blow or time delay). Do not use repaired fuses or
short circuited fuseholders.
Always use the three-prong ac power cord supplied with this
product. Failure to ensure adequate earth grounding by not using
this cord may cause product damage.
This product is designed for use in Installation Category I1 and
Pollution Degree 2 per IEC 1010 and IEC 664 respectively. FOR
INDOOR USE ONLY.
This product has autoranging line voltage input, be sure the supply
voltage is within the specified range.
Chapter 1
3
Regulatory Information (Updated March 1999)
To prevent electrical shock, disconnect instrument from mains (line)
before cleaning. Use a dry cloth or one slightly dampened with water
to clean the external case parts. Do not attempt to clean internally.
Ventilation Requirements: When installing the product in a cabinet,
the convection into and out of the product must not be restricted.
The ambient temperature (outside the cabinet) must be less than the
maximum operating temperature of the product by 4" C for every 100
watts dissipated in the cabinet. If the total power dissipated in the
cabinet is greater than 800 watts, then forced convection must be
used.
Product Markings
CE - the CE m a r k is a registered t r a d e m a r k of the E u r o p e a n Community. A C E m a r k
accompanied by a year indicated t h e y e a r t h e design was proven.
CSA - t h e CSA m a r k is a registered t r a d e m a r k of t h e C a n a d i a n S t a n d a r d s Association.
Chapter 1
Model 8904A
Contents
CONTENTS
Section 6 .
Replaceable Parts
Introduction to This Section . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Reference Designations and Abbreviations Used in This Manual . . . . . . . . . . . . . . . . . . . . . . . .
Replaceable Parts List . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Ordering Parts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Replaceable Parts List Updating (Manual Updates) . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Mechanical and Chassis Part Locations and Reference Designations . . . . . . . . . . . . . . . . . . . . . .
6.1
6.1
6.1
6.1
6.2
6.2
Section 7 .Instrument Changes
Introduction to This Section . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Option Conversions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Instrument Modifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Firmware Updates (A2U12 and A2U13) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Hardware Modifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Modification for Possible Ground Wire Shock Hazard . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Modification for Output Overvoltage Protection Improvement . . . . . . . . . . . . . . . . . . . . . . .
Modification for Potential Power Supply Short . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Section 8
7.1
7.1
7.1
7.8
7.8
7.9
7-13
7-14
.Service
Introduction to This Section . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
How the Section is Organized . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Safety Considerations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Before Applying Power . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Safety . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Service Tools, Helps, and Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Printed Circuit Board Extractor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Assembly, Parts. and Cable Locations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Other Service Documents . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Recommended Test Equipment and Accessories . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Schematic Symbology and Schematic Diagram Notes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Principles of Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Overall . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
A2 Digital Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
A3 Output Assembly (Service Sheets 1 through 4) . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
A2 Digital Assembly to A3 (or A10) Output Assembly Interface . . . . . . . . . . . . . . . . . . . . . .
A2 Digital Assembly to A1 Keyboard Assembly Interface . . . . . . . . . . . . . . . . . . . . . . . . .
A2 Digital Assembly to A5 Display Assembly Interface . . . . . . . . . . . . . . . . . . . . . . . . . . .
A3 or A10 Output Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
reu.200CT88
8.1
8.1
8.1
8.1
8-1
8-3
8.3
8.3
8.3
8.3
8.3
8-15
8-15
8-23
8-24
8-29
8-29
8-30
8-38
8-41
8-42
Contents
Model 8904A
Section 8 .
Service (cont’d)
How to Restore the Serial Number in a Replacement A2 Digital Assembly . . . . . . . . . . . . . . . . 8-43
How to Restore Options 001 and 003 in a Replacement A2 Digital Assembly . . . . . . . . . . . . . . 8-46
How to Replace the Memory Backup Battery . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
8-48.1
Service Sheets 1 through 4 (schematics) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
8-50
reu.200CT88
Replaceable Parts
Model 8904A
Section 6
REPLACEABLE PARTS
6-1. INTRODUCTION TO THIS SECTION
This section contains information for ordering parts. Table 6- 1 lists reference designations, and
Table 6-2 lists abbreviations that are used in the Replaceable Parts List. Table 6-3 lists all replaceable
parts in the instrument. Table 6-4 contains the names and addresses that correspond to the
manufacturer’s code numbers listed in Table 6-3. Also included in this section are drawings to aid
in identifying and ordering chassis mounted parts and mechanical parts.
6-2. REFERENCE DESIGNATIONS AND ABBREVIATIONS USED IN THIS MANUAL
Table 6-1 lists the reference designation letters for electrical parts in the instrument. The letter
designations found in Table 6-1 are coupled with numeric designations to provide a unique reference
designation for each part in the instrument. For example A3R1 is the reference designation of a
particular resistor R1 on assembly A3. Designators with no letter are mechanical parts.
Table 6-2 lists abbreviations used in the parts list and on schematics.
6-3. REPLACEABLE PARTS LIST
Table 6-3 is a list of replaceable parts and is organized as follows:
a. Electrical assemblies and their components with reference designations in alphanumeric order.
b. Chassis-mounted parts with reference designations in alphanumeric order.
c. Mechanical parts with reference designations in numeric order.
Ordering Parts.
Instrument Serial Numbers.
Attached to the rear of the instrument is a serial-number plate. The first four digits and the letter
are the instrument serial-number prefix. The last five digits (serial-number suffix) are unique to each
instrument. When parts in the instrument are changed, the serial-number prefix of the instrument may
also change. This means that sometimes a part will be listed more than once in the the replaceable
parts list along with a serial-number prefix or range of serial-number prefixes. Find the serial-number
prefix on the serial plate of your instrument and order the part listed under the corresponding prefix
in the table. If no serial prefix information is listed, the part is compatible in instruments of all serial
numbers.
NOTE
I t is possible that some assemblies in your instrument have been updated
(through service or retrofitting) to reflect changes made to instruments with
serial-number prefixes later than that shown o n your instrument serialnumber tag. Be sure to note the printed circuit board number of the assembly
being repaired or replaced when ordering parts for your instrument.
6- 1
Model 8904A
Replaceable Parts
How to Order
To order a part in the Replaceable Parts List, call or write the nearest Hewlett-Packard Sales Office.
Have the following information ready to speed the ordering process:
1. T h e Hewlett-Packard part number with the check digit. (The check digit will ensure accurate and
timely processing of your order.)
2. T h e quantity required.
3. An approved purchase order number. (Sometimes required.)
NOTE
Within the USA, it is better to order directly from the HP Support
Mater& Organization, RoseviUe, California. Ask your nearest HP office
for information and f o r m for the uDirect Order Systems.
Replaceable Parts List Updating (Manual Updates)
A “MANUAL UPDATES‘ packet is shipped with the manual, when necessary, to provide the most
current information available at the time of shipment. These packets consist of replacement and
addition pages which should be incorporated into the manual to bring it up to date.
Hewlett-Packard offers a Documentation Update Service that will provide you with further updates
as they become available. If you operate or service instruments of different serial prefixes, we strongly
recommend that you join this service immediately to ensure that you manual is kept current. For more
information, refer to the Documentation Update Service reply card included in this manual, or calk
Technical Writing Department (509)922-4001,
or write:
Hewlett-Packard Company
Technical Writing Department
24001 E. Mission - TAF C-34
Spokane, WA 99220
6-4. MECHANICAL AND CHASSIS PART LOCATIONS AND REFERENCE DESIGNATIONS
Most mechanical parts are identified in Figures 6-1 to 6-6. These figures are located at the end of
this section. To find the part number and description of a mechanical part, find the part in one of the
drawings, and then look up the item number in Table 6-3 (mechanical part numbers are listed under
Miscellaneous Parts toward the end of Table 6-3).
6-2
rev.15FEB88
Model 8904A
Replaceable Parts
nable 6-1. Reference Designations
REFERENCE DESIGNATIONS
AT
A . . . . . . . . assembly
. . . . . . attenuator; isolator;
termination
B . . . . . . . . . . . . . . . fan: motor
BT . . . . . . . . . . . . . . . . . battery
c . . . . . . . . . . . . . . . . capacitor
CP . . . . . . . . . . . . . . . . coupler
CR . . . . . . . . . . . . diode; diode
thyristor: varactor
DC . . . . . . . directional coupler
DL . ,. . . . . . . . . . . . . . delay line
DS ........... annunciator:
signaling device
(audible or visual);
lamp; LED
.
E
. . . . . . . . . . . .miscellaneous
electrical part
F ....................
fuse
FL . . . . . . . . . . . . . . . . . . . filter
H . . . . . . . . . . . . . . . . hardware
HY . . . . . . . . . . . . . . . circulator
J . . . . . . . . electrical connector
(stationary portion);
jack
K . . . . . . . . . . . . . . . . . . . relay
L . . . . . . . . . . . . . coil; inductor
M . . . . . . . . . . . . . . . . . . meter
MP . . . . . . . . . . miscellaneous
mechanical part
P
. . . . . . . electrical connector
(movable portion);
Plug
Q . . . . . . . . . . transistor; SCR;
triode thyristor; FET
R . . . . . . . . . . . . . . . . . resistor
RT . . . . . . . . . . . . . . thermistor
S . . . . . . . . . . . . . . . . . . switch
T . . . . . . . . . . . . . . transformer
TB . . . . . . . . . . terminal board
TC . . . . . . . . . . . thermocouple
TP . . . . . . . . . . . . . . . test point
U
. . . . . . . . . integrated circuit;
microcircuit
. . . . . . . . . . . . . electron tube
VR . . . . . . . . voltage regulator;
V
breakdown diode
W
. . . . . . . cable: transmission
X
. . . . . . . . . . . . . . . . . . socket
. . . . . . . . crystal unit (piezo-
Y
path; wire
electric or quartz)
2 . . . . . . . . tuned cavity; tuned
circuit
Table 6-2. Abbreviations (1 of 2)
ABBREVIATIONS
ac . . . . . . . . alternating current
ACCESS . . . . . . . . . accessory
ADJ . . . . . . . . . . . . adjustment
AID ........ analog-to-digital
AL . . . . . . . . . . . . . . aluminum
ALC . . . . . . . . . automatic level
control
amplitude modulation
. . . . . . . . . . . amplifier
APC . . . . . . . automatic phase
control
ASSY . . . . . . . . . . . . assembly
AUX . . . . . . . . . . . . . . auxiliary
. . . . . average
avg .
AWG
American wire
BAL . . . . . . . . . . . . . . . balance
BCD . . . . . . . . . . binary coded
decimal
BD . . . . . . . . . . . . . . . . .board
BECU . . . . . . beryllium copper
BFO . . . . . . . . . beat frequency
BKDN . . . . . . . . . .breakdown
BP . . . . . . . . . . . . . .bandpass
BPF . . . . . . . . . bandpass filter
BRS . . . . . . . . . . . . . . . .brass
BWO . . . . . . . backware-wave
oscillator
CAL . . . . . . . . . . . . . .calibrate
ccw . . . . . . . counter-clockwise
CER . . . . . . . . . . . . . .ceramic
CHAN . . . . . . . . . . . . . channel
cm . . . . . . . . . . . . . . centimeter
CMO . . . . . cabinet mount only
COAX . . . . . . . . . . . . . . coaxial
COEF . . . . . . . . . . . coefficient
COM . . . . . . . . . . . . . common
COMP . . . . . . . . . composition
COMPL . . . . . . . . . . . complete
CONN . . . . . . . . . . . connector
CP . . . . . . . . . . cadmium plate
CRT . . . . . . . cathode-ray tube
CTL . . . . . . . . . complementary
transistor logic
CW . . . . . . . . continuous wave
cw . . . . . . . . . . . . . . clockwise
cm . . . . . . . . . . . . . . centimeter
D/A . . . . . . . . digital-to-analog
dB . . . . . . . . . . . . . . . . . decibel
dBm . . . . . . . . decibel referred
to 1 mW
dc . . . . . . . . . . . .direct current
deg . . . . . degree (temperature
interval or difference)
...' . . . . . . . . . . . degree (plane
angle)
OC . . . . . . . . . . degree Celsius
(centigrade)
OF . . . . . . . . degree Fahrenheit
OK . . . . . . . . . . . degree Kelvin
DEPC . . . . . deposited carbon
DET . . . . . . . . . . . . . . detector
diam . . . . . . . . . . . . . .diameter
DIA . . . . . . . diameter (used in
parts list)
DlFF AMPL . . . . . . differential
amplifier
div . . . . . . . . . . . . . . . . division
DPDT . . . . . . . . . . double-pole,
double-throw
DR . . . . . . . . . . . . . . . . . .drive
DSB . . . . . . . double sideband
DTL . . . . . . . . diode transistor
logic
DVM . . . . . . . digital voltmeter
ECL . . . . . . . . emitter coupled
logic
EMF . . . . . electromotive force
EDP
. . . . . . . . . electronic data
processing
ELECT . . . . . . . . . . electrolytic
ENCAP . . . . . . . . encapsulated
EXT . . . . . . . . . . . . . . . external
F . . . . . . . . . . . . . . . . . . . farad
FET . . . . field-effect transistor
. . . . . . . flip-flop
FM . . . . frequency modulation
FP . . . . . . . . . . . . . front panel
FREQ . . . . . . . . . . . . frequency
FXD . . . . . . . . . . . . . . . . . fixed
g . . . . . . . . . . . . . . . . . . . gram
GE . . . . . . . . . . . . . germanium
GHz . . . . . . . . . . . . .gigahertz
GL . . . . . . . . . . . . . . . . . . glass
GRD . . . . . . . . . . . . ground(ed)
...... henry
H ....
. . . . . . . hour
h ....
HET . _
. . heterodyne
HEX . . . . . . . . . . . . .hexagonal
HD . . . . . . . . . . . . . . . . . .head
IiF . . . . . . . . . . high frequency
HG . . . . . . . . . . . . . . . mercury
HI . . . . . . . . . . . . . . . . . . .high
HP . . . . . . . . . Hewlett-Packard
HPF . . . . . . . . . high pass filter
HR . . . . . . . . . . . hour (used in
parts list)
HV . . . . . . . . . . . .high voltage
Hz . . . . . . . . . . . . . . . . . . Hertz
IC . . . . . . . . . integrated circuit
ID . . . . . . . . . . inside diameter
IF . . . . . . . . . . . . .intermediate
frequency
IMPG . . . . . . . . . . impregnated
in . . . . . . . . . . . . incandescent
INCL . . . . . . . . . . . . .include(s)
I N P . . . . . . . . . . . . . . . . . . input
INS . . . . . . . . . . . . . . insulation
INT . . . . . . . . . . . . . . . .internal
kg . . . . . . . . . . . . . . . . kilogram
k . . . . . . . . . . . . . . . . . . kilohm
kV . . . . . . . . . . . . . . . . . kilovolt
Ib . . . . . . . . . . . . . . . . . . pound
LC . . . . . . . . . . . . . inductancecapacitance
LED . . . . . light-emitting diode
LH . . . . . . . . . . . . . . . left hand
LIM . . . . . . . . . . . . . . . . . . limit
LIN . . . . . . . linear taper (used
in parts list)
LK WASH . . . . . . lock washer
LO . . . . . . low; local oscillator
LOG . . . . . . . logarithmic taper
(used in parts list)
log '
. . . lcgarithm(ic)
LPF
. low pass filter
LV .
. . . low voltage
m . . . . . . . . . . meter (distance)
mA . . . . . . . . . . . . . milliampere
MAX . . . . . . . . . . . . . maximum
M . . . . . . . . . . . . . . . . megohm
MEG . . . . . . . meg (lo6) (used
in parts list)
MET FLM . . . . . . . . metal film
MET OX . . . . . . metallic oxide
MF . . . . . . medium frequency;
microfarad (used in
mg
manufacturer
. . . . . . . . . . . . . . . milligram
mH . . . . . . . . . . . . . . millihenry
mho . . . . . . . . . . . . . . . . .mho
min . . . . . . . . . . . minute (time)
. . . . . . . . . . minute (plane angle)
MlNAT . . . . . . . . . . . miniature
mm . . . . . . . . . . . . . . millimeter
NOTE
All abbreviations in the parts list will b% in upper-case.
6-3
Model 8904A
Replaceable Parts
Table 6-2. Abbreviations (2 of 2)
MOD .... modulator
. . . . . . . . . . . momentary
MOM
device)
mV ................ millivolt
mVac . . . . . . . . . . . millivolt, ac
mVpp
. . . . . . . millivolt, peakto-peak
mVrms ......... millivolt, rms
mW . . . . . . . . . . . . . . .milliwan
MUX . . . . . . . . . . . . . multiplex
MY . . . . . . . . . . . . . . . . . mylar
& . . . . . . . . . . . . microampere
pF . . . . . . . . . . . . . . microfarad
pH . . . . . . . . . . . . . microhenry
pV . . . . . . . . . . . . . . . microvolt
pVac .......... microvolt, ac
pVdc . . . . . . . . . . microvolt, dc
@Vpk . . . . . . . . microvolt. peak
pVp-p . . . . . . . microvolt, peakto-peak
pvrms ........ microvolt, rms
pW .............. microwatt
N/O . . . . . . . . . . normally open
NOM .............. nominal
NORM . . . . . . . . . . . . . normal
NPN
negative-positiveNPO
. . . . . . . negative-positive
zero (zero temperature coefficient)
NRFR . . . . . not recommended
for field replacement
NSR . . . . . . . . . not separately
replaceable
ns . . . . . . . . . . . . . nanosecond
nW .....
. . . nanowatt
OBD .... order by description
OD ........ outside diameter
OH . . . . . . . . . . . . . . oval head
OP AMPL . . . . . . . operational
amplifier
. . . . . . . . . option
....... oscillator
O X . . . . . . . . . . . . . . . . . . oxide
. . . . . . ounce
peak (used in parts
PAM
........ pulse-amplitude
modulation
PC ........... printed circuit
PCM .... pulse-code modulation; pulse-count
modulation
PDM . . . . . . . . . pulse-duration
modulation
pF . . . . . . . . . . . . . . . picofarad
PH BRZ . . . . phosphor bronze
PHL . . . . . . . . . . . . . . . Phillips
PIN . . . . . . . . positive-intrinsicnegative
ltage
peak
lock
PLO . . . . phase lock oscillator
PM . . . . . . . phase modulation
PNP . . . . . . positive-negativepositive
P/O . . . . . . . . . . . . . . . . part of
POLY . . . . . . . . . . polystyrene
PORC . . . . . . . . . . . . porcelain
POS . , . , . positive: position(s)
(used in parts list)
POSN ............. position
p-p
. . . . . . . . . . . peak-to-peak
PPM
in parts list)
. . . . . . . . . pulse-position
modulation
PREAMPL . . . . . . preamplifier
PRF . . . . . . . . pulse-repetition
frequency
PRR . . . . pulse repetition rate
ps . . . . . . . . . . . . . picosecond
PT . . . . . . . . . . . . . . . . . . point
PTM . . . . . . . . . . . . pulse-time
modulation
PWM . . . . . . . . . . . pulse-width
modulation
RECT
REG
REPL
..............
rectifier
. . . . reference
............. regulated
..........
replaceable
interference
RH ... round head; right hand
RLC ............. resistanceinductancecapacitance
RMO ....... rack mount only
rms . . . . . . . root-mean-square
RND ................ round
ROM ..... read-only memory
R&P . . . . . . . . . rack and panel
RWV . . . . . . . reverse working
voltage
S
ng parameter
S
second (time)
(plane angle)
S-B ........ slow-blow (fuse)
(used in parts list)
SCR ....... silicon controlled
rectifier; screw
SE ............... selenium
SECT ............. sections
...
SI .................. silicon
S I L . . . . . . . . . . . . . . . . . . silver
SL . . . . . . . . . . . . . . . . . . . slide
SNR . . . . signal-to-noise ratio
SPDT .......... single-pole,
double-throw
SPG ................ spring
SR ............... splitring
SPST
single-pole,
W
SS ........... Service Sheet
SSB
. . . . . . . . single sideband
STL
.........
SWR . . . . standing-wave ratio
SYNC . . . . . . . . . . synchronize
T . . . . . timed (slow-blow fuse)
TA
tantalum
TC ............ temperature
compensating
NOTE
All abbreviations in the parts list will be in upper-case.
MULTIPLIERS
Abbreviation
T
G
M
k
da
d
C
m
P
n
P
f
a
6-4
Prefix
tera
gigs
mega
kilo
deka
deci
centi
milli
micro
nano
pic0
femto
ano
Multiple
10’2
109
106
103
10
10-1
10-2
10-3
10-6
10-9
10-12
10-’5
10-18
TD .............. time delay
TERM ............. terminal
TFT ...... thin-film transistor
TGL ................ toggle
THD . . . . . . . . . . . . . . . . thread
THRU . . . . . . . . . . . . . through
TI . . . . . . . . . . . . . . . . . titanium
TOL ............. tolerance
TTL
..... transistor-transistor
logic
N ...............
television
TVI .... television interference
TWT ..... traveling wave tube
U . . . . . . . . micro
(used
in parts list)
UF . . . . . . microfarad (used in
parts list)
UHF ..... ultrahigh frequency
UNDEF .......... undefined
UNFEG . . . . . . . . unregulated
v ..................... volt
VA . . . . . . . . . . . . . voltampere
Vac ............... volts, ac
VAR . . . . . . . . . . . . . . . variable
VCO ...... voltage-controlled
oscillator
Vdc ............... volts, dc
VDCW . . . . . volts, dc, working
(used in parts list)
VHF
oscillator
..... very-high frequency
Vrms . . . . . . . . . . . . volts, rms
VSWR ...... voltage standing
wave ratio
VTO . . . . . . . . . . . voltage-tune
oscillator
VTVM . . . . . . . . . vacuum-tube
voltmeter
V(X) ......... volts, switched
w . . . . . . . . . . . . . . . . . . . . wan
w l . . . . . . . . . . . . . . . . . . . with
WIV . . . . . . . . working inverse
voltage
WW ............ wirewound
W/O ............... without
YIG ...... yttrium-iron-garnet
Z, . . . . . . . . . . . characteristic
impedance
ReplaceabIe Parts
Model 8904A
Table 63'.Replaceable Parts
Reference
HPPart
Number
Designation
C
D
llfrCode
Mtr. Part Number
28480
08804-60201
DIGITAL ASSEMBLY (NW
DIGITAL ASSEMBLY (RESTORED)
28480
28480
08904-60102
089066Q102
1
DIGITAL ASSEMBLY (NEW)
DIGITAL ASSEMBLY (RESTORED)
28480
28480
08904-60202
08904-69202
Qty.
Description
A1
2 71ZA to 291 7A
SEE SECTION 7 KXI FRONT PANEL RETRoFlTWT
Alt
2025% and abwo
AI
08904-60201
4
1
KEYBOARD ASSEMBLY
NOT SEPARATELY REPLACEABLE
w1
A2
2712A to 2942A
A2
A2
2048A and a
A2
h
A2
2712A to 2M2A
A2BTl
2712A to 2942A
A2BTl
0890480102
08904-69102
4
2
1
08904-60202
08904-89202
5
3
14200281
3050.0990
2
7
1
3
BA'ITERY 2.8V .46A%IR US-DIOX PIN
WASHERFL NM NO.000 .WlN-ID .25-IN-ID
28480
28480
14200281
30504990
14200238
0
1
BAlTERY 3V 1.2AHR L M I U M POLYCARBON
28480
14204338
1
1
2 712A to 2 732A
A2u12
A2U13
i.
2737A to 2942A
AZUlZt
A2U13
2737A to 294OA
A2u12
2742A and a
A2u12
REFER TO SECTION 7
t
h
REFER TO SECTION 7
0890487010
9
1
EPROM
28480
0890487010
0~90487008
5
1
EPROM
28480
08904-87008
0890487009
6
1
EPROM
28480
0890487009
0890487011
0
1
EPROM
28480
089048701 1
2737A andabwo
A2U13
t R e f e r to Section i f o r u p d a t e information
rev.01JUL91
NO LONGER SEPARATELY REPLACEABLE
* F a c t o r y Selected C o m p o n e n t (Refer t o Section 5).
A E r r a t a p a r t change.
6-5
Model 8904A
Replaceable Parts
fible 6-3. Replaceable Parts
Reference
Designation
HPPart
Number
C
08904-60103
08904-69103
5
3
1
1
OUTPUT ASSEMBLY (NEW)
OUTPUT ASSEMBLY (RESTORED)
28480
28480
08904-60103
08904-69103
0890440203
08904-69203
6
4
1
1
OUTPUT ASSEMBLY (NEW)
OUTPUT ASSEMBLY (RESTORED)
28480
28480
08904-60203
08904-69203
01804116
0160-4832
0160-4832
0160-4832
1
4
4
4
11
35
NOT ASSIGNED
CAPACITOR-FXD 6.8UF+-10% 35VDC TA
CAPACITOR-FXD .OlUF +-1O% lWVDC CER
CAPACITOR-FXD .OlUF +-loo/. lWVDC CER
CAPACITOR-FXD .OlUF +-lo% 1WVDC CER
56289
28480
28480
28480
150D685X903562
0160-4832
01604832
0160-4832
A3C6
A3C7
A3C8
A3C9
A3C10
0160-4832
4
28480
01604832
0160-4535
4
28480
0160-4535
01604535
4
CAPACITOR-FXD .OlUF +-1oO/c lOOVDC CER
NOT ASSIGNED
CAPACITOR-FXD 1UF +-10% 50VDC CER
NOT ASSIGNED
CAPACITOR-FXD 1UF +-1O% 5OVDC CER
28480
0160-4535
A3C11
A3C12
A3C13
A3C14
A3C15-27
0160-4535
0160-4535
01804116
01804116
4
4
CAPACITOR-FXD 1UF +-lo% 50VDC CER
CAPACITOR-FXD 1UF +-lo% 50VDC CER
CAPACITOR-FXD 6.8UF+-10°/o 35VDC TA
CAPACITOR-FXD 6.8UF+-10% 35VDC TA
NOT ASSIGNED
28480
28480
56289
56289
0160-4535
0160-44535
150D685X9035B2
150D685X903562
A3C28
A3C29
A3C30
A3C31
A3C32
01600575
0160-6875
0160-6876
0160-6877
0160-6878
4
9
0
1
CAPACITOR-FXD .047UF +-20% 5OVDC CER
CAPACITOR-FXD 850PF +-1% 100VDC CER
CAPACITOR-FXD 7200PF +-1% 1WVDC CER
CAPACITOR-FXD 64PF +-1% 1OOVDC CER 0+30
CAPACITOR-FXD 293PF +-1% 1WVDC CER
28480
28480
28480
28480
28480
0160-0575
01606875
01606876
0160-6877
0160-6878
A3C33
A3C34
A3C35
A3C36
A3C37
0160-3879
0160-6880
0160-6881
0160-6882
0160-6883
7
5
7
8
9
1
1
CAPACITOR-FXD .OlUF +-20% 1WVDC CER
CAPACITOR-FXD 584PF +-1% 100VDC CER
CAPACITOR-FXD 1360PF +-1% 1WVDC CER
CAPACITOR-FXD 129OPF +-1% 1WVDC CER
CAPACITOR-FXD 438PF +-1% 100VDC CER
28480
28480
28480
28480
28480
0160-3879
0160-6880
0160-6881
0160-6882
0160-6883
A3C38
A3C39
A3C40
A3C41
A3C42
A3C43
0160-3875
3
1
28480
01604875
0160435
0160-4832
0160-4835
0160-4822
7
4
7
16
CAPACITOR-FXD 22PF +-5% POOVDC CER 0+-30
NOT ASSIGNED
CAPACITOR-FXD .1UF +-10% 5OVDC CER
CAPACITOR-FXD .OlUF +-10% 100VDC CER
CAPACITOR-FXD .1UF +-lo% 50VDC CER
CAPACITOR-FXD lOOOPF +-5% lOOVDC CER
28480
28480
28480
28480
0160-4835
0160-4832
0160-4835
0160-4822
A3C44
A3C45
A3C46
A3C47
A3C48
0160-4832
0160-4812
0160-4835
01604835
01604832
4
0
7
7
4
CAPACITOR-FXD .OlUF t 1 0 % 1WVDC CER
CAPACITOR-FXD 220PF +-5% 1WVDC CER
CAPACITOR-FXD .1UF +-lo% 5OVDC CER
CAPACITOR-FXD .1UF +-lo% 50VDC CER
CAPACITOR-FXD .OlUF +-lo% 100VDC CER
28480
28480
0160-4832
01604812
01604835
0160-4835
0160-4832
0160-4835
01606884
7
0
28480
28480
01604835
0160-6884
0160-4535
4
NOT ASSIGNED
CAPACITOR-FXD .1UF +-lo% 5OVDC CER
CAPACITOR-FXD 270PF +-1% 1WVDC CER
NOT ASSIGNED
CAPACITOR-FXD 1UF +-lo% 50VDC CER
28480
0160-4535
01604832
0160-4832
0160-4832
0160-4832
4
4
4
4
NOT ASSIGNED
CAPACITOR-FXD .OlUF +-loo/. lOOVDC CER
CAPACITOR-FXD .OlUF +-1O% lOOVDC CER
CAPACITOR-FXD .OWF +-io% IOOVDC CER
CAPACITOR-FXD .OlUF +-lo% 1WVDC CER
28480
28480
28480
28480
0160-4832
0160-4832
0160-4832
0160-4832
D
Q
~
.
Description
MfrCode
Mfr. Part Number
A3
2712A to 2942A
A3
A3
2948A and abow
A3
A3
A3C1
A3C2
A3C3
A3C4
A3C5
A3C49
A3C50
A3C51
A3C52-63
A3C64
A3C65-70
A3C71
A3C72
A3C79
A3C82
9
1
1
1
2
6
2
1
1
1
1
1
1
1
1
1
?Refer t o Section 7 for update information.
6-6
28480
28480
28480
'Factory Selected Component (Refer t o Section 5 ) .
A Errata part change
reu.OlNOV89
Replaceable Parts
Model 8904A
Table 6-3. Replaceable Parts
Reference
Designation
HP Part
Number
C
D
A3C83-89
A3C90
A3C93
A3c94-200
01604835
01604B35
7
7
A3C201
A3c202
Ax203
Ax204
A3C205
A3C206
Description
Mfr*
Code
Mfr. Part Number
NOT ASSIGNED
CAPACITOR-FXD .1UF +-lo% 50VDC CER
CAPACITOR-FXD .1UF +-1O% 5OVDC CER
NOT ASSIGNED
28480
28480
0160-4835
0160-4835
01604832
01604835
0160-4832
0160-4832
01604832
0160-4832
CAPACITOR-FXD .OlUF +-lo% lWVDC CER
CAPACITOR-FXD .1 UF +-1O% 5OVDC CER
CAPACITOR-FXD .OlUF +-lo% 1WVDC CER
CAPACITOR-FXD .OlUF +-lo"/. lMWDC CER
CAPACITOR-FXD .OlUF +-lo% 1WVDC CER
CAPACITOR-FXD .OlUF +-lo% lWVDC CER
28480
28480
28480
28480
28480
28480
0160-4832
01604835
0160-4832
01604832
0160-4832
0160-4832
Ax207
A3c208
A3c209
A3C210
A3c211
01604832
01604832
01604832
0160-4835
01604832
CAPACITOR-FXD .01 UF +-1O% 1WVDC CER
CAPACITOR-FXD .OlUF +-1O% 100VDC CER
CAPACITOR-FXD .OlUF +-1O% lOOVDC CER
CAPACITOR-FXD .1 UF +-IO% 5OVDC CER
CAPACITOR-FXD .OlUF +-loo/. 1OOVDC CER
28480
28480
28480
28480
28480
0160-4832
0160-4832
0160-4832
0160-4835
0160-4832
A3c212
A3C213
A3C214
A3C215
Ax216
0160-4835
016c-4635
01604832
0160-4791
0160-4832
CAPACITOR-FXD .1 UF +-10% 5OVDC CER
CAPACITOR-FXD .1UF +-lo% 5OVDC CER
CAPACITOR-FXD .OlUF +-1O% 1OOVDC CER
CAPACITOR-FXD 1OPF +-5% 1OOVDC CER 0+30
CAPACITOR-FXD .OlUF +-loo/. lOOVDC CER
28480
28480
28480
28480
28480
0160-4835
0160-4835
0160-4832
0160-4791
01€0-4832
A3C217
A3C218
A3C219
A3C220
A3c221
0160-4807
0160-4535
01604789
01604832
01604832
3
CAPACITOR-FXD 33PF +-5% l00VDC CER 0+30
CAPACITOR-FXD 1UF +-1O% 5OVDC CER
CAPACITOR-FXD 15PF +-5% 1WVDC CER 0+30
CAPACITOR-FXD .01 UF +-lo% lOOVDC CER
CAPACITOR-FXD .OlUF +-lo% lOOVDC CER
28480
28480
28480
28480
28480
0160-4807
0160-4535
0160-4789
0160-4832
0160-4832
A3C222
A3C223
A3C224
A3C225
A3C226
0160-4832
28480
0160-4832
1
CAPACITOR-FXD .OlUF +-lo% lOOVDC CER
NOT ASSIGNED
CAPACITOR-FXD lOUF +-5% 50VDC MET-POLYC
CAPACITOR-FXD .1 UF +-lo% 50VDC CER
CAPACITOR-FXD .1UF +-lo% 50VDC CER
28480
28480
28480
0160-3563
0160-4835
0160-4835
A3c227
A3C228
A3C229
A3C230
A3C231
01604535
0160-0572
0160-0573
01604040
CAPACITOR-FXD 1UF +-1O% 5OVDC CER
CAPACITOR-FXD 22OOPF +-20% 100VDC CER
CAPACITOR-FXD 4700PF +-20% lWVDC CER
CAPACITOR-FXD 1OOOPF +-5% lWVDC CER
NOT ASSIGNED
28480
28480
28480
28480
01604535
0160-0572
0160-0573
0160-4040
A3C232
A3C233-299
A3C300
A3c301
A3C302
0160-4383
CAPACITOR-FXD 6.8PF +-.5PF 2OOVDC CER
NOT ASSIGNED
CAPACITOR-FXD 1UF +-lo% 5OVDC CER
CAPACITOR-FXD 1UF +-loo/. 50VDC CER
CAPACITOR-FXD .OlUF +-lo% lOOVDC CER
20932
5024E0200RD689D
28480
28480
28480
0160-4535
0160-4535
0160-4832
A3C303
A3c304
A3C305-400
A3C401
A3C402
01604832
0160-4791
28480
28480
01604832
0160-4791
28480
28480
0160-4795
0160-4835
2
1
01609563
0160-4835
0160-4835
1
01604535
0160-4535
01604832
0160-4795
01604835
8
7
3
CAPACITOR-FXD .OlUF +-IO% 1OOVDC CER
CAPACITOR-FXD lOPF +-5% lOOVDC CER 0+-30
NOT ASSIGNED
CAPACITOR-FXD 4.7PF +-.5PF 100VDC CER
CAPACITOR-FXD .1 UF +-lo% 5OVDC CER
?&fer to Section 7 for update information.
*Factory Selected Component (Refer to Section 5).
6-7
Replaceable Parts
Model 8904A
Table 6-3. Replaceable Parts
HP Part
Number
C
A3C403
A3C404
A3C405
A3C406
A3C407
0160-4835
0160-4835
0160-4832
0160-4832
0160-4832
7
7
A3C408
A3C409
A3C410
A3C411
A3C412
0160-4832
0160-4547
0160-4526
0160-4493
0160-4526
A3C413
A3C414-420
A3C421
A3C422
A3C423
0160-4547
8
0180-0116
0180-01 16
0180-0116
1
0180-01 16
0121-0451
0160-4789
1
3
0
0160-4832
4
0180-0116
01604832
0180-01 16
0160-4832
0180-01 16
1
4
1
Reference
Designation
A3C424
A3C425
A3C426
A3C425-430
A3C431
A3C432
A3C433
A3C434
A3C435
A3C436
D
4
4
4
4
8
3
3
3
Description
QW.
2
2
1
1
1
1
4
1
Mfr.
Code
Mfr. Part Number
CAPACITOR-FXD .1UF +-lo% 5OVDC CER
CAPACITOR-FXD.1UF +-lo% 5OVDC CER
CAPACITOR-FXD.OlUF +-lo% 100VDC CER
CAPACITOR-FXD .OlUF +-lo% lOOVDC CER
CAPACITOR-FXD.OlUF +-lo% lOOVDC CER
28480
28480
28480
28480
28480
0160-4835
0160-4835
0160-4832
0160-4832
0160-4832
CAPACITOR-FXD.OlUF +-lo% lOOVDC CER
CAPACITOR-FXD150PF +-5% ZOOVDC CER
CAPACITOR-FXD42PF +-5% POOVDC CER 0+-30
CAPACITOR-FXD 27PF +-5% ZOOVDC CER 0+-30
CAPACITOR-FXD 42PF +-5% ZOOVDC CER 0+-30
28480
28480
28480
28480
28480
0160-4832
01604547
0160-4526
0160-4493
01604526
CAPACITOR-FXD150PF +-5% POOVDC CER
NOT ASSIGNED
CAPACITOR-FXD6.8UF+-1Oo/o 35VDC TA
CAPACITOR-FXD6.8UF+-1O0/- 35VDC TA
CAPACITOR-FXD 6.8UF+-llW 35VDC TA
28480
01604547
56289
56289
56289
150D685X903562
150D685X903582
150D685X9035B2
CAPACITOR-FXD6.8UF+-10°/e 35VDC TA
CAPACITOR-V TRMR-AIR 1.7-11PF 175V
CAPACITOR-FXD15PF +-5% lOOVDC CER 0+-30
NOT ASSIGNED
CAPACITOR-FXD .OlUF +-10% lOOVDC CER
56289
74970
28480
150D685X903562
187-0106-028
0160-4789
28480
0160-4832
CAPACITOR-FXD6.8UF+-1Oo/o 35VDC TA
CAPACITOR-FXD.OlUF +-lo% lOOVDC CER
CAPACITOR-FXD6.8UF+-10% 35VDC TA
CAPACITOR-FXD .OlUF +-lo% lOOVDC CER
CAPACITOR-FXD6.8UF+-1Oo/o 35VDC TA
56289
28480
56289
28480
56289
150D685X9035B2
01604832
150D685X903582
0160-4832
150D685X903562
CAPACITOR-FXD .OlUF +-10% lOOVDC CER
CAPACITOR-FXD 6.8UF+-1Oo/o 35VDC TA
NOT ASSIGNED
CAPACITOR-FXD lOOPF +-5% lOOVDC CER
CAPACITOR-FXD 1OOPF+-5% lOOVDC CER
28480
56289
01604832
150D685X9035B2
28480
28480
0160-4801
0160-4801
A3C437
A3C438
AX439
A3C440
MC441
0160-4832
0180-01 16
4
01604801
0160-4801
7
7
A3W2
A3C443
A30614
A3C445
A3C446
01604795
0160-4795
0160-4801
0160-4801
0160-4801
8
8
7
7
7
CAPACITOR-FXD4.7PF +-SPF 1OOVDC CER
CAPACITOR-FXD 4.7PF +-.5PF 1OOVDC CER
CAPACITOR-FXD lOOPF +-5% lOOVDC CER
CAPACITOR-FXD lOOPF +-5% lOOVDC CER
CAPACITOR-FXD 1OOPF +-5% lOOVDC CER
28480
28480
28480
28480
28480
0160-4795
01604795
0160-4801
0160-4801
0160-4801
A3C447
A3C448
A3C449-499
AX500
A3C501
01604801
0160-4801
7
7
28480
28480
01604801
0160-4801
0160-3879
0160-3879
7
7
CAPACITOR-FXD lOOPF +-5% lOOVDC CER
CAPACITOR-FXDlOOPF +-5% 1OOVDC CER
NOT ASSIGNED
CAPACITOR-FXD .OlUF +-2O% lOOVDC CER
CAPACITOR-FXD .OlUF +-20% lOOVDC CER
28480
28480
0160-3879
01604879
A3C502
AX503
AX504
AX505
0160-3879
0160-3879
0160-4789
0160-4824
7
7
0
CAPACITOR-FXD .OlUF +-20% lOOVDC CER
CAPACITOR-FXD.OlUF +-20% 100VDC CER
CAPACITOR-FXD15PF +-5% lOOVDC CER 0+-30
CAPACITOR-FXD 680PF +-5% lOOVDC CER
26480
28480
28480
28480
0160-3879
0160-3879
0160-4789
0160-4824
A3CR1-5
A3CR6
A3CR7
A3CR8
A3CR9
1901-0028
1901-0028
1901-0050
1901-0050
NOT ASSIGNED
DIODE-PWR RECT 400" 750MA DO-29
DIODE-PWR RECT 400V 750MA DO-29
DIODE-SWITCHING8OV 200MA 2NS DO-35
DIODE-SWITCHING8OV 200MA 2NS DO-35
28480
28480
9N171
9N171
1901-0028
1901-0028
1N4150
1N4150
1
7
4
1
5
4
5
3
3
25
tRefer to Section 7 for update information.
6-8
'Factory Selected Component (Refer to Section 5).
Replaceable Parts
Model 8904A
% M e 6-3. Replaceable Parts
HP Part
Number
Reference
Designation
A3CRlO-16
A3CR17
MCRl8
A3CRl9-25
A3CR26
C
D
NOT ASSIGNED
DIODE-SWITCHING8OV 2WMA 2NS 00-35
DIODE-SWITCHING8OV 200MA 2NS DO-35
NOT ASSIGNED
DIODE-PWR RECT 400V 750MA DO-29
1901-0050
1901-0050
1901-0028
1901-0028
A3CR27
A3CR28-201
A3CR2M
A3CR203
A3CR204
1901-0518
1901-0518
1901-0518
5
A3CR205
A3CR206
A3CR207
A3CR208
A3CR209
1901-0518
A3CR210
A3CR211
A3CR212
A3CR213-299
A3CR300
1901-0050
1902-0627
1901-0518
A3CR301
A3CR302-403
A3CR404
A3CR405
A3CR406
1901-0050
3
1901-0050
1901-0050
1901-0050
3
A3CR407
A3CR408
A3CR409
A3CR410
A3CR411
1901-0050
1901-0873
1901-0873
1901-0873
1901-0873
3
8
8
8
8
1901-0050
3
1901-0050
3
5
3
3
4
Mfr*
Code
Mfr. Part Number
9N171
9N171
1N4150
1N4150
28480
1901-0028
28480
1901-0028
28480
28480
28480
1901-0518
1901-0518
1901-051 8
28480
1901-0518
9N171
1N4150
9N171
1N4150
DIODE-SWITCHING8OV 200MA 2NS DO35
DIODE-CUR RGLTR 1N5312 1WV DO-7
DIODE-SM SIG SCHOTTKY
NOT ASSIGNED
DIODE-SWITCHING8OV 200MA 2NS DO-35
9N171
04713
28480
1N4150
1N5312
1901-0518
9N171
1N4150
DIODE-SWITCHING8OV 200MA 2NS DO-35
NOT ASSIGNED
DIODE-SWITCHING8OV 200MA 2NS DO35
DIODE-SWITCHING8OV 200MA 2NS DO35
DIODE-SWITCHING8OV 200MA 2NS DO35
9N171
1N4150
9N171
9N171
9N171
1N4150
1N4150
1N4150
DIODE-SWITCHING8OV 200MA 2NS DO-35
DIODE-HV RECT WOV 1A
DIODE-HV RECT 600V 1A
DIODE-HV RECT 600V 1A
DIODE-HV RECT 600V 1A
9N171
28480
28480
28480
28480
1N4150
1901-0873
19014873
19014873
1901-0873
DIODE-PWR RECT 400V 750MA DO-29
NOT ASSIGNED
DIODE-SM SIG SCHOTTKY
DIODE-SM SIG SCHOTTKY
DIODE-SM SIG SCHOTTKY
DIODE-SM SIG SCHOTTKY
NOT ASSIGNED
DIODE-SWITCHING8OV 200MA 2NS DO-35
NOT ASSIGNED
DIODE-SWITCHING8OV 200MA 2NS DO-35
1901-0050
A3CR412414
Description
Qty.
NOT ASSIGNED
2712A to 2747A
A3CR415
A3CR416
A3CR417
A3CR418
1901-0050
1901-0050
1901-0050
1901-0050
DIODE-SWITCHING8OV 200MA 2NS DO35
DIODE-SWITCHING8OV 200MA 2NS DO35
DIODE-SWITCHING8OV 200MA 2NS 00-35
DIODE-SWITCHING8OV 200MA 2NS DO35
9N171
9N171
9N171
9N171
1N4150
1N4150
1N4150
1N4150
2817A and above
A3CR415
A3CR.116
A3CR417
A3CR416
1901-0880
1901-0880
1901-0880
1901-0860
DIODE-GEN PRP 125MA DO-35
DIODE-GEN PRP 125MA 00-35
DIODE-GEN PRP 125MA DO-35
DIODE-GEN PRP 125MA DO45
28480
28480
28480
28480
1901-0880
1901-0880
1901-0880
1901-0880
A3CR419
A3CR420
A3CR421
A3CR422
A3CR423
1901-0050
1901-0050
1901-0050
1901-0050
1902-0627
DIODE-SWITCHING8OV 200MA 2NS DO-35
DIODE-SWITCHING8OV 200MA 2NS DO35
DIODE-SWITCHING8OV 200MA 2NS DO-35
DIODE-SWITCHING8OV 200MA 2NS DO45
DIODE-CUR RGLTR 1N5312 1OOV DO-7
9N171
9N171
9N171
9N171
04713
1N4150
1N4150
1N4150
1N4150
1N5312
A3C R424
A3CR425
A3CR426
A3CR427
A3CR428
1902-0627
1902-0627
1902-0627
1901-0050
1901-0050
DIODE-CUR RGLTR 1N5312 1OOV DO-7
DIODE-CUR RGLTR 1N5312 1OOV DO-7
DIODE-CUR RGLTR 1NS312 lOOV DO-7
DIODE-SWITCHING8OV 200MA 2NS DO35
DIODE-SWITCHING8OV 200MA 2NS DO-35
04713
04713
04713
9N171
9N171
1N5312
1N5312
1N5312
1N4150
1N4150
t h f e r to Section 7 for update information.
rev.1 7MAY88
*Factory Selected Component (Refer to Section 5).
6-9
Replaceable Parts
Model 8904A
Table 6-3.Replaceable Parts
Reference
Designation
HP Part
Number
C
D
A3CR429
A3CR430
19010050
1901-0050
3
3
A31
A32
A33
12518601
7
1
1251-4670
12580141
1250-0835
2
3
3
3
1250-0835
1250-0835
12514670
12580141
1
1
2
A34
A35
A36
A37
2712A to 2942A
J8
2948A and abom
A3J8
8
1
Description
QW
8
Mfr*
Code
Mfr. Part Number
DIODE-SWITCHING8OV 200MA 2NS DO-35
DIODE-SWITCHING 80V 200MA 2NS DO45
9N171
9N171
1N4150
1N4150
CONN-POST TYPE ,100-PIN-SPCG W O N T
NOT ASSIGNED
CONNECTOR SPIN M POST TYPE
JUMPER-REMOVABLEFOR 0.025 IN sa PINS
CONNECTOR-RF SMC M PC 5 W H M
28480
12518601
28480
28480
28480
12514670
12580141
1250-0835
CONNECTOR-RF SMC M PC W H M
CONNECTOR-RF SMC M PC M O H M
CONNECTOR SPIN M POST TYPE
JUMPER-REMOVABLE FOR 0.025 IN sa PINS
28480
28480
28480
28480
12500835
12500835
12514670
1258-0141
28480
28480
12514670
12580141
CONNECTOR 3-PIN M POST TYPE
JUMPER-REMOVABLE FOR 0.025 IN sa PINS
NOT ASSIGNED
CONNECTOR-RF SMC M PC 5 W H M
CONNECTOR-RF SMC M PC 5 W H M
28480
28480
12514670
12580141
28480
28480
1250-0836
12500836
RELAY-REED 1A 500MA
RELAY-REED 1A 500MA
RELAY-REED 1A 500MA
RELAY-REED 1A 500MA
RELAY-REED 1A 500MA
l00VDC 5VDCCOlL
lOOVDC 5VDC-COIL
100VDC 5VDC-COlL
100VDC 5VDC-COIL
l00VDC 5VDC-COIL
88330
88330
88330
R9131-1
R9131-1
R9131-1
R9131-1
R9131-1
RELAY-REED 1A 500MA lOOVDC 5VDC-COIL
NOT ASSIGNED
RELAY 2C 5VDCCOlL .5A 125VAC
NOT ASSIGNED
RELAY-REED 1A 500MA l00VDC 5VDCCOIL
88330
R9131-1
28480
0490-1190
88330
R9131-1
RELAY-REED 1A 500MA l00VDC 5VDCCOIL
NOT ASSIGNED
RELAY-REED 1A 500MA l00VDC 5VDGCOlL
RELAY-REED 2A 2A lOOVDC 5VDCCOlL 200VA
RELAY-REED 2A 2A 100VDC 5VDCCOlL 200VA
88330
R9131-1
88330
15636
15636
R9131-1
R8777-1
R8777-1
INDUCTOR RF-CH-MLD 5.6UH 5%
INDUCTOR RF-CH-MLD 470NH 5%
INDUCTOR RF-CH-MLD 470NH 5%
INDUCTOR RF-CH-MLD 8.2MH 5%
INDUCTOR RF-CH-MLD 8.2MH 5%
28480
28480
28480
28480
28480
91003560
91003548
91003548
9100-1675
9100-1675
NOT ASSIGNED
1251-4670
12580141
CONNECTOR SPIN M POST TYPE
JUMPER-REMOVABLE FOR 0.025 IN sa PINS
(ADDED FOR OPTION 006)
2
8
A394200
NOT ASSIGNED
12514670
12580141
2
8
1250-0836
12500836
2
2
2
A3K1
A3K2
A3K3
A3K4
A3K5
0490-1608
04901608
0490-1608
0490-1608
04901 608
5
5
5
5
5
9
A3K6
A3K7
A3K8
A3K9
A3K10
0490-1608
5
0490-1190
0
0490-1608
5
A3K11
A3K12-400
A3K401
A3K402
A3K404
0490-1608
5
0490-1608
0490-1501
0490-1501
5
7
7
A3L1
A3L2
A3L3
A3L4
A3L5
9100-3560
91003548
9100-3548
9100-1675
9100-1675
6
0
0
0
A3L6
A3L7
A3L8
A3L9
A3L10
9100-1640
08904-80001
08904-80005
08904-80002
9100-1663
9
4
8
5
6
1
1
1
1
1
INDUCTOR RF-CH-MLD 160UH 5%
CL-V MIN 74.1UH
CL-V MIN 72.6UH
CL-V MIN 60.7UH
INDUCTOR RF-CH-MLD 2.7MH 5%
28480
28480
28480
28480
28480
9100-1640
08904-80001
08904-80005
08904-80002
91001663
A3L11
A3L12
A3L13-200
A3L201
A3L401
08904-80003
91003551
6
5
1
1
28480
28480
08904-80003
91003551
91003560
9140-0454
6
5
1
CL-V MIN 58.1UH
INDUCTOR RF-CH-MLD 1UH 5%
NOT ASSIGNED
INDUCTOR RF-CH-MLD 5.6UH 5%
INDUCTOR RF-CH-MLD l8UH 5% .166DX.385LG
28480
28480
9100-3560
9140-0454
A3L402
9100-3315
9
1
INDUCTOR RF-CH-MLD 820NH 5%
28480
91003315
A3MPl
A3MP2
A3MP3
A3MP4
A3MP5
1205-0213
1205-0213
1205-0213
1205-0213
4
4
4
4
0
4
HEAT SINK SGL TO-5/T039-CS
HEAT SINK SGL TO-5/T0-39-CS
HEAT SINK SGL TO-5fl039-CS
HEAT SINK SGL TO-5/TO-39-CS
INSULATOR-XSTR POLY1
28480
28480
28480
28480
28480
1205-0213
1205-0213
1205-0213
12050213
A3201
A3202J399
A3400
A3401
03400834
0
1
2
2
2
2
4
tRefer t o Section 7 for update information.
6-10
88330
88330
'Factory Selected Component (Refer t o Section 5 )
03400834
A Errata part change.
rev.01NO V89
Replaceable Parts
Model 8904A
Table 63. Replaceable Parts
Reference
Designation
HP Part
Number
C
D
QW.
MMP8
A3MP7
A3MP8
03404834
03404834
03404834
A301
-13
A3014
A3015
18544477
18530281
1
1
1854-0809
18530405
2
A301BA
A3Q17A
A3018A
m19A
A
3
m
18530659
1854-1177
i854-iin
16534659
185SC405
A3Q2lA
A3oi232
A3033A
A3a34-200
1854-1177
A3Q2
1
8
12
Mfr.
Code
Mtr. Part Number
INSUIATORXSFI POLW
INSUIATORXSlR POLYI
INSUIATORXSFI POLW
28480
28480
28480
03406834
TRANSISTOR NPN z t t z a SI
~ TOKI PD- m o w
TRANSISTOR PNP 2W907A SI TO18 PD-400MW
NOT AsSloNED
04713
04713
2N2222A
TRANSISTOR NPN 2Ft23WA SI TO18 PD 3 6 0 w
TRANSISTOR PNP SI PD-300MW FT-85OMHZ
28480
04713
1864-0809
%209
TRANSISTOR PNP S
I PD 625MW FT- 200MHZ
TRANSISTOR NPN SI P D - 6 2 5 W FT-20OMHZ
28480
28480
28480
28480
04713
18534659
1854-1177
18561177
18534659
2N4209
TRANSISTOR NPN S
I PD 625MW FT- MOMHZ
28480
1854-1 177
28480
18561177
Description
-
-
TRANSISTOR NPN S
I PD-625MW FT-200MHZ
TRANSISTORPNPSI P D - 6 2 5 W FT-ZOOMHZ
TRANSISTORPNPSI PD-WOMW FT-850MHZ
-
-
03406834
03404834
m 0 7 A
1854-1177
e
TRANSISTOR NPN SI PD 625MW FT- 200MHZ
A3(1xlA
1854-1177
8
TRANSISTOR NPN SI PD-625MW FT-200MHZ
28480
1654-1177
A30202A
A3Qzo3A
A30204A
A3am5A
A30206A
1854-1177
18530659
18534659
1854-1177
1854-1177
TRANSISTOR NPN S
I PD 625MW FT 200MHZ
TRANSISTORPNPSI PD-625MWFT-X)OMHZ
TRANSISTOR PNP S
I PD-625MW FT-200MHZ
TRANSISTOR NPN S
I PD-625MW FT-200MHZ
TRANSISTORNPNSIPD-625MWFT-MOMHZ
28480
28480
28480
28480
28480
1854-1177
1853-0659
18530659
1854-1177
1854-1177
A3(1207A
A30208A
A30209
A30210
A30300A
1854-1177
18530659
18550276
18554276
18530659
6
5
TRANSISTOR NPN S
I PD-625MW R-200MHZ
.TTRANSISTOR PNP S
I PD-625MW FT-MOMHZ
TRANSISTOR J-FET 2N4416A NCHAN WODE
TRANSISTOR J m 2N4416A NCHAN M O D E
TRANSISTOR PNP SI PD-625MW FT-200MHZ
28480
28480
04713
04713
28480
1854-1177
1853-0659
2N4416A
2N4416A
1853-0659
A3QjOl A
A3Qj02400
A-01
A30102
A30403
1854-1177
6
28480
18561177
18544813
1853-0462
1853-0462
5
8
8
TRANSISTOR NPN SI PD-625MW FT-rnOMHZ
NOT ASSIGNED
I TO39 PD- 1W
TRANSISTOR NPN 2N3501S S
TRANSISTOR PNP 2M3635 SI To39 PD 1W
TRANSISTOR PNP 2N3635 SI To39 PD 1W
28480
01295
01295
18544813
2N333635
2N3635
A30104
A30405A
A3040SA
A30107A
18544813
1854-1177
18534659
1854-1177
18534659
5
TRANSISTOR NPN 2 W 1 S S
I TO39 PD- 1W
I PD- 625MW FT-200MHZ
TRANSISTOR NPN S
TRANSISTOR PNP SI PD-625MW FT-200MHZ
TRANSISTOR NPN S
I PD-625MW FT-2OOMHZ
TRANSISTOR PNP S
I PD 625MW FT 200MHZ
28480
28480
28480
28480
28480
18544813
1854-1177
18530659
1854-1177
18530659
A3R1
A3R2
181OO2O4
0698-7236
07574417
0698-7248
0698-7248
NETWOF1K-RES 8-SIP 1.OK OHM X 7
RESISTOR 1K 1% . O W FTC-0+-100
RESISTOR562 1% .125WFTC-0+-100
RESlSTOR3.16K 1% .05WFTC-0+-100
RESlSTOR3.16K 1% .05WFTC-O+-100
11238
24546
24546
24546
24546
75081-FilK
C3-118-TO-100 1C
CTkll8-TOS62R-F
C3-118-TO3161-F
C2-118-TO-3161-F
A30408&
A3m
A3R4
A3R5
6
6
2
5
6
5
6
5
tRefer to Section 7 lor update information.
rev.01JUL91
-
2
2
-
--
-
-
*Factory Selected Component (Refer to Section 5 )
A Errata part change.
6-11
Model 8904A
Replaceable Parts
Table 6-3. Replaceable Parts
Reference
Designation
A3R6-8
A3R9
A3R10
A3Rll-39
A3R40
HP Part
Number
Description
0698-7205
0698-7205
0
0
5
0698-6782
6
5
A3R41
A31342
A3R43
A3R44
A3R45
A3R46
0698-6782
0698-8819
0698-6782
0698-6782
0698-7268
6
4
6
6
5
A3R47
A3R48
A3R49
A3R50
A3R51
0698-6782
0698-6320
0698-7260
0698-7280
0698-7232
6
8
7
1
3
A3R52
A3R53
A3R54
A3R55
A3R56
0698-7256
0698-7208
0698-7260
0698-7283
0698-7229
1
3
7
4
8
A3R57
A3R58
A3R59
A3R60
A3R61
0698-7231
0698-7212
0698-7239
0698-7243
0698-7219
2
9
0
6
6
A3R62
A3R63
A3R64
A3R65
A3R66
0698-7232
0698-7232
0698-7188
0698-7188
0698-7259
A3R67
A3R68
A3R69
A3R70
A3R71
0698-7236
0698-7209
0698-7248
0699-2234
0699-2235
7
4
1
7
8
A3R72
A3R73
A3R74
A3R75
A3R76
0699-2235
0699-0106
0699-2237
0699-2237
0698-6616
8
0
A3R77
A3R78
A3R79-111
A3R112
A3R113
0698-6348
0698-6348
0
0
6
0699-2233
0699-2236
6
9
2
1
NOT ASSIGNED
RESISTOR 51.1 1% .05W F TC=0+-100
RESISTOR 51.1 1% .05W F TC=O+-100
NOT ASSIGNED
RESISTOR 250 .1% .125W F TC=0+-25
Mfr. Part Number
24546
24546
C~-I/~TO-~IRI-F
C3-1/8-TO-51Rl-F
28480
0698-6782
RESISTOR 250 .1% .125W F TC=0+-25
RESISTOR 3.83 1% .125W F TC=O+-100
RESISTOR 250 .1% .125W F TC=0+-25
RESISTOR 250.1% .125W F TC=O+-25
RESISTOR 21.5K 1% .05W F TC=0+-100
NOT ASSIGNED
28480
28480
28480
28480
24546
0698-6782
0698-6819
06984782
0698-6782
C3-1/8-TO-2152-F
RESISTOR 250 . l % .125W F TC=0+-25
RESISTOR 5K .1% .125W F TC=0+-25
RESISTOR 10K 1% .05W FTC=O+-100
RESISTOR 68.1 K 1% .05W F TC=0+-100
RESISTOR 681 1% .05W F TC=0+-100
28480
03888
24546
24546
24546
0698-6782
PME55-1/8-T9-500l-B
C3-1/8-T0-1002-F
C3-1/8-TO-6812-F
C3-1/8-TO-681R-F
1
5
RESISTOR 6.81 K 1% .05W F TC=0+-100
RESISTOR 68.1 1%.05W FTC=O+-100
RESISTOR 10K 1% .05W FTC=0+-100
RESISTOR 90.9K 1% .05W F TC=O+-lOO
RESISTOR 511 1% .OSW F TC=O+-lOO
24546
24546
24546
24546
24546
C3-1/ E T 0 9 1 1-F
C3-l/ETO-68Rl-F
C3-1/8-TO-1002-F
C3-1/8-TO-9092-F
C3-1 /E-TO-51 1R-F
1
1
1
1
2
RESISTOR 619 1% .05W F TC=0+-100
RESISTOR 100 1% .05W F TC=O+-100
RESISTOR 1.33K 1% .05W F TC=O+-100
RESISTOR 1.96K 1% .05W F TC=0+-100
RESISTOR 196 1% .05W F TC=0+-100
24546
24546
24546
24546
24546
C3-l/ETO-619R-F
C3-1/8-TO-100R-F
C3-1/8-TO-1331-F
C3-1/8-T&1961-F
C3-1/8-TO-196R-F
3
3
8
2
4
1
RESISTOR 681 1% .05W FTC=O+-100
RESISTOR 681 1% .05W F TC=O+-lOO
RESISTOR 10 1% .05W F TC=O+-100
RESISTOR 10 1% .05W F TC=0+-100
RESISTOR 9.09K 1% .05W F TC=0+-100
24546
24546
24546
24546
24546
C3-1/8-TO-681R-F
W l / E T 0 - 6 8 1 R-F
C3-l/ETO-lOR-F
C3-1/8-TO-lOR-F
C3-1/ETO-9091-F
RESISTOR 1K 1 % .05W F TC=0+-100
RESISTOR 75 1% .05W F TC=O+-100
RESISTOR 3.16K 1% .05W F TC=O+-lOO
RESISTOR 7.968K .1% .125W TF TC=0+-25
RESISTOR 1.133K .1% .125W TF TC=0+-25
24546
24546
24546
19701
19701
C3-1/8-TO-lOOl-F
C3-1/ETO-75RO-F
C51/aTO-3161-F
5033R
5033R
RESISTOR 1.133K .1% .125W TF TC=0+-25
RESISTOR 1.875K .1% .125W F TC=0+-25
RESISTOR 1.667K .1% .125W TF TC=0+-25
RESISTOR 1.667K .1% .125W TF TC=0+-25
RESISTOR 750.1% .125W F TC=0+-25
19701
28480
19701
19701
28480
5033R
0699-0106
5033R
5033R
0698-6616
RESISTOR 3K .1% .125W F TC=0+-25
RESISTOR 3K .1% .125W F TC=0+-25
NOT ASSIGNED
RESISTOR 50.4 .1% .5W TF TC=0+-25
RESISTOR 6.4K .1% .125W TF TC=0+-25
28480
28480
0698-6348
0698-6348
19701
19701
5053R
5033R
8
8
0
5
1
1
1
4
1
7
2
1
1
1
2
1
2
2
?Refer to Section 7 for update information.
6-12
Mfr.
Code
*Factory Selected Component (&fer to Section 5).
Model 8904A
Replaceable Parts
!Cable 6-3.Replaceable Parts
Reference
Designation
HP Part
Number
C
D
A3R114
A3R115- 121
A3R122
A3R123
A3R124
0699-2233
6
0698-7276
0698-7252
5
7
A3R125
A3R126
A3R127- 135
A3R136
A3R139
A3R140
A3R141
A3R142
A3R 143
A3R201
0698-7266
0757-0417
Description
1
1
1
0698-7229
0698-7229
RESISTOR 50.4 .lo,
.5W TF TC=O+-25
NOT ASSIGNED
RESISTOR 46.4K 1% .05W F TC=0+-100
RESISTOR 4.64K 1% .05W F TC=0+-100
NOT ASSIGNED
RESISTOR 17.8K 1% .05W F TC=0+-100
RESISTOR 562 1% ,125W F TC=0+-100
NOT ASSIGNED
RESISTOR 511 1% .05W F TC=O+-100
RESISTOR 511 1% .05W F TC=0+-100
Mfr.
Code
Mfr. Part Number
19701
5053R
24546
24546
C3-1/8-T0-4642-F
C3-1/8-TO-4641-F
24546
24546
24546
24546
C3-1/8-TO-511R-F
C3-118-TO-511R-F
24546
24546
C3-1/8-T0-3161-F
C3-1/8-TO-196R-F
0698-7232
NOT ASSIGNED
RESISTOR 3.16K 1% .05W F TC=0+-100
RESISTOR 196 1% .05W F TC=0+-100
NOT ASSIGNED
RESISTOR 681 1% .05W F TC=0+-100
24546
C3-1/8-TO-681R-F
A3R202
A3R203
A3R204
A3R205
0698-7232
0698-7232
0698-7232
0698-7205
RESISTOR 681 1% .05W F TC=0+-100
RESISTOR 681 1% .05W F TC=O+-100
RESISTOR 681 1% .05W F TC=O+-100
RESISTOR 51.1 1% .05W F TC=O+-lM)
24546
24546
24546
24546
C3-1/8-TO-MIlR-F
C3-1/&TO-681 R-F
C3-l/&TO-681 R-F
C3-1 /8-TO-51R1-F
A3R206
A3R207
A3R208
A3R209
A3R210
0698-7205
0698-7256
0698-7257
0757-0420
0698-6616
RESISTOR 51.1 1% .05W F TC=0+-100
RESISTOR 6.81K 1% .05W F TC=0+-100
RESISTOR 7.5K 1% .05W F TC=O+-lOO
RESISTOR 750 1% .125W F TC=0+-100
RESISTOR 750.1% ,125W F TC=0+-25
24546
24546
24546
24546
28480
C3-1/&TO-51Rl-F
C3-1/8-T0-68ll-F
csi / 8 - ~ 1 m o-Fi
cT4-1/8-~0-751
-F
0698-6616
A3R211
A3R212
A3R213
A3R214
A3R215
0698-7229
0698-7229
0698-7225
RESISTOR 511 1% .05W F TC=O+-lOO
RESISTOR 511 1% .05W F TC=0+-100
RESISTOR 348 1% .05W F TC=O+-100
NOT ASSIGNED
NOT ASSIGNED
24546
24546
24546
C~-~/~-TO-~~IR-F
C3-1/8-T0-511R-F
C3-1/&TO-348R-F
A3R216
A3R217
A3R218
A3R219
A3R220
0698-7277
0698-7277
0698-7277
0698-7277
0698-7284
5
RESISTOR 51.1K 1% .05W FTC=O+-100
RESISTOR 51.1K 1% .05W F TC=O+-lOO
RESISTOR 51.1K 1% .05W FTC=O+-100
RESISTOR 51.1K 1% .05W F TC=0+-100
RESISTOR lOOK 1% .05W F TC=O+-lbO
24546
24546
24546
24546
24546
C3-1/8-T0-5112-F
Wl/kT0-5112-F
C3-1/8-T0-5112-F
C3-1/8-T0-5112-F
C3-1 /8-TO-lOO3-F
A3R221
A3R222
A3R223
A3R224
A3R225
0698-7198
0698-7220
0698-7205
2100-3296
0698-7248
1
RESISTOR 26.1 1% .05W F TC=0+-100
RESISTOR 215 1% .05W F TC=0+-100
RESISTOR 51.1 1% .05W F TC=0+-100
RESISTOR-TRMR 1K 10% C TOP-ADJ 17-TRN
RESISTOR 3.16K 1% .05W F TC=O+-100
24546
24546
24546
28480
24546
C3-1/8-TO-26Rl-F
C3-l/kTO-215R-F
C3-1/8-TO-51R1-F
2100-3296
C3-1/8-T0-3161-F
A3R226
A3R227
A3R228
A3R229
A3R230
0698-7248
0757-0394
0698-7277
2100-3659
0698-3457
RESISTOR 3.16K 1% .05W F TC=0+-100
RESISTOR 51.1 1% .125W F TC=0+-100
RESISTOR 51.1K 1% .05W FTC=O+-lW
RESISTOR-TRMR 20K 10% C TOP-ADJ 17-TRN
RESISTOR 316K 1% ,125W F TC=0+-100
24546
24546
24546
28480
28480
C3-1/8-TO-3161 -F
CT4-1/8-TO-51Rl-F
C3-1/8-T0-5112-F
2100-3659
0698-3457
-200
0698-7248
0698-7219
1
6
1
1
1
1
1
1
3
2
1
tRefer to Section 7 for update information.
0
*Factory Selected Component (Refer to Section 5).
6-13
~
~
Replaceable Parts
Model 8904A
Table 6-3. Replaceable Parts
Reference
Designation
A3R231
A3R232
A3R233
A3R234-299
A3R300
HP Part
Number
C
D
atv.
069a7275
069a7260
0698-7260
4
7
7
1
0698-7246
1
A3R301
A3R302-399
A3R400
A3R401
A3R402
0698-7246
1
069a8821
06988821
0698-8821
8
8
A3R403
A3R404
A3R405
A3R406
A3R407
069a7240
0698-7267
0698-7267
0698-7240
3
4
4
3
A3R408
A3R409
A3R410
A3R411
A3R412
06987240
0698-7267
069a7267
0698-7240
0698-6362
3
4
4
3
8
3
A3R413
A3R414
A3R415
A3R416
A3R417
0698-6317
owam17
069a-2
069a8822
0757-0462
3
2
9
3
1
2
A3R418
A3R419
A3R420
A3R421
A3R422
2100-3659
0757-0401
0757-0401
0698-6362
0757-0462
7
0
0
8
3
A3R423
A3R424
A3R425 -445
0757-0280
0757-0280
3
3
A3R446
069a6624
0699-1728
5
2
A3R448
A3R449
A3R450
A3R451
A3R452
069E6624
0699-1728
2
0698-3430
5
A3R453
A3R454
A3R455
A3R456
A3R457
0698-3430
0699-1726
0698-6348
0698-6348
0698-6348
5
0
0
0
0
A3R447
8
3
8
Description
RESISTOR 42.2K 1% .05W F TC=0+-100
RESISTOR 10K 1% .05W F TC=O+-lM)
RESISTOR 10K 1% .05W F TC=0+-100
NOT ASSIGNED
RESISTOR 3.16K 1% .05W F TC=O+-100
Mfr. Part Number
24546
24546
24546
‘23-1 /8-TO-4222-F
C3-1/8-TO-1002-F
W-1E-TO-1002-F
24546
C3-1/8-TO-316l-F
RESISTOR 3.16K 1% .05W F TC=O+-100
NOT ASSIGNED
RESISTOR 5.62 1% ,125W F TC=0+-100
RESISTOR 5.62 1% .125W FTC=O+-lOO
RESISTOR 5.62 1% .125W F TC=0+-100
24546
C3-1/8-TO-3161-F
28480
28480
28480
069a8821
0698-8821
069amzi
NOT ASSIGNED
RESISTOR 1.47K 1% .05W F TC=0+-100
RESISTOR 19.6K 1% .05W FTC=0+-100
RESISTOR 19.6K 1% .05W F TC=0+-100
RESISTOR 1.47K 1% .05W F TC=0+-100
24546
24546
24546
24546
C3-1/8-TO-1 471-F
C3-1/8-TO-1962-F
C3-118-TO-1962-F
C3-1/8-TO-1471-F
RESISTOR 1.47K 1% .05W F TC=O+-100
RESISTOR 19.6K 1% .05W F TC=0+-100
RESISTOR 19.6K 1% .05W F TC=0+-100
RESISTOR 1.47K 1% .05W F TC=0+-100
RESISTOR 1K .1% .125W F TC=0+-25
24546
24546
24546
24546
28480
C3-1/8-TO-1471-F
C3-1/8-TO-l962-F
C3-1/8-T0-1962-F
C3-1/8-TO-1471-F
0698-6362
RESISTOR 500.1% .125W F TC=0+-25
RESISTOR 500 .1% .125W F TC=0+-25
.125W F TC=0+-25
RESISTOR 1K .lo,
RESISTOR 6.81 1% .125W F TC=0+-100
RESISTOR 75K 1% .125W F TC=O+-100
03888
03688
28480
28480
24546
PME551/8-T9-500R-B
PME55-1/8-T9-500R-B
0698-6362
0698-8822
CT4-1/8-T0-7502-F
RESISTOR-TRMR 20K 1Ph C TOP-ADJ 17-TRN
RESISTOR 100 1% .125W F TC=O+-100
RESISTOR 100 1% .125W F TC=0+-100
.125W F TC=O+-25
RESISTOR 1K .I%
RESISTOR 75K 1% .125W F TC=0+-100
28460
24546
24546
28480
24546
2100-3659
CT4-1/8-TO-lOl-F
CT4-1/8-TO-lOl-F
06986362
CT4-1/8-TO-7502-F
2
RESISTOR 1K 1% .125W F TC=O+-100
RESISTOR 1K 1% .125W F TC=O+-lOO
24546
24546
CT4-1/&TO-lOOl -F
CT4-1/8-TO-1001-F
2
2
RESISTOR 2K .1% .125W F TC=0+-25
RESISTOR 2.652K .1% .12W
28480
28480
06986624
0699-1726
28480
28480
06986624
0699-1728
4
RESISTOR 2K .1% .125W F TC=0+-25
RESISTOR 2.652K .1% .12W
NOT ASSIGNED
NOT ASSIGNED
RESISTOR 21.5 1% .125W F TC=0+-100
03868
PME55-1/8-TO-21R5-F
RESISTOR 21.5 1% .125W F TC=0+-100
RESISTOR 1.15OK .1% .12W
RESISTOR 3K .1% .125W F TC=0+-25
RESISTOR 3K .1% .125W F TC=0+-25
RESISTOR 3K .1% .125W F TC=0+-25
03888
28460
28480
28480
28480
PME55-1/8-TO-21RS-F
0699-1726
0698-6346
0698-6348
0698-6348
4
4
4
2
5
2
?Refer to Section 7 for update information.
6-14
Mfr.
Code
*Factory Selected Component (Refer to Section 5)
Replaceable Parts
Model 8904A
Table 6-3. Replaceable Parts
Reference
Designation
HP Part
Number
A3R458
A3R459
A3R460
A3R461
06984348
069awo
069awo
0699-1726
A3R462-465
A3R466
A3R467
A3R466
A3R469
0757-0379
0757-0379
0757-0379
0757-0379
C
D
Mfr.
Code
Description
Mfr. Part Number
RESISTOR 3K .lob.125W F TC=O+-25
RESISTOR 21.5 1%.125W F TC=0+-100
RESISTOR 21.5 1% .125W F TC=0+-100
RESISTOR 1.150K .1% .12W
28480
03888
03888
28480
06986348
PME55-1/8-TO-21 R5-F
PME55-1/&TO-21 R5-F
0699-1726
NOT ASSIGNED
RESISTOR 12.1 1% .125W F TC=O+-100
RESISTOR 12.1 1% .125W F TC=O+-100
RESISTOR 12.1 1% .125W F TC=O+-100
RESISTOR 12.1 1% .125W F TC=0+-100
19701
19701
19701
19701
50337-1/8-TO-l2Rl -F
5 W R - 1IaTO-12R1-F
5O33R-1/ETO-l2Rl -F
5033R-1/BTO-l 2R1-F
RESISTOR 25.42 .1% .75W PW TC=0+-20
RESISTOR 25.42 .1% .75W PW TC=O+-20
NOT ASSIGNED
RESISTOR 1M 1% .125W F TC=O+-lW
91637
91637
NS-1/2
NS-1/2
28480
069a8827
0757-0123
RESISTOR 34.8K 1% .125W F TC=O+-100
28480
0757-0123
0757-0199
RESISTOR 21.5K 1%.125W F TC=O+-lOO
28480
0757-0199
A3R492
06984827
RESISTOR 1M 1% .125W F TC=O+-100
28480
069am27
27IZA to 2747A
A3R493
A3R494
A3R495
0757-0123
0757-0276
0757-0278
RESISTOR 34.8K 1% .125W F TC=0+-100
RESISTOR 1.78K 1% .125W F TC=O+-100
RESISTOR 1.78K 1% .125W F TC=O+-lOO
28480
24546
24546
0757-0123
CT4-1/ETO-1781-F
CT4-1/&TO-1781-F
2817A and d o v e
A3R493
A3R494
A3R495
0757-0199
0698-0085
069a0085
RESISTOR 21.5K 1% .125W FTC=O+-100
RESISTOR 2.61K 1% .125W FTC=O+-100
RESISTOR 2.61K 1% .125W F TC=O+-lOO
28480
24546
24546
0757-0199
c ~ 4 - i / a ~ o 21-F
6i
C T ~ -/1a ~ o m
1-F
A3R496
0757-0394
RESISTOR 51 ,l1% .125W F TC=0+-100
24546
CTCl/ETO-51Rl-F
A3R497
A3R498
A3R499
0757-0394
RESISTOR 51.1 1% .125W F TC=O+-lOO
NOT ASSIGNED
RESISTOR 5.62 1% .125W F TC=0+-100
24546
CT4-1/8-T0-51R1-F
28480
m g a w i
28480
08904-80004
15542
T1-1T-X65
CONNECTOR-SGL CONT PIN 1.14-MM-BSC-SZ SQ
CONNECTOR-SGL CONT PIN 1.14-MM-BSC-SZ SQ
CONNECTOR-SGL CONT PIN 1.14-MM-BSC-SZ SQ
CONNECTOR-SGL CONT PIN 1.lCMM-BSC-SZ SQ
CONNECTOR-SGL CONT PIN 1.lQMM-BSCSZ SQ
28480
28480
28480
28480
28480
1251-0600
1251-0600
1251-OW0
1251-OW0
1251-0600
28480
28480
1251-0600
1251-0600
1251-0600
28480
1251-0600
28480
1251-0600
01295
SN74ALS74AN
01295
01295
SN74ALS174N
SN74ALS174N
A3R470
A3R471
A3R472-489
A3R490
271ZA to 2747A
A3R491
2817A and d o v e
A3R491
4
0811-3726
0811-3726
4
4
069a8827
4
3
9
9
069a882i
A3T1
A3T2-399
A3T400
08904-80004
1
9100-4444
1
A3TP1
A3TP2
A3TP3
A3TP4
A3TP5
1251-0600
1251-0600
1251-0600
1251-0600
1251-0600
A3TP403
A3U1
A3U2
A3U3
A3U4
A3U5
10
0
0
0
0
0
1251-0600
0
CONNECTOR-SGL CONT PIN 1.14-MM-BSCSZ SO
CONNECTOR-SGL CONT PIN 1.14-MM-BSCSZ SQ
CONNECTOR-SGL CONT PIN 1.lCMM-BSC-SZ SQ
NOT ASSIGNED
CONNECTOR-SGL CONT PIN 1.14-MM-BSC-SZ SO
1251-0600
0
CONNECTOR-SGL CONT PIN 1.1CMM-BSC-SZ SO
1820-2488
1
1820-3465
1820-3465
2
NOT ASSIGNED
IC FF l T L ALS D-PIPE POS-EDGE-TRIG
NOT ASSIGNED
IC FF TTL ALS D-PIPE POS-EDGE-TRIGCOM
IC FF lTL ALS D-TYPE POS-EDGE-TRIGCOM
?Refer to Section 7 for update information.
rev.17MAY88
OHMS;INPUT
1251-0600
1251-0600
1251-0600
A3TP6
A3TP7
A3TP8
A3TP9-401
A3TP402
0
0
0
XFMR POT CORE
NOT ASSIGNED
TRANSFORMER-RF INPUT IMP.:50
28480
"Factory Selected Component (Refer to Section 5).
6-15
Replaceable Parts
Model 8904A
Table 6-3. Replaceable Parts
Reference
Designation
A3U6
A3U7
A3U8
A3U9
A3U 10
A3U11- 15
A3U16
A3U17-200
A3U201
A3U202
A3U203
A3U204-400
A3U401
A3U402
A3U403
A3U404
A3U405
A3U408
-407
A3VR1-18
A3VR19
A3VR20-30
A3VR31
A3VR32 200
-
HP Part
Number
C
D
1826-1013
0
1
1858-0047
1826-1049
18550047
5
2
5
2
1
1810-0556
1
Description
Mfr. Part Number
D/A 12-1/2-BIT 24-DIP-C BPLR
NOT ASSIGNED
TRANSISTOR ARRAY 16-PIN PLSTC DIP
IC OP AMP PRCN 8-DIP-C PKG
TRANSISTOR ARRAY 1 6 - p P
~ L~s r c DIP
24355
AD565AJD
13606
06665
13606
ULN-2003A
OP-27GZ
ULN-2003A
1
DELAY LINE ACTIVE DELAY LINE l T L
07393
lTLDL-GO(SELECTED)
1901-1011
1826-1067
2
1
DIODE-ARRAY 25MA VF DIFF=BMV
IC INSTM AMPL CUR 10-DIP-P PKG
28480
27014
1901-1011
LH0002CN
1826-1557
1
IC OP AMP LOW-BIAS-H-IMPD 8-DIP4 PKG
27014
LF356BJ
1826-1665
1826-1665
1826-1665
3
IC OP AMP HS 8-DIP-C PKG
IC OP AMP HS &DIP-C PKG
IC OP AMP HS &DIP-C PKG
27014
27014
27014
LM6361J(SELECTED)
LM6361J(SELECTED)
LM6361J(SELECTED)
IC INSTM AMPL CUR 10-DIP-P PKG
NOT ASSIGNED
IC COMPARATOR GP QUAD 14-DIP-C PKG
27014
LH0002CN
04713
LM339J
28480
1902-0967
28480
1902-0962
28480
1902-0957
28480
1902-0957
28480
1902-0944
04713
04713
1N6273A
1N6273A
1826-1067
1826-0759
9
1902-0967
3
1902-0962
8
1902-0957
1
1
NOT ASSIGNED
DIODE-ZNR 24V 5% DO-35 PD=.4W TC=+.094%
NOT ASSIGNED
DIODE-ZNR 15V 5% DO-35 PD=.4W TC=+.087%
NOT ASSIGNED
A3VR201
A3VR202-205
A3VR206
A3VR207
A3VR208
1902-0957
1
1902-0944
6
DIODE-ZNR 9.1V 5% DO-35 PD=.4W TC=+.069%
NOT ASSIGNED
DIODE-ZNR 9.1V 5% 00-35 PD=.IW TC=+.O69%
NOT ASSIGNED
DIODE-ZNR 2.7V 5% 00-35 PD=.4W TC=-.044%
A3VR209-400
A3VR401
A3VR402
1902-1397
1902-1397
5
5
NOT ASSIGNED
VOLTAGE SUPPRESSOR VR=lO.ZV BV=11.4V MIN
VOLTAGE SUPPRESSOR VR=10.2V BV=l1.4V MIN
2
tRefer to Section 7 for update information.
6-16
Mfr.
Code
*Factory Selected Component (Refer to Section 5).
Model 8904A
Replaceable Parts
n b l e 6-3. Replaceable Parts
Reference
Designation
HPPart
Number
C
D
Description
08904-61001
4
1
POWERSUPPLYASSEMBLY
28480
08904-61001
1-1197
8
1
LCDASSEMBLY
28480
1990-1197
TRANSFORMERBOARD
28480
08904-60104
Mfr.
Code
Mfr. Part Number
A4
A4
A5
A5
A6
271211 To 2942A
A6
2948A und above
A6
0890460104
6
1
A6C1
A6C2
A6C3
01604822
01604810
01-5
2
8
1
1
CAPACITOR-FXD 1OOOPF +-5% l00VDC CER
CAPACITOR-FXD 33OPF +-5% 100VDC CER
CAPACITOR-FXD 47PF +-5% 100VDC CER 0+-30
28480
28480
28480
01604822
0160-4810
0160-4805
A6J1
A612
A6J3
AW4
A6J5
12500836
12500836
12500836
12500836
1252-2235
2
4
CONNECTOR-RFSMCMPCSOOHM
CONNECTOR-RF SMC M PC SOOHM
CONNECTOR-RF SMC M PC W H M
CONNECTOR-RF SMC M PC SOOHM
CONNECTORPOST TYPE .I
W-PIN-SPCG K O N T
28480
28480
28480
28480
28480
1250-0836
12500836
1250-0836
125W836
1252-2235
A6R1
A6R2
A6R3
A6R4
A6R5
21ooo545
07574280
07574420
07570290
21W755
4
3
3
5
4
1
1
1
1
1
RESISTOR-TRMR 1K 10% C SIDE-ADJ 17-TURN
RESISTOR 1K 1% .125W F TC=0+-100
RESISTOR 750 1% .125W F TC=O+-lW
RESISTOR 6.19K 1 % .125W F TC=Ot100
RESISTOR-TRMR 50 10% C SIDE-ADJ 17-TURN
32997
24546
24546
19701
28480
3292X-1-102
CT4-1/&TO1 001-F
CT4-1/&TO751 -F
MF4C1/5T0-6191-F
21003755
A6R6
A6R7
06988823
07570180
0
2
1
1
RESISTOR 8.25 1 % .125W F TC=O+-lW
RESISTOR 31.6 1 % .125W FTC=O+-100
28480
28480
06988823
0757-0180
A6VRl
A6VR2
19024960
19024960
6
6
2
2
DIODE-ZNR 12V 5% DO35 PD=.4W TC=+.O77%
DIODE-ZNR 12V 5% D(135 PD=.4W TC=+.077%
28480
28480
19020960
19024960
NOT ASSIGNED
2
2
2
3
tRefer to Section 7 for update information
rev.01NOV89
(ADDED FOR OPTION 006)
'Factory Selected Component (Refer t o Section 5 )
A Errata part change.
6-1 7
Model 8904A
Replaceable Parts
n b l e 6-3. Replaceable Parts
Reference
Designation
HPPart
Number
C
D
w’
A7-A9
Description
MfrCode
Mfr. Part Number
NOT ASSIGNED
A10
Note: The A10 and A3 Assemblies are identical. Refer to A3 for individual component part numbers.
tRefer t o Section 7 for update information
6-18
*Factory Selected Component (Refer t o Section 5)
A Errata part change.
reu.OlNOV89
Model 8904A
Reference
Designati on
Replaceable Parts
HPPart
Number
%ble 6-3.Replaceable Parts
C
D
atv.
Description
Mfr.
Code
Mfr. Part Number
Miscellaneous Parts
B1
08904-61010
5
1
FANASSY 12VDC
28480
08904-61010
F1
21104003
0
1
FUSE 3A 250V NTD 1.25X.25 UL
(INCLUDED WHEN ORDERING W1)
75915
312003
2712A to 2917A
SI
3101-2216
3
1
26480
3101-2216
5041-1682
9
1
SWITCH-PB DPDT ALTING 4A 25OVAC
(INCLUDED WHEN ORDERING W1)
KEYCAP FOR LINE SWITCH
(INCLUDED WHEN ORDERING W1)
3101-2216
3
1
26480
3101-2216
0371-3602
3
1
SWITCH-FB DPDT ALTING 4A 25OVAC
(INCLUDED WHEN ORDERING W1)
KEYCAP FOR LINE SWITCH
(INCLUDED WHEN ORDERING Wl)
T1
9100-4833
8
1
AUDIOTRANSFORMER
28480
91004833
2712A to 2917A
Wl
08904-61005
8
WIRING HARNESS
28480
0890661005
2923A and &ow
WI
08904-61022
9
1
WIRING HARNESS
(LINE POWER/A4P1 TO POWER SWITCH)
26480
0890661022
w2
08904-61007
0
6
28480
0890461007
w3
08904-61007
0
6
28480
0890441007
w4
08904-61007
0
6
COAXCABLEBNCPCB
(-400 TO REAR PANEL OUT 1 HIGH)
COAXCABLEBNCPCB
(-401
TO REAR PANEL OUT 1 LOW)
COAXCABLEBNCPCB
(OPTION 002/004)
(AlOJ400 TO REAR PANEL OUT 2 HIGH)
28480
08904-61007
w5
08904-61007
0
6
28480
08904-61007
W6
08904-61007
0
6
28480
0890461007
w7
08904-61007
0
6
26480
08904-61007
W8
08904-61007
0
6
28480
0890461007
w9
08904-61007
0
6
26480
0890441007
w10
089C4-61007
0
6
COAXCABLEBNCPCB
(ADDED FOR OPTION 002)
(A105400 TO FRONT PANEL OUT 2 HIGH)
COAXCABLEBNCPCB
(ADDED FOR OPTION 002)
(A1W401 TO FRONT PANEL OUT 2 LOW)
COAXCABLEBNCPCB
REAR PANEL 10 MHZ E X l REF IN TO A U l O l )
28480
0890441007
w11
08904-61007
0
6
0890661007
08904-61 009
3
1
26480
0890661009
W13
08904-61003
6
1
COAXCABLEBNCPCB
(A2J102 TO REAR PANEL 10 MHZ REF OUT)
LINE VOLTAGE SELECTION CABLE
REAR PANEL VOLTAGE SELECT TO A4P4)
RIBBON CABLE (24 CONDUCTOR)
REAR PANEL HP-IB TO AU31
28480
w12
28480
08904-61003
2923A and h u e
SI
:Refer to Section 7 for update information.
rev.OlNOV89
COAX CABLE BNCPCB (REAR PANEL OUTPUT)
(OPTION 002/006)
(A1OJ401 TO REAR PANEL OUT 2 LOW)
COAXCABLEBNCPCB
( W 4 0 0 TO FRONT PANEL OUT 1 HIGH)
COAXCABLEBNCPCB
(AU401 TO FRONT PANEL OUT 1 LOW)
'Factory Selected Component (Refer to Section 5 ) .
A Errata part change.
6-18.1
Model 8904A
Replaceable Parts
%ble 6-3. Replaceable Parts
HPPart
Number
C
D
QW
W14
0890461004
7
1
W15
0890461006
9
1
W16
0890461008
1
1
W17
08904-61008
1
1
Reference
Designation
2932A to 2942A
WI8-w25
2948A and &ow
W18
50614837
4
1
WI9
5061-4837
4
1
w20
08904-61015
0
1
w21
08904-61015
0
1
W22
08904-61007
0
1
w23
08904-61007
0
1
w24
08904-61007
0
1
w25
0890461007
0
1
RIBBON CABLE (16 CONDUCTOR)
REAR PANEL DIGITAL PORT TO A2J4)
POWER SUPPLY WIRING HARNESS
(A4F3 TO A2J7)
RIBBON CABLE (34 CONDUCTOR)
(A2J5 TO A3J1)
RIBBON CABLE (34 CONDUCTOR)
(ADDED FOR OPTION 002)
(A2J6 TO AlW1)
Mfr.
Code
Mfr. Part Number
28480
0890461004
28480
08904-61006
28480
0890461008
28480
0890461008
28480
5061-4837
28480
5061437
28480
0890461015
28480
08904-61015
28480
0890461007
28480
0890461007
28480
08904-61W7
28480
0890661007
NOT ASSIGNED
+Refer t o Section 7 for u p d a t e i n f o r m a t i o n .
6-18.2
Description
COAX CABLE FEMALE SMCSMC
(ADDED FOR OPTION 006)
(A3400 TO A6J1)
COAX CABLE FEMALE SMCSMC
(ADDED FOR OPTION 006)
(A3401 TO A6J2)
COAX CABLE
(ADDED FOR OPTION 00s)
(A6J4 TO FRONT PANEL CH1 LOW)
COAX CABLE
(ADDED FOR OPTION 006)
(A6J3 TO FRONT PANEL CH1 HIGH)
COAX CABLE BNC-PCB
(ADDED FOR OPTION 005)
(A2J12 TO REAR PANEL RESET INPUT)
COAX CABLE BNCPCB
(ADDED FOR OPTION 005)
(AU11 TO REAR PANEL RESET OUTPUT)
COAX CABLE BNC-PCB
(ADDED FOR OPTION 005)
(A2JlO TO SYNC CLOCK IN)
COAX CABLE BNGPCB
(ADDED FOR OPTION 005)
(A2J9 TO SYNC CLOCK OUT)
'Factory
Selected C o m p o n e n t ( R e f e r t o S e c t i o n 5)
A E r r a t a p a r t change
reu.OlNOV89
Replaceable Parts
Model 8904A
Table 63.Replaceable .Parts
Reference
Designation
'".
Code
Mfr. Part Number
Ru\R PANEL SILKSCREEN LABEL
28480
080c440010
1
DECK ASSY
28480
08004-61012
1
1
DECK ASSY
28480
08904-61016
0361-1020
0361-1020
0361-1020
2
2
2
4
RNFTSUND PLSTEM DOME-HD .125DIA
RIVET-BUND PL-STEM DOME-HD .125DIA
RIVET-BUND PLSTEM DOMEHD .125DIA
00201
90201
00201
A
w
m
m2AH
6
7
8
9
10
0361-1020
1252-2245
1252-2245
21904007
21000007
2
5
5
2
2
RNEF-BUND PLSTEM DOMEHD .125DIA
S C W LOCK K I T M P CHAMP C O "
SCREW LOCK W M P CHAMP C O "
WASHERLK INTLT NO. 6.1414N-D
W A S H E W I N n T NO. 6.141-IN-D
00201
00779
11
12
13
14
15
0361-1259
03811259
0590-1251
15104038
21904068
9
9
6
8
5
16
17
18
10
20
0590-1251
21904068
69604132
69604132
69604132
5
1
1
1
21
22
23
24
25
69604132
21904027
29504006
i25i-n88
1251-7788
1
6
3
26
27
28
21904584
21904584
21904068
0
0
30
21904068
6
31*
32
0590-1251
6
33
21904068
6
34
0590-1251
6
35
21904068
6
HPPart
Number
D
1
0890440010
7
1
2712A lo 2u42.4
2
2H8A and a b e
08904-61012
7
2
08904-61014
3
4
5
29A
9
9
Aw2AH
mm
78180
78189
664806-1
664808-1
19064040-2580
19064040-2580
8
RNETBUND D W l N DOMEHD .162DIA
RNET-BUND DRPlN DOMEHD .162DIA
NLJTSPCLY ly3232-THD .l-IN-THK .562-WD
BINDING POST ASSY SGL THDSFUD
WASHERLK INTLT 1/2 IN .5051KID
28480
28480
00000
28480
28480
03614250
0361-1259
ORDER BY DESCRIPTION
15104038
21904068
00000
8
NLJTSPCLY lm232-THD .l-IN-TW .562-WD
W A S H E W INTL T 112 IN .5051N-ID
PLUGHOLE .500D
PLUGHOLE .500D
PLUGHOLE .50OD
ORDER BY DESCRIPTION
21004068
69604132
69604132
69604132
1
1
2
PLUGHOLE .500D
W A S H E U INTLT 114 IN 9561KID
NLJTHEX-DBL-CHAM 11432-THD .094-IN-T%
SCREWLOW FEMALE-AMP HD C O "
SCREWLOCK FEMALE-AMP HD CONN
28480
28480
00779
69604132
21'904027
ORDER BY DESCRIPTION
205818-2
205818-2
W A S H E R U HLCL 3.0 MM 3.1-MM-ID
WASHER-LK HLCL 3.0 MM 3.1-MM-ID
WASHER LK .505-ID
(ADDED FOR OPTION 004)
28480
28480
00000
21004584
21904584
ORDER BY DESCWPTION
00000
ORDER BY DESCRIPTION
2
2
2
1
2
6
2
6
tRefer t o Section 7 f o r u p d a t e information.
rev.01JUL91
Description
Qty.
1
1
NOT ASSIGNED
WASHER LK ,505-ID
(ADDED FOR OPTION 004)
NOT ASSIGNED
NIJTSPCL 1 m 2 32
(ADDED FOR OPTIONS 004 AND 005)
WASHER LK .505-ID
(ADDED FOR OPTION 004)
NLJTSPCL 15/32 32
(ADDED FOR OPTIONS 004 AND 005)
WASHER LK .5051D
(ADDED FOR OPTION 004)
00779
28480
28480
28480
28480
00000
oon9
c
28480
0590-1251
00000
ORDER BY DESCRIPTION
28480
0590-1251
00000
ORDER BY DESCRIPTION
'Factory Selected C o m p o n e n t (Refer to Section 5 )
A E r r a t a p a r t change.
6-19
Replaceable Parts
Model 8904A
a b l e 6-3. Replaceable Parts
Reference
Designation
HP Part
Number
C
D
w.
Description
Mfr-
Code
Mfr. Part Number
2712A to 2917A
t
t
36
37
t
38
SEE SECTION 7 FOR FRONT PANEL RETROFIT KIT
t
39
2923A and abow
36
37
38
39
40
41
42
43
44
45
46
2712A to 2917A
471
2923A and abow
47
48
49
2712A to 291 7A
50
SEE SECTION 7 FOR FRONT PANEL RETROFIT KIT
SEE SECTION 7 FOR FRONT PANEL RETROFIT KIT
t
SEE SECTION 7 FOR FROM PANEL RETROFIT KIT
0890461021
8
1
08904-40006
08904-00021
5
0
1
1
05151851
05151851
0515-1851
05151851
05151851
0515 1851
0515-1851
4
4
4
4
4
4
4
21
05151651
4
PANEL, FRONT AY
NOT SEPARARETLY REPLACEABLE
KEYPAD PUNCHED
SHIELD DISPLAY
SCREW-MACHINE ASSEMBLY M3 X 0.5 6MM-LG
SCREW-MACHINE ASSEMBLY M3 X 0.5 6MM-LG
SCREW-MACHINE ASSEMBLY M3 X 0.5 6MM-LG
SCREW-MACHINE ASSEMBLY M3 X 0.5 6MM-LG
SCREW-MACHINE ASSEMBLY M3 X 0.5 6MM-LG
SCREW-MACHINE ASSEMBLY M3 X 0.5 6MM-LG
SCREW-MACHINE ASSEMBLY M3 X 0.5 6MM-LG
28480
08904-61021
28480
28480
0890640006
28480
28480
28480
05151851
05151851
05151851
05151851
05151851
05151851
05151851
28480
28480
05151851
0515-1851
28480
28480
28480
28480
08904MM21
SEE SECTION 7 FOR FRONT PANEL RETROFIT KIT
NOT ASSIGNED
05151851
05151851
4
4
SCREW-MACHINE ASSEMBLY M3 X 0.5 6MM-LG
SCREW-MACHINE ASSEMBLY M3 X 0.5 6MM-LG
0515-1851
4
SEE SECTION 7 FOR FRONT PANEL RETROFIT KIT
2923A and abow
NOT ASSIGNED
50
51
52
0515-1851
051.51851
SCREW-MACHINE ASSEMBLY M3 X 0.5 6MM-LG
SCREW-MACHINE ASSEMBLY M3 X 0.5 6MM-LG
28480
05151851
0515-1851
53
0590-1251
OMWX)
ORDER BY DESCRIPTION
53
29500035
8
00000
ORDER BY DESCRIPTION
54
0590-1251
6
00000
ORDER BY DESCRIPTION
54
29500035
8
NUT-SPCLY 15/3232-THD .I-IN-THK ,562-WD
(EXCEPT OPTION 006)
NUT-HEX-DBLGHAM15/32-32-THD
(USED FOR OPTION 006)
NUT-SPCLY 15/32-32-THD .l-IN-THK ,562-WD
(EXCEPT OPTION 006)
NUT-HEX-DBLGHAM 15/32-32-THD
(USED FOR OPTION 006)
00000
ORDER BY DESCRIPTION
55
69600132
1
PLUGHOLE .500D
28480
69604132
t R e f e r t o Section 7 for u p d a t e i n f o r m a t i o n .
6-20
28480
*Factory Selected C o m p o n e n t (Refer t o Section 5).
A E r r a t a p a r t change.
rev.01NO V89
Model 8904A
Replaceable Parts
Table 63. Replaceable Parts
Reference
Designation
HPPart
Number
C
D
69604132
1
69
29504035
8
59
29500035
8
60
0590-1251
8
60
29500035
8
61
50014539
e
2
8
4
66
57'5
68A
62
Mfr.
Code
Mfr. Part Number
28480
69604132
00000
ORDER BY DESCRIPTION
00000
ORDER BY DESCRIPTION
00000
ORDER BY DESCRIPTION
00000
ORDER BY DESCRIPTION
FOOT NU-lRMOD (SEE SECTION 7)
FOOT NU-1RMOD (SEE SECTION 7)
FOOT NU-1RMOD (SEE SECTION 7)
FOOT NU-1RMOD (SEE SECTION 7)
TRIM STRIP (SEE SECTION 7)
28480
28480
28480
28480
28480
28480
28480
€4014539
50010539
50418801
50414801
50418801
50414801
LBL BLK SERIAL
28480
5180-1871
28480
28480
28480
28480
0890440016
08904.00017
1460-1345
1460-1345
00000
ORDER BY DESCRIPTION
00000
ORDER BY DESCRIPTION
0.6 8MM-LG
0.6 8MM-LG
0.6 8MM-LQ
0.6 8MM-LG
0.6 8MM-LG
0.6 8MM-LG
0.6 8MM-LG
28480
2UO
28480
28480
28480
28480
28480
05151234
05151234
05151234
05151234
05151234
0515-1234
05151234
SCREW-MACH M3.5 X 0.6 8MM-LG
SCREW-MACH M3.5 X 0.6 8MM-LG
28480
28480
0515-1234
0515-1234
Description
QW.
PLUGHOLE S O D
NOT ASSIGNED
NOT ASSIGNED
NWHM-DBLCHAM l5B232-THD
(USED FOR OPTION 002)
NWHEX-DBLCHAMl5B232-THD
(USED FOR OPTION 006)
NWSPCLY ly32-32-THD.l-IN-THK .562-WD
(USED FOR OPTION 002)
NWHMDBLCHAM 1SD232-THD
(USED FOR OPTION 006)
e
TRIM SIDE FRT F (SEE SECTION 7)
TRlM SIDE FRT F (SEE SECTION 7)
65
68
67
50014539
50414801
50414801
50418801
50418801
50418803
68
5180-1871
2
69
70
71
0890440016
0890440017
1460-1345
1460-1345
3
4
5
5
1
1
2
COVER TOP (SEE SECTION 7)
COVER BOrrOM (SEE SECTION 7)
TILT STAND SST
TILT STAND SST
05150367
5
2
SCREW-MACHINE ASSEMBLY M2.5 X 0.45
05150367
5
63
64
72
2712A to 291 7A
73t
74t
8
8
8
1
0
77
78
79
80
81
2712A to2917A
82
83
2923A and abow
82
NOT ASSIGNED
NOT ASSIGNED
05151234
05151234
05151234
05151234
05151234
05151234
05151234
7
7
7
7
7
7
7
05151234
0515-1234
7
7
10
83
t R e f e r t o Section 7 for u p d a t e i n f o r m a t i o n .
rev. 01JUL91
m KIT
SEE SECTION 7 FOR FRONT PANEL RETROFIT KIT
2923A and a b m
73
74
75
76
SEE SECTION 7 FOR FRONT PANEL m o
SCREW-MACHINE ASSEMBLY M2.5 X 0.45
50414803
SCREW-MACH M3.5 X
SCREW-MACH M3.5 X
SCREW-MACH M3.5 X
SCREW-MACH M3.5 X
SCREW-MACH M3.5 X
SCREW-MACH M3.5 X
SCREW-MACH M3.5 X
NOT ASSIGNED, SEE r E M 145
NOT ASSIGNED
*Factory Selected Component (Refer t o Section 5 )
A E r r a t a p a r t changc.
6-2 1
Replaceable Parts
Reference
Designation
Model 8904A
Table 6-3.Replaceable Parts
HP Part
Number
C
D
84
85
86
87
88
0515 1234
0361-1265
0361-1265
0361-1265
0361-1265
7
7
7
89
90
91
92
93
5021-8415
0515-1860
0515 1860
0515-1860
0515-1860
9
5
5
5
5
94
95
96
97
98
99
100
0515 1860
14000249
14000249
14000249
1W 2 4 9
14000249
14000249
5
0
0
0
0
0
0
1
101
14000249
0
1
102
14W249
0
1
103
104
105
05151851
0515-1851
05151851
4
4
4
106
107
108
109
110
05151851
05151851
05151851
05151851
05151851
4
4
4
4
4
111
112
08904-61013
2190-0585
8
1
1
113
0515-0955
7
1
114
0380-1914
3
7
115
0380-1914
3
116
0380-1914
3
117
0380-1914
3
118
0380-1914
3
119
0380-1914
3
Qty.
4
7
7
1
6
7
1
?Refer to Section 7 for update information
6-22
Mfr.
Code
Description
SCREW-MACH M3.5 X 0.6 8MM-LG
RIVET-BLIND PL-STEM DOME-HD .125DIA
RIVET-BUND PLSTEM DOME-HD .125DIA
RIVET-BLIND PL-STEM DOME-HD ,125DIA
RIVETBLIND PLSTEM DOME-HD 325DIA
FRAME, FRONT
SCREW-MACHINE ASSEMBLY M3.5
SCREW-MACHINE ASSEMBLY M3.5
SCREW-MACHINE ASSEMBLY M3.5
SCREW-MACHINE ASSEMBLY M3.5
28480
0515 1234
AD44H
AD44H
AD44H
AD44H
28480
5021-8415
0515-1860
0515-1860
05151860
0515-1860
90201
90201
90201
90201
X 0.6
X 0.6
X 0.6
X 0.6
28480
SCREW-MACHINE ASSEMBLY M3.5 X 0.6
CABLE TIE .062-.625DIA .091-WD NYL
CABLE TIE .062-.625DIA .091-WD NYL
CABLE TIE .062-.625-DIA ,091-WD NYL
CABLE TIE .062-.625DIA ,091-WD NYL
CABLE TIE .062-.625DIA .091-WD NYL
CABLE TIE .062D .09W
(ADDED FOR OPTION 004)
CABLE TIE .062D .09W
(ADDED FOR OPTION 004)
28480
CABLE TIE .062D .09W
(ADDED FOR OPTION 004)
SCREW-MACHINE ASSEMBLY M3 X 0.5 6MM-LG
SCREW-MACHINE ASSEMBLY M3 X 0.5 6MM-LG
SCREWMACHINE ASSEMBLY M3 X 0.5 6MM-LG
Mfr. Part Number
28480
28480
28480
28480
28480
28480
28480
28480
28480
0515-1 860
14000249
14000249
14000249
14000249
14000249
1400-0249
28480
1400-0249
28480
14004249
28480
0515-1 851
05151851
0515-1851
28480
28480
SCREWMACHINE ASSEMBLY M3 X 0.5 6MM-LG
SCREW-MACHINE ASSEMBLY M3 X 0.5 6MM-LG
SCREW-MACHINE ASSEMBLY M3 X 0.5 6MM-LG
SCREW-MACHINE ASSEMBLY M3 X 0.5 6MWLG
SCREW-MACHINE ASSEMBLY M3 X 0.5 6MM-LG
28480
28480
28480
AY-SHLD OUT PUT
WASHER-LK HLCL 3.5 MM 3.6-MM-ID
(ADDED FOR OPTION 002)
SCREW-MACH M3.5 X 0.6 30MM-LG PAN-HD
(ADDED FOR OPTION 002)
28480
08904-61 013
2190-0585
28480
0515-0955
SPACER-RND 19-MM-LG 5.6-MM-ID 10-MM-OD
(ADDED FOR OPTION 002)
SPACER-RND 19-MM-LG 5.6-MM-ID 10-MM-OD
(ADDED FOR OPTION 002)
SPACER-RND 19-MM-LG 5.6-MM-ID 10-MM-OD
(ADDED FOR OPTION 002)
06540
19666N0056
06540
1966GN0056
06540
19666N0056
SPACER-RND 19-MM-LG 5.6-MM-ID 10-MM-OD
(ADDED FOR OPTION 002)
SPACER-RND 19-MM-LG 5.6-MM-ID 10-MM-OD
(ADDED FOR OPTION 002)
SPACER-RND 19-MM-LG 5.6-MM-ID 10-MM-OD
(ADDED FOR OPTION 002)
06540
19666-NW56
06540
19666-NW56
06540
19666-NO056
28460
28480
28480
'Factory Selected Component (Refer t o Section 5 ) .
0515-1851
05151851
05151851
05151851
05151851
A E r r a t a part change.
reu.OlNOV89
Replaceable Parts
Model 8904A
Table 6-3. Replaceable Parts
Reference
Designation
Description
Number
HPPart
120
0380-1914
3
121
0380-1929
0
1
122
14004249
0
1
123
124
7120-4295
14000249
6
0
1
1
125
1400-0249
0
1
126
1400-0249
0
1
127
1400-0249
0
1
128
129
1400-0249
1400-0249
0
0
1
130
08904-61013
8
1
131
0515-1851
4
1
132
05151851
4
1
133
0515-1851
4
1
134
05151851
4
1
135
0515-1851
4
1
136
0515-1851
4
1
137
0515-1851
4
1
138
0515-1851
4
1
27I2A to 2817A
08904-00015
2
1
t R e f e r t o Section 7 for u p d a t e information.
reu.OlNOV89
Mfr. Part Number
SPACER-RND 19-MM-LG 5.6MM-ID 1OMM-OD
(ADDED FOR OPTION 002)
SPACER-RND 19-MM-LG CMM-ID 3.5MM-THO
(ADDED FOR OPTION 002)
CABLE TIE .062D.O9W
(ADDED FOR OPTION 004)
06540
19666NOO56
06540
19616-BoO4O-28
28480
14000249
LABEL-WARNING 1-IN-WD 2-IN-LG AL
CABLE TIE .062D .09W
(ADDED FOR OPTION 004)
CABLETIE .062D .09W
(ADDED FOR OPTION 004)
CABLE TIE .062D .09W
(ADDED FOR OPTION 004)
28480
28480
7120-4295
1400-0249
28480
14000249
28480
14004249
CABLE TIE .062D .09W
(ADDED FOR OPTION 004)
CABLE TIE .062-.626DIA ,091-WD NYL
CABLE TIE .062D .09W
(ADDED FOR OPTION 002)
28480
14004249
28480
28480
14000249
14000249
OUTPUT ASSEMBLY SHIELD
(ADDED FOR OPTION 002)
SCREW 3.0 6 SEM PNTX
(ADDED FOR OPTION 002)
SCREW 3.0 6 SEM PNTX
(ADDED FOR OPTION 002)
28480
0890441013
00000
ORDER BY DESCRIPTION
00000
ORDER BY DESCRIPTION
00000
ORDER BY DESCRIPTION
00000
ORDER BY DESCRIPTION
00000
ORDER BY DESCRIPTION
00000
ORDER BY DESCRIPTION
00000
ORDER BY DESCRIPTION
00000
ORDER BY DESCRIPTION
00000
ORDER BY DESCRIPTION
SCREW 3.0 6 SEM PNTX
(ADDED FOR OPTION 002)
SCREW 3.0 6 SEM PNTX
(ADDED FOR OPTION 002)
SCREW 3.0 6 SEM PNTX
(ADDED FOR OPTION 002)
SCREW 3.0 6 SEM PNTX
(ADDED FOR OPTION 002)
SCREW 3.0 6 SEM PNTX
(ADDED FOR OPTION 002)
SCREW 3.0 6 SEM PNTX
(ADDED FOR OPTION 002)
NOT ASSIGNED
I39
2822A and ubooe
139
Mfr.
Code
INSULATOR. EPOXY GLASS
* F a c t o r y Selected C o m p o n e n t ( R e f e r t o Section 5)
A E r r a t a p a r t change.
6-22.1
Model 8904A
Replaceable Parts
lbble 6-3. Replaceable Parts
Reference
Designation
HPPart
Number
E
2712A to 291 7A
I40
141
2923A and above
I40
I41
2912A to 291 7A
142-145
2923A and aboue
142
143A
144A
145
2912A to 2942A
146-148
2948A and above
146
147
148
149
2912A to 2942A
150-166
2948A and above
150
151
Mfr. Part Number
NOT SEPARATELY REPLACEABLE
NOT SEPARATELY REPLACEABLE
NOT ASSIGNED
0890600022
05152028
05150954
0515-1234
1
6
6
7
1
2
2
9
LINE SWITCH BRACKET
SCREW-MACH M2.5 X 0.45 4MMLG
SCREW-MACH M2.5 X 0.45 4MMLG
SCREW-MACH M3.5 X 0.6 8MM-LG
28480
28480
08904-00022
05150954
05150954
05151234
00000
00000
00000
ORDER BY DESCRIPTION
ORDER BY DESCRIPTION
ORDER BY DESCRIPTION
28480
00000
089Od80015
ORDER BY DESCRIPTION
00000
ORDER BY DESCRIPTION
28480
0515-1 8M)
28480
0515 1860
28480
05151860
28480
05151860
28480
1400.0249
28480
1400.0249
28480
1400-0249
28480
1400.0249
28480
1400.0249
28480
08900-80017
28480
1400.0249
28480
08904-00012
28480
28480
NOT ASSIGNED
30500891
3050-0891
30500891
7
7
7
3
3
3
WASHER-FL MTLC 3.OMM 3.3MM-ID
WASHER-FL MTLC 3.OMM 3.3MM-ID
WASHER-FL MTLC 3.OMM 3.3MM-ID
NOT ASSIGNED
NOT ASSIGNED
0
4
1
1
I52
05151851
4
1
153
05151860
5
154
0515-1860
5
155
05151860
5
156
0515-1860
5
157
14000249
0
1
I58
14000249
0
1
159
1400249
0
1
160
14000249
0
1
I61
14000249
0
1
I62
0890680017
2
1
164
165
14000249
0
1
166
08904-00012
9
1
tRefer to Section 7 for update information.
6-22.2
Mfrm
Code
NOT ASSIGNED
NOT ASSIGNED
08904-80015
05151851
I63
Description
sty.
LABEL FOR OPTION 006
SCREW 3.0 6 SEM PNTX
(ADDED FOR OPTION 006)
SCREW 3.0 6 SEM PNTX
(ADDED FOR OPTION 006)
SCREW-MACHINEASSEMBLY M3.5 X 0.6
(ADDED FOR OPTION 006)
SCREW-MACHINE ASSEMBLY M3.5 X 0.6
(ADDED FOR OPTION 006)
SCREW-MACHINE ASSEMBLY M3.5 X 0.6
(ADDED FOR OPTION 006)
SCREW-MACHINE ASSEMBLY M3.5 X 0.6
(ADDED FOR OPTION 006)
CABLE TIE .OED .WW
(ADDED FOR OPTION 005)
CABLE TIE .062D .WW
(ADDED FOR OPTION 005)
CABLE TIE .062D .WW
(ADDED FOR OPTION 005)
CABLE TIE .062D .09W
(ADDED FOR OPTION 005)
CABLE TIE .062D .WW
(ADDED FOR OPTION 005)
LABEL FOR OPTION 005
NOT ASSIGNED
NOT SEPARATELY REPLACEABLE
CABLE TIE .062D .WW
(ADDED FOR OPTION 006)
BOARD PULLER
*Factory Selected Component (Refer t o Section 5 )
A Errata part change.
reu.OlNOV89
I'ZZ-9
68AON 1O'naJ
Replaceable Parts
Model 8904A
.'
L
Figure 6-1. Main Deck Assembly
6-22.4
-
Top, (2923A and above)
rev.01NOV89
Model 8904A
Replaceable Parts
Figure 6-1. Main Deck Assembly - Top, Option 005 (2948A and above)
rev.30NOV89
6-23
Replaceable Parts
Model 8904A
Figure 6-2. Main Deck Assembly
6-24
-
Bottom
reu.3ONOV89
Model 8904A
Replaceable Parts
Figure 6-2. Main Deck Assembly - Bottom, Option 006 (2948A and above)
rev.30NOV89
6-24.1
Model 8904A
Replaceable Parts
/;
0
W
W
W
wl
Figure 6-3. Front Panel Assembly, (2712A to 291 7A), See Section 7 for Front Panel Retrofit Kit.
6-24.2
reu.30NOV89
Replaceable Parts
Model 8904A
Figure 6-3. Front Panel Assembly, (2923A and above)
reu.30NOV89
6-24.3
Model 8904A
Replaceable Parts
Figure 6-3. Rent Panel Assembly, Option 006 (2948A and above)
reu.30NOV89
6-25
Replaceable Parts
Model 8904A
Figure 6-4. Rear Panel Assembly
6-26
rev.30NO V89
Model 8904A
Replaceable Parts
Figure 6-4. Rear Panel Assembly, Option 005 (2948A and above)
rev.30N0 V89
6-26.1
Replaceable Parts
Model 8904A
Figure 6-5. Covers, Labels, and ROMs
rev.ZSSEP88
6-27
Replaceable Parts
Model 8904A
Figure 6-6. Output Cables (1 of 2)
6-28
reu.30NOV89
Model 8904A
Replaceable Parts
Q
Figure 6-6. Output Cables, Option 005 (29484 and above) (2 of 2)
rev.30N0 V89
6-29
HP8904A
Table of Contents
TABLE OF CONTENTS
Section 7
Instrument Changes
Introduction to This Section . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Option Conversions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Instrument Modifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Front-To-Rear-Panel Output Conversion . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Parts Required . . . . . . : . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Tools Required . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Modification Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Operation Verification . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Rear-To-Front-Panel Output Conversion . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Parts Required . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Tools Required . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Modification Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Operation Verification . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Firmware Updates (A2U12 and A2U13) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Modification For Possible Ground Wire Shock Hazard . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Modification For Output Overvoltage Protection Improvement . . . . . . . . . . . . . . . . . . . . . . . .
Modification For Potential Power Supply Short . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Cabinet Parts Color Change . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Modification For Front Panel Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
7.1
7.1
7.2
7-3
7.3
7.3
7.3
7.3
7-4
7-5
7.5
7.5
7.5
7.5
7.6
7.9
7-10
7-13
7-14
7-14
7-15
Model 8904A
Instrument Changes
Section 7
INSTRUMENT CHANGES
7-1. INTRODUCTION TO THIS SECTION
This section contains instrument modification recommendations and procedures that could improve
the performance and reliability of your instrument. Refer to Instruments Covered by This Manual in
section 1 of the H P 8904A Operation and Calibration Manual for important information about serial
number coverage.
7-2. OPTION CONVERSIONS
It is sometimes desirable to add or delete options in the instrument after the initial purchase. In the
HP 8904A Multifunction Synthesizer this can be done as indicated in the following table.
Number
I
2942A and below
294814 and above
Yes
Yes
Yes
Yes
Yes
No
No
Yes
Yes
Yes
Yes, except in combination with Option 005 or 006
Yes
Yes, except in combination with Option 004
Yes, except in combination with Option 004
001
002
003
004
Delete 004
005
006
To retrofit Option 001 (three internal channels, channel A modulation, summation, and sequence
capability), order HP 11816A from your local Hewlett-Packard Sales office.
To retrofit Option 002 (second internal synthesizer and output), order HP 11817A from your local
Hewlett-Packard Sales office.
To retrofit Option 003 (fast hop and digital modulation capability), order HP 11818A from your local
Hewlett-Packard Sales office.
To retrofit Option 004 (front-panel connectors moved to rear panel), follow the instructions in section
titled Front-to-Rear-Panel Output Conversion. This option cannot be added in combination with Option
005 (multi-instrument phase synchronization) or 006 (balance output).
To delete Option 004 (rear-panel connectors moved to front panel), follow the instructions in the
section titled Rear-to-Ront-Panel Output Conversion.
To retrofit Option 005 (multi-instrument phase synchronization), order HP 11827A from your local
Hewlett-Packard Sales office. Only instruments with serial prefix 2948A and above can be retrofit
with this option. If the instrument has Option 004 (front-panel connectors moved t o rear panel), the
rear-panel connectors will need to be moved to the front panel.
rev.15DEC89
7- 1
Instrument Changes
Model 8904A
To retrofit Option 006 (balance output), order H P 11837A from your local Hewlett-Packard Sales
office. Only instruments with serial prefix 2948A and above can be retrofit with this option. The
added balanced output will replace one of the outputs already in the instrument if it has Option 002
(second internal synthesizer and output). If the instrument has Option 004 (front-panel connectors
moved to rear panel), the rear-panel connectors will need to be moved to the front panel.
7-3. INSTRUMENT MODIFICATIONS
Instrument modifications include firmware updates and hardware modifications. For information on
firmware updates refer to the following table and to the section titled Firmware Updates.
~
Serial Prefix
~
~~
2732A and below
Firmware History
Revision Code
20987A
and
22987A
~~
The first two editions of firmware had several problems and were incomplete,
though useable. It is recommended that all instruments be upgraded to
Revision 22987A with HP 08904-87010 as A2U12*.
2737A to 2942A
22987A
Problems noted in the previous firmware revision were fixed. However, the
following problem has been noted: When used with HP-IB controllers which
process HP-IB commands very fast, the instrument may hang up the HP-IB
when the instrument is a talker. This problem can be corrected by upgrading
to Revision 22987A with HP 08904-87010 as A2U12'.
2948A and above
27887A
Problems noted in the previous firmware revisions were fixed. Programs for
operating Options 005 and 006 were added. Two enhancements were added
to Option 001: Hop RAM sequencing and FM stereo. A physical re-design
of the controller was made which does not permit this added firmware to be
retrofitted into older instruments.
'Two revisions of firmware share the same revision code: 22987A. The older revision has part number HP 08904-87007 for ROM A2U12;
the newer revision has part number HP 08904-87010.
For information on recommended hardware modifications refer to the followingtable and to the section
titled Hardware Modifications.
Nature of Modification
Serial Prefix
2737A
2747A
281 7A
2917A
7-2
and below
and below
and below
and below
Modification for
Modification for
Modification for
Modification for
possible ground wire shock hazard.
output overvoltage protection improvement.
potential power supply short.
front panel assembly.
rev.15DEC89
Model 8904A
Instrument Changes
7-4. FRONT-TO-REAR-PANEL OUTPUT CONVERSION
Description
This procedure describes how to convert an instrument with front-panel output connectors (that is, a
standard instrument) to one with rear-panel connectors (that is, Option 004). The procedure applies
to instruments with one pair of outputs or two (that is, Option 002).
The modifications requires partial disassembly of the instrument (removing covers and routing of
cables). No soldering is required. Modification should be done in a static protected environment. After
modification, two performance tests must be run.
Parts Required
The following parts are required and may be ordered by contacting the nearest Hewlett-Packard Sales
Office.
Table 7-1. Parts for HP 8904A Rant-to-Rear-Panel Output Conversion
Option
I
Quantity
Standard
Option 002
Standard
Option 002
Description
Plastic Hole-Plug
Plastic Hole-Plug
Lock Washer 0.505 inch ID
Lock Washer 0.505 inch ID
Cable Tie
Label Blank
HP Part Number
6960-0132
6960-0132
21 90-0068
21 90-0068
1400-0249
51 80-1871
Tools Required
The following tools are needed to modify the instrument:
9/16 inch, 6 point Nut Driver
No. 2 Pozidriv Screwdriver
Diagonal Cutters
Needle-nose Pliers
Modification Procedure
Removing Bottom Cover
1. Turn the instrument off and unplug the power cord.
2. Lay the instrument on its top and unscrew the Pozidriv screw in the middle of the rear edge of
the bottom cover. This is a captive screw and will cause the bottom cover to push away from the
frame. Slide the cover back about 6.5 mm (0.25 inch) and lift it off.
Preparing the Chassis
1. Remove the nuts from the present front-panel outputs with the 9/16 inch nut driver. Do not
press against the front panel with the tool or scoring of the panel may occur.
2. Remove the cable tie around the loop of slack coaxial cable in the instrument by cutting it with
the diagonal cutters being careful not to score the soft insulation on the cables.
3. Remove the necessary plastic hole-plugs in the rear panel by approaching them from inside the
chassis with the needle-nose pliers and squeezing-in the small holding tangs on opposite sides
of the plug. Grasp the front of the plug with your fingers to pull it away from the panel. Do not
attempt to pry the plug out from the panel or the panel surface may get scarred.
rev.15DEC89
Front-to-Rear-Panel Output Conversion
7-3
Instrument Changes
Model 8904A
Cable Routing
1. Refer to figures 7-1, 7-2 and 7-3. Remove the BNC connector ends from the front panel one at
a time and insert them into the corresponding openings in the rear panel.
2. After all of the connectors have been transferred to the rear panel, secure the cables to the side
rail as shown in figure 7-3 using the new cable ties.
3. Install one new lock washer and one new nut on each connector.
4. Tighten the nuts on the BNC connectors hand tight using the nut driver. (The holes in the panel
are D shaped and therefore prevent the connector from turning without having to tighten the
nuts excessively.)
5. Verify that the SMC connections on the A3 Output Assembly and, if the instrument has
Option 002, the A10 Output Assembly are tight.
Final Steps
1. Insert the new plastic hole-plugs into the front-panel output openings by carefully working the
plugs into the holes with your fingers. The plugs fit tightly and will require some pressure to get
them started in the holes.
2. Replace the bottom cover by reversing the removal procedure.
3. Type or write the date and option number on the new blank label in the following form:
day/month/year : Opt . 004. Peel off the protective backing and stick the label on the rear
panel. (Do not place the label over the existing serial number tag.)
Operation Verification
1. Connect the power cord and turn the instrument on.
2 . The instrument should beep immediately upon power up and then again about 4.5 seconds later.
The display should read
I*
HP 8904A Main S e l e c t i o n Level
f l Channel Confie.
*I
3. Key in the following keys. (This will set up 5 V dc on the OUTPUTS 1 HIGH connector and
ground the LOW connector.)
fl (Channel Conf ig. )
NEXT
SHIFT FLOAT 1 OFF
WAVE FORM
AMPTD 5 V
=
4. Connect a DC voltmeter, set to measure a 5 V dc signal, to the OUTPUTS 1 HIGH connector.
The voltmeter should read approximately 5 V dc.
5. If the instrument is equipped with a second output, Option 002, key in
NEXT
SHIFT FLOAT 2 OFF
WAVE FORM 5=1
AMPTD 5 V
6. Connect the DC voltmeter to the OUTPUTS 2 HIGH connector. The voltmeter should read
approximately 5 V dc.
7. Perform the AC and DC Amplitude Accuracy Test and the AC Amplitude Flatness Test. (Refer +.,
the H P 8904A Operation and Calibration Manual.)
7-4
Front-to-Rear-Panel Output Conversion
rev.15DEC89
Model 8904A
Instrument Changes
7-5. REAR-TO-FRONT-PANEL OUTPUT CONVERSION
Description
This procedure describes how to convert a n instrument with rear-panel output connectors (that is,
Option 004) to one with front-panel connectors (that is, a standard instrument). The procedure applies
to instruments with one pair of outputs or two (that is, Option 002).
The modifications requires partial disassembly bf the instrument (removing covers and routing of
cables). No soldering is required. Modification should be done in a static protected environment. After
modification, two performance tests must be run.
Parts Required
The following parts are required and may be ordered by contacting the nearest Hewlett-Packard Sales
Oflice.
Option
Standard
Option 002
Quantity
2
4
3
Description
Plastic Hole-Plug
Plastic Hole-Plug
Cable Tie
HP Part Number
6960-0132
6960-0132
1400-0249
Tools Required
The following tools are needed to modify the instrument:
9/16 inch, 6 point Nut Driver
No. 2 Pozidriv Screwdriver
Diagonal Cutters
Needle-nose Pliers
Modification Procedure
Removing Bottom Cover
1. Turn the instrument off and unplug the power cord.
2. Lay the instrument on its top and unscrew the Pozidriv screw in the middle of the rear edge of
the bottom cover. This is a captive screw and will cause the bottom cover to push away from the
frame. Slide the cover back about 6.5 mm (0.25 inch) and lift it off.
Preparing the Chassis
1. Remove the nuts from the present rear-panel outputs with the 9/16 inch nut driver. Do not press
against the rear panel with the tool or scoring of the panel may occur.
2. Remove the cable ties that secure the coaxial output cables to the sideframe by cutting them
with diagonal cutters being careful not to score the soft insulation on the cables.
3. Remove the necessary plastic hole-plugs in the front panel by approaching them from inside the
chassis with the needle-nose pliers and squeezing-in the small holding tangs on opposite sides
of the plug. Grasp the front of the plug with your fingers to pull it away from the panel. Do not
attempt to pry the plug out from the panel or the panel surface may get scarred.
rev.15DEC89
Rear-to-F'ront-Panel Output Conversion
7-5
Instrument Changes
Model 8904A
Cable Routing
1. Refer to figures 7-1, 7-2 and 7-3. Remove the BNC connector ends from the rear panel one a t
a time and insert them into the corresponding openings in the front panel.
2. After all of the connectors have been transferred to the front panel, loop the cables and secure
them to the front of the deck using the new cable ties as shown in figure 7-3.
3. Install one nut on each connector.
4. Tighten the nuts on the BNC connectors hand tight using the nut driver. (The holes in the panel
are D shaped and therefore prevent the connector from turning without having to tighten the
nuts excessively.)
5. Verify that the SMC connections on the A3 Output Assembly and, if the instrument has
Option 002, the A10 Output Assembly are tight.
Final Steps
1. Insert the new plastic hole-plugs into the rear-panel output openings by carefully working the
plugs into the holes with your fingers. The plugs fit tightly and will require some pressure to get
them started in the holes.
2. Replace the bottom cover by reversing the removal procedure.
3. Remove the Option 004 label from the rear panel.
Operation Verification
1. Connect the power cord and turn the instrument on.
2. T h e instrument should beep immediately upon power up and then again about 4.5 seconds later.
T h e display should read
* HP 8904A Main Selection Level
f l Channel Config.
~~
*
3. Key in the following keys. (This will set up 5 V dc on the OUTPUTS 1 HIGH connector and
ground the LOW connector.)
fl (Channel Config.
NEXT
SHIFT FLOAT 1 OFF
WAVE FORM r
AMPTD 5 V
4. Connect a DC voltmeter, set to measure a 5 V dc signal, to the OUTPUTS 1 HIGH connector.
T h e voltmeter should read approximately 5 V dc.
5. If the instrument is equipped with a second output, Option 002, key in
NEXT
SHIFT FLOAT 2 OFF
WAVE FORM
AMPTD 5 V
=
6. Connect the DC voltmeter to the OUTPUTS 2 HIGH connector. The voltmeter should read
approximately 5 V dc.
7. Perform the AC and DC Amplitude Accuracy Test and the AC Amplitude Flatness Test. (Refer to
the HP 8904A Operation and Calibration Manual.)
7-6
Rear-to-Front-Panel Output Conversion
reu.15DEC89
Instrument Changes
Model 8904A
Figure 7 - 1 . R o n t Panel Output Hardware
\
h
Figure 7-2. Rear Panel Output Hardware
rev.lSDEC89
7-7
Instrument Changes
Model 8904A
w5
Figure 7-3. Output Cable Routing (ALL Options)
7 -8
rev.15DEC89
Model 89048
Instrument Changes
7-6. FIRMWARE UPDATES (A2U12 AND A2U13)
The -ware
is changed whenever anomalies are found in the instrument’s operation which can be
corrected by altering the Controller’s program. Firmware is also changed to add new features, which
may only be changes in the program, or which may also result from instrument hardware changes.
Replacing the ROMs
Use the following procedure to install new ROMs:
The ROMs ( M U 1 2 and MU131 are static sensitive devices. Takeprecautions against electrostatic discharge @SD) before handling these components.
NOTE
In instruments with serial prefix 2942A and below, the f i n w a r e is stored
in two ROMs ( M U 1 2 andA2U13). In instruments with serialprefix2948A
and above, the firmware i
sstored only in one ROM (MU12). (MU13 serves
a different function)
1. Unplug the power cord.
2. Remove the top cover. The cover may be tightly secured in the groove of the bottom cover. If
the top cover does not pull off easily after backing out the screw on the rear edge, back out the
screw on the rear edge of the bottom cover also.
3. For instruments with serialprefix 29428 and below, inlocate U12 and U13 onthe A2 assembly
(front horizontal board). For instruments with serial prefix 2948A and above, locate only U12.
They are in sockets. The reference designator is labeled beside the IC.
4. Pry out the old ROM or R O W with a blade-type screwdriver.
5. Plug in the new ROM or ROMs in the correct sockets and with the correct pin orientation.
6. Check the operation of the instrument.
Serial Prefix 2740A and below:
The recommended replacement for M U 1 2 is H P Part 08904-87010. The recommended replacement
for M U 1 3 is HP Part 08904-87008. Ifeither M U 1 2 or M U 1 3 fails, replace the other part also if its
part number differs.
Serial Prefix 2742A and above:
The recommended replacement for M U 1 2 is HP Part 08904-87011.The recommended replacement
for M U 1 3 is HP Part 08904-87009.
rev. 01JUL91
Firmware UpdatesBardware Modifications
7-9
Model 8904A
Instrument Changes
7-7. MODIFICATION FOR POSSIBLE GROUND WIRE SHOCK HAZARD
(Serial Prefix 2737A and below)
O n some instruments with serial prefix 2737A and below, the grounding
wire from the rear-panel line socket to the metal chassis may not have
been wrapped and soldered in compliance with strict safety standards. This
condition does not create a safety hazard under normal use; however, a safety
hazard can develop if the following two conditions occur.
(1) If the ground wire ever sustains heavy current long enough, the solder on
the connections can erode, weaken, and eventually cause the connections to
loosen. Should ground contact break, the chassis can no longer be guaranteed
to be at ground potential.
(2) W i t h ground contact interrupted, the chassis could become “hot” if the
neutral or high lines of the power cord come in contact with the chassis
through some other fault. The chassis then becomes a shock hazard.
With proper wrapping and soldering of the ground connections, the ground
wire will maintain a reasonable mechanical connection even though the solder
has deteriorated.
This information explains how to check for the possible shock hazard and how to correct it. The check
for the shock hazard is by simple visual inspection. Corrective action, if needed, consists of replacing
the ground wire with attention paid to wrapping and soldering it to its solder lugs. Replacement of
the wire should be made by someone with wire soldering skills.
The following parts may be required
1
Description
Cable Tie
Wire (Green/Yellow)
7-10
Firmware Updates/Hardware Modifications
I
Quantity
1
HPPart Number
I
0360-0036
1400-0249
8150-2919
rev. 15DEC89
Model 8904A
Instrument Changes
Checking for the Shock Hazard
1. Unplug the power cord from its rear-panel socket.
2. Remove the instrument’s top cover by backing out the screw in the center of the rear edge of the
cover. This is a captive screw and will cause the cover to push away from the frame.
3. Refer to figure 7-4. Locate the ground wire. It has green insulation with a yellow stripe and
is inside the rear panel in the right rear corner of the instrument beneath the red and silver
warning label.
4. Carefully slit the black shrink tubing over the ground wire connection to the line socket. A sharp
X-acto knife is recommended. (The shrink tubing will not be replaced.)
5 . Inspect the soldered wire connection on both ends of the ground wire and compare the wire
wrapping to figure 7-5. One end of the wire goes to the chassis ground lug and the other end to
the socket ground connection on the rear-panel line socket.
6. If the solder joints are properly wrapped and soldered, replace the top cover and make a quick
check of the operation of the instrument.
\
/-WARNING
LABEL
BLACK WIRE
GREENVELLOW GROUND WIRE
’ /\
MAIN HARNESS (GRAY)
Figure 7-4. Parts Location (Shown with Power Supply Removed)
rev. 15DEC89
Firmware Updates/Hardware Modifications
7-11
Instrument Changes
Model 8904A
GOOD WRAPPING
Wire is mechanically secure prior to
soldering. The wire wrap is at least
three quarters to one full turn.
POOR WRAPPING
(1) Wire is not mechanically secure prior
to soldering.
(2) Wrap is less than three quarters turn.
(3) Wrap exceeds one full turn.
~~
~
~~
________~
Figure 7-5. Ground Wire Wrapping
Replacing the Ground Wire
1. If the wrap on either end of the ground wire is not within specification, the ground wire must
be replaced.
2. Remove the screw holding the ground wire to the instrument standoff. (Use a T10 or T15 Torx
screwdriver as needed.)
3. Cut the gray cable tie which secures the main wire harness to the standoff with a pair of diagonal
wire cutters. Avoid cutting into the insulating sheath of the harness.
4. With the main harness free, move it up and t o the left so as not to interfere with soldering.
5. Heat the soldering iron. You will also need a roll of solder wick.
6. On the line cord socket, heat the solder on the lug where the ground wire is attached and apply
the solder wick. At the same time move the ground wire around and pull the ground wire out of
the lug. Avoid touching any of the loose wires with the soldering iron.
7. Cut an 8 cm (3.2 inch) length of new 18 gauge ground wire (HP 8150-2919). Strip 8 mm (5/16
inch) of insulation from each end of the wire.
8. Wrap and solder one end of the stripped ground wire onto a new solder lug (HP 0360-0036).
Refer to figure 7-5 for wrapping details.
9. Insert the other end of the new ground wire into the empty lug on the line cord socket. After the
wire is properly wrapped, solder it in place.
7-12
Firmware Updates/Hardware Modifications
rev. 15DEC89
Model 8904A
Instrument Changes
NOTE
It is possible that the 22 gauge black wire may break while replacing the new
ground wire. If it does, strip 8 mm (5116 inch) of insulation from it and
properly wrap and solder it to a second new lug.
10. Replace the screw in the standoff, inserting the screw through the lug with the black wire first
and then through the lug with the new ground wire. Tighten the screw.
11. Put the main wiring harness next to the standoff and secure both together with a gray cable tie
(HP 1400-0249). Cut off the excess tie wrap lead. Make sure the box on the tie wrap is toward
the inside of the instrument.
12. Replace the top cover and make a quick check of the operation of the instrument.
7-8. MODIFICATION FOR OUTPUT OVERVOLTAGE PROTECTION IMPROVEMENT
(Serial Prefix 2747A and below)
The output overvoltage protection circuit of the H P 8904A Multifunction Synthesizer has a potential
problem. On instruments with serial prefix 2747A and below, excessive leakage in four clamp diodes
(A3CR415 to A3CR418) shifts the trip point of the circuit to a voltage too high to protect the output
against inadvertent application of high reverse voltage.
No failures due to this problem have been observed, but all instruments with serial prefix 2747A and
below should be modified.
Modify the instruments as directed below. (Refer to Service Sheet SS4 for schematic and component
locator.)
1. Order the parts listed in the table below.
2. Replace diodes A3CR15 through A3CR18 with part number 1901-0880.
3. Replace A3R494 and A3R95 (1780s1) with part number 0698-0085 (26100).
4. Replace A3R491 and A3R493 (34.8 kR) with part number 0757-0199 (21.5 k0).
5. If the instrument has Option 002, a second output, the same modification should be made to the
A10 assembly.
I
I
rev. 15DEC89
HPPartNumber
~~
0698-0085
0757-0199
1901-0880
* If
1
Parts List
CD
0
3
7
I
Qty*
2
2
4
I
Description
Fixed Resistor, 261OR
Fixed Resistor, 21.5 kR
Diode
the instrument has Opt 002, order twice this quantity.
I
I
Firmware Updates/Hardware Modifications
7-13
Instrument Changes
Model 8904A
7-9. MODIFICATION FOR POTENTIAL POWER SUPPLY SHORT
(Serial Prefix 2817A and below)
A problem has been noted in H P 8904A Multifunction Synthesizers with Option 002 (a second output)
and with serial prefix 2817A and below. In these instruments it is possible for the heatsinks on the
output transistors on the A10 Output Assembly (installed only in Option 002) to touch the bottom
cover when the instrument is jarred. If the instrument is jarred often enough, the anodization (an
insulator) on the heatsinks will wear through and could make electrical contact with the cover. Should
this occur while the instrument is on, a 16 V power supply may short to ground. This may cause the
power supply fuse to blow or it may intermittently cause the following error to be displayed
!!
Reference Loop Reports Out O f Lock ! !
To prevent or solve this problem, it is recommended that an insulator (HP part 08904-00015) be
installed on the inside of the bottom cover. The insulator has a peal-off adhesive backing. Place it just
behind the front perforations. It should cover any scuff marks left by the heatsinks.
7-10. CABINET PARTS COLOR CHANGE
(Serial Prefix 2914A and above)
NOTE
Serial prefix 2914A changes the color of the instrument covers and accessories.
The old color cover and accessories are no longer available. If your instrument
has serial prefixes 2913A and below, and you must replace one of these parts,
we recommend that you order the full set of covers and accessories. Affected
cabinet parts are items 61-67, and items 69-70 (see table 6-3).
7-14
Firmware Updates/Hardware Modifications
rev.15DEC89
Model 8904A
Instrument Changes
7-1 1. MODIFICATION FOR FRONT PANEL ASSEMBLY
(Serial Prefix 2712A to 2917A)
INTRODUCTION
HP part number 08904-61023 contains the parts to replace the front panel in HP 8904A Multifunction
Synthesizers with serial prefix 2917A or below. The front-panel keys in these instruments may have
a tendency to intermittently stay down when pressed. This problem cannot usually be cured by
mechanical adjustment of front-panel parts or by replacement of individual parts.
The kit is easy to install and requires no special tools. The contents of the kit are listed in table 7-3.
The A5 LCD Display is not included in the kit and must be transferred from the old front-panel
assembly.
Table 7-3.Parts List for H P 08904-61023 Bont-Panel Kit
Qty
1
11
2
3
4
1
1
1
1
1
Description
HPPartNumber
Keycap
Screw, 3 . 0 ~ 6mm, Panhead, Torx,
with Captive Lockwasher
Screw, 25x4 mm, Flathead, Pozidriv
Flatwasher, 3 mm ID
Hole Plug, 0.5 inch Diameter
Display Shield
Line Switch Bracket
Keypad
Keyboard Assembly (Al)
Front Panel Assembly
1
CD
0371-3802
0515-1851
3
4
0515-2028
3050-0891
6960-0132
08904-00021
08904-00022
08904-40006
08904-60201
08904-61021
9
7
1
4
1
5
4
8
INSTALLATION PROCEDURE
Removing Covers
Use standard electrostatic discharge (ESD)precautions when working around
electrostatic-sensitive components such as on the display and digital assemblies.
NOTE
Refer to the figures in Section 6 of the H P 89044 Service Manual and
figure 7-6 in this installation note for part identification and location.
1. Turn the instrument off and unplug the power cord.
2. Remove the top and bottom covers by unscrewing the screw in the middle of the rear edge of the
covers. This is a captive screw and will cause the cover to push away from the frame.
reu.15DEC89
Firmware UpdatesIHardware Modifications
7-15
Instrument Changes
Model 8904A
Removing the Front Panel
3. Unplug the two connectors on the top front edge of the A2 Digital Assembly that are attached
to the A5 LCD Display. (Refer to figure 6-3. The two cables are labeled as P/O A5.)
4. Remove the top trim strip (item 67 in figure 6-5) and two side strips (items 61 and 62) from the
front-panel frame.
5. Remove the 10 screws (items 75 through 84 in figure 6-1, 2712A to 2917A) that secure the
front-panel assembly to the front frame (item 89).
6. Pull the front panel part way out until it is easy to access AlW1. (Refer to figure 6-1. A l W l is
the remaining wide ribbon cable a t the front of the A2 Digital Assembly.) Unplug the cable from
the A2 assembly.
7. Pull the front panel further out to reveal the two T-8 Torx screws with lockwashers (items 73
and 74 in figure 6-1) securing the line switch to the bottom of the front panel then remove the
two screws. (The screws will not be reused.)
8. Remove the front-panel BNC connectors from the front panel. (There may be four, two, or no
connectors depending on the presence of Option 002 and Option 004.) Be sure t o identify which
cable goes in which hole. (A simple identification scheme is t o put the nut back on the connectors
for the “HIGH” outputs only.) The front panel should now be free of the instrument.
9. Remove the “LINE” keycap from the line switch. The switch’s stem is easily snapped or pulled
out of the switch’s body. When removing the keycap, do not allow the stem to flex and do not
hold the body of the switch. Pull the keycap straight out.
10. Press the new, unlabeled keycap (HP 0371-3802) on the line switch.
Transferring the A5 LCD Display
11. Remove the four Torx screws with lockwashers (items 44, 45, 49, and 51 in figure 6-3) securing
the old display shield (item 39) to the old front panel and remove the display shield.
12. Remove the four Torx screws with lockwashers (items 40 through 43 in figure 6-3) securing the
A5 LCD Display to the old front panel and remove the display. (The screws will not be reused.)
13. Remove the four Torx screws and captive lockwashers securing the new display shield to the new
front panel and temporarily remove the new display shield.
14. Install the LCD display on to the new front panel securing it with the four new screws and
captive lockwashers (HP 0515-1851) from the kit. Tighten the screws to 0.6 N.m (5 inelb).
15. Re-install the new display shield on to the new keyboard with the four screws and captive
lockwashers removed in step 13. Alignment of the shield is critical. The shield should be pulled
up as high as the screw slots will allow. Tighten the screws to 1.1 N.m (9 in.lb).
7-16
Firmware Updates/Hardware Modifications
rev.15DEC89
Model 8904A
Instrument Changes
Installing the Front Panel
16. Remove any existing, unneeded hole plugs from the new front-panel assembly.
17. Install the line switch bracket supplied in the kit (HP 08904-00022, item 142 in figure 7-6, Detail
A herein) on to the line switch using the two Pozidriv screws supplied in the kit (HP 0515-2028,
items 143 and 144). Tighten the screws to 0.6 N.m (5 in.lb).
18. Install the line switch bracket on to the front frame using two of the screws (items 84 and 145
in figure 7-6) securing the old front panel to the frame (item 89). Do not tighten the screws at
this time.
19. Connect the wide ribbon cable (AlW1 in figure 1) from the new keyboard t o the front of the A2
Digital Assembly. Be careful not to bend any pins.
20. Place the new front panel into the frame and loosely secure the assembly to the frame on the top
and sides with the original screws. Check that the cables to the front panel and the line switch
keycap are positioned correctly before pushing the front panel completely into the frame.
21. Tighten the screws in the frame in the following sequence: item 76, 80, 81, 75, 78, 77, then 79.
Tighten the screws to 1.3 N.m (11in.lb). If the top screws bind, remove the front panel and try
repositioning the display shield installed in step 15.
22. Position the line switch in the frame and the hole in the front panel then tighten the securing
screws (items 84 and 145). Tighten the screws to 1.3 N.m (11in.lb).
23. Re-install the BNC connectors to the new front panel as applicable. Be sure the connectors go
to the proper front-panel holes.
24. Reconnect the two connectors from the A5 LCD Display to the A2 Digital Assembly.
Final Assembly and Testing
25. Re-install the top and side trim strips and the covers.
26. Check the general functioning of the instrument by performing the Basic Functional Checks in
the Operation and Calibration Manual. Also, check the functioning of all front-panel keys and
the line switch.
rev.15DEC89
Firmware Updates/Hardware Modifications
7-1 7
Model 8904A
Instrument Changes
Figure 7-6.Dont-Panel Assembly, (2923A and above)
7-18
Firmware UpdatesIHardware Modifications
reu.15DEC89
HP8904A
Table of Contents
TABLE OF CONTENTS
Section 8
Service
Introduction To This Section . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
8-1
How The Section Is Organized . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
8.1
Safety Considerations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
81
.
Service Tools, Helps, and Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
8.1
Schematic Symbology and Schematic Diagram Notes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
8.3
8-15
Principles of Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Overall . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
8-15
8-23
A2 Digital Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
A3 Output Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
8-24
Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
8-29
General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
8-29
8-30
A2 Digital Assembly To A3 (or A10) Output Assembly Interface . . . . . . . . . . . . . . . . . . . . .
8-38
A2 Digital Assembly To A1 Keyboard Assembly Interface . . . . . . . . . . . . . . . . . . . . . . . . .
A2 Digital Assembly To A5 Display Assembly Interface . . . . . . . . . . . . . . . . . . . . . . . . . .
8-41
8-42
A3 or A10 Output Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
8-42.1
Phase Synchronization (Option 005) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
How To Restore the Serial Number In a Replacement A2 Digital Assembly . . . . . . . . . . . . . . . . . 8-43
How To Restore Options 001. 003. and 005 I n A Replacement A2 Digital Assembly . . . . . . . . . . . . . 8-46
How To Replace the Memory Backup Battery . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
8-48.1
Service Sheet 1 (Output Assembly) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
8-51
8-53
Service Sheet 2 (Output Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
8-53
Service Sheet 3 (Output Assembly) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
8-55
Service Sheet 4 (Output Assembly) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Service Sheet 5 (High Power Output Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
8-57
Model 8904A
Service
Section 8
SERVICE
8-1. INTRODUCTION TO THIS SECTION
This section contains information for troubleshooting and repairing the Multifunction Synthesizer.
Included are principles of operation, troubleshooting checks, and schematic diagrams for selected
circuits.
8-2. HOW THE SECTION IS ORGANIZED
Section 8 contains the following:
0
0
0
e
0
0
Safety Considerations
Service Tools, Helps, and Information
Schematic Symbology and Diagram Notes
Principles of Operation
Troubleshooting
Selected Schematic Diagrams and Component Locators (Foldouts SS1 through SS4)
8-3. SAFETY CONSIDERATIONS
Before Applying Power
Verify that the instrument is set to match the available line voltage and that the correct fuse is installed.
An uninterrupted safety earth ground must be provided from the main power source to the instrument
input wiring terminals, power cord, or supplied power cord set. In addition, verify that a common
ground exists between the Multifunction Synthesizer and all test equipment.
Safety
Pay attention to warnings and cautions. They must be followed both for your protection and to avoid
damage to the equipment.
1-1
Who should service the instrument? Maintenance described herein is
performed with power supplied to the instrument and with the protective
covers removed. Such maintenance should be performed only by servicetrained personnel who are aware of the hazards involved (for example, fire
and electrical shock). When maintenance can be performed without power
supplied, the power should be removed.
8- 1
Service
I
Model 8904A
WARNING
I
Proper grounding of the instrument. A n y interruption of the protective
(grounding) conductor (inside or outside the instrument) or disconnection of
the protective earth terminal will create a potential shock hazard that could
result in personal injury. Grounding one conductor of a two conductor outlet
is not sufficient. Whenever it is likely that the protection has been impaired,
the instrument must be made inoperative (that is, secured against unintended
operation).
I f this instrument is to be energized via an autotransformer, make sure that
the autotransformer’s common terminal is connected to the earth terminal of
the power source.
High voltages inside the instrument. Areas with line voltages inside the
instrument include the rear panel, power supply, and the line switch cable
harness. AC voltages as high as 300 V p p can be present on the backlighting
drive to the LED display. (The drive circuitry is on the front right corner of
the A 2 Digital Assembly.)
Working around charged capacitors. Capacitors inside the instrument
can still be charged even if the instrument is disconnected from its source of
supply.
Replacing line fuses. Make sure that only 250 volt fuses with the required
rated current and of the specified type (normal blow, time d e b , etc.) are used
for replacement. Do not use repaired fuses or short-circuited fuseholders. To
do so could create a shock or fire hazard.
Disposing o f the memory backup battery. The memory backup battery
on the A2 Digital Assembly is a lithium battery. (A2 is the large, horizontal
circuit board under the top cover near the front of the instrument. The battery
itself is near the front right corner of the board.) The following procedure is
recommended for its disposal:
Discharge the battery by soldering a 50 k R resistor across both battery
terminals. Complete discharge will occur after one year, at 25°C.
Under Resource Conservation Recovery Act (RCRA) regulations, the completely discharged battery is considered “nonhazardous. However, the user
must be responsible for individual state and country regulations for battery
disposal.
Do not unplug any boards in the Multifunction Synthesizer unless the
instrument is unplugged or switched to S T B Y (standby). Some boards contain
devices which can be damaged if the board is removed when the power is on.
Use conductive foam when removing MOS devices from sockets. Use care
when unplugging ICs from high-grip sockets.
8-2
rev.15DEC89
Model 8904A
Service
8-4. SERVICE TOOLS, HELPS, AND INFORMATION
Printed Circuit Board Extractor
A Printed Circuit Board Extractor (HP 08904-00012) is supplied as part of this manual. It eases removal
of the A3 and A10 Output Assemblies. It hooks under the board or the metal board shield so the board
can be pulled off the mounting studs.
Assembly, Parts, and Cable Locations
The exploded view drawings at the end of Section 6 will assist in locating circuit board assemblies,
cables, and mechanical hardware.
For the A3 and A10 assemblies only, the locations of individual components mounted on printed-circuit
boards are shown adjacent to the schematic diagram on the appropriate service sheet. The part reference
designator is the assembly designator plus the part designator. For example, A3R9 is resistor R9 on
the A3 assembly. For specific component descriptions and ordering information, refer to Table 6-3,
Replaceable Parts, in Section 6. Mechanical chassis parts have reference designators with no prefix
letter.
Other Service Documents
Service Notes, Manual Updates, and other service literature are available through Hewlett-Packard.
For further information about Manual Updates, refer to Volume 1, paragraph 1-11.
Recommended Test Equipment and Accessories
Test equipment and test accessories required to maintain the Multifunction Synthesizer are listed in
Table 1-2. Equipment other than that listed may be used if it meets the listed critical specifications.
8-5. SCHEMATIC SYMBOLOGY AND SCHEMATIC DIAGRAM NOTES
Table 8-1 summarizes the symbology used in presenting many devices found in the instrument. The
logic symbols used in this manual are based on the Institute of Electrical and Electronic Engineers
(IEEE) in IEEE-STD 91-1984, Graphic Symbols for Logic finctions. This publication may be
purchased from:
Institute of Electrical and Electronic Engineers
345 East 47th Street
New York, NY 10017
8-3
Model 8904A
Service
Table 8-1. Schematic Diagram Notes (1 of 11)
Board
Assefnb l y
Board
Board
Test points: s y m b o l s
are n u m b e r e d for easy
correlation to schematic
diagrams. procedures.
and c o m p o n e n t location
d i a g r a m s . Connection t o
circuit signifies
m e a s u r i n g a i d (metal
Interconnect
information;
Circled letter
with a d j a c e n t
number indicates
circuit-path
continuation to
another service
s h e e t (3. in
this example).
Look for same
circled letter
on the indicated
Plug-in
inf o r m a t ion;
number
indicates
p i n of s o c k e t
Circuit
functional
Socket
designation
on A 2
information.
Solder point
numbered.
Wire'color c o d e .
Code u s e d
(MIL-STD-661)
is t h e s a m e
as the resistor
color c o d e .
First n u m b e r
identifies the
base color.
second number
the wider stripe,
and t h e t h i r d
number t h e
narrower stripe.
*
Example:
d e n o t e s w h i t e base.
yellow w i d e stripe.
violet n a r r o w s t r i p e
8-4
Seriai Prefix o f
instrument to
which Schematic
directly applies.
Reference
designations
within outlined
assemblies are
abbreviated. F u l l
designation i n c l u d e s
assembly number:
for example.
R l o f assembly
A 2 is A 2 R I .
Designations o f
other components
a r e complete
as shown.
ss2
Connector s y m b o l s w i t h i n
t h e b o r d e r l i n e s of b o a r d
assemblies signify
connections to the assembly
which a r e s e p a r a t e
from t h o s e made t h r o u g h
t h e integral plug p a r t
o f the assembly.
Asterisk i n d i c a t e s f a c t o r y
s e l e c t e d c o m p o n e n t s . (See
S r r t 4 n n ",
<\ .
"""___..
Value s e l e c t e d for best o p e r a t i o n
Value s h o w n is a v e r a g e o r most
commonly s e l e c t e d v a l u e .
\
'Large
numbers
in lower
r i g h t c o r n e r s of
schematic diagrams
are service
sheet numbers.
Model 8904A
Service
Table 8-1. Schematic Diagram Notes (2 of 11)
Values for all components are marked in units of farads, henries, and ohms unless otherwise specified.
*
Asterisk denotes a factory-selected value. Value shown is typical. See Section V.
Tool-aided adjustment.
0
Encloses front-panel designation.
Encloses rear-panel designation
Circuit assembly borderline
Other assembly borderline.
Heavy line with arrows indicates path and direction of main signal
Heavy dashed line with arrows indicates path and direction of main feedback.
-0-
F-
Indicates stripline (Le.. RF transmission line above ground).
Wiper moves toward cw with clockwise rotation of control (as viewed from shaft or
knob).
Numbered Test Point
measurement aid provided.
U
c
Encloses wire or cable color code. Code used is the same as the resistor color code.
First number identifies the base color, second number identifies the wider stripe, and
the third number identifies the narrower stripe, e.g., (917) denotes white base, yellow
wide stripe, violet narrow stripe.
A direct conducting connection to earth, or a conducting connection to a structure
that has a similar function (e.g., the frame of an air, sea, or land vehicle).
m
A conducting connection to a chassis or frame.
-4
Common connections. All like-designation points are connected.
12
Letter = off-page connection.
Number = Service Sheet number for off-page connection.
In the example, signal flow is continued on Service Sheet 12, at the point
marked
Number (only) = on-page connection
8-5
M o d e l 8904A
Service
4
Table 8-1. Schematic Diagram Notes (3 of 11)
-L
,,
J.
3
,,
2
1
,
,
Indicates multiple paths represented by only one line. Letters or names identify individual paths. Numbers indicate number of paths represented by the line.
2
'
I
Coaxial or shielded cable.
Ferrite bead. (Increases the self-inductance of the conductor passing through the
bead.)
Relay. Contact moves in direction of arrow when energized.
Indicates a pushbutton switch with a momentary (ON) position.
Y
T
Feedthrough capacitor. (Acts as a feedthrough terminal when mounted on a chassis
or a frame.)
Indicates a PIN diode.
Indicates a current regulation diode.
Indicates a voltage regulation diode.
4
Indicates a capacitive (varactor) diode.
Indicates a Schottky (hot-carrier) diode.
Light-emitting diode.
Multiple transistors in a single package-physical location of the pins is shown in
package outline on schematic.
Identification of logic families as shown (in this case, ECL).
8-6
Model 8904A
Service
llzble 8-1. Schematic Diagram Notes (4 of 11)
DIGITAL SYMBOLOGY REFERENCE INFORMATION
Input and Output Indicators
Implied Indicator-Absence of polarity indicator (see below) implies that the active
state is a relative high voltage level. Absence of negation indicator (see below) implies that the active state is a relative high voltage level at the input or output.
Polarity Indicator-The
Dynamic Indicator-The
high voltage level.
Inhibit Input-Input
digital device.
Analog Input-Input
active state is a relatively low voltage level.
active state is a transition from a relative low to a relative
that, when active, inhibits (blocks) the active state outputs of a
that is a continuous signal function (e.g., a sine wave).
Polarity Indicator used with Inhibit Indicator-Indicates that the relatively low level
signal inhibits (blocks) the active state outputs of a digital device.
Output Delay-Binary output changes state only after the referenced input (m) returns to its inactive state (m should be replaced by appropriate dependency or function symbols).
Open Collector Output.
Open Emitter Output.
Three-state Output-Indicates outputs can have a high impedance (disconnect) state
in addition to the normal binary logic states.
8-7
Model 8904A
Service
Table 8 - 1 . Schematic Diagram Notes (5 of 11)
DIGITAL SYMBOLOGY REFERENCE INFORMATION
c
Combinational Logic Symbols and Functions
Summing Junction-Outputs
added together at a common point.
8
AND-All
inputs must be active for the output to be active.
21
OR-One
or more inputs being active will cause the output to be active.
zm
Logic Threshold-m or more inputs being active will cause the output to be active
(replace m with a number).
=1
EXCLUSIVE OR-Output
=m
m and only m-Output
m with a number).
will be active when one (and only one) input is active.
will be active when m (and only m) inputs are active (replace
Logic Identity-Output will be active only when all or none of the inputs are active
(Le., when all inputs are identical, output will be active).
Amplifier-The output will be active only when the input is active (can be used with
polarity or logic indicator at input or output to signify inversion).
Signal Level Converter-Input
level(s) are different than output level(s).
Bilateral Switch-Binary controlled switch which acts as an on/off switch to analog
or binary signals flowing in both directions. Dependency notation should be used
to indicate affecting/affected inputs and outputs. Note: amplifier symbol (with dependency notation) should be read to indicate unilateral switching.
x-Y
(Functional Labels)
MUX
DEMUX
CPU
8-8
Coder-Input
code (X) is converted to output code (Y) per weighted values or a table.
The following labels are to be used as necessary to ensure rapid identification of
device function.
Multiplexer-The
output is dependent only on the selected input.
Demultiplexer-Only the selected output is a function of the input.
Central Processing Unit
Service
Model 8904A
Table 8-1. Schematic Diagram Notes (6 of 11)
DIGITAL SYMBOLOGY REFERENCE INFORMATION
I
n
Sequential Logic Functions
Monostable-Single shot multivibrator. Output becomes active when the input becomes active. Output remains active (even if the input becomes inactive) for a period
of time that is characteristic of the device and/or circuit.
G
Oscillator-The output is a uniform repetitive signal which alternates between the
high and low state values. If an input is shown, then the output will be active if an
only if the input is in the active state.
FF
Flip-Flop-Binary element with two stable states, set and reset. When the flip-flop
is set, its outputs will be in their active states. When the flip-flop is reset, its outputs
will be in their inactive states.
T
Toggle Input-When
S
Set Input-When
R
Reset Input-When
active, causes the flip-flop to reset.
J
J Input-Analogous
to set input.
K
K Input-Analogous
to reset input.
D
Data Input-Always enabled by another input (generally a C input-see Dependency
Notation). When the D input is dependency-enabled, a high level at D will set the
flip-flop; a low level will reset the flip-flop. Note: strictly speaking, D inputs have no
active or inactive states-they are just enabled or disabled.
nJ--Ln
active, causes the flip-flop to change states.
active, causes the flip-flop to set.
“m”
+m
Count-Up Input-When active, increments the contents (count) of a counter by
counts (m is replaced with a number).
-m
Count-Down Input-When active, decrements the contents (count) of a counter by
“m” counts (m is replaced with a number).
-m
Shift Right (Down) Input-When active, causes the contents of a shift register to
shift to the right or down “m” places (m is replaced with a number).
-m
Shift Left (Up) Input-When active, causes the contents of a shift register to shift
to the left or up “m” places (m is replaced with a number).
NOTE
For the four functions shown above, if m is one, it is omitted.
(Functional Labels)
The following functional labels are to be used as necessary in symbol build-ups to
ensure rapid identification of device function.
mCNTR
Counter-Array of flip-flops connected to form a counter with modules m (m is replaced with a number that indicates the number of states: 5 CNTR, 10 CNTR, etc.).
8-9
Model 8904A
Service
Table 8-1. Schematic Diagram Notes (7 of 11)
DIGITAL SYMBOLOGY REFERENCE INFORMATION
Sequential Logic Functions (Cont’d)
REG
Register-Array of unconnected flip-flops that form a simple register or latch.
SREG
Shift Register-Array of flip-flops that form a register with internal connections that
permit shifting the contents from flip-flop to flip-flop.
ROM
Read Only Memory-Addressable
RAM
Random Access Memory-Addressable
capability.
memory with read-out capability only.
memory with read-in and read-out
Dependency Notation
Crn
Control Dependency-Binary affecting input used where more than a simple AND
relationship exists between the C input and the affected inputs and outputs (used
only with D-type flip-flops).
Gm
Gate (AND) Dependency-Binary affecting input with an AND relationship to those
inputs or outputs labeled with the same identifier. The m is replaced with a number
or letter (the identifier).
Vm
OR Dependency-Binary affecting input with an OR relationship to those inputs or
outputs labeled with the same identifier. The m is replaced with a number or the
letter (the identifier).
mAm
Address Dependency-Binary affecting inputs of affected outputs. The m prefix is
replaced with a number that differentiates between several address inputs, indicates
dependency, or indicates demultiplexing of address inputs and outputs. The m suffix
indicates the number of cells that can be addressed.
ENm
Enable Dependency-Binary affecting input which, when active enables all outputs.
When inactive open-collector and open-emitter outputs are off, and three-state outputs are at an external high impedance state.
When the enable input affects only certain inputs and outputs, they will be numbered
to indicate the logic connection.
Xm
Transmission Dependency-Binary
pendent inputs and outputs.
Mm
Mode Dependency-Binary affecting input used to indicate that the effects of particular inputs and outputs of an element depend on the mode in which the element
is operating. The m is replaced with a number or letter (the identifier).
Zm
Interconnection Dependency-Indicates the existence of internal logic connections
between inputs, outputs, internal inputs, and/or internal outputs. The m is replaced
with a number (the identifier).
Comma-AND
I
Slant-OR
affecting input which bidirectionally connects de-
Function.
Function.
NOTE
The identifier (m) is omitred if it is one-that is, when there is only one dependency relationship of rhat kind in a particular device. When this is done, the dependency indicator itself (G,C, EN, or V) is used to prefix or suffix the affected
(dependent) input or output.
5-10
Model 8904A
Service
llable 8-1. Schematic Diagram Notes (8 of 11)
DIGITAL SYMBOLOGY REFERENCE INFORMATION
nActive
Miscellaneous
Schmitt Trigger-Input characterized by hysteresis; one threshold for positive going
signals and a second threshold for negative going signals.
Active State-A binary physical or logical state that corresponds to the true state
of an input, an output, or a function. The opposite of the inactive state.
8-11
Model 8904A
Service
Table 8-1. Schematic Diagram Notes (9 of 11)
NAND GATE
AND GATE
OR GATE WITH
INVERTED INPUTS
L
B
H
L
L
L
H
H
L
H
H
NOR GATE
A
B
OR GATE
B
X
AND GATE WITH
INVERTED INPUTS
L
H
L
H
L
"B
a
x
BUFFER
EXCLUSIVE-OR
GATE
X
Wl
L
H
INVERTER
OPEN COLLECTOR
OUTPUTS (TTL)
.'
,'
I
1
I
OPEN EMITTER
OUTPUTS (ECL)
+V
EXTERNAL
PULL-UP
RES1STOR
1
+V
I
1
I
I
EXTERNAL
PULL-DOWN
RESISTOR
8-12
I
::
,*'
lv
Model 8904A
Service
Table 8-1. Schematic Diagram Notes (10 of 11)
€3
A-L
I
ACTIVE LEVELS
Active High Input
C
ACTIVE HIGH inputs and outputs are indicated by the absence of the polarity indicator symbol.
ACTIVE
I LEVEL I
Active High Output
97
< +
Active Low Input
ACTIVE LOW inputs and outputs are indicated by the presence of the polarity indicator symbol ( h ) .
I
4ACTIVE t
I
Active Low Output
LEVEL
I
EDGE SENSITIVE INPUTS
EDGE SENSITIVE (low-to-high) inputs are indicated by the
presence of the dynamic indicator symbol ( +).
Edge Sensitive
High-to-Low
Edge Sensitive
OUTPUT
I
I
+
EDGE SENSITIVE (high-to-low) inputs are indicated by the
presence of both the dynamic indicator and the polarity indicator symbols (
OUTPUT
I
’.
I
DELAYED OUTPUT RESPONSE
I
INPUTJ-C
-OUTPUTDelayed Output
(Active High Input)
Delayed Output
(Active Low Input)
I [ OUTPUT DELAY indicator symbol (7) shows that the outI
put becomes effective after the input signal returns to its
inactive state.
I
INHIBIT INPUTS
U
INHIBIT indicator symbol (+) indicates an input that, when
active, inhibits (blocks) the output(s) from achieving their
active states (the outputs remain inactive).
ANALOG LINES
ANALOG indicator symbol
an analog input or output.
(n)indicates a line that has
NONLOGIC CONNECTION
The Nonlogic Connection symbol (X) indicates a connection that does not carry any logic information.
8-13
M o d e l 8904A
Service
Table 8-1. Schematic Diagram Notes (11 of 11)
AND
The input that controls or gates other inputs is labeled with a C or a G,
followed by an identifying number.
The controlled or gated input or output is labeled with the same number.
In this example, 1 is controlled by G1.
OR
When a V input is active, the output will be in its active state. With the
V input inactive, the device functions as if the V input doesn’t exist.
ENABLE
When the EN input is active, the output is enabled to function normally.
When the EN input is inactive, the three-state output ( V), in this case,
becomes a high impedance, effectively removing that device from the
circuit.
TRANSMISSION
When the X1 input is active, the associated input-output pair are bidirectionally connected together. When X1 is inactive, the connection is
broken.
CONTROL
When the controlled or gated input or output already has a functional
label (D is used here), that label will be prefixed by the identifying
number.
If the input or output is affected by more than one gate or control input,
then the identifying numbers of each gate or control input will appear
separated by commas.
ADDRESS
When GA is active, the active address line (0 through 3) is the decoded
value of the 1 and 2 binary inputs. When the controlled address lines
have a functional value, that value will be prefixed by the identifying
letter.
GA
i-14
Model 8904A
Service
PRINCIPLES OF OPERATION
OVERALL
What the Multifunction Synthesizer Can Do
The HP 8904A Multifunction Synthesizer is a general purpose function generator which can output
complex signals based on combinations of six waveforms:
sine
sawtooth
triangle
square
noise
dc
Control over these signals includes:
frequency,
amplitude, and
phase.
Signals can (with Option 001) be combined by summation and/or modulation. The modulation formats
are:
AM
DSB
FM
pulse
@M
Long, complex sequences can (with Option 001) be output based on:
tones
DTMF (Dual Tone Multi Frequency)
digital
Channel A can (with Option 003) be phase-continuous fast-hopped with external control of:
timing
frequency
amplitude
phase
All of the above signal combinations can (with Option 002) be output to a second port. The output
ports can be single-ended or floating.
How Waveforms Are Generated
Waveforms are generated by a numerical synthesis technique. The heart of the synthesizer is a single
digital waveform synthesis integrated circuit (DWSIC). For each channel, the DWSIC generates a
continuous stream of numbers which represent instantaneous levels of the waveform. This "digital"
waveform is then converted to an analog signal by a digital-to-analog converter or DAC (one converter
for each output port). The analog signal is conditioned by high-performance (but conventional) analog
circuitry and routed to the output connector. The conditioning circuits include a sample-and-hold
to remove DAC switching noise, filters to remove quantization noise (that is, smooth the transitions
between samples from the DAC), amplifiers to boost the maximum output, and attenuators to increase
the outputs dynamic range.
Figure 8-1 is a conceptual block diagram of the simplest configuration of the instrument-one
Options 001, 002, or 003. The blocks indicate conceptually how tlie data is handled.
Principles of Operation (Overall)
without
8-15
Model 8904A
Service
CHANNEL A
I
6
‘L
PHASE
FREOUENCY
Figure 8-1. Conceptual Block Diagram of a Standard Instrument
The standard instrument has only one channel-Channel A. Channel A can output one of the six
available waveforms. Four of the waveforms (sine, sawtooth, triangle, and square) are periodic and thus
have a frequency and phase which can be controlled. The level of all waveforms can be controlled.
(Level is controlled in both the DWSIC and the analog output circuits.)
The DWSIC
The DWSIC, in response to front-panel or HP-IB inputs directed to the instrument’s internal computer,
generates the basic waveforms (in their digital form) for each channel, modulates and combines them
(still in digital form) as requested, and delivers them to the appropriate digital-to-analog converter.
Figure 8-2 shows a one-channel portion of the DWSIC. The diagram is highly simplified but detailed
enough to illustrate general concepts such as
0
0
0
0
AM DATA
generation of a basic sine wave
setting and modulating its phase
setting and modulating its frequency
setting and modulating its amplitude
I
2
FREOUENCY
ADDER
FREO DATA
CLOCK
90
+
c-
I
PHASE
PHASE
WAVEFORM
.
P
C ’
LATCH
-0
P
7
J
AMPLITUDE
MULTIPLIER
Figure 8-2. Simplified Diagram of One Channel of the D WSIC
8-16
Principles of Operation (Overall)
rev.lOOCT88
Modei 8904A
Service
In many ways the figure resembles an analog function generator, and it may be helpful at times to
visualize DWSIC operation using this analogy. (For example, the Waveform Table is analogous to an
analog shaping circuit.) However, in the DWSIC all signal lines carry signal information as binary
codes. Thus, the “waveforms”shown in the following figures are not really voltage-versus-timeplots but
are coded-value-versus-timeplots. Conversion to an analog signal occurs at the output of the DWSIC
and is not shown in Figure 8-2.
It should be noted in Figure 8-2 that each interconnect line in the diagram generally represents a data
bus several bits wide.
Generating Staircases in the Phase Accumulator
Look first at the Phase Accumulator and Latch in Figure 8-2. The Phase Accumulator is a binary
adder-its output is the sum P+Q. The output of the Phase Accumulator is the data (D) input of the
Latch. This input is clocked through the latch once each period of the Clock input. The output of the
latch feeds back to the Q input of the Phase Accumulator.
For purposes of illustration, assume all data is carried on four-bit buses. Also assume that inputs to the
Frequency Adder are constants so that the P input of the Phase Accumulator is a four-bit constant P.
(The Frequency Adder will be discussed later.) P can theoretically take on values between 0 and 24-1
or 15 (in decimal). This constant represents a fixed frequency as will be seen shortly. Each clock period
the Latch outputs the sum of the input P and the output of the Phase Accumulator of the previous
clock period.
For example, if P=l and the Latch output for the last clock period was 6, the Phase Accumulator
outputs 6+1=7 on the next clock period, 7+1=8 on the next, and so forth until the output reaches
15fl. At this time, the output goes to 0 since Phass Accumulator discards carries. From 0 the Phase
Accumulator increments once each clock period. Fig-re 8-3 illustrates the resulting staircase and also
shows what happens when P=2 and 3.
15
0
15
0
--
P= 1
P=2
t
t
P=3
Figure 8-3. The Output of the Phase Accumulator for P = l , 2, and 3
Principles of Operation (Overall)
8-17
Service
Model 8904A
P=3 is an interesting case. The count sequence (in decimal) is 0, 3, 6, 9, 12, 15, 2, 5, 8, 11, 14, 1,
4, 7, 10, 13, 0, etc. The Latch outputs three uneven staircases that repeat every 16 clock periods.
In general, if P is not 0 but is small compared to the number of possible states (16 in the current
example), the Latch outputs a series of staircases (sometimes uneven) with a frequency equal to the
Clock frequency x P + 16.
Adding Phase Shift
F’rom the Latch the waveform data is added to the @MData in the Phase Adder. If the @MData is a
constant (assumed still to be four bits), the waveform data is shifted (delayed) by the constant. Figure
8-4 illustrates the delay generated by a Phase Adder P input of P=O, 1, and 2 where P is the @MData
input to the Phase Adder. (The Q input to the Phase Adder is the bottom waveform of Figure 8-3.)
Generating a Sine Wave
So far the “waveform”, still a numerical representation, is a staircase. The staircase itself is one of the
waveforms available at the channel outputs. (After analog conversion and filtering, the waveform is a
ramp.) To convert the staircase into a sine wave, the data from the Phase Adder is fed into the Waveform
Table (a look-up table resident in a read-only memory (ROM)) which digitally shapes the staircase.
Input the value of the staircase into the table and the ROM outputs the corresponding magnitude of
a sine wave.
The process is illustrated in Figure 8-5. In the first example the frequency data into the P input of
the Phase Accumulator is the constant 3, and the @MData into the P input of the Phase Adder is the
constant 0.
t
P=O
15
0
P= 1
P=2
t
Figure 8-4. The Output of the Phase Adder for P=O, 1, and 2
8-18
Principles of Operation (Overall)
Model 8904A
Service
I
-: t
0
-1 3-
4 BITS
5 BITS
6 BITS
~
~
~
~
~~
Figure 8-5. T h e Output of the Waveform Table with Data Bus Widths of 4, 5, and 6 Bits
With a four-bit data bus, the poor resemblance to a sine wave is apparent. With only four-bit
quantization, the resolution is very coarse. A vast improvement is made by increasing the number of
quantization states by increasing the width of the data buses. Examples of 5 and 6 bit data buses are
also illustrated in Figure 8-5. In the instrument, the bus width used in the DWSIC is actually 12 bits;
the total number of quantization levels is 212=4096.
Controlling Amplitude
The Amplitude Multiplier scales (by digital multiplication) the amplitude of the waveform data by the
factor on the AM Data bus, thus controlling the signal level. For CW outputs the scaling covers a 2:l
range. Further level control occurs in the analog output circuitry.
Further Digital Waveform Processing with Options
Thus far, all data inputs have been assumed to be constants which control frequency, phase, and
amplitude. In practice the data inputs may vary with time and thus modulate the waveforms. This
feature requires Option 001. In the Fkequency Adder, the Frequency Data is held constant to set the
CW frequency; the FM Data can be varied to generate FM. In the Phase Adder, QM Data is varied to
generate QM. In the Amplitude Multiplier, the AM Data is held constant to set the CW level or it can
be varied .about the level constant to generate AM.
In addition to modulation, waveforms from other channels can be summed (digitally, of course) with
channel one t o create waveforms of specific shapes and characteristics. Implementation of these
additional capabilities is illustrated in Figure 8-6.
Figure 8-6 also shows a second output channel which is included as Option 002. If Option 002 is added
without Option 001, any of the six basic waveforms can be generated at the second output independent
of the first output, but neither output can be modulated or summed.
Principles of Operation (Overall)
8-19
Model 8904A
Service
~
-
*
CHANNEL A
t
OUTPUT!
LEVEL
I
PULSE
t
r_+_o
'L
x
'L
CHANNEL
LEVEL
PHASE
FREOUENCY
B
PULSE
\SUM
p
1
Lt-
FREOUENCY
LEVEL
SUM
q
LEVEL
9
@
CHANNEL C
CHANNEL
PHASE
0
/L
FREOUENCY
PHASE
0
'L
FREOUENCY
D
Figure 8-6. Conceptual Block Diagram of an Instrument with Options 001 and 002
8-20
Principles of Operation (Overall)
I
Model 8904A
Service
f=pjT
SAMPLER
D7E
Figure 8-7. Analog Output Block Diagram
Analog Waveform Processing
The analog waveform processing block diagram is shown in figure 8-7. Instruments with Option 002
have a second, identical output assembly. The DAC receives digital inputs from the instrument’s
controller and converts them to an analog voltage. Because the DAC output has significant switching
transients, each new output is sampled after settling. The Sampler Amplifier buffers the output of the
Sampler.
The Low-Pass Filter is needed to accurately construct the sample-generated waveform. For smooth
waveforms, such as sinewaves, a sharp-cutoff filter is selected its 3 dl3 corner is approximately 670 kHz.
For waveforms less smooth, such as triangle waves or tone bursts, a low-overshoot filter is selected
with a 3 dE3 corner of 230 kHz.
The Audio Amplifier has 19 dEl gain and passes signals up to 600 kHz with good flatness and low
distortion. Attenuator 1 can be programmed for 0, 6, 12, or 24 dB attenuation. It reduces the need for
large level range control in the DWSIC and thereby maintains waveform fidelity a t low levels.
The Floating Output Amplifier is a single-ended-to-differential converter with a gain of 1.12. In its
float mode, either the high or the low output (not shown in the block diagram) can be floated up to
10 V while the signal from the instrument itself appears on the other output. Output impedance is
50R. Attenuator 2 can be programmed for 0 or 48 dB.
Both the high and low outputs are protected from inadvertent application of a large reverse voltage by
the Overvoltage Detector and Relay. When a large output voltage is sensed the Overvoltage Detector
opens the relay. The relay is reset by the instrument’s controller when any key is pressed if the
overvoltage condition has been removed.
If the instrument has Option 006 (balanced output), Output 1 is floated by means of a balancing
transformer (not shown in figure 8-7). The transformer provides a true balanced 600n output but
limits the useable frequency range and fidelity of the various non-sinusoidal waveforms.
Interrelationship of the Circuit Assemblies
Figure 8-8 and figure 8-8.1 diagrams the assemblies by assembly number and shows their interrelationship.
reu.15DEC89
Principles of Operation (Overall)
8-21
Service
Model 8904A
HP 8904A MULTIFUNCTION SYNTHESIZER
r - - - - I A2 DIGITAL ASSY
10 MHz
EXT
REF IN
-
>
L
A5
DISPLAY
ASSY
I
I
1
I
HP- I B
I
I
I
I
I
I
I
I
I
A4
POWER
SUPPLY
ASSY
I
t
DWSIC
-
-L A
<
I
10 MHz
REF
OUT
~-I
1
<
DIGITAL
PORT
OUTPUTS
1
OUTPUT
(OPT
0021
2
Figure 8-8. Interrelationship of Instrument Assemblies (Serial prefix 2942A and below)
8-22
Principles of Operation (Overall)
rev.15DEC89
Model 8904A
Service
IP 8 9 0 4 A
MULTIFUNCTION
r------
I
I
-p-t'
SYNTHESIZER
A 2 DIGITAL ASSY
HP-18
10 MHz
EXT REF IN
1
1
I
I
I
I DIGITAL
I
(OPT 005)
RE&{
OUTPUT
1-I
COMPU
INPUT
(OPT 005) OUTPUT
I
A1
ER
REF OUT
PORT
ASSY
OUTPUTS
Figure 8-8.1. Interrelationship of Instrument Assemblies (Serial prefix 2948A and above)
rev. 15DEC89
Principles of Operation (Overall)
8-22.1
Model 8904A
Service
A2 DIGITAL ASSEMBLY
General
The A2 Digital Assembly creates the output waveforms as a series of digital codes (via its DWSIC) and
performs the overall control and functioning of the instrument (via its microprocessor). Specific tasks
include
e
e
e
e
e
e
e
0
e
e
e
e
e
e
e
control the instrument’s general operation
create the digital waveforms
distribute waveform data to the proper output
control the programmable analog circuits (attenuators, filters, etc.)
retain instrument settings in RAM
backup RAM at power down
process keyboard, HP-IB, digital port, and overvoltage interrupts
scan the keyboard when a key press is detected
interface with HP-IB
generate the reference clocks
switch between internal and external references
control the beeper
generate and time the display backlight
control the front-panel displays and annunciators
output waveform data to the digital port
Because some circuits on the assembly are proprietary and because the assembly is available as
an exchange assembly, a schematic diagram with detailed theory and troubleshooting has not
been provided. Troubleshooting procedures to isolate a fault to the assembly can be found in the
troubleshooting section of this manual.
Principles of Operation (A2)
8-23
Service
Model 8904A
A3 OUTPUT ASSEMBLY (Service Sheets 1 through 4)
General
The A3 Output Assembly converts the digitally encoded waveform from the digital waveform synthesis
integrated circuit (DWSIC) on the A2 Digital Assembly to a precise and useable analog signal.
Instruments with Option 002 have a second Output Assembly (designated A10) which is identical
to A3. For troubleshooting purposes the two Output Assemblies can be interchanged or compared
node-for-node. Specifically, the Output Assembly contains:
0
0
0
0
0
the digital-to-analog converter
a track-and-hold circuit
clean up filters
amplifiers and attenuators
reverse power protection
Digital-to-Analog Converter (Service Sheet 1)
IC U6 is a 12 bit Digital-to-Analog Converter (DAC). Its function is to generate current with a
magnitude proportional to the weighted 12 bit input data from DWSIC via latches U4 and U5. New
data is output to the latches a t a 1.6777216 MHz clock rate. The latches hold the data until it is time to
clock the data to the DAC. Clocking of the latches is delayed 60 ns by U16 for optimum synchronization
of the DAC and the following Track-and-Hold Circuit.
The output of the DAC is converted to a voltage by the series combination of resistors R210, R224,
and R221. R224 (DAC Level) is adjusted to give the correct waveform amplitude. Connector 54 is a
convenient point for testing the DAC when jumper 5201 is moved to connect point 2 to point 3.
Track-and-Hold Circuit (Service Sheet 1)
After data is placed on the input of the DAC, the DAC requires 300 ns (that is, one-half clock period)
settling before its output is valid. The Track-and-Hold circuit following the DAC stores (holds) the
DAC’s previous valid output on a capacitor (C219 a t the input of the Sampler Amplifier) for 300 ns
while the DAC with its new input data settles. Then the DAC’s output is sampled and tracked for 300
ns.
The Track-and-Hold Circuit can be divided into three parts:
0
0
0
Sampler Drive
Sampler Switch
Sampler Amplifier
Sampler Drive
The Sampler Drive must provide sufficient current through transformer T1 to turn on hard the sampler
diodes (U201A, B, C, and F) in the Sampler Switch. When the sampler diodes are on, the voltage a t
the DAC output transfers to capacitor C219 a t the input of the Sampler Amplifier. Operation of the
Sampler Drive is most easily seen by referring to the simplified schematic of Figure 8-9.
8-24
Principles of Operation (A3)
Model 8904A
Service
R202
t15V
0201
4
4)
-
R206
b
FROM CLOCK SYNC U2A
(HIGH TRUE)
HI
c221
-
61
0205
CR206
c208
II
TI
-
c207
I
II
+bV
-
R205
R204
+15V
0202
--
I
tI
d
l
CR203
0206
R226
-15V
Figure 8-9. Simplified Diagram
of the Sampler Drive
Differential input transistors (Q205 and Q206) are driven in complement by the outputs of D flip-flop
U2A (the Clock Sync flip-flop). The emitter current for Q205 and Q206 is supplied by a common 10
mA current source. (The current source is Q207 and associated parts in the main schematic diagram.
Diode CR207 thermally tracks the base-emitter junction of Q207 to thermally compensate the current
source.) The current from the current source alternates between Q205 and Q206 each half clock period.
Diodes CR202 and CR203 clamp the collectors of Q205 and Q206 to approximately +6V; CR204 and
CR205 clamp the collectors to +lOV. Q204 and Q202 are emitter followers which drive one side of
transformer T1; Q203 and Q201 similarly drive the opposite side of T1 but are 180” out of phase.
Capacitor C201 forces the junction of R201 and R202 to follow the bases and emitters of Q201 and
Q203 with a fixed dc offset. C205 performs a similar function to the other half of the circuit.
Sampler Switch
The Sampler Switch connects the DAC to the Sampler Amplifier during the “sample” half of the clock
cycle; the Sampler Switch is open during “hold”. The switches are diodes U201A, B, C,and F. They
are switched by the Sampler Drive through T1.
When the switch diodes are off, diodes CR212 and CR208 charge capacitor C214 to approximately
2.7V.The charge on C214 has no effect when the switch diodes are on, but provides a strong initial
backbias to the switch diodes as they turn off.
Principles of Operation (A3)
8-25
Service
Model 8904A
+15V
&
+15v
R213
I
c201
II
11
+
TO LOW-PASS
FILTER
DAC-ANLSA’LIPLER
r
- 1
I;+(f\;
I
R216
I
iz
L - - - - I
t T H l S LINE IS AT GUARD
TRACE POTENTIAL
Figure 8-10. Simplified Diagram of the Sampler Amplifier
Sampler Amplifier
The Sampler Amplifier must accurately track the DAC output voltage when the Sampler Switch is
closed and faithfully hold the sampled voltage when the switch is open. For some waveforms (for
example, square and ramp) the DAC output may change abruptly several volts; these transitions must
pass through the Sampler Amplifier without distortion.
Refer to the simplified schematic of Figure 8-10 which shows the Sampler Amplifier without the guard
traces. The capacitor which holds the sampled voltage from the DAC is C219. It is followed by a
unity-gain amplifier which presents a very ‘high impedance to C219 (so as not to discharge it during
the “hold” period), responds quickly and stably to a wide variety of inputs, has no dc offset, and can
drive the load at its output.
The amplifier can be divided into two main stages: (1) a slower, high-gain input stage (U203 and
associated parts) and (2) a fast, lower-gain output stage (Q210 and following). The input stage assures
sufficient gain accuracy; the output stage assures quick response and output drive.
For high-frequency signal components, capacitor C201 bypasses the input stage so that the input signal
appears at the gate of FET Q210. A high input impedance is maintained because capacitors C226 and
C225 short resistors R216 and R218 respectively to the output of the output stage which is a unity-gain
follower. Both ends of R216 and R218 move in step with the input so no current flows through them.
Capacitor C2 17 prevents high-frequency components from entering U203. Capacitor C224 reduces the
high-frequency stage gain to unity to eliminate its influence.
For low-frequency components, the input signal appears at the non-inverting (+) input of U203. The
high, open-loop gain of U203 and the unity feedback force the inverting (-> input of U203 to precisely
follow the non-inverting input.
Refer now to Service Sheet 1. The guard traces associated with U203 prevent any significant leakage
of current from nearby circuit nodes of different potential on to highly-sensitive nodes such as C219.
Leakage is most severe when the humidity is high. The guard trace is at the same potential as the
input signal at all times since it is connected to the output of U202. Potentially error-producing leakage
currents flow harmlessly to the guard trace.
8-26
Principles of Operation (A3)
Model 8904A
Service
Low-Pass Filters (Service Sheet 2)
Precise construction of the analog waveform from the DAC requires careful filtering. Since the samples
from the DAC are clocked through at approximately 1.67 MHz, sampling theory dictates that a low-pass
filter of approximately 840 kHz or less is required; in practice the 3 dB corner will be less than this
but it must be greater than 600 kHz, which is the upper frequency limit for a sine wave.
The output from the Track-and-Hold Circuit is filtered by the Sharp Cutoff Filter (an elliptic function
filter) for sine waves, noise, and some types of complex waveforms (when automatically selected). The
filter is flat within f O . O 1 dB to 600 kHz and has a 3 dB corner at 670 kHz. Above 670 kHz the filter
rolls off rapidly but ripples in the stopband. Adjustments to the filter are made to keep the stopband
attenuation more than 68 dB beyond 1.07 MHz. For most other waveforms, the Low Overshoot Filter
(a Gaussian type filter) is automatically selected. The filter prevents ringing but limits the useable
frequency range to 50 kHz.
The Sharp Cutoff Filter is switched by relay K11, the Low Overshoot Filter by K10. The filters are
switched in complement-one or the other is always in. The filter control signal on line FLC is inverted
by peripheral driver U8A, which controls K10. The output of U8A is inverted by U8B, which controls
K11. A high on FLC switches in the Low Overshoot Filter.
The filters can be isolated and tested manually by connecting a signal source to 55 and moving jumper
53 to connect point 2 to point 3, and by connecting a signal analyzer to J6 and moving jumper 57 to
connect point 2 to point 3.
Audio Amplifier (Service Sheet 2)
The Audio Amplifier has a precise gain of 8.9 (19 dB).It must pass signals from dc to 600 kHz and
maximum levels of 8.9 Vpk with minimum introduction of ripple, distortion, noise, or dc offset. The
amplifier is a discrete design of a standard inverting operational amplifier. The gain is the ratio of the
parallel combination of R48 and R231 to R47.
The Audio Amplifier has three stages: (1) an input stage (U9, Q14, and Q E ) , (2) an intermediate,
high-gain stage (Q20 and Q21), and (3) an output driver stage (Q18 and Q19). The virtual ground of
the amplifier is the junction of C40 and R49.
In the input stage the ac component of the input signal flows through C40 and R56 into the base of
Q14. DC current flows through R49 and is amplified (and inverted) by U9. U9 functions as an integrator
providing large gain for dc and low gain for ac. The output of U9 is fed into the emitter of Q14 through
R53. Q14 differentially sums the ac and dc signals. Components C45, C46, and R57 form a lag-lead (at
1 MHz and 10 MHz) equalization critical for stabilizing the amplifier.
Q20 is a common-collector amplifier which drives common-base amplifier Q21 to form the intermediate
stage. Q21 drives the collector of Q16 (through Q17) which presents a high-impedance load to Q21 and
gives the intermediate stage high gain.
The output stage has unity gain. The complimentary transistor pair Ql8 and Q19 provide sufficient
current to drive the load. Q17 sets and thermally compensates the idle current in Ql8 and Q19. Bias
current for Q17 is generated by Q16. CR6 thermally compensates Q16.
Sine X/X Compensation (Service Sheet 2)
The Sine X/X Compensation filter compensates the natural roll-off of the sample-generated waveforms
up to 600 kHz. L11 is adjusted for best flatness at 550 kHz. The parasitic load capacitance is accounted
for in the network’s design.
6, 12, and 24 dB Attenuators (Service Sheet 3)
Three pi-section attenuators provide 6, 12, and 24 dB of programmable attenuation. Each attenuator
has an input impedance of 1 kR. C232 and C504 introduce a load capacitance that is constant for all
combinations of attenuation settings.
Principles of Operation (A3)
8-27
Service
Model 8904A
Floating Amplifier Driver and On/Off Switch (Service Sheet 3)
The On/Off Switch is opened for 15 ms when the Sharp Cutoff Filter is in and the frequency of the
signal is changed to prevent the ringing in the filter from getting t o the instrument’s output.
The unity-gain, inverting buffer amplifier formed by U403 and U404 isolates the Floating Output
Amplifier from the Sine X/X Compensation. The combination of resistors R412, R413, and R421 form
a 1 kR resistance which can handle the output current from the Audio Amplifier. U404 is a current
booster stage. C401 bypasses U404 a t high frequencies to stabilize the buffer at high frequencies. L401
and R416 compensate the high-frequency rolloff of the Floating Output Amplifier.
Floating Output Amplifier (Service Sheet 4)
The Floating Output Amplifier is a single-ended-to-differential converter. Conversion is accomplished
by a precise combination of negative feedback, positive feedback, and cross-coupling which yields a
symmetrical differential output with high common-mode rejection and a well-defined output impedance
of 50R. The complexity of the circuit makes detailed analysis difficult.
Output transistors Q401 through Q404 boost the current drive capability of differential amplifiers U401
and U402. Constant-current sources CR423 through CR426 provide bias current for diodes CR404
through CR407 and the bases of Q401 through Q404. CR423 through CR426 thermally compensate the
base-emitter junctions of Q401 through Q404. Q405 through Q408 shut off Q401 through Q404 when
the latter transistors start drawing too much current to protect the amplifier. Further protection is
provided by CR408 through CR411 and CR419 through CR422. C425 equalizes the phase shift through
the upper and lower portions of the amplifier for best high-frequency balance.
The +16 and -16V power supply regulators (Q300 and Q301) supply current to only the amplifier. This
minimizes the effects of the large-current needs of the amplifier on the other circuits and minimizes
distortion.
Overvoltage Protection and Output Circuits (Service Sheet 4)
Between the Floating Output Amplifier and the output connectors are several circuits.
Balun T400 improves the balance of the Floating Output Amplifier a t high frequencies where the
amplifier’s balance has deteriorated.
The 48 dB Attenuator is a 500, pi-section attenuator. C505 compensates the high-frequency effects of
the parasitic capacitance of the contacts of K8.
The Overvoltage Protection Circuits open the relays on the two output lines when a large voltage is
inadvertently applied to an output connector. The circuit thus protects the instrument’s output circuits
(especially the Floating Output Amplifier). Application of a large voltage on the output is sensed (after
attenuation by voltage dividers R490 and R491 and R492 and R493) by comparators U400A through
U400D which are referenced to voltages from the voltage dividers R495 and R497 and R494 and R496.
Both positive and negative references are sensed on both output lines. When a comparator trips, K402A
and K402B are opened via flip-flop U2B and drivers UlOG, U8D and U8E. U2B also turns on Q33
which is read by the controller to generate an error message on the instrument’s display. CR415 through
CR418 protect the comparators. VR31 shifts the comparators’ outputs to a T T L level. C440 and C441
prevent arcing of the contacts of K402 when the relay is deactivating. C64, CR17, CR18, and R122
open K402 at instrument turn-on.
Components C409 through C413 and L402 prevent high-frequency parasitic signals on the high-output
line from radiating from the instrument.
Relay K404A controls the float or ground state of the low-output line.
8-28
Principles of Operation (A3)
Model 8904A
Service
TROUBLESHOOTING
GENERAL
The goal of the following troubleshooting procedures is to isolate the fault to a single, replaceable
assembly. The instrument assemblies are as follows:
0
0
0
0
0
0
0
A1 Keyboard
A2 Digital
A3 Output
A4 Power Supply
A5 Display
A6 High Power Output (Installed only in Option 006)
A10 Output (Installed only in Option 002)
The exploded drawings at the end of section 6 in the manual will assist in locating, disassembling,
and reassembling these assemblies.
The troubleshooting procedures assume the failure is catastrophic. For subtle or slightly-out-ofspecification failures, it is best to begin diagnosis by running the performance tests and adjustments.
To isolate the fault to a printed circuit board assembly, it is usually necessary to check only the signals
on the interface (interconnections) between assemblies. Specifically, this will be the interface between
the A2 Digital Assembly and one of the other assemblies. The A3 (or A10) Output Assembly can be
troubleshot to the component level using the troubleshooting information on the schematic diagrams.
NOTE
If the A 2 Digital Assembly is replaced, it will be necessary to restore the
instrument’s serial number and, where applicable, Option 001 andfor 003 i n
non-volitile memory. The procedures to do this follow the last troubleshooting
procedure.
The the troubleshooting procedures verify the signals in the:
0
0
0
0
0
A2 Digital Assembly to A3 (or A10) Output Assembly Interface
A2 Digital Assembly to A1 Keyboard Assembly Interface
A2 Digital Assembly to A5 Display Assembly Interface
A3 or A10 Output Assembly
A6 High Power Output
Other procedures include:
0
0
How to Restore the Serial Number in a Replacement A2 Digital Assembly
How to Restore Options 001 and 003 in a Replacement A2 Digital Assembly
How to Replace the Memory Backup Battery
NOTE
If the instrument has Option 002, a second output, and the fault appears only
on one output, swap the A3 and A10 assemblies and see if the fault tracks the
output assembly. If it does, then the Output Assembly is at fault; otherwise,
the A2 Digital Assembly (or possibly an interconnection) is at fault.
rev.15DEC89
Troubleshooting (General)
8-29
Service
Model 8904A
A2 DIGITAL ASSEMBLY TO A3 (OR A10) OUTPUT ASSEMBLY INTERFACE
Description
The following procedure will help identify whether an instrument failure is due to the analog output
circuits or their control inputs. Since the layout of the instrument board assemblies breaks the circuit
assemblies along digital-analog lines, this procedure will also help determine which assembly (the A2
Digital Assembly or the A3 (or A10) Output Assembly) is at fault. It does this by checking signals on
the interface between the two assemblies.
If the tests pass but the output is faulty, the A3 (or A10) assembly should be replaced. If the tests fail,
trace the signal to the A2 assembly. Retest the line that was faulty to determine whether the fault is
in A2 or its interconnection to A3. Refer to Table 8-2, A3 and A10 Interconnections to A2, at the end
of this procedure for a cross reference of the signal interconnections.
Equipment
Counter ..........................................................................
H P 5315B
Digital Multimeter ................................................................
H P 3478A
Oscilloscope .....................................................
HP 1740A or Tektronix 2235
Procedure
1. Preliminary Setup
a. If the instrument has Option 002 (a second output assembly, A10) and Output 1 (the output from
the A3 Output Assembly) is to be checked, move the A10 Output Assembly out of the way. (Refer
to Figure 8-11, How to Access A3 in Instruments Equipped with Option 002.)
b. Check that switches 1 and 2 of the Service Switch, S1, on the A2 Digital Assembly are open and
switches 3 through 10 are closed.
NOTE
The reference designators called out in the procedures are for the A3 or
A1 0 Output Assembly.
2. Power Supply Checks
Connect a voltmeter to the points shown in Figure 8-12, Power Supply Testpoints on A3 or AlO.
The readings should be very close to those indicated.
3a. Clock Checks (Using an Oscilloscope)
NOTE
This procedure is adequate for most cases. Step 3b (which uses a counter),
however, is more exact.
a. Connect a dc coupled, high-impedance oscilloscope to pin 3 of U2. The waveform should be a
TTL squarewave with a period of approximately 150 ns (a frequency of 6.7 MHz).
b. Connect the oscilloscope to pin 2 of U2. The waveform should be a TTL squarewave with a period
of approximately 600 ns (a frequency of 1.68 MHz).
8-30
Troubleshooting (Digital/Output Interface)
Model 8904A
Service
Tools:
No. 2 Pozidriv Screwdriver
Needlenose Pliers
PC Board Extractor
(included with Service Manual
or order: HP 08904-00013)
1. Turn instrument off, unplug power cord
and remove bottom cover.
2. Disconnect ribbon cable, W17. from
A1 OJ1
\
3. Remove hold-down screw and washer
from center of A10 Ouput Assembly
using Pozidriv screwdriver.
\
4. Pull A10 from each of its seven
mounting posts. Release each mounting
post by compressing the holding tang
on mounting post with needlenose pliers
while applying gentle upward pressure
with the PC board extractor. (Extractor
should exert pressure on metal shield,
not on PC board, except where post
does not extend through shield.)
\
5. Lift A10 from instrument and carefully
lay A10 aside (coax cables will still be
connected).
\
6. Replace hold-down screw (from step 3)
with spacer (found under A10) into
mounting hole in center of A3. This
screw must be in place during
adjustment procedure for A3.
I
Figure 8-1 1. How to Access A3 in Instruments Equipped with Option 002
Troubleshooting (Digital/Output Interface)
8-3 1
Model 8904A
Service
,
1 1 6 . 3 Vdc
(to J1 P i n 2 8 )
- 1 6 . 3 Vdc
(to J1 P i n 31)
_________-Serial Prefix
2948A and
above o n l y
N o t Opt 006
~
,
~
,
,
,
I
'Opt
006,
+5. lVdc
(to J; P i n 34)
I
-16.3
Vdc
:to
,I:
I
Piis 29 a n d 3 0 )
+ ! t t . 5 Vdc (ts J1 P i n s 26 a n d 2 7 :
Figure 8-12. Power Supply Testpoints on A3 or A10
8-32
Troubleshooting (Digital/Output Interface)
rev.15DEC89
Model 8904A
Service
3b. Clock Checks (Using a Counter)
a. If the counter has an external 10 MHz timebase reference input, connect it to the rear-panel 10
MHz REF OUT of the Multifunction Synthesizer.
NOTE
If the counter does not have an external reference, the readings in the
following steps may be off several counts. This does not indicate a failure.
b. Connect the high-impedance counter input to pin 3 of U2. The counter should read within one
count of 6.71088 MHz.
c. Connect the counter to pin 2 of U2. The counter should read within one count of 1.67772 MHz.
4a. Digital-to-Analog Converter Check (Using an Oscilloscope)
a. On the Multifunction Synthesizer, press SHIFT PRESET. After the instrument presets, key in
For A3 Output Assembly
For A10 Output Assembly
fl (Channel Config.)
fl (Channel Config.)
NEXT
WAVE FORM (t
NEXT NEXT
WAVE FORM (t
FREQ 25.6 Hz
FREQ 25.6 Hz
AMPTD 10 V
AMPTD 10 V
NOTE
Setting the frequency to exactly 25.6 Hz inputs a TTL squarewave to
each input of the DAC latches. As the DAC’s data input lines are probed
from the most significant bit the the least significant bit, the frequency is
consecutively divided by two.
b. Connect a dc coupled, high-impedance oscilloscope to the pin of the IC listed below. The waveform
should be a TTL squarewave with an approximate period as indicated in the table.
IC on A3 or A10
Pin
Period
u5
u5
u5
u5
u5
u5
14
13
11
6
4
3
19.1 ps
38.1 ps
76.3 ps
153 ps
305 ps
610 ps
u4
u4
u4
u4
u4
u4
14
13
11
6
4
3
1.22 ms
2.44 ms
4.88 ms
9.8 ms
19.5 ms
39.1 ms
Troubleshooting (Digital/Output Interface)
8-33
Service
Model 8904A
4b. Digital-to-Analog Converter Check (Using a Counter)
a. If the counter has an external 10 MHz timebase reference input, connect it to the rear-panel 10
MHz REF OUT of the Multifunction Synthesizer.
NOTE
I f the counter does not have a n external reference, the readings in the
following steps may be off several counts. T h i s does not indicate a failure.
b. On the Multifunction Synthesizer, press SHIFT PRESET. After the instrument presets, key in
For A3 Output Assembly
For A10 Output Assembly
fl (Channel Conf ig.)
fl (Channel Conf ig.)
NEXT
WAVE FORM /t
FREQ 25.6 Hz
AMPTD 10 V
NEXT NEXT
WAVE FORM /L
FREQ 25.6 Hz
AMPTD 10 V
NOTE
Setting the frequency to exactly 25.6 Hz inputs a TTL squarewave to
each input of the DAC latches. As the DAC’s data input lines are probed
from the most significant bit the the least significant bit, the frequency is
consecutively divided by two.
c. Connect the high-impedance input of the counter to the pin of the IC listed below. The counter
should read within one count of the frequency indicated in the table.
IC on A3 or A10
Pin
Frequency (Hz)
u5
u5
u5
u5
u5
u5
14
13
6
4
3
52 428.8
26 214.4
13 107.2
6 553.6
3 276.8
1 638.4
14
13
11
6
4
3
819.2
409.6
204.8
102.4
51.2
25.6
u4
u4
u4
u4
u4
u4
8-34
Troubleshooting (Digital/Output Interface)
11
Model 8904A
Service
5. Miscellaneous Control Checks
a. On the Multifunction Synthesizer, press SHIFT PRESET. After the instrument presets, key in
For A3 Output Assembly
For A10 Output Assembly
fl (Channel Config.)
fl (Channel Config.)
NEXT
NEXT NEXT
b. Connect a dc coupled, high-impedance oscilloscope or logic probe to the pin of the IC listed in
the table below. For each connection, key in the sequences listed in the table (in the order listed)
and note the logic state.
~
A3/A10 Connection
Function
Filter
24 dB Attenuator
12 dB Attenuator
6 dB Attenuator
On/Off Switch
48 dB Attenuator
Float/Ground Switch
A3 Key Sequence
A10 Key Sequence
TTL
IC
Pin
fl fl ( F i l t e r S e l e c t )
SHIFT FILTER 2
fl fl ( F i l t e r S e l e c t )
U8
1
AMPTD 1OV
625 rnV
AMPTD 1OV
625 rnV
u10
1
H
1 ov
1 ov
2.5V
u10
3
H
5v
1 ov
1ov
5v
u10
5
H
SHIFT OUTPUT 1 ON
SHIFT OUTPUT 1 OFF
SHIFT OUTPUT 2 ON
SHIFT OUTPUT 2 OFF
U8
6
L
H
H
SHIFT FILTER 1
2.5V
39 rnV
39 rnV
AMPTD 10 V
U8
3
SHIFT FLOAT 1 ON
SHIFT FLOAT 1 OFF
SHIFT FLOAT 2 ON
SHIFT FLOAT 2 OFF
U8
7
AMPTD 1OV
Troubleshooting (Digital/Output Interface)
Level
L
H
L
L
L
L
L
H
-
8-35
Service
Model 8904A
6. Overvoltage Control Checks
a. On the Multifunction Synthesizer, press SHIFT PRESET. After the instrument presets, key in
For A3 Output Assembly
For A10 Output Assembly
SHIFT SERVICE
NEXT NEXT
f3 (Memory Map Access)
NEXT NEXT NEXT NEXT
SHIFT SERVICE
NEXT NEXT
f3 (Memory Map Access)
NEXT NEXT NEXT NEXT NEXT
80
80
b. Connect a dc coupled, high-impedance oscilloscope or logic probe to pin 12 of U2. The voltage
should be a TTL low.
c. Press SHIFT. The voltage should be a TTL high.
NOTE
To repeat this part of the check, key in 80 then SHIFT. A beep will be heard
each time 80 is keyed in.
d. Connect the oscilloscope or logic probe to pin 11 of U2.
e. Key in 80 then SHIFT. As the shift key is pressed, the steady state TTL high should go
momentarily low then back to high. (The logic probe should blink. The trace on an oscilloscope
should blink perceptibly, or if the oscilloscope is in the normal trigger mode, a single sweep should
be triggered.)
f. Press SHIFT PRESET. After the instrument presets, momentarily short pin 10 of U2 to ground.
The instrument should beep and the display should read
For A3:
Reverse Power Relay Tripped on Output 1
Press any key t o r e s e t and continue.
For A10:
I
8-36
Reverse Power Relay Tripped on Output 2
Press anv kev t o r e s e t and continue.
Troubleshooting (Digital/Output Interface)
I
Model 8904A
Service
n b l e 8-2. A3 a n d A10 Interconnections to A2
I
I
Clocks
I
IC
A3
1
I
I
I
Pin
1
I
3
2
J1 and 55
Pin
32
15
I
~~
I
A2
I
1
I I 1
I
IC
I
U105
U105
Pin
I
I
2
I
I
A10
IC
I
u2
u2
10
Pin
3
2
Pin
J1 and J5
Pin
IC
Pin
u5
u5
u5
u5
u5
u5
14
13
11
6
4
3
13
12
11
10
9
8
U37
u37
u37
u37
u37
u37
15
12
10
7
5
2
u5
u5
u5
u5
u5
u5
14
13
11
6
4
3
u4
u4
u4
u4
u4
u4
14
13
11
6
4
3
7
6
5
4
3
2
U33
u33
u33
u33
u33
u33
15
12
10
7
5
2
u4
u4
u4
u4
u4
u4
14
13
11
6
4
3
I
I
1-
Miscellaneous Control
A3
Pin
1
1
3
5
6
3
7
U8
U8
I
I
J1 and J5
22
I
U38
U38
U38
U38
U38
U38
U38
I
1
-
A2
IC
A10
~
Pin
IC
1
I
Pin
I
l2
11
J1 and J5
Pin
17
18
~
I
~~
I
IC
U105
U105
Pin
I
4
12
14
18
13
I
U38
U24
IC
I
19
15
I
1-
I
J1 and J6
Pin
A2
IC
Pin
13
12
11
10
9
8
U34
u34
u34
u34
u34
u34
15
12
10
7
5
2
7
6
U36
U36
U36
U36
U36
U36
15
12
10
7
5
2
5
4
3
2
1
~
A1 0
I
Pin
1
1
3
5
6
3
7
I
J1 and J6
I
A2
Pin
19
u35
u35
Overvoltage Control
J l and J6
Pin
Pin
I I I
I
Pin
Miscellaneous Control
U8
u10
u10
u10
U8
U8
U8
15
A2
IC
t
12
17
16
Overvoltage Control
A3
A2
I
DAC
IC
-
I
J1 and J6
Pin
32
15
DAC
,3
i
Clocks
u2
17
18
I
I
A2
I
11
1 I I
I
IC
u35
U24
1
Pin
19
15
Troubleshooting (Digital/Output Interface)
8-37
Service
Model 8904A
A2 DIGITAL ASSEMBLY TO A1 KEYBOARD ASSEMBLY INTERFACE
Description
The following procedure will help identify whether a keyboard failure is due to the keyboard itself or
the controller. It does this by checking signals on the interface between the two assemblies.
If the tests pass but the instrument does not respond to keyboard inputs, the A2 Digital Assembly
should be replaced. If the tests fail, trace the signal to the A1 Keyboard Assembly. Retest the line that
was faulty to determine whether the fault is in A2 or its interconnection to A l . Refer to Table 8-3, AI
Interconnections to A2, at the end of this procedure for a cross reference of the signal interconnections.
Equipment
Oscilloscope
. . . . . . . . . . . . . . . . . . . .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. . . HP
1740A or Tektronix 2235
Procedure
la. Quick Key Check
NOTE
This check will quickly verify that the keys operate properly. If this check
fails, run the following check to pinpoint the failure.
a. Check that switches 1 and 2 of the Service Switch, S1, on the A2 Digital Assembly are open and
switches 3 through 10 are closed.
b. On the Multifunction Synthesizer, press SHIFT PRESET. After the instrument presets, key in
SHIFT SERVICE
fl (Keyboard Check)
c. Press each key and check that the name of the key which appears in the lower, left hand of the
display agrees with the key pressed.
NOTE
A beep will also be heard after each keypress. Press f4 twice to exit this
mode.
1b. Key Check
a. Check that switches 1 and 2 of the Service Switch, S1, on the A2 Digital Assembly are open and
switches 3 through 10 are closed.
b. On the Multifunction Synthesizer, press SHIFT PRESET. If the instrument does not preset, switch
LINE to OFF and then to ON. If the instrument does not preset, the A2 Digital Assembly or A4
Power Supply is probably faulty.
c. After the instrument presets, connect a dc coupled, high-impedance oscilloscope or a logic probe
to the points listed in the following table and press the keys indicated. When a key is pressed the
logic level should respond as shown in the table only for the keys in that group.
8-38
Troubleshooting (DigitaVKeyboard Interface)
Model 8904A
Service
NOTE
Ignore the beeper and the display as keys are pressed. If p i n 8 o n A2U4 is
always high, a key is probably stuck down.
IC on A2
Pin
u3
17
fl, f2, SHIFT, 7, 2
All other keys
Goes Low
Always High
u3
15
NEXT, LAST, LOCAL, -, 3, 9
All other keys
Goes Low
Always High
u3
13
f3, f4, e = ,kHz V, deg pV
All other keys
Goes Low
Always High
u3
11
FREQ, PHASE, 0 , 5 ,0
All other keys
Goes Low
Always High
u3
a
0 , AMPTD, WAVE FORM, 6,.
All other keys
Goes Low
Always High
u3
6
INCR SET, 1,4, Hz rnV, rad ENTER
All other keys
Goes Low
Always High
ut
12
fl, NEXT, f3, FREQ, AMPTD, 1
All other keys
Always Low
Always High
u1
13
All keys
Blinks High
u1
14
All keys
Blinks High
u1
15
All keys
Blinks High
u1
16
All keys
Blinks High
u1
17
All keys
Blinks High
Key Pressed
Response (lTL)
2. FLOAT and ON Annunciators Check
On t h e Multifunction Synthesizer, press SHIFT PRESET. After the instrument presets, key in
the sequence indicated listed in the following table. The front-panel annunciators should light as
indicated in the table. I f the annunciators light improperly, also check t h e logic level at t h e p o i n t
indicated.
NOTE
If the instrument does not have Option 002 (a second output), omit the tests
for FLOAT 2 and ON 2.
Troubleshooting (Digital/Keyboard Interface)
8-39
Service
Model 8904A
Key Sequence
Annunciator
Status
IC on A2
Pin
Level ( l T L )
(None)
SHIFT FLOAT 1 OFF
FLOAT 1
On
Off
U38
13
L
H
(None)
SHIFT FLOAT 2 OFF
FLOAT 2
On
Off
u35
13
L
H
(None)
SHIFT OUTPUT 1 OFF
ON 1
On
Off
u2
16
(None)
SHIFT OUTPUT 2 OFF
ON 2
On
Off
u2
17
L
H
L
H
3. HP-IB Annunciators Check
a. On the Multifunction Synthesizer, press SHIFT PRESET. After the instrument presets, key in
SHIFT SERVICE
NEXT NEXT
f3
(Memory Map Access)
NEXT NEXT
The four front-panel, HP-IB annunciators (RMT, LSTN, TALK, and SRQ) should be on. (Pins
15, 14, 13, and 12, respectively, of U2 should all be TTL low.)
b. Key in 0 F. The HP-IB annunciators should be off. (Pins 15,14, 13, and 12 of U2 should be high.)
Note: J1 is the 22 pin connector on the front right edge of A2. Pin 1 is nearest the center of the
board. The +5V supply is on pins 1 and 2 of J1.
8-40
Troubleshooting (Digital/Keyboard Interface)
Model 8904A
Service
A2 DIGITAL ASSEMBLY TO A5 DISPLAY ASSEMBLY INTERFACE
Description
A failure in the A5 Display Assembly can cause the entire instrument to hang up at power up. If this
condition is suspected, measure pin 12 of A2U25 or pin 4 of A2U20 with a high impedance, dc coupled
oscilloscope. TTL pulses should be seen with 1 ps high and 15 ps low. (The signal is normally a TTL
high.)
To check the backlighting, measure the connection of the red wire at A2J8 with a high impedance, dc
coupled oscilloscope. (A2J8 is located in the extreme front, right side of A2.) An ac waveform of 80 to
300 Vpp should be observed. The period should be approximately 2 ms. The amplitude will vary with
brightness of the display and is adjustable. (See Adjustment 5, Display Backlighting and Contrast in
Section 5 of the Operation and Calibration Manual. Display contrast is also adjustable.)
Note that high voltages are measured.
A no load or short on the backlighting oscillator of A2 will damage the drive
circuit.
NOTE
The display backlighting automatically turns off approximately 3 minutes
after the last keystroke. Pressing any key will turn the backlighting back on.
Troubleshooting (DigitalDisplay Interface)
8-41
Service
Model 8904A
A3 OR A10 OUTPUT ASSEMBLY
Description
The following procedure will assist in locating a fault on the A3 or A10 Output Assembly. It is wise
to perform the procedure titled A2 Digital Assembly to A3 (or A10) Output Assembly Interface first to
confirm that the fault is indeed on the Output Assembly.
NOTE
I f the instrument has Option 002, a second output, and the fault appears
only o n one output, swap the A3 and A10 assemblies and see if the fault
tracks the output assembly. I f it does, then the Output Assembly is at fault;
otherwise, the A 2 Digital Assembly (or possibly an interconnection) is at
fault.
Equipment
Oscilloscope
. .. . . . . . . ... . . . .... . . .. . . . . . . . .. . . . . . .. . . . . . .. . . . .. . . HP 1740A or Tektronix 2235
Procedure
1. If the A3 Output Assembly is to be checked and the instrument also has an A10 Output Assembly
(Option 002) present, move the A10 assembly out of the way by following the procedure of Figure
8-11, How to Access A3 in Instruments Equipped with Option 002.
2. To troubleshoot the Output Assembly,
a. Turn to the schematic diagram (Service Sheets 1 through 4) of the circuit that is suspect.
b. Set the instrument as instructed in the boxed text entitled “INITIAL INSTRUMENT
SETTINGS”.
c. Connect the oscilloscope to the point to be tested.
d. Alter the instrument settings if instructed by the troubleshooting text for that testpoint,
and make the measurement.
8-42
Troubleshooting (A3 or A10 Assembly)
Model 8904A
Service
PHASE SYNCHRONIZATION (OPTION 005)
Description
The operation of the unit-to-unit phase synchronization circuits (Option 005 and serial prefix
beginning 2948A only) is checked by monitoring the signals on the rear-panel clock synchronization
and phase reset input and output lines. The checks should pinpoint the failure to either the A2 Digital
Assembly or an interconnecting cable. Marginal failures may be able to be corrected by performing
the Phase Synchronization Adjustment in Section 5; however, this is recommended only when there
is strong reason to suspect that the failure is due to slight timing errors. Performance of the phase
synchronization circuits can be verified by running the Unit-to-Unit Phase Accuracy Performance Test
in Section 4.
Equipment
Digital Multimeter ................................................................
H P 3478A
H P 1740A or Tektronix 2235
Oscilloscope .....................................................
Procedure
1. On the Multifunction Synthesizer, connect the rear-panel CLOCK SYNC OUTPUT to the
oscilloscope input. Set the oscilloscope’s input to 500 or terminate the input in 50R using a tee.
2. On the Multifunction Synthesizer, press SHIFT PRESET. After the instrument presets, key in
SHIFT SPECIAL 7 ENTER
f2 (Status) ON
LAST
f2 (Status) ON
3. The oscilloscope should show a TTL waveform with a period of 74.5 ns (a frequency of 13.4
MHz). If faulty, check the cable which terminates at A2J9.
4. Connect the oscilloscope to A2TP1. (The oscilloscope input should remain at 50R.) Connect a
short BNC cable between the rear-panel CLOCK SYNC OUTPUT and CLOCK SYNC INPUT.
5. The oscilloscope display should be the same as in step 3. If faulty, check the cable which
terminates at A2J10.
6 . Connect the oscilloscope input or a logic probe to the rear-panel 9 RESET OUTPUT. If an
oscilloscope is used, set it to single trigger. On the Multifunction Synthesizer, press f4 (Exit).
7. Key in SHIFT iP RESET several times and observe the oscilloscope or the logic probe. The logic
probe should blink a high each time. The oscilloscope should trigger a sweep each time. (It may
be necessary to adjust the oscilloscope’s trigger level and the trigger may need to be armed each
time.) If faulty, check the cable which terminates at A2Jll.
8. Connect a short BNC cable between the rear-panel Q, RESET OUTPUT and @ RESET INPUT.
Connect the oscilloscope input or a logic probe to A2U30 pin 12.
9. Key in SHIFT iP RESET several times, as was done in step 6 , and observe the oscilloscope or
the logic probe. The logic probe should blink a high each time. The oscilloscope should trigger a
sweep each time. If faulty, check the cable which terminates at A2J12.
rev.15DEC89
Troubleshooting (Phase Synchronization)
8-42.1
Model 8904A
Service
HOW TO RESTORE THE SERIAL NUMBER
IN A REPLACEMENT A2 DIGITAL ASSEMBLY
Description
If the A2 Digital Assembly has been replaced by a new or exchange assem,,;, the instrument’s serial
number suffix will need to be entered into non-volatile memory (RAM). The suffix is the last five
digits of the serial number. For example, the suffix of serial number 1234A56789 is 56789.
The serial suffix can be entered from the front-panel keyboard by the following procedure. Note,
however, that the procedure will only work for an assembly coming from a Hewlett-Packard sales office
or service center. If the instrument has lost the contents of its non-volatile memory (for example, if
the backup battery fails), the serial number cannot be entered; the A2 Digital Assembly must first be
replaced, then the serial number can b e entered.
The procedure is written with simple steps followed by detailed notes. Normally, it is only necessary to
follow the simple steps and ignore the notes. Refer to the notes when a step doesn’t work quite right.
NOTE
If the instrument htls Option 001, 003, and/or 005, these options can be
restored after restoring the serial number. Refer to the procedure following
this one.
Procedure
1. Switch LINE to OFF and then back to ON. After the instrument powers up, the display should
read
I
*
HP 8904A Main Selection Level
f l Channel Confia.
*I
NOTE
After about 3 minutes if no key has been pressed, the backlighting on
the display will go off. This is normal. When another key is pressed the
backlighting will go back on.
2. Press SHIFT PRESET. The display will look something like the following, then after about 3
seconds it will time out. (The example shows an instrument with Option 002 installed.) Check
that the serial suffix is 00000.
HP 8904A Opts 02
Firmware Revision 18387A S e r i a l No 00000
rev. 15DEC89
Troubleshooting (Serial Numbers)
8-43
Service
Model 8904A
NOTE
a. T h e SHIFT key is the blue key. The PRESET key is labeled in blue
above the *= key.
b. A f t e r 3 seconds the display will time out and read as in step 1. Press
SHIFT PRESET as often as needed to view the option and serial
display.
C.
T h e displayed option numbers are only two digits (for example, 01)
even though the officialoption numbers are three digits (for example,
001).
d. I f the serial suffix is not 00000 but agrees with the suffix of the serial
number on the rear panel, the instrument already has its serial suffix
correctly entered.
3. Key in SHIFT SPECIAL 8 7 ENTER SHIFT END. The display should read
***** S e r i a l Number I n s t a l l a t i o n
Enter 5 d i g i t s e r i a l number. S/N=
*****
NOTE
a. The SPECIAL key is labeled in blue above the LAST key. The END key
is labeled in blue above the ENTER key.
b. After keying in SHIFT SPECIAL, the display should be:
I
f l S p e c i a l # 0 f 2 S t a t u s = Off f 4 Exit
# 0 Last s t a t e r e c a l l e d on Dower UD
I
c. After keying in 8 7, the display should be:
f l S p e c i a l #87 f 2 S t a t u s = Off f 4 Exit
# 0 Last s t a t e r e c a l l e d on power up
d. A f t e r keying in ENTER, the instrument will beep.
e. After keying in SHIFT END, if the display is as follows, the instrument
serial number cannot be entered. The A2 Digital Assembly must be
replaced.
1
8-44
*****
S e r i a l Number I n s t a l l a t i o n
S e r i a l number cannot be i n s t a l l e d .
Troubleshooting (Serial Numbers)
*****
I
Model 8904A
Service
4. Key in the serial suffix which is printed on the rear-panel serial label, then press ENTER. (For
example, if the serial number on the label is 1234A56789, key in 5 6 7 8 9, then press ENTER.)
The display should now read:
I
Press SHIFT f 2 t o i n s t a l l S/N = 56789.
If S/N i s wrong use f 3 Reenter f 4 Exit.
I
The serial suffixthat you keyed in should appear a t the end of the top line. (In the example shown
it is 56789.)
NOTE
I f a typing error occurs as the serial suffix is being entered, the backspace
(*=)key can be used to back up to the digit i n error.
5. If the serial suffix is correct, press SHIFT f2.If the serial suffix is incorrect, press f3 and key in
the correct number.
T h i s is your last opportunity to check the serial suffix before it is entered
permanently into the instrument. I t cannot be changed once it has been
entered.
The display should now read something like the following. (The example shows serial suffix 56789.)
I *****
Serial Number I n s t a l l a t i o n *****
S e r i a l Number S/N = 56789 i n s t a l l e d .
After the 10 second timeout the display will read
I*
HP 8904A Main Selection Level
f l Channel Confin.
*I
6. Press SHIFT PRESET. Confirm that the serial suffix has been invoked. The display will look
something like the following. (The example shows serial suffix 56789.)
I
HP 8904A Opts 02
Firmware Revision 18387A Serial No 56789
I
7. If the instrument has Options 001 and/or 003, these options can be restored after restoring the
serial number. Refer to the procedure following this one.
Troubleshooting (Serial Numbers)
8-45
Service
Model 8904A
HOW TO RESTORE OPTIONS 001,003, AND 005
IN A REPLACEMENT A2 DIGITAL ASSEMBLY
Description
If the A2 Digital Assembly has been replaced by a new or exchange assembly, the instrument’s serial
number suffix will need to be entered into non-volatile memory (RAM). (Restoration of the serial
number is documented in the previous procedure.) After the serial number has been restored, Options
001, 003, and 005 can, where applicable, be restored.
The procedure requires entering of an option Codeword which is unique to the serial number and
option number. The Codeword is printed on a label inside the instrument.
The procedure is written with simple steps followed by detailed notes. Normally, it is only necessary to
follow the simple steps and ignore the notes. Refer to the notes when a step doesn’t work quite right.
Procedure
1. Switch LINE to OFF and then back to ON. After the instrument powers up, the display should
read
* HP 8904A Main Selection Level
fl Channel Config.
*
2. Press SHIFT PRESET. Check that the serial suffix matches the number on the rear panel and
check that the option being restored is not already present. The display will look something like
the following then after about 3 seconds it will time out. (The example shows an instrument
with serial suffix 12345 with Options 002 and 001 installed.)
I
HP 8904A Opts 02/01
Firmware Revision 18387A S e r i a l No 12345
I
NOTE
a. The SHIFT key is the blue key. The PRESET key is labeled i n blue above
the C. key.
b. After 3 seconds the display will time out and read as i n step 1. Press
SHIFT PRESET as often as needed to view the option and serial display.
suffixis 00000, the instrument will need its serial number
entered. Refer to How to Restore the Serial Number in a Replacement
A2 Assembly.
c. I f the serial
d. The displayed option numbers are only two digits (for example, 01) even
though the official option numbers are three digits (for example, 001).
e. The presence of options other than the one being retrofit doesn’t ’matter.
8-46
Troubleshooting (Options 001, 003, and 005)
Model 8904A
Service
3. Key in SHIFT SPECIAL 4 8 ENTER SHIFT END. The display should read
I ****
Option Firmware I n s t a l l a t i o n ****
Enter i n s t a l l a t i o n code:
f4 Exit
I
NOTE
a. The SPECIAL key is labeled in blue above the LAST key. The END key
is labeled in blue above the ENTER key.
b. After keying in SHIFT SPECIAL, the display should be:
fl Special # 0 f2 S t a t u s = Off f4 E x i t
# 0 Last s t a t e r e c a l l e d on power up
c. After keying in 4 8, the display should be:
fl Special #48 f2 S t a t u s = Off f4 Exit
# 0 Last s t a t e r e c a l l e d on power up
d. After keying in ENTER, the instrument will beep.
e. If after keying in SHIFT END, if the display is:
**** Option Firmware I n s t a l l a t i o n ****
Option i n s t a l l a t i o n not performable.
the instrument will need its serial number entered or it is in need of
repair. Refer to How to Restore the Serial Number in a Replacement
A2 Assembly.
4. Locate the Codeword label for the option being restored. The Codeword label is located on the
right side of the chassis toward the rear of the instrument.
5 . Key in the Codeword then press ENTER. Check the options from the display. The display will
look something like following then after about 10 seconds it will time out. (The example shows
Option 003 now installed.)
The p r e s e n t l y i n s t a l l e d o p t i o n s a r e :
HP 8904A Opts 02/01/03
After the 10 second timeout, if the Codeword entry has been successful, the display will read
**** Option Firmware I n s t a l l a t i o n ****
Turn off LINE power t o invoke o p t i o n s ! !
Troubleshooting (Options 001 and 003)
8-47
Model 8904A
Service
NOTE
a. If a typing error occurs as the Codeword is being entered, the backspace
(em) key can be used to back up to the digit i n error.
b. If the Codeword is incorrect the display will not list the desired option
and after the 10 second timeout, the display will read:
*
HP 8904A Main Selection Level
fl Channel Config.
*
Begin again at step 3.
6. Switch LINE to OFF and then back to ON. After the instrument powers up, the display should
again read
*
HP 89046 Main Selection Level
fl Channel Config.
*
7. Press SHIFT PRESET. Confirm that the option has been restored. The display will look something
like following. (The example shows that Option 003 has been installed.)
I HP
8904A Opts 02/01/03
Firmware Revision 18387A Serial No 12345
1
I
8. If another option is to be restored in the same instrument, start again at step 3.
8-48
Troubleshooting (Options 001 and 003)
Model 890412
Service
HOW TO REPLACE THE MEMORY BACKUP BATTERY
Description
The battery that backs up non-volatile memory has a limited lifetime. It should be replaced
every five years or whenever it shows signs of deterioration. Replacing the battery must be done
carefully so as to not interrupt the contents of the RAM. If the RAM looses its contents, the entire A2
Digital Assembly will have to be replaced because its serial number and option information will be
lost.
Replacing the backup battery consists of unplugging and freeing the A2 Digital Assembly, wiring a
power supply and resistor to RAM power supply pin, removing the old battery and soldering in the
new one, removing the power supply backup, and re-assembling the instrument.
The normal precautions against electrostatic discharge must be followed but
do not place the A 2 Digital Control Assembly on a conductive metal
surface, which could short the battery or the RAM power supply pin.
The substitute power supply must be floating if the solder iron has a grounded
tip. (All soldering is done with the HP8904A completely disconnected from
the power line.)
Do not apply too much heat to printed circuit connections when soldering.
The traces on the multilayer board are easily damaged.
Do not overstress the interconnecting cables.
Tools and Supplies
Desoldering Tool
Needle Nose Pliers
Power Supply (Floating) or 3V Battery
Resistor, 10 kR
Solder Iron
Torx Driver
Parts
If the instrument has serial prefix 2942A and below order a 2.8V battery (HP 1420-0281)and three
insulators (HP 3050-0990). If the instrument has serial prefix 2942A and above order a 2.8V battery
(HP 1420-0338).
Procedure
1. Switch LINE to OFF and disconnect the power cord.
2. Remove the instrument’s top cover. The cover may be tightly secured in the groove of the bottom
cover. If the top cover does not pull off easily after backing out the screw on the rear edge, back
out the screw on the rear edge of the bottom cover also.
rev.15DEC89
Troubleshooting (Memory Backup Battery)
8-48.1
Service
Model 8904A
3. Partially remove the A2 Digital Assembly as follows. (figure 6-1, Main Deck Assembly-Top,
be helpful.)
may
a. Unplug all connectors on the A2 assembly except the two soldered-in coaxial cables. (To
remove the front-most keyboard ribbon cable, lift up on its retainer and push the retainer
forward.)
b. Remove the single Torx screw securing the A2 assembly.
c. Carefully lift the A2 assembly from the seven plastic holding posts by compressing the
small holding tangs with needle-nose pliers, and pulling the board up until the printed
circuit board is free from the posts. Carefully rotate the board upward (hinging it from the
left side as you face the front panel) until it is vertical. This should allow access to both
sides of the assembly.
=
*5Y(F2>
I
-
BATTERY BACKUP RAM 1
1
TO EXTERNAL
POWER SUPPLY
1901-88BB
4;
P
13
R25
1.96K
+sv (F2 >
8
I
~~~
'l"
128
1
,L
6.81K
I
1+.7K
Figure 8-12.1 Partial Schematic of A2 Digital Assembly Showing the Battery Backup
4. Refer to Figures 8-12.1 and 8-12.3 for serial prefix 2942A and below or 8-12.4 for serial prefix
2948A and above. Rig up a temporary backup supply as follows.
a. Temporarily solder one lead of a 10 kR resistor to the lead on the
A2C5. (Solder on the component side of the printed circuit board.)
"+', end of
capacitor
b. If a power supply is used (instead of a second battery), set it to approximately 3V then
switch it completely off. Do not simply turn its voltage down to OV, or the 10 kR resistor
will load down the backup.
c . Solder the other lead of the resistor to the "+" output of the power supply (or the temporary
backup battery).
d. Solder the "-"output of the power supply (or battery) to the other lead of A2C5.
8-48.2
Troubleshooting (Memory Backup Battery)
rev.15DEC89
Model 8904A
Service
5. Desolder the three leads of the backup battery (A2B1) with a solder removal tool and remove
the battery.
6a. If the instrument has serial prefix 2942A and below, put the three insulators (HP 3050-0990) on
the leads of the new battery (A2B1, HP 1420-0281) and solder in the battery. The bottom of the
battery case must not touch the circuit board or any solder pads.
6b. If the instrument has serial prefix 2948A and above, solder in the battery (A2B1, HP 1420-0338).
7. Remove the resistor and temporary backup connections on the A2 assembly.
8. Re-install the A2 assembly and all connectors.
9. Place the instrument in its normal operating position. Re-insert the power cord and switch LINE
to ON.
10. Press SHIFT PRESET. The display should show the correct instrument serial number suffix for
a few seconds.
11. Re-install the instrument’s top cover.
rev.15DEC89
Troubleshooting (Memory Backup Battery)
8-48.3
2
c
Model 8904A
Service
w
i
m-
l
i
n
a-
n
-
R A M U14
Capacitor
cs
Battery B 1
Figure 8-12.3. Component Locator for A2 Digital Assembly Detailing the Battery Backup
(Serial Prefix 2948A and Above)
reu.15DEC89
Troubleshooting (Memory Backup Battery)
8-48.5
Service
Model 8904A
LINE VOLTAGES
LINE
1 15VAC-25%. + 1E A
F- 1
s-1
NEUTRAL
23EVAC-15%.+10%
48-6bHZ
W-18
ASSEMBLY
P-4
*PART
OF W-12
Figure 8-12.4. Line Voltage Wiring Harness
8-48.6
Troubleshooting (Memory Backup Battery)
rev.15DEC89
COMP
-
C
I
1
F i g u r e 8-13.
Service Sheet Information
IPI
I
\
I
TP5
B
TPB
I
I
I
TPU3
C
F
c2
c3
c4
c5
B,1
C6
c.1
C8
1 c,2
8.2
c10
c11
8,3
c12
c,3
C13
8,3
C14
8.3
C28
A.2
c29
A.1
C30
A,2
C31
A2
C32
A2
c33
A.2
c34
A2
c35
A.2
C36
A.2
c37
A.2
C38
A2
C40
A2
C41
A,3
C42
A.3
c43
A,3
c44
A.3
c45
A3
C46
A3
c47
A,3
C46
A.3
C50
A.3
C51
8.2
C64
B,1
C71
A.3
C72
A.3
c79
8.1
C82
8.1
c90
A3
c93
A2
c201
A.1
c202
A,1
C203
A.l
C204
A.1
C205
A.1
1P.a
I
0
Model 8904A
Service
A3 Component Coordinates (1 of 2)
-.
C206
C207
C208
C209
C210
C211
C212
C213
C214
C215
C216
C217
C218
C219
C220
C221
C222
C224
C225
C226
C227
C228
C229
C230
C232
C300
C301
C302
C303
C304
C401
C402
C403
C404
C405
C406
C407
C408
C409
C410
C411
C412
C413
C421
C422
8.1
6.1
A.l
B,1
8.1
8.1
A.l
A.l
A.l
A.1
A,1
A.l
A.l
A.1
A.1
8.1
8.1
A.l
A.1
A.l
A.2
8.2
8.2
A.2
8.2
8.2
8.2
A.3
A.3
A3
8.3
8.3
8.3
8.3
D.2
C.2
C.3
C.3
D.2
D.2
D.2
0.2
D.2
D.2
D,2
C423
C424
C425
C426
C431
C432
c433
c434
c435
C436
c437
C438
C440
C441
C442
c443
c444
c445
C446
c447
C446
C500
C501
C502
C503
C504
c505
CR6
CR7
CR8
CR9
CR17
CR18
CR26
CR27
CR202
CR203
CR204
CR205
CR207
CR209
CR210
CR211
CR21:
X,Y
COMP
x,y
K11
K401
K402
K404
A,2
8,3
C.2
D,2
L1
L2
L3
L4
L5
L6
L7
L8
L9
L10
L11
LIZ
L201
L401
L402
D.1
8.2
(1402
(1403
(1404
(1405
0406
0407
0408
D.2
D,3
D.3
D.2
D.2
0.3
D,3
X,Y
c.3
c.3
c.3
c.3
D,2
D,2
D,2
D,2
D,3
D.3
D,3
D.3
c.1
c.2
c.2
c.3
0.2
D,2
D,3
D.3
D.1
c.2
8.3
8.2
I
A3 Component Coordinates (2 of 2)
B.3
c.2
CR300 C,2
CR301 B,2
CR404 D.2
CR405 D.2
CR406 D.3
CR407 C.3
CR408 C.3
CR409 C.3
CR410 C,2
CR411 C,2
CR415 8,2
CR416 8.2
CR417 8.2
CR418 8.2
CR419 C,2
CR420 D,2
CR421 C.3
CR422 D.3
CR423 0.2
CR424 D.2
CR425 D.3
CR426 D.3
~ ~ 4 2 c.2
7
CR428 D,2
~ ~ 4 2 c.3
9
J1
J3
J4
J5
J6
J7
J201
J400
J~OI
D,2
A.2
A,1
A.2
A,Z
A,2
A.1
0.2
D.Z
K1
K2
K3
K4
K5
K6
8.2
A.2
8.3
A.3
8.3
A3
a1
a2
014
a15
0 17
018
019
azo
021
a33
0201
a202
(2203
a204
0205
0206
0207
a206
0209
0210
0300
c.2
8.3
C.3
A2
A,2
A2
A.2
A.2
A.2
A.2
8,l
8,3
D,2
8.3
A.3
8.3
A3
A,3
A3
A,3
A3
A.3
A.3
B,1
A,1
A,1
B,1
8.1
8.1
8.1
8.1
A.l
A.1
A,l
C.2
B,2
D,2
R1
R2
R3
R4
R5
R9
RIO
R40
R41
R42
R43
R44
R45
R47
R49
R48
R50
R51
R52
R53
R54
R55
R56
R57
R58
R59
R60
R61
R62
R63
R64
R65
R66
R67
R68
R69
R70
D,1
8.1
B,1
8.1
8.1
8.1
8.1
A,1
A2
A,2
A2
A2
A.2
A2
A3
A3
A.2
A.3
A3
A3
A2
A2
A3
A,3
A.3
A3
A3
A3
A3
A3
A.3
A3
A3
A.3
A3
A.3
A2
R71
R72
R73
R74
R75
R76
R77
R78
R112
R113
R114
R122
R123
R125
R126
R136
R139
R141
R142
R201
R202
R203
R204
8.2
A,.?
A,3
8.3
8.3
A,3
8.3
A3
C,2
C,2
C,1
8.1
8.1
A3
A3
A3
A3
8.1
A.2
A.l
A.l
A.l
A.l
R206
R207
R208
R209
R210
R211
R212
R213
R216
R217
R218
R219
R220
R221
R222
R223
R224
R225
R226
R227
R228
R229
R230
R232
R233
R300
R301
R400
R401
R402
R404
R405
R406
R407
R408
R409
R410
R411
R412
R413
R414
R415
R416
R417
R418
R419
A.1
8.1
8.1
8.1
A.l
A.1
A.1
A.l
A.l
A.l
A.1
A.1
A.l
All
A,2
A2
A.1
8,1
8.1
A.1
A2
A,2
A.2
A.l
A3
8.2
8.2
D,2
D.3
D.3
D.2
D,2
D.2
D.2
0.3
D.3
D.3
D.3
8.3
83
8.3
8.3
8.3
8.3
8.3
8.3
R421
R422
R423
R424
R446
R447
R448
R449
R452
R453
R454
R455
R456
R457
R458
R459
R460
R461
R466
R467
R468
R469
R470
8.3
R490
8.3
C.3
C.3
R492
R491
R493
C,2
C.3
R495
R494
R496
R497
R499
C.3
C.3
C.2
0.2
T400
T1
C,2
C.2
c,2
‘2.3
‘2.3
C.3
C.3
C,3
D.2
D2
TPI
TP2
TP3
TP4
TP5
TP6
TP7
C.3
C.2
TP402
TP8
TP403
8.2
8.2
8.2
8.2
8,2
8,2
U4
U5
U6
LIB
U9
U10
B,1
8.1
8.1
8,l
A.3
8,l
B,2
8,2
A.l
8,l
A.l
A.l
C,2
C.3
A,1
8.1
A,2
A,3
U201
V
I8
U202
U203
U401
U402
U403
U404
U408
VR19
B,1
A.1
A,3
8.2
C.3
C,2
VR201
VR31
VR206
VR208
VR401
VR402
A.l
8.2
8,l
A,1
8,3
C.3
D,2
A.l
C,2
8.3
NOTES:
1
UNUSED CIRCUITRY
2
I N I T I A L INSTRUMENT SETTINGS
VOLTAGES ON THIS SCHEMATIC UNLESS OTHERWISE
NOTED. SHOULD BE MEASURED AFTER KEYING IN:;
NOTE: U201 IS A O l O D E ARRAY
CONTAINING S I X COMPONENTS.
-
Component L o c a t o r
8-50
FOR A3:
FOR A10:
SHIFT PRESET
SHIFT FLOAT 1 OFF
f l (CHANNEL CONFIG.)
NEXT
AMPTD 10 V
SHIFT PRESET
SHIFT FLOAT 2 OFF
fl (CHANNEL CONFIG.)
NEXT NEXT
AMPTD 10 V
B,3
8,3
B,2
r
D I G I T A L DATA INPUT
DATA LATCHES 7
c3
' T C
8.81U
DIGITAL TO ANALOG CONVERTER
7CLOCK
7
TRACK AND HOLD C I R C U I T
SAMPLER DRIVE
.-$..
a
/
SYNC,-
I
CR2E2
A -
IPOWER SUPPLY CONDITIONERS
-
I
0311
<V-d.,
51.1
I
f
-
\
I
a
M E R AWLIFIER
b----
0318
f55L
~
t7
-1bVDClF)
IFILTEREDI
618 nS
4
ss2
,/
1.w
I
< + i . 8 8 18.02 Vdo)
I
I
-
I
C222
1.1IU
it-
R225
3.16K
*12VOC
-1SVDC
-
cR293
'Y
-1ZVDC
+l5iDC
GUARD
TRACE
L81U
\
I
A
nZl
t
i 1 m
MW
R211
758.1
I
SAMPLER AMPLIFIER \-
G
+16VOCIF)
+1svoc
1 1-
SAMPLER SWITCH
*15MC
(FILTERED)
V
/
-1
i
-
-
J? A
DAC
LEVEL
RZ16
5I.lK
I
r - - - I
I
I
R217
I51.1K
I I i1SVDC
I
I
I
I m11
I
I
I
I
I
- - - e19
5l.lK
C213
-15VDC
l0nA CURRENT SOURCE
ss 1
8-5 1
Model 8904A
Serv i ce
A3 Component Coordinates (2 of 2)
A3 Component Coordinates (1 of 2)
Tpl
A
Flgure 8-14.
Service Sheet Information
t
I
TPI
I
f
COMP
lP2
c
B
I
\
1PS
B
IPB
I
I
TPW
Component Locator
I
0
I
X,V
C2
D.1
c4
3
C5
C6
C8
c10
C11
c12
C13
C14
C28
C29
C30
C31
c.1
B.l
C.1
8.2
c.2
B,3
c,3
B,3
8.3
A.2
A.1
A.2
A2
C33
C32
C34
C35
?A
.,
A2
A.2
C36
C37
C38
C40
C41
C42
C43
C44
C45
C46
A.2
A,2
A.2
A.3
A.3
A.3
A.3
A.3
A3
C47
C48
C50
C51
A.3
A.3
8.2
C64
C71
C72
A,3
B.l
c79
C82
C90
C93
C201
B.1
8.1
A3
A.2
A.l
C202
C203
C204
C205
A.l
A.1
A.l
A,l
A.3
COMP
X,Y
COMP
X,Y
COMP
X,Y
C206
C207
C208
C209
c210
C211
C212
C213
C214
C215
C216
C217
C218
C219
C220
C221
c222
C224
C225
C226
C227
C228
C229
C230
C232
C300
C301
C302
C303
C304
C401
C402
C403
C404
C405
C406
C407
C408
C409
B.1
B,l
A.l
B,1
8.1
8.1
A,l
A.1
A,l
A.l
A.l
A.l
A.l
A.l
A.l
B,1
8.1
A.1
A.1
A.1
A.2
8.2
C423
C424
C425
C426
C431
C432
C433
C434
C435
C436
C437
C438
C440
C441
C442
C443
C444
C445
C446
C447
C448
C500
C501
C502
C503
C504
C505
C.3
C,3
C,3
C.3
D.2
0.2
D.2
0.2
D.3
D.3
D,3
D.3
C,l
C.2
C.2
C.3
D.2
D.2
CR300
CR301
CR404
CR405
CR406
CR407
CR408
CR409
CR410
CR411
CR415
CR416
CR417
CR418
CR419
CR420
CR421
CR422
CR423
CR424
CR425
CR426
CR427
CR428
CR429
CR430
C.2
8.2
D,2
D.2
D.3
C.3
C.3
C.3
C,2
C,2
8.2
8.2
8.2
8.2
C.2
D.2
C.3
D.3
D.2
D.2
D.3
D.3
C.2
D,2
C.3
D,3
CR6
CR7
CR8
CR9
CR17
CR18
CR26
CR27
CR202
CR203
CR204
8.3
C.3
A.3
A.3
B.l
B.1
D.l
D.1
A.l
A.l
A.1
J1
J3
J4
J5
J6
J7
J201
J400
J401
A.2
A.l
A.2
A.2
A.2
A.1
D.2
D.2
8.2
A.2
8.2
8.2
8.2
A.3
A.3
A,3
B.3
8.3
8.3
8.3
D.2
C.2
C.3
C.3
D.2
D.3
D.3
D.1
C,2
8.3
8.2
8.3
8.3
C.2
K1
K2
D,2
8.2
COMP
X,Y
COMP
X,Y
K11
K401
K402
K404
A,2
8.3
C,2
D,Z
D.2
D.3
D.3
D.Z
D,Z
L1
L2
L3
L4
L5
L6
L7
L8
L9
LIO
L11
L12
L201
L401
L402
D,1
Q402
(3403
Q404
a405
a406
a407
a408
01
02
014
015
a16
a17
018
019
020
021
033
0201
0202
azo3
0204
0205
a206
0207
B,Z
c,2
B,3
C.3
A2
A.2
A2
A2
A2
A,2
A2
8.1
8.3
D.2
B,3
B,3
A.3
A.3
A.3
A.3
A.3
A.3
A,3
A,3
8.1
A,1
A.l
8.1
8.1
B.1
B.l
B.l
A,1
A.1
A.l
C.2
8.2
D,2
R1
R2
R3
R4
R5
R9
R10
R40
R41
R42
R43
R44
R45
R47
R48
R49
R50
R51
R52
R53
R54
R55
R56
R57
R58
R59
R60
R61
R62
R63
R64
R65
R66
R67
R68
R69
R70
R71
R72
R73
R74
R75
R76
R77
R78
R112
R113
R114
R122
R123
R125
R126
R136
R139
R141
R142
R201
R202
R203
R204
~ , 3
~ . 3
D,1
B,I
8.1
8.1
8.1
8.1
B.l
A.l
A.2
A,2
A,2
A2
A2
A.2
A.3
A.3
A.2
A.3
A3
A,3
A.2
A.2
A.3
A,3
A,3
A,3
A,3
A.3
A,3
A3
A.3
A.3
A3
A3
A.3
A.3
A.2
ss 1 I
A.1
B.l
B.l
B,1
A,1
A.1
A,1
A,l
A,l
A,l
A,1
A.1
A.1
A.1
A,2
A.2
A,l
6.1
8.1
A,l
A,2
A,2
A,2
R232
R233
R300
R301
R400
R401
R402
R404
R405
R406
R407
R408
R409
R410
R411
R412
R413
R414
R415
R416
R417
R418
R419
A.l
A.3
8.2
8,2
D.2
D,3
D,3
D.2
D.2
D.3
D.3
D.3
D,3
8,3
R421
R422
R423
R424
R446
R447
R448
R449
R452
R453
R454
R455
R456
R457
R458
R459
B,3
8,3
8,3
8.3
8.3
8,3
B,3
R461
R460
R466
R467
R468
R469
R470
D.2
D,2
1
I N I T I A L INSTRUMENT SETTINGS
VOLTAGES ON THIS SCHEMATIC UNLESS OTHERWISE
NOTED, SHOULD BE MEASURED AFTER KEYING IN:;
FOR A3:
SHIFT PRESET
SHIFT FLOAT 1 OFF
f l (CHANNEL CONFIG.)
NEXT
AMPTD 10 V
I)
OUTPUT ASSEMBLY
R206
R207
R208
R209
R210
R211
R212
R213
R216
R217
R218
R219
R220
R221
R222
R223
R224
R225
R226
R227
R228
R229
R230
COMP
NOTES:
W
< P / OSEE REVERSE
A3/A10
SIDE
82
A.2
A.3
8.3
83
A.3
8,3
A.3
C.2
C.2
C.1
B.l
8.1
A3
A,3
A.3
A,3
B.l
A.2
A.l
A.l
A.l
A.l
X,Y
8-52
FOR A10:
SHIFT PRESET
SHIFT FLOAT 2 OFF
f l (CHANNEL
NEXT
NEXT
CONFIG.)
AMPTD 10 V
COMP
X,Y
R490
R491
R492
R493
R494
R495
R496
R497
R499
8.2
8.2
B,2
8,2
8.2
B,2
8.2
82
D.2
T1
T400
A,1
C.2
TP1
TP2
A.l
8.1
C.3
C.3
TP4
TP3
TP5
A,2
A,3
B,3
D.2
C.3
C.3
C.2
TP7
TP6
TP8
TP402
TP403
A.l
A,3
B,2
C,3
C.2
X,Y
8.3
8.3
C.3
C.3
C,2
C.3
C,3
C.3
c,2
D.2
C.2
C.2
c.2
C.3
C.3
u4
u5
U6
U8
u9
u10
U16
U201
U202
U203
U401
U402
U403
U404
U408
VR19
VR31
VR201
VR206
VR208
VR401
VR402
8.1
8.1
B,1
8.1
A,3
B,l
B,1
A.1
A,1
A.l
C.2
C.3
8,3
8.3
8.2
B,1
B,2
A.l
B,1
A.l
B,3
C.3
Model 8904A
Service
CHANGES
On the A3 schematic:
All serial prefixes
0
rev.28MAR89
C230 - Under SHARP CUTOFF (ELLIPTIC) change the value of (2230 to
-
1000pF.
ss2
8-52.1
zss
ES-8
WAS!-
I
n
(3)30A91-
I
4
I
81
L
33(IAS*
6 ' 8 = NIV9 kl31311dWV
OIanV
-
31901 N3AILlO ONV SAVl3kIk
dlBLL
ME3
4
(3IldIll3) JJOlfl3 dWHS
'I I
T
9NIkl3111J
Service
A
t
lP1
I
?
lP2
I
Figure 8-15. Service Sheet Information
B
COMP
-
C
c2
c3
c4
c5
C6
C8
c10
c11
c12
C13
C14
C28
c29
C30
C31
C32
c33
c34
c35
C36
c37
C38
C40
C41
C42
c43
c44
c45
C46
c47
C48
C50
C51
C64
C71
C72
c79
C82
c90
c93
c201
c202
C203
C204
C205
A3 Component Coordinates (1 of 2)
X,Y
D.l
c.1
c.1
8.1
c.1
8.2
c.2
8.3
c.3
8.3
8.3
A,2
A,1
A.2
A.2
A,2
A,2
A,2
A,2
A,2
A,2
A.2
A,2
A,3
A,3
A,3
A,3
A.3
A,3
A,3
A,3
A.3
8.2
8.1
A3
A.3
8.1
8.1
A3
A2
A.1
COMP
X,Y
COMP
X,V
COMP
X,Y
COMP
C206
C207
C208
c209
c210
c211
c212
C213
C214
C215
C216
C217
C218
c219
c220
c221
c222
C224
C225
C226
C227
C228
c229
C230
C232
C300
C301
C302
C303
C304
C401
C402
C403
C404
C405
C406
C407
C408
C409
C410
C411
8.1
8.1
A. 1
8,1
8.1
8,l
C423
C424
C425
C426
C431
C432
C433
C434
C435
C436
C437
C438
C440
C441
C442
C443
C444
C445
C446
C447
C448
C500
C501
C502
C503
C504
C505
C.3
C.3
C,3
C.3
0.2
0.2
0.2
D.2
D.3
D,3
0.3
D.3
C.1
C.2
C.2
C.3
CR300
CR301
CR404
CR405
CR406
CR407
CR408
CR409
CR410
CR411
CR415
CR416
CR417
CR418
CR419
CR420
CR421
CR422
CR423
CR424
CR425
CR426
CR427
CR428
CR429
CR430
C.2
8,2
D,2
K11
K401
K402
K404
A2
L1
L2
D.l
8.2
CR6
CR7
CR8
CR9
CR17
CR18
CR26
CR27
CR202
CR203
CR204
8.3
C.3
A.3
A.3
A.l
A.l
A,1
A,1
A.l
A.1
A.l
A.l
A.l
8.1
8.1
A,1
A,l
A.l
A,2
8.2
8.2
A2
8.2
8,2
8.2
A.3
A.3
A.3
8,3
8.3
8.3
8.3
D.2
C.2
C.3
C.3
0.2
0.2
0.2
0.3
0.3
D,1
C,2
8.3
8.2
8.3
8.3
C,2
8.1
8.1
D,l
D,l
A.1
A.l
A,1
J1
J3
J4
J5
J6
J7
J201
J400
J401
K1
K2
D,2
D,3
C,3
C,3
C.3
C,2
C,2
8.2
8.2
8.2
8.2
C,2
D,2
C,3
D,3
D,2
D,2
D,3
D,3
C,2
D,2
C,3
D,3
D,2
A.2
A.1
A,2
A,2
A.2
A.1
D,2
D,2
8,2
A2
L3
L4
L5
L6
L7
L8
L9
L10
L11
L12
L201
L401
L402
01
02
014
015
016
017
018
019
020
021
033
0201
0202
0203
0204
(3205
0206
0207
X,Y
8.3
C.2
D,2
c8.3
.2
C,3
A2
A,2
A2
A2
A.2
A,2
A,2
8.1
8,3
D.2
8.3
8.3
A.3
A.3
A.3
A,3
A,3
A,3
A,3
A,3
8.1
A,l
A,l
8.1
8.1
8.1
8.1
8.1
p
COMP
0402
0403
0404
0405
0406
0407
0408
R1
R2
R3
R4
R5
R9
R10
R40
R41
R42
R43
R44
R45
R47
R48
R49
R50
R51
R52
R53
R54
R55
R56
R57
R58
R59
R60
R61
R62
R63
R64
D.2
D.3
D,3
D.2
0.2
D.3
D.3
8.1
A.1
A2
A.2
A2
A2
A2
A.2
A.3
A3
A,2
A,3
A,3
A3
A.2
A.2
A.3
A.3
A.3
A3
A.3
A3
A3
A3
A,3
A,3
A3
A3
A3
A3
A.2
Component Locator
<p/o A3’A10
sEi
RLVERSE
sinE
OUTPUT ASSEMBLY
ss2 I
A3 Component Coordinates (2 of 2)
K
R71
R72
R73
R74
R75
R76
R77
R78
R112
R113
R114
R122
R123
R125
R126
R136
R139
R141
R142
R201
R202
R203
R204
D.l
8.1
8.1
8.1
B,1
8.1
I
\
Model 8904A
8,2
A.2
A3
83
8.3
A3
83
A.3
c.2
c,2
C,l
8.1
8.1
A.3
A3
A3
A3
8.1
A2
A.l
A.1
A.1
A.l
R206
R207
R208
R209
R210
R211
R212
R213
R216
R217
R218
R219
R220
R221
R222
R223
R224
R225
R226
R227
R228
R229
R230
p
A,1
8.1
B,l
8,1
A.1
A,1
A.1
A.1
A.1
A.l
A.l
A.1
A.1
A.1
A.2
A.2
A.l
8.1
8.1
A.l
A,2
A,2
A,2
R232
R233
R300
R301
R400
R401
R402
R404
R405
R406
R407
R408
R409
R410
R411
R412
R413
R414
R415
R416
R417
R418
R419
-
A.l
A.3
8.2
8.2
D.2
D.3
D.3
D.2
D,2
D.2
D.2
D.3
D,3
D,3
D,3
8.3
83
8.3
83
8.3
83
8.3
8.3
NOTES:
(OR A101 K2. K4. AN0 K6 ARE WITH THE RELAY
CONTACTS CLOSED: THE OUTPUT OF THE FLOATING
AMPLIFIER DRIVER AND ON/OFF SWITCH WITH
K401 OPEN.
c
I N I T I A L INSTRUMENT SETTINGS
VOLTAGES ON THIS SCHEMATIC UNLESS OTHERWISE
NOTED. SHOULD BE MEASURED AFTER KEYING IN::
FOR A3:
FOR A10:
SHIFT PRESET
SHIFT FLOAT 1 OFF
f 1 (CHANNEL CONFIG. 1
NEXT
AMPTD 10 V
SHIFT PRESET
SHIFT FLOAT 2 OFF
f l (CHANNEL CONFIG.)
NEXT NEXT
AMPTD 10 V
8-54
R421
R422
R423
R424
R446
R447
R448
R449
R452
R453
R454
R455
R456
R457
R458
R459
R460
R461
R466
R467
R468
R469
R470
8,3
C.3
C.3
‘2.2
C.3
C.3
C.3
C,2
D,2
C.2
C,2
c,2
C.3
C,3
C,3
C.3
C.3
D.2
D.2
C.3
C.2
l
~
82
82
82
8,2
82
82
82
8.2
R491
R490
R492
R493
R495
R494
R496
R497
R499
0,2
TI
T400
TPI
TP2
TP3
TP4
TP5
TP6
TP7
TP8
TP402
TP403
A.1
C.2
’
A.l
8.1
A2
A,3
8.3
A,1
A,3
8.2
C,3
C,2
U4
U5
U6
U8
U9
u10
U16
u201
u202
U203
U401
U402
U403
U404
U408
VR19
VR31
VR201
VR206
VR208
VR401
VR402
~
B,l
8,1
8.1
8.1
A3
8,1
B,I
A.1
A.1
A.1
c.2
c.3
83
8.3
8.2
B,1
8.2
A,l
8,1
A.1
8,3
c.3
Model 8904A
Service
CHANGES
On the A3 schematic:
All serial prefixes
0
R417, R422 - Under FLOATING DRIVER AND ON/OFF SWITCH change
the value of R417 and R422 t o 75K ohms.
ss3
rev.28MAR89
8-54.1
6,
12, AND 24 dB ATTENUATORS
C
I10
,K
TO
A2
HlSCELLANEOUS
CONTROL
I
~~
I
RlA
1K
J1121)
<
AT1
I
U10A
-
1
t5VDC
R1C
IK
+5voc
*5
oc
+SVDC
9
+SVOC
Ul88
16
-
Ul0C
2
15
AT2
I
I
I
I+
3
,-
2 4 dB ATTENUATOR
I
ss2
COUP OUT
I
I1
I1
R70
7.968K
I\
I
K2A
+
I
3
13
;
1
P I 0 K4
+5voc
'
--
'
UlSF
12
5
AT3
-
6
a
FOR
I1
AMP D R I V E R AND ON/OFF SWITCH
tSVOC
--I
12 dB ATTENUATOR
-1
I\
I
I
I
I
K4A
I
/
I
I
I
-
I
I
MEASURE:
1. 1 2 Vpp
I
I
I
-
P/O K W 1
7
6 dB
ATTENUATOR -I
2
I
3
NC
R117
NC
I N I T I A L INSTRUMENT SETTINOS
OUTPUT 1
FOR A I 0
YQ
8.1U
OFF
MEASURE:
8
SHIFT
WTPUT 2 OFF
Vpp
(SEE NOTE)
I
ss4
K6A
(SEE NOTE)
I
I
AOOITIONS TO I N I T I A L
INSTRUMENT SETTINGS
AMPTO
I
I
/
I
AOOITIONS TO I N I T I A L
INSTRUMENT SETTINGS
AHPTO 6 2 5 nV
+lSVOC
TO
A3:
SHIFT
I FLOATING
I
I
-
)IDOITIONS
K3
3
P/O
I
h
I
+5voc
Ul0E
I
(SEE NOTE)
I
I
P'
I
U180
1
I
I
I
*5voc
t5VDC
I
2.5 V
MEASURE:
+ . 6 Vpp
3.800K
3.808
I
I
I
1
I
I
I
I
A001TION5 TO I N I T I A L
INSTRUMENT SETTINGS
-1SVDC
AMPTO 5 V
MEASURE:
9 Vpp
p--
-15voc
ss3
8-55
Serv i ce
+
t
I
lP'
A
f
A I-
0
lP2
F l g u r e 8-16. Service Sheet Information
TP4
I
COMP
C
c2
c3
c4
c5
C6
C8
c10
c11
c12
C13
C14
C28
C29
C30
C31
C32
c33
c34
c35
C36
c37
C38
C40
C41
C42
c43
c44
c45
C46
c47
C48
C50
C51
C64
C71
C72
c79
C82
c90
c93
c201
c202
C203
C204
C205
_-
I
El
I
A3 Component Coordinates (1 of 2)
--x,v
-
I
\
\
I
lP5
n
TPB
I
I
I
I
lP4W
Component Locator
1412
C
TPtW
I
I
D.l
c.1
c.1
8,l
c.1
82
c.2
8.3
c.3
8,3
8.3
A.2
A.l
A2
A2
A.2
A.2
A.2
A.2
A,2
A.2
A.2
A.2
A.3
A3
A3
A.3
A3
A.3
A3
A3
A,3
8,2
B,l
A,3
A3
8.1
8.1
A.3
A.2
A.1
A.1
A.1
A.1
A,l
COMP
x,y
C206
C207
C208
C209
c210
c211
c212
C213
C214
C215
C216
C217
C218
c219
c220
c221
c222
C224
C225
C226
C227
C228
c229
C230
C232
C300
C301
C302
C303
C304
C401
C402
C403
C404
C405
C406
C407
C408
C409
C410
C411
C412
C413
C421
C422
8.1
B,I
A,l
8.1
8,l
8.1
A.1
A,l
A,l
A.l
A.l
A,l
A,1
A.l
A.1
8.1
8.1
A.l
A.l
A.l
A.2
8.2
8.2
A2
8,2
8,2
8.2
A3
A.3
A,3
B,3
8.3
8.3
8.3
D,2
c,2
c.3
c.3
D,2
D.2
0.2
0.2
0.2
D.2
D.2
COMP
X,Y
COMP
C423
C424
C.3
C.3
C425
C426
C431
C432
C433
C434
C435
C436
C437
C438
C440
C441
C442
c443
C444
C445
C.3
C,3
C446
C447
C448
C500
C501
C502
C503
C504
C505
D.3
0.3
D.1
C.2
8.3
8.2
6 3
8.3
C.2
CR300
CR301
CR404
CR405
CR406
CR407
CR408
CR409
CR410
CR411
CR415
CR416
CR417
CR418
CR419
CR420
CR421
CR422
CR423
CR424
CR425
CR426
CR427
CR428
CR429
CR430
c,2
B,2
D,2
D.2
D.3
c,3
c,3
c,3
c.2
c,2
8.2
8.2
8.2
8.2
c.2
D.2
c.3
0.3
0.2
D.2
D.3
0.3
c.2
D.2
c.3
D.3
CR6
CR7
CR8
CR9
CR17
CRIB
CR26
CR27
CR202
CR203
CR204
CR205
CR207
CR209
CR210
CR211
CR212
8,3
C,3
A,3
A.3
8.1
8.1
D.1
D.1
A,l
A,l
A,l
A.1
8.1
A,l
8.1
A,l
A,l
J1
J3
J4
J5
J6
J7
J201
J400
J401
D.2
A.2
A.l
A.2
A.2
A.2
A.l
D.2
D.2
D,2
D,2
D,2
0.2
D.3
D,3
D,3
0.3
C.1
C.2
C.2
c.3
D.2
0.2
K1
K2
K3
K4
K5
K6
K8
K10
COMP
-
8,2
A2
8,3
A3
8,3
A3
c.2
A.2
K11
K401
K402
K404
A.2
L1
L2
L3
L4
L5
L6
L7
L8
L9
L10
L11
L12
L201
L401
L402
D.l
8.2
c.2
01
8,3
8,3
A3
A3
A3
A.3
A3
A,3
A.3
A.3
8.1
A.1
All
8.1
8.1
8.1
8.1
8.1
A.1
A,1
A,1
c.2
8.2
D,2
014
015
016
017
018
019
a20
a21
a33
0201
0202
0203
0204
a205
a206
0207
0208
0209
021 0
0300
Q301
a401
A3 Component Coordinates (2 of 2)
-
COMP
02
8.3
c.2
D,2
8,3
c.3
A.2
A2
A.2
A2
A.2
A.2
A.2
8.1
B,3
D,2
0402
0403
0404
0405
0406
0407
0408
R1
R2
R3
R4
R5
R9
R10
R40
R41
R42
R43
R44
R45
R47
R48
R49
R50
R51
R52
R53
R54
R55
R56
R57
R58
R59
R60
R61
R62
R63
R64
R65
R66
R67
R68
R69
R70
D.l
B,1
B,1
8.1
8.1
B,1
8.1
A.1
A.2
A.2
A2
A,2
A.2
A.2
A3
A3
A2
A3
A3
A3
A2
A2
A3
A,3
A3
A3
A.3
A3
A3
A3
A3
A3
A3
A3
A3
A.3
A2
0
A3/A10
OUTPUT ASSEMBLY
R71
R72
R73
R74
R75
R76
R77
R78
R112
R113
R114
R122
R123
R125
R126
R136
R139
R141
R142
R201
R202
R203
R204
R205
D.2
D.3
D,3
D.2
D,2
0.3
D.3
W
SEE REVERSE S I D E
Model 8904A
ss3 I
8.2
A2
A3
8,3
8,3
A3
8.3
A,3
c.2
c,2
c.1
8,l
B,l
A3
A,3
A.3
A.3
B,1
A2
A.l
A.1
A.1
A.l
A.l
R206
R207
R208
R209
R210
R211
R212
R213
R216
R217
R218
R219
R220
R221
R222
R223
R224
R225
R226
R227
R228
R229
R230
R231
A.l
B,1
B,1
8.1
A,l
A.1
A.1
A.l
A.l
A.1
A.1
A.l
A.1
A.1
A.2
A.2
A.1
8.1
8.1
A.1
A,2
A,2
A.2
A3
R232
R233
R300
R301
R400
R401
R402
R404
R405
R406
R407
R408
R409
R410
R411
R412
R413
R414
R415
R416
R417
R418
R419
R420
A.l
8.2
A
3
8.2
D.2
D.3
D,3
D.2
D.2
D.2
D,2
D.3
D,3
D.3
D.3
8.3
8,3
8.3
8,3
B,3
8.3
8.3
8.3
C,3
R421
R422
R423
R424
R446
R447
R448
R449
R452
R453
R454
R455
R456
R457
R458
R459
R460
R461
R466
R467
R468
R469
R470
R471
8.3
83
C.3
c.3
c,2
C.3
C.3
c.3
C.2
D.2
C.2
C.2
c,2
C.3
C,3
C.3
C,3
C.3
D.2
D,2
C,3
C.3
C,2
C.3
R490
R491
R492
R493
R494
R495
R496
R497
R499
B,2
T1
T400
A.l
C.2
TP1
TP3
TP2
A.l
A.2
8.1
TP4
TP5
TP6
TP7
TP8
TP402
TP403
U2
A.3
8,2
8,2
B,2
8,2
8.2
8,2
8,2
D.2
8.3
A.l
A.3
8.2
C.3
C.2
8.1
u4
U5
U6
U8
u9
u10
U16
u201
U202
U203
U401
U402
U403
U404
U408
B,l
8,l
8,l
B,l
A.3
8.1
8,l
A.1
A.1
A.1
c.2
c.3
VR19
VR31
VR201
VR20f
VR20t
VR401
VR40:
8.1
8,2
A.l
B,1
A.l
6.3
c.3
8,3
83
8.2
NOTES:
2
1
8 (OPT 002)
OUTPUTS
REAR-PANEL OUTPUTS ARE WITH A3
(OR Al0) K402 CONTACTS CLOSE0
FRONT PANEL
REAR PANEL (OPT 004)
ws
W2
I N I T I A L INSTRUHENT SETTINGS
VOLTAGES ON THIS SCHEMATIC UNLESS OTHERWISE
NOTED. SHOULD BE HEASUREO AFTER KEYING IN:;
FOR A3:
FOR A10:
SHIFT PRESET
SHIFT FLOAT 1 OFF
f l (CHANNEL CONFIG.)
NEXT
AMPTO 10 V
8-56
THE VOLTAGE SHOWN AT THE FRONT OR
SHIFT PRESET
SHIFT FLOAT 2 OFF
f l (CHANNEL CONFIG.)
NEXT NEXT
AMPTO 10 V
Model 8904A
Service
CHANGES
2948A and above
the +5VREF. Draw a jumper wire acrosse the opening and label it W1. Label
the left end of the jumper, J8(2) and the right end of the jumper, J8(1).Draw
node dot about 0.125 inch below J8(1)and label it, J8(3). Connect a common
ground symbol to J8(3). Write the following note directly under the circuit
block.
“Jumper, J8, connects pins 1 and 2 for all instruments except when equipped
with option 006. Connect 58 pins 2 and 3 for option 006 equipped instruments.
ss4
reu.3ONOV89
8-56.1
tSV0C
+
A l l
I
;q
1
RELAY
DRIVER L O Q l C
7
7
'5VUF
\
IVERVOLTAOE
'ROTECTION
ow
-
OVERVOLTAGE RELAY DRIVE
- \-
PM K11
1
-15voc
I \
R15+
1.1w
P/O *ID2
FLT H l
I2
1
.
(7
7-ATTENUATOR
11113
b.UK
-
7
4,
RII4
51.40
ss3 @
2 L
I
I
I-
OVERVOLTAGE DETECTOR
+lSWC
I
-Rff'.
t ----.---A
042b
I*
I
2
FLOATINO OR ORWNDED AUDIO OUTPUT
7
I
LIS2
rm
I
II
I!
II
OIll
m
I
$71
I..I
-,2VOC
V
-Isvoc
4 4
ss4
8-57
Model 8904A
Service
CHANGES
~
~~
A6 Schematic and Component locator
2948A and above
0
0
Use the component locator on page 8-60 for the A6 High Power output
assembly component locations.
Use SS5 (Opt 006) on page 8-61 for the A6 High Power Oustput assembly
schematic information.
ss5
rev.15DEC89
8-59
Service
Model 8904A
ss5
8-60
Figure 8-1 7.Component Locator For S55
rev. 15DEC89
P I 0 A3/A10 OUTPUT
ASSEMBLY
------
1I
J480
!
I
W18
II
I
35%
I
I
I
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