HP 203A Operating and Service Manual

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OPERATING AND SERVICE MANUAL
MODEL 203A
VARIABLE PHASE
FUNCTION GENERATOR
SERIALS PREFIXED: 12011
Copyright Hewlett-Packard Company 1964
P.O. Box 301, Loveland, Colorado, 80537 U.S.A
PART NO, 00203-99002
Printed: JULY 1973
01760.7
inns
CERTIFICATION
The Hewlett-Packard Company certifies that this instrument was
thoroughly tested and inspected and found to meet its published
specifications when it was shipped from the factory. The Hewlett-
Packard Company further certifies that its calibration measure-
ments are traceable to the U.S. National Bureau of Standards to
the extent allowed by the Bureawvs calibration facility.
WARRANTY AND ASSISTANCE
All Hewlett-Packard products are warranted against defects in
materials and workmanship. This warranty applies for one year
from the date of delivery, or, in the case of certain major compo-
nents listed in the operating manual, for the specified period. We
will repair or replace products which prove to be defective during
the warranty period provided they are returned to Hewlett-
Packard. No other warranty is expressed or implied. We are not
liable for consequential damages.
Service contracts or customer assistance agreements are available
for Hewlett-Packard products that require maintenance and re-
pair on-site.
For any assistance, contact your nearest Hewlett-Packard Sales and
Service Office. Addresses are provided at the back of this manual.
Model 203A Index
SECTION | GENERAL INFORMATION
SECTION I INSTALLATION
SECTION lil OPERATING INFORMATION
SECTION IV PRINCIPLES OF OPERATION
SECTION V MAINTENANCE
SECTION VI REPLACEABLE PARTS
01760..1 iii
Table of Contents
List of Tables
Section Pare
1 GENERAL INFORMATION L . . . . +4 + .. 1-1
1-1, Description. . . . 2 44 4 . +... 1-1
1-5, Options Available . . 44 44 4 + 4% 1-1
1-7. Applications . . . . . 4 4 4 4 4 4 4 0 1-1
1-9. Instrument Identification. . . . . . . 1-1
Section Page
I INSTALLATION, , . 2 4 4 e. e sees 2-1
2-1, Inspection . . 2 2 2 4 2 4 4 4 +... 2-1
à-3. Power Kequirements. . . . . . . 2-1
2-5. Three- Conductor Power Cable . 2-1
2-8. Installation. . . . . + + 4 4 4 6 4 4 5 2-1
2-10. Rack/Bench Installation . . . . . . . 2-1
2-12. Repackaging for Shipment . . . . . . 2-1
Section Page
HI OPERATION 221 4 4 4 4 44 4 4 4 4 4 4 4 4 3-1
3-1. Introduction .. ... .. .. ... 3-1
3-3. Controls and Indicators , . . . . .. 3-1
3-5. Operating Instructions . . . . . .—.. 3-1
3-7, Calibration for 60 Cycle Line
Frequency « . + + +4 + 4 4 4 + + 4 4 3-1
3-9. Calibration for Line Frequencies
Other Than 60 Cycles . . . . + +. 3-1
Section Page
IV PRINCIPLES OF OPERATION . . 44 +... 4-1
4-1, Overall Description . . + + + + + + + 4-1
4-5, Crystal Oscillator and Divider
4-7
4-9
dei
4-1
4-2
Assembly (A1) . . . ........
. Crystal Oscillator . + + + + + +
; 9:1 Frequency Divider
6. Variable Phase Shifter Assembly . . 4-
8. RF Amplifiers {A2) . . . .. .... =
0 Variable Phase Channel RF
Amplifier . , . . . 4 +4 + 4 4 4 0 4-2
4-23, Reference Phase Channel RF
Amplifier . . + 2 4 4 4 4 4 4 44 4-2
4-25, Variable Frequency Oscillator
(A10)Y . . . 2 4 2 24 4 42 4 4 2 2 4 0 4-2
4.27. Decade Modules {A11-A16) . . . . . 4-2
4-29, Decade Module (ATI) . . . .. .. 4-2
4-31. Decade Modules, A12 through
| AÍTO, 2 2 4 4 4 4 4 2 e e ae 4-3
4-33. Modulator Assembly, A3 . . .. .. 4-3
4-35, Modulator Driver Amplifier . . . 4-3
4-37. Reference Phase Channel, . . . .
CC Modulator . . . 24 4 4 4 446 4.3
4-40 Variable Phase Channel Modulator 4-
. DC Amplifier Assemblies ASand AT, 4-3
4-44 Reference Phase Channel DC
Amplifier Assembly, . . . . . . 4-3
Table Page
1-1, Specifications . 1 114 4 4 44 4 are 1-0
2-1. Checks for Incoming Inspection
(Specifications) . . 1 44 4 21 4 444 2-2
5-1. Required Test Equipment. . . . . . . . . 5-1
5-2. Frequency Dial Calibration. . . . .. .. 5-3
5-3. Phase Lag Check .. . 1. 42444 4 144 5-6
iv
Model 2034
Section
IV PRINCIPLES OF OPERATION (Cont'd)
Page
4-46, Variable Phase Channel DC
Amplifier Assembly , . . , . 4-3
4-48, Square Wave Amplifier Assemblies
AS and AS. . aaa 4-3
4-50, Reference Phase Channel Square
Wave Generator , . . . . .. 4-3
4-52. Variable Phase Channel Square
Wave Generator . . . . . . . 4-4
4-54, DC Power Supply, A21, A22 4-4
4-56, Calibrate Feature . . . . . . . .. 4-4
Section Page
V MAINTENANCE 2444 4 4 6 4 4 4 440 5-1
9-1. Required Test Equipment . . . . 5-1
5-3. Performance Checks . ... . .. 5-1
9-5 Frequency Dial Calibration. . 5-1
5-8, Frequency Response . . . . . 5-2
5-7 Sine Wave Check . . . . . .. 5-3
5-8 Square Wave Check . . .... 5-5
5-9 Phase Lag Check . . . . . .. 5-5
9-10. Instrument Cover Removal . . . 5-6
5-12. Adjustments . . . 1 + 2 4 2 + 4 29 5-6
5-14. Power Supply A22 Adjustments 5-6
5-15. 4,995 Mc Oscillator and 9:1
Divider (A1) Adjustment. . . 5-8
5-16, Adjustable Phase Shifter (A25)
Adjustment. . . . . +4 + + + = 5-1
5-17, RF Amplifier Adjustment {A2) . 5-7
5-18. Decade Module (A11)
Adjustment. . . . . . . ia... 7
5-19. Decade Module (A12-A16)
Adjustments . . .. . . .=—.. 5-8
5-20. Frequency Dial Adjustment , ‚ 5-8
5-21, Modulator (A3) Adjustment . . 5-8
5-22. Distortion . . . ...... .. 5-8
5-23, Frequency Response. . , . . . 5-8
3-24, Phase Lag Dial . 1.44 + + + 5-9
5-25, Square Wave (A8 and A9}
Adiustment. . . 22 2 2 + _ . 5-9
5-26, Troubleshooting . . . .. . . . .. 5-9
5-28. Printed Circuit Board Repair . . . 5-9
Section Page
Vi REPLACEABLE PARTS . . .... . .. 6-1
6-1. Introduction. . . .. ... . .. .. 6-1
6-4. Ordering Information . . . . . .. ‚6-1
6-6. Non-Listed Parts . . ... . . .. 6-1
APPENDIX
A CODE LIST OF MANUFACTURERS
B SALES AND SERVICE OFFICES
с MANUAL BACKDATING CHANGES
Table Pape
3-4. Module A11-A14 Adjustment . . . . . . . 5-8
9-5. Purpose of Factory Selected Values . 5-10
9-6, Troubleshooting Summary . . . » «e. 5-11
6-1, Index by Reference Designator . . . . . . 6-2
6-2. Replaceable Parts, . . . . + « « «+ .. 6-12
01760-3
7 .
Model 203A
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017603
Page
Model 203A Variable Phase Function
Generator. . . . +24 4 1 4 4 4 2 210 1-0
Front Panel Description. . . . . . ... 3-2
Operating Instructions. . . . . . .... 3-3
Circuit Details. . . . .......... 4-2
Block Diagram. . .. .......... 4-5
Frequency Dial Calibration, . . . ... 5-2
Frequency Response. . . . ue. e ee 5-2
Sine Wave Check. . . . . 24 244 4 4 1. 5-4
Square Wave Check . ..,........ 5-4
Phase Lag Check ............ 5-5
Phase Lag Dial Adjustment ,...... 3-10
Typical Waveforms . . . . . 5-12/5-13/5-14
Chassis - Top View . . . ..... 5-15/5-16
5 Mc Oscillator and 9:1 Divider Assembly
A1-Component Location . . . . . 5-17/5-18
5 Mc Oscillator and 9:1 Divider
Assembly Al - Schematic . . . . 5-17/5-18
RF Amplifier Assembly A2 -
Component Location . . . . .. o. ... 5-19
RF Amplifier Assembly A2 and
Adjustable Phase Shifter Assembly
A25 - Schematic . . . ......... 5.19
VFO Assy A10 - Component Location 5-20
9-19a,
5-19b,
5-20.
5-21.
5-22.
5-23.
List of Illustrations
Page
Decade Module Assy All thru A16 -
Component Location. . . . . . . 5-21/5-22
VFO Assy A10 and Decade Module
Assy A11 thru A16 - Schematic. 5-21/5-22
Modulator Assy A3 - Component
Location. . . . .. ....... 5-23/5-24
Modulator Assy A3 - Schematic . 5-23/5-24
DC Amplifier Assy A6 and A7 -
Component Location . . 1.4... ,. 5-25
Low Pass Filter Assy A4, DC Ampl
Assy A6 and Square Wave Gen Assy.
A8 - Schematic . . . 1 224 4 4244 5-25
Low Pass Filter Assy A4 and A5 -
Component Location . . . ...... 0-26
Square Wave Gen Assy AS and Ag -
Component Location . . . . . . 5-27/5.28
Low Pass Filter Assy AS, DC
Ampli Assy AT, and Square Wave
Gen Assy - Schematic. . . . . . 5-27/5-28
Power Supply Assy A22-Component
Location. . . . . . .......... 5-29
Power Supply Assy A22 and Rectifier
Assy A21 - Schematic. . . . . .. .. 5-29
Frequency Tuning Assy, Mechanical
Parts . + 2 44 4 4 404 4 4 4 4 4 2 2 0 5-30
Section 1
Figure 1-1 and Table 1-1
Model 203A
1-0
a
Figure 1-1. Model 203A Variable Phase Function Generator
Table 1-1. Specifications
FREQUENCY RANGE OUTPUT IMPEDANCE
0.005 Hz to 60 kHz in seven decade ranges. * 600 ohms
DIAL ACCURACY OUTPUT SYSTEM Do
Direct coupled output is isolated from ground оо
+1% of reading. and may be operated floating up to 500 VDC.
FREQUENCY STABILITY DISTORTION
py , . : ; Total harmonic distortion hum and noise > 64
Within +1% including warmup drift and line
voltage variations of +10%, db below fundamental (< .06%) at maximum
: output,
OUTPUT WAVEFORMS FREQUENCY RESPONSE
Sine and square waves are available simulta- +1% referenced to 1 kHz,
neously. All outputs have common chassis
terminal, SQUARE WAVE RESPONSE
Rise and Fall Time: < 200 nsec.
MAXIMUM OUTPUT VOLTAGE Overshoot: < 5%, at full output.
30 volts peak-to-peak open circuit for sinus-
oidal and square waveforms. PHASE RANGE
OUTPUT POWER 0 to 360 degrees.
| Accuracy: +59 sine wave.
о
5 volts into 600 ohms (40 mw); at least 40 db =107 square wave.
continuously adjustable attenuation on all
outputs. POWER
115 or 230 у +10%, 50 to 400 Hz.
*Two lower ranges of 0.0005 Hz foption: 91) DIMENSIONS
and 0. 00005 Hz (option: 02) are available on Cabinet mount, 5 1/4" high x 16 3/4" wide and
special order, 11 1/2" deep (133 x 425 x 286 mm). o
01760-5
Model 203A
Section I
Paragraphs 1-1 to 1-11
SECTION |
GENERAL INFORMATION
1-1, DESCRIPTION,
1-2. The Hewlett-Packard Model 203A Variable Phase
Function Generator is a low frequency function gen-
erator which provides two sine wave and two square
wave test signals at frequencies from 0.005 cps to
60 kc. (Refer to paragraph 1-5, Options Available.)
1-3. The four test signals are provided at the front
panel OUTPUT connectors at an open circuit signal
level of 30 volts peak-to-peak. The sine wave and
square wave test signals provided at the REFERENCE
PHASE OUTPUT connectors are fixed in phase and
provide a reference phase for the test signals at the
VARIABLE PHASE OUTPUT connectors. The vari-
able phase test signals are continuously variable from
0 to 360 lag with respect to the phase of the refer-
ence test signais, The amplitude of the four output
signals can be varied with individual continuously
variable 40 db attenuators (AMPLITUDE controls.)
1-4, The output terminals are floating with respect
to ground and can be used to supply an output voltage
with the common terminal grounded or can be floated
up to 500 volts de above chassis ground. The output
impedance for all four test signal outputs is 600 ohms.
1-5. OPTIONS AVAILABLE.
1-6. Options 01 and 02 are available to provide two
additional {frequency ranges tothe Model 203A. Option
01 includes one additional Decade Module Board
Assembly which extends the lower limit of the fre-
quency range from 0, 005 ¢ps to 0. 0005 cps. Option
02 includes two additional Decade Module Board As-
semblies whichextendthe lower limitof the frequency
range from 0, 005 cps to 0. 00005 cps. These two
01760-4
options can also be installed as a field modification
(see Section VI for stock number of Decade Module
Board Assemblies). |
1-7. APPLICATIONS.
1-8, The Model 203A can be used for phase shift
measurements, vibration studies, servo applications,
medical research, distortion measurements, geo-
physical problems, subsonic and audio testing,
1-9. INSTRUMENT IDENTIFICATION.
1-10, Hewlett-Packard uses a two-sectionnine char-
acter (OO00A00000) or eight character (000-00000 or
000A00000) serial number. The first three or four
digits (serial prefix) identify a series of instrument:
the last five digits identify a particular instrument in
that series. A letter placed between the two sections
identifies the country where the instrument was man- -
ufactured. The serial number appears on a plate
located on the rear panel. All correspondence with
Hewlett-Packard Sales/Service Offices with regard
to an instrument should refer to the complete serial
number,
1-11, Tf the serial prefix does not agree with the
serial prefix onthe title page of this manual, a "Manual
Changes" sheet supplied will describe changes which
will adapt this manual to an instrument with a differ-
ent serial prefix. Technical corrections {if any) to
this manual, due to known errors in print, are called
Errata and are shown on the change sheet. For in-
formation on manual coverage of any hp instrument,
contactthe nearest hp Sales/Service Office (addresses
are listed at the rear of this manual),
1-1
Model 203A
Section II
Paragraphs 2-1 to 2-13
SECTION 11
INSTALLATION
2.1. INSPECTION.
2-2. This instrument was carefully inspected both
mechanically and electrically before shipment. It
should be physically free of mars or scratches and in
perfect electrical order upon receipt. To confirm
this, the instrument should be inspected for physical
damage in transit. Also checkfor supplied accesso-
ries, andtestthe electrical performance of the instru-
mentusing Table 2-1 or the procedure outlined in para-
graph 5-3. If there is any apparent damage, file a
claim withthe carrier and refer to the warranty on the
inside front cover of this manual.
2-3. POWER REQUIREMENTS.
2-4. The Model 203A will operate from either 115 or
230 vac, 50-400 Hz. The instrument can be easily
converted from 115 to 230 volt operation by changing
the position of the slide switch, located on rear panel,
so that the designationappearing onthe switch matches
the nominal voltage of the power source.
2-5. THREE-CONDUCTOR POWER CABLE.
2-6. To protect operating personnel, the National
Electrical Manufacturers’ Association (NEMA) rec-
ommends that the instrument panel and cabinet be
grounded. All Hewlett-Packard instruments are equip-
ped with a three-conductor power cable which, when
plugged into an appropriate receptacle, grounds the
instrument. The offset pin on the power cable three-
prong connector is the ground wire,
2-7. To preserve the protection feature when oper-
ating the instrument from a two-contact outlet, use a
three-prong to two-prong adapter and connect the
green pigtail on the adapter to ground.
2-8. INSTALLATION.
2-9. The Model 203A is fully transistorized: there-
forenospecial cooling is required. However, the in-
strument should not be operated where the ambient
temperature exceeds 55°C (131 °F).
01760-4
2-10. RACK/BENCH INSTALLATION.
2-11. The Model 203A is initially shipped as a bench
type instrument (unless ordered specifically as a rack
type) with plastic feet and a tilt stand in place. Con-
versionto a rack-mounted instrument can be accom-
plished by using the rack mounting kit and instructions
furnished with your instrument.
2-12. REPACKAGING FOR SHIPMENT.
2-13. The following is a general guide for repacking
an instrument for shipment. If you have any questions,
contact your local & Sales and Service Office (see
lists in Appendix for location).
a. Place instrument in original container if it is
available. If original container is not available, one
can be purchased from your nearest @ Sales and
Service Office,
Note
If instrument is to be shipped to Hewlett
Packard for service or repair, attach to
the instrument a tag identifying the owner
and indicate the service or repair to be
accomplished; include the model number
and full serial number of instrument. In
any correspondence, identify the instru-
ment by model number and serial number
prefix,
Tf original container is not used,
b. Wrap instrument in heavy paper or plastic before
placing in an inner container.
¢. Use plenty of packing material around all sides
of instrument and protect panel face with cardboard
strips.
d. Place instrument and inner container ina heavy
carton or wooden box and seal with strong tape or
metal bands.
e. Mark shipping container with "Delicate Instru-
ment, " "Fragile" etc.
Section II Model 203A
Table 2-1
Table 2-1. Checks for Incoming Inspection (Specifications)
Test . .
Check Equipment 203A Control Settings Output Connector Specifications
Maximum Output Oscilloscope | Amplitudes fully clock- | REFERENCE PHASE v | Open Circuit:
Voltage wise REFERENCE PHASE: | 30v PTP
FREQUENCY 1 ke VARIABLE PHASE vv 500 2 load:
VARIABLE PHASE п, ^^ > 5 у RMS
Vu ЮУ РТР
Frequency Range Oscilloscope | АН ranges at low Any one cutput 005 cps to 60 Кс
DC Coupled | end and high end {output at all
of dial points)
Square Wave Response | Oscilloscope | FREQUENCY 60 ke
Rise Time DC Coupled REFERENCE PHASE "| <200 nsec
Fall Time < 200 nsec
Ampl. of Overshoot <. 75 volts (5%)
Rise Time VARIABLE PHASE © < 200 nsec
Fall Time < 200 nsec
Ampl. of Overshoot <. 75 volts (5%)
Dial Accuracy Electronic FREQUENCY -All Any one output +1% of reading
Counter ranges at least
(Use period two points onthe
for low fre- dial
quencies)
Frequency Response Oscilloscope | REFERENCE: 1 ke REFERENCE PHASE ~v | £1% referenced to
DC Coupled | Check all ranges at | VARIABLE PHASE 1 ke
least three points
on the dial
Distortion Distortion All ranges at least REFERENCE PHASE | > - 64 db
Analyzer one point on dial VARIABLE PHASE vv > - 84 db
(Rotate phase dial to
achieve worst case)
2-2
01760-1
Model 203A
Section III
Paragraphs 3-1 to 3-10
SECTION Hi
OPERATION
3-1. INTRODUCTION.
3-2. The Model 203A generates two sine wave and
two square wave signals which are available simul-
tancously at the front panel OUTPUT connectors. The
output signal frequency is determined by the position
of the FREQUENCY dial and FREQUENCY MULTI-
PLIER switch. By the use of the PHASE LAG con-
trol, the phase of the VARIABLE PHASE OUTPUT
signals (one sine wave and one square wave) can be
continuously adjusted from 0” to 3607 with respect to
the REFERENCE PHASE OUTPUT signals. The OUT-
PU terminals provide an open-circuit signal level of
30 volts peak-to-peak. The individual AMPLITUDE
controls provide 40 db of attenuation for each output
signai, The CAL ADJ control provides a means of cali-
brating the FREQUENCY dial with the line frequency.
3-3. CONTROLS AND INDICATORS.
3-4. Figure 3-1 describes the function of all front
panel controls, connectors, and indicators. The des-
cription of each component is keyed to a drawing which
is included within the figure.
3-5. OPERATING INSTRUCTIONS.
3-6. Figure 3-2 contains operating procedures keyed
to a drawing included in the figure. Refer to figure
3-1forthe function of each control and paragraph 2-3
for setting the line voltage switch.
01760-2
3-7, CALIBRATION FOR 60 CYCLE LINE
FREQUENCY.
3-8. A quick procedure for checking the calibration
of the frequency dial is as follows:
a. Set the FREQUENCY dial to 8 (CAL).
b. Set the FREQUENCY MULTIPLIER to CAL,
(The pilot light will flicker.)
¢. Adjustthe CAL ADJ for minimum rate of flicker.
Note
If the flicker rate is not close to mini-
mum, use the Frequency Calibration
check paragraph 5-5.
When the FREQUENCY MULTIPLIER
switch 18 in the CAL position, there is
no output at the REFERENCE PHASE
TL: OUTPUT connector.
3-9. CALIBRATION FOR LINE FREQUENCIES
OTHER THAN 60 CYCLES,
3-10. For line frequencies other than 80 cps the FRE-
QUENCY dial is set to 1/10 of the line frequency (40
to 400 cps line frequency). Again the calibration is
made with the front panel CAL ADJ control, which is 2 |
adjusted fora minimum flicker rate of the pilot lamp.
For line frequencies above 600 cps the FREQUENCY
dial is set to 1/30 of the line frequency (33. 3 for a -
1000 cps line frequency). Atthe higher line frequen-
cies the flicker intensity decreases and the CAL ADJ
control sensitivity increases.
3-1
Section II Model 203A
Figure 3-1
WAHRE Died
FUNCTION [i RAAT OF
MOOEL ZA
- a - "
E AE a
AECE EE LL ne
1. Push ON/OFF power switch. 11, REFERENCE PHASE channel square wave
AMPLITUDE control, provides continuously
2. Pilot light and calibration indicator. adjustable attenuation of up to 40 db.
3. Not Assigned. 12. REFERENCE PHASE channel square wave
output terminals, provide anominal 30 volts peak-
4. FREQUENCY selector dial, indicates cps to-peak from а 600 ohm source impedance.
times the FREQUENCY MULTIPLIER switch
setting,
13. PHASE LAG control, provides continuously
adjustable phase lag from 07 through 3607 of the
variable phase channel with respect to the refer.
ence phase channel,
5. Vernier, provides fine frequency adjustment.
6. FREQUENCY MULTIPLIER, selects frequency
range andin the CAL position sets up the 203A for 14. VARIABLE PHASE channel sine wave
frequency dial calibration (see paragraph 3-7). AMPLITUDE control, provides continuously
| adjustable attenuation of up to 40 db,
7. CAL ADJ, adjust frequency dial calibration
(see paragraph 3-7). 15. VARIABLE PHASE channel sine wave out.
| put terminals, provide a nominal 30 volts peak.
to-peak from a 600 ohm source impedance.
8. REFERENCE PHASE channel! sine wave |
AMPLITUDE control, provides continuous adjust- 18. VARIABLE PHASE channel square wave
able attenuation of up to 40 db, AMPLITUDE control, provides continuously
adjustable attenuation of up to 49 db,
9. REFERENCE PHASE channel sine wave output
terminals, provide a nominal 30 volis peak-to-peak
from a 600 ohm source impedance. 17. VARIABLE PHASE channel square wave
. | output terminals, providea nominal 30 volts peak-
10. Earth Ground. о to-peak from'a 600 ohm source impedance.
Ch
Figure 3-1, Front Panel Description
3-2 01760-2
Model 203A
section II
Figure 3-2
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VARTABI.E PISE
FUNCTION CFNEGANA
MOTRIL 2034
1. Push LINE switch ON, pilot lamp glows.
4, Select the desired test signal(s) and connect
load to OUTPUT connector(s).
2, The Frequency Calibration may be compared
5. Set AMPLITUDE control{s) for desired signal
to line frequency as described in paragraph 3-7. level.
3. Sei FREQUENCY dial and MULTIPLIER 6. Set PHASE LAG control for desired degree of
Switch to desired output frequency. Use vernier phase lag of the VARIABLE PHASE test signal(s)
control on FREQUENCY dial for fine frequency with respect to the REFERENCE PHASE test
adjustments. | signal(s).
Figure 3-2. Operating Instructions
01760-3
3-3
Model 203A
Section IV
Paragraphs 4-1 to 4-19
SECTION IV
PRINCIPLES OF OPERATION
4-1. OVERALL DESCRIPTION,
4-2. This section describes how the Model 203A
Var:able Phase Function Generator operates. The
block diagram, figure 4-2, shows the main sections
and the signal flow within the Model 203A.
4-3. The Model 203A is a beat-frequency oscillator
which, by mixing two high-frequency signals, generates
signals in the frequency range of 0.005 cps to 60 ke
(ref-r to paragraph 1-5 for options). One of the high
freciency signals is a fixed frequency; the other is
var.ible. The Model 203A has two signal channels,
RESERENCE PHASE and VARIABLE PHASE each
of wiich produces a sine-wave signal anda square-
wav: Signal. The two channels are electrically simi.
lar except that the VARIABLE PHASE channel con-
tains a continuously adjustable phase-shifting circuit
which changes the phase relationship of the VARI-
ABLE PHASE OUTPUT with respectto the REFER-
ENCE PHASE OUTPUT. The four signals {two re-
ference phase and two variable phase) are available
simultaneously at the OUTPUT connectors.
4-4. The fixed frequency signal, which is generated
by a crystal oscillator, is applied toboth channels and
routed to a modulator through an RF Amplifier within
each channel. The variable frequency signal is applied
directly to the modulator of each channel. The fre-
quency of the variable frequency signal is controlled
by the positionof the FREQUENCY dial and the setting
of the FREQUENCY MULTIPLIER switch. Thesetwo
signals are mixedin the modulator and the difference
in frequency between the two signals is the output
frequency of the Model 203A.
4-5. CRYSTAL OSCILLATOR AND DIVIDER
ASSEMBLY (Al).
4-6. Assembly Al consists of a crystal controlled
oscillator and a 9:1 frequency divider. Refer to the
schematic diagram, figure 5-10, for circuit details.
4-7. CRYSTAL OSCILLATOR,
4-8. Theoscillator (A1Y l and A1Q1is a crystal con-
trolied grounded base Colpitts oscillator. The 5 Mc
output is applied through buffer amplifier A1Q2, for
isolation, to the base of the 9:1 frequency divider,
4-9. 8:1 FREQUENCY DIVIDER,
4-10. The 9:1 divider consists of a divider AlQ3 and
a tank circuit which consists of A1C8, A1C9, AICA11,
and A1L2, The divider is basically a class C grounded
base Colpitts oscillator. a
4-11. Two things occur during each cycle of the divi-
der operation, One is amplitude modulation of the
Signal applied to the base of A1Q3, and the second is a
MIXING action within A1Q3. Each function occurs at
G1760-9
à different time during each cycle of oscillation and
together tendto synchronize A1Q3 with a sub-mulitiple
frequency of the frequency applied to the base ofthe
divider,
4-12. Divider A1Q3 operates in the region of voltage
saturation for a portion of each cycle, During the
saturation period, the impedance between the base and
collector of A1Q3 becomes very low; for the rest of
eycle the impedance betweenthe base and collector is
relatively high. The variation in impedance between
base and collector of A1Q3 results in amplitude mod-
ulation (about 10%) of the signal on the base of the
divider. This amplitude modulation creates sidebands
at the 8th and 10th harmonic of the divider oscillating
frequency.
4-13. The signal applied to the base of A1Q3 is about
4. 985 Mc which is generated by the crystal oscillator
circuit. The tank circuit of the 9:1 divider is tuned
so that AIQ3 is oscillating at the 9th sub-multiple
frequency of 4. 995 Mc (555 ke).
4-14, The mixing-process within A1Q3 occurs at the
time during eachcycle when the divider just starts to
conduct. During this short time, the 8th and 10th
harmonic of the 555 kc signal are mixed with the 9th
harmonic resulting in a frequency component at 555 ke
which influences the oscillations of A1Q3. The result
1s that A1Q3 stays synchronized to the 9th sub-har-
monic of 4,995 Mc.
4-15. The pi type tank circuit filters out harmonic
frequencies which may be present at the collector of
AlQ3. A buffer amplifier A1Q4 provides further
filtering, isolation, and power gain. The output of
the 9:1 divider is a 555 kc signal and is coupled by
A1T2 to A2Q1 and A2Q2 (see figures 5-10 and 5-12),
4-16. VARIABLE PHASE SHIFTER ASSEMBLY.
4-17. The variable phase shifter assembly A25
(figure 5-12) is a goniometer consisting of two stator
windings, a rotor winding, and associated circuits,
The goniometer requires two 555 kc input signals: one
- from A2Q2 toone of the stator windings, and the other
from A2Q1 and the 90° phase shift network tothe other
stator winding. The output phase corresponds to the
angle of the rotor winding (PHASE LAG control). The
phase can be continuously adjusted from 0 through
360° with respect to the reference signal while
maintaining a constant amplitude, The adjustable
phase shifter output is applied to the RF amplifier
assembly A2 (figure 5-12).
4-18. RF AMPLIFIERS {A2).
4-19. The RF amplifier assembly A2 consists of
two RF amplifiers; A2Q3, A2Q4, and A2Q5 for the
reference phase channel and A2Q6 through A2Q9 for
4-1
Section IV
Paragraphs 4-20 to 4-30
the variable phase channel. Refer to the schematic
diagram (figure 5-12) for circuit details.
4-20. VARIABLE PHASE CHANNEL RF
AMPLIFIER,
4-21. The signal from the variable phase shifter
is amplifiedby A2Q6 then applied to the base of A2QT.
A2Q7 and A2QB8 act as an over-driven amplifier which
amplifies and clips the signal applied to the base of
A2Q7; this operation produces a square wave of cur-
rent at the collector of A2Q8, The zero crossing of
the square wave of current coincides with the zero
crossing of the sine wave signal applied to the base of
A2Q7 so that the phase of the applied signal is pre-
served. A tuned network, formed by A2C24, A2C25,
A2C29, A2C30, A2L7, and A2T2 filters the 555 ke
square-current waveform toa nearly pure sine wave,
4.22. The output of the RF amplifier circuit, which
is taken across A2C30, is maintained at a constant
amplitude by the level controlling circuit. If the out-
put should increase, the voltage at A2C2T increases,
resulting in a voltage increase at the base of A2Q8.
This increase is applied to the bases of A2Q7 and
A2Q8 which then conduct less average current. When
A2Q8 conducts less the signal at its collector de-
decreases and the output voltage decreases opposing
the original change. The result is that the amplitude
of the output remains nearly constant despite vari-
ations in the amplitude of the input signal. The out-
put signal is then applied to A3T4 in the modulator
assembly A3 (figure 5-16).
4-23, REFERENCE PHASE CHANNEL RF
AMPLIFIER,
4-24. The signal present at the emitter of A2Q2is
applied to the reference phase channel RF amplifier
section, AZQ3 through A2Q5. This stage operates
Model 203A
the same as the variable phase channel RF amplifier
described in paragraph 4-20. The output signal is
then applied to A3T3 in the modulator assembly A3 7
(figure 5-16).
4-25, VARIABLE FREQUENCY
OSCILLATOR (AIO).
4-26. The variable frequency oscillator assembly
Al0 generates a signal that is variable from 495 ke to
950 ke by rotation of the front panel FREQUENCY dial.
The FREQUENCY dial is calibrated so that with the
dial set at 5 the VFO is oscillating at 550 ke and with
the dial set at 60 the VFO is oscillating at 4985 ke. The
Output signal from the variable frequency oscillatoris
applied to the 1 K position of the MULTIPLIER {ire-
quency range} switchandalso to the 1st decade module,
Refer to the schematic diagram, figure 5-14, for
circuit details,
4-27. DECADE MODULES (Al11-A16).
4-28. The six decade module assemblies All thru
Al6 each consist of a mixer, a bandpass filter, and a
16:1 divider. These decades produce a band of high
frequency signals that are mixed in the modulators {A3)
with the 555 kc fixed frequency signal from the RF
amplifiers to produce a signal in the 6,005 cps to 60
ke range (refer to paragraph 1-5 for options). Refer
to the schematic diagram, figure 5-14and figure 4-1
for circuit details.
4-29. DECADE MODULE (A11).
4-30. The 4,995 Mc signalfrom the crystalosciliator
is applied to the emitter of A1lQ! isolation stage and
subsequently appears across the primaryofAliTIi, The
signal from A11T1isappliedto asuppressed carrier,
balanced modulator, The 495 k¢ VFO signal (assume
FROM
VFO
у
495KC
=
x
AI IST DÉCADE MODULE
TO 1K POSITION OF
“ MULTIPLIER SWITCH SIB
SIX DECADE MODULES.
INTERCHANGEABLE.
| MIXER BP FILTER 10:1 ;
| 1 (5.4-5,6M0) | 549KC _ TO 100 POSITION OF
4.995MC > Pl C9,CI0, » DIVIDER ‘ ® MULTIPLIER SWITCH SIB
Qi a Ti В Q3
TP
5490MC
| |
не пене нони <= = |
Y Y
TO MIXER IN 2ND TO MIXER IN
THROUGH 6TH x 2ND DECADE
DECADE MODULES | THE INSTRUMENT CONTAINS MODULE (Al2)
ALL ARE IDENTICAL AND
ZO3A-M-> IBA
Figure 4-1, Circuit Details
4.2
01760-3
Model 203A
that the FREQUENCY dialis at 60 and the VFO signal
is 495 kc) is applied tothe other input of the balanced
modulator. Both signals are mixed, and the sum and
difference of these two frequencies will appear at the
output. The signal from the balanced modulator is
passed through an LC filter network which is tuned
for a band-pass of from 5.4 Mc to 5. 6 Mc, which only
allows the sum frequencyto pass ontothe 10:1 divider
Al1Q3. The 10:1 divider is similar to the 9:1 divider
described in paragraph 4-9; the main difference being
that the tuned tank circuit in the 10-1 divider is adi-
usted so that the stage provides an exact 10:1 division
of the input frequency. The resultant frequency is fed
to the 100 position of the FREQUENCY MULTIPLIER
switch and to the mixer in the second decade module
А12. |
4-31, DECADE MODULES, A12 THROUGH A16,
4-32. The action within the succeeding decade mod-
ules is the same as that described for the first decade
module All. The output of each module is applied to
a position of the FREQUENCY MULTIPLIER switch
and to the mixer in the following decade module. Thus
a set of variable frequency signals are produced and
when mixed with the constant high-frequency signal in
the modulator (A3) a beat frequency is produced. The
- beat frequency is decreased bya factor of 10 for each
lower range of the FREQUENCY MULTIPLIER switeh.
4-33. MODULATOR ASSEMBLY, A3.
4-34. The Modulator assembly A3 consists of a mod-
tlator drive amplifier andtwo balanced switching type
modulators; one for the REFERENCE PHASE channel,
andthe other for the VARIABLE PHASE channel. Refer
to the schematic diagram, figure 5-16, for details.
4-35. MODULATOR DRIVER AMPLIFIER,
4-36. The frequency selected by the FREQUENCY
dial and the FREQUENCY MULTIPLIER is applied to
the input of the modulator driver amplifier A3Q1 where
it is amplified and applied to A3Q2 and A3Q3. A3Q2
and A3Q3 actas anover driven amplifier which ampli
fies and clips the signal applied to the base of A3Q2,
This operation produces a square wave output at the
collector of A3Q3 which is applied to the modulator
section as a switching signal,
4-37, REFERENCE PHASE CHANNEL
MODULATOR.
4-38. The modulator driving signal (VFO) anddecade
output) is applied to the bases of the switching trans-
1stors (A3Q5 thru A3Q8). The fixed frequency, a 555
ke sine wave, is appliedthrough series resistors fo the
emitters of the Switching transistors. The output at
the collectors is sine wave of the sum and difference
frequencies. This signal is applied to the low pass
fiiter assembly A4 (figure 5-18), The filter DASSES
only the difference frequency, the output is a sine
Wave having a frequency thatis between 0.005 cps and
S0 kc depending on the position of the FREQUENCY
MULTIPLIER switch andthe FREQUENCY dial setting
01760-2
Section IV
Paragraphs 4-31 to 4-51
(refer to paragraph 1-5 for Options). The output signal
is applied to the dc amplifier A6.
4-39, À dc reference voltage is derived by summing
the signals at the collectors of A3Q5 and A3Q6. This
de reference voltage is used as a reference voltage
for the differential amplifier in the dc amplifier as-
sembly AS.
4-40. VARIABLE PHASE CHANNEL
MODULATOR, |
4-41. The variable phase channel modulator operates
the same as the reference phase channel described in
paragraph 4-37, except that the output is applied to
the Low Pass Filter A5 and then to the de amplifier
AT,
4-42. DC AMPLIFIER ASSEMBLIES
A6 AND A7.
4-43. After passing through the low pass filter the
signal is fed to the direct coupled amplifiers; A6 for
the reference phase channel, and A7 for the variable
phase channel. Refer to the schematic diagrams fip-
ures 5-18 and 5-20 for circuit details.
4-44, REFERENCE PHASE CHANNEL DC
AMPLIFIER ASSEMBLY.
4-45. The dc amplifier usesa differential amplifier
for the input stage, The de reference voltage from
the modulator section is used as the reference input
for the differential amplifier. This configuration
minimizes any tendency of dc drift due to power
supply temperature variations. The de amplifier
circuit uses negative feedback to provide for low dis.
tortion amplification. The outpui is appiled to a
bridged-T type attenuator and the square wave gene-
rator AB.
4-46, VARIABLE PHASE CHANNEL DC AMPLIFIFR
ASSEMBLY.
4-47. The variable phase channel de amplifier oner-
ates the same as the reference phase channel des-
cribed in paragraph 4-44, except thai the Output is
appiied to bridged-T type attenuator and the square
wave generator, A9.
4-48. SQUARE WAVE AMPLIFIER
ASSEMBLIES A8 AND A9.
4-49, The output sine wave from the de amplifier
is applied to a square wave generator section, AB,
for the REFERENCE PHASE channel, and A9 for the
VARIABLE PHASE channel. Refer to the schematic
diagrams, figures 5-18 and 5-20, for circuit details.
4-50, REFERENCE PHASE CHANNEL SQUARE
WAVE GENERATOR,
4-51. The sinewave from the de amplifier is ampli-
fied by A8Q1 then applied to the base of A8Q2. A8Q2
and A8Q3 actas anoverdrivenamplifier whichampli-
4-3
Section IV
Paragraphs 4-52 to 4-57
fies and clips the signal applied to the base of A8Q2,
and produces a square wave at the collector of A8Q3.
This square wave is applied to A8Q4 and A8Q5 which
form a Schmitt trigger circuit. The Schmitt trigger
is a regenerative circuit which changes states abruptly
when the input signal ¢rosses a specific dc triggering
level. The output {rom this stage is a square wave
having a rise time of less than 0. 2 microsecond with
the same frequency and phase as the sine wave signal
applied to the circuit. The output is applied to a
bridged~T attenuator,
4-52. VARIABLE PHASE CHANNEL SQUARE WAVE
GENERATOR.
4-53. The variable phase channel square wave gen-
erator operates the same as the reference phase
channel described in paragraph 4-50.
4-4
Model 203A
4-54. DC POWER SUPPLY A21, A22.
4-55, The dc power supply provides regulated +15,
~15, and -24. 5 volts and unregulated +35 volts.
4-56. CALIBRATION FEATURE.
4-57, A quick check for calibration of the frequency
dial isa comparison between instrument and line fre-
quency. The FREQUENCY dial is set to 6 (CAL) and
the FREQUENCY MULTIPLIER is settothe CAL posi-
tion. Through SIBR a 60 cycle output {rom All is
applied to the pilot light which will mix with the 60
cycle line frequency. The pilot light will flicker at
the difference or beat rate. This rate may be adjusted
to minimum by the CAL ADJ control which slightly
affects the VFO frequency. Ata minimum rate of
flicker the instrument's 60 cycle frequency will be
most nearly like the 60 cycle line frequency. For
checking the exact frequencies throughout the ranges
see paragraph 5-5 Frequency Dial Calibration.
01760-2
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Model 203A Section V
Paragraphs 5-1 to 5-5
Table 5-1
SECTION V
MAINTENANCE
5-1. REQUIRED TEST EQUIPMENT.
5-2. Recommended test equipment for trouble-
shooting and performance checking is listed in table
oi. Test instruments other than those listed may
be used if their specifications equal or exceed the
required characteristics.
5-3. PERFORMANCE CHECKS.
5-4, Use the following front panel procedures to
verify proper operation of the & Model 203A. The
Model 203A and test equipment should be operated at
115/230 vac unless otherwise specified. If the Model
203A is not within specifications at any point in
this procedure, refer to paragraph 5-12, ADJUST-
MENTS,
Table 5-1.
9-5, FREQUENCY DIAL CALIBRATION,
a. Push Model 203A LINE switch ON. Pilot light
should glow,
b, Set FREQUENCY dial
PIJER switch to CAL.
¢. Adjust front panel CAL ADJ until visualzero
beat is obtained on front panel pilot light, This occurs
when flashing rate of the pilot light approaches zero.
to 6 (CAL); MULTI-
d. Connect Model 203A as shown in figure 5-1 .
e. Rotate FREQUENCY dial and observe Elec.
tronic Counter readings at points shown in table 5-2;
counter readings should be within limits shown. At
frequencies below 100 cps use period measurements.
Rec iired Test Equipment
Instrument Type
Required Characteristics
Use
Recommended Model
DC Voitmeter
Voltage Range: O - 50 volts
Input Impedance > 10 M ohms
Accuracy: +1%
Performance Checks
AC Voltmeter
Voltage Range: 1 mv ~ 100 v
Freq. Response: to 600 ke
Accuracy: 2%
Performance Checks
® Моде! 403В
or
% Model 400D/H/L
Oscilloscope
Bandwidth: DC - 5 me
Waveform Checking
#4. Model 175A with
ti Model 1780A Hori-
zontal Plug-In
& Model 1750A Verti-
cal Plug-In
# Model 10003 A
10:1 Probe
Frequency Counter
Range: 0,005 cps - 60 ke
Performance Checks
% Model 523C
Distortion Analyzer
Range: 3 cps to 60 ke
Performance Checks
% Model 331A
Variable Transformer
Output Voltage: 103 - 127 vac
Performance Chocks
Powerstat
6 pin printed board
extender
Troubleshooting
Adjustment
@ #5060-0651
15 pin printed board
Troubleshooting
% #5060-0047
extender Adjustment
Thermal 500 45 VAC input, 7.0 mv Frequency Response > Model 11051 A
Converter DC output +0. 2%
> cps - 60 ke
Nylon Tuning Wand Adjustment ú 48730-0016
Soldering Iron and 50 watts Troubleshooting Ungar Neo. 776 handle
Tips Tip Temperature: 800 F Repair with Ungar No, PL333
Tip Size: 1/16" - 3/32" tiplet and Ungar No.
Round Tip Dia: 3/4" 885 3/4" cups tip
01760-3 5-1
Section V
Paragraph 5-6
Figures 5-1 and 5-2
Model 203A
®203A
VARIABLE PHASE
FUNCTION GENERATOR
à JO © JO
о
REFERENCE
PHASE
QUTPUT
ELECTRONIC COUNTER
9 523C
203A-M—- 104
Figure 5-1.
counter reading.
5-6. FREQUENCY RESPONSE,
a. Set Model 203A controls as follows:
Frequency Dial Calibration
This table can be used at all MULTIPLIER switch
settings by changing the decimal point of the given
INSURETHAT ALL FOUR AMPLITUDE CON-
TROLS ARE FULLY COUNTERCLOCKWISE
TO AVOID DAMAGE TO THE THERMAL
CONVERTER.
b. Connect Model 203A as shown in figure 5-2,
FREQUENCY LL 1415401000 10 using very short leads between the Model 203A and
MULTIPLIER. 2 114444 4 + 44 4 100 Thermal Converter,
DC VOLTMETER
®412А
f y
$203A MEN
VARIABLE PHASE
FUNCTION GENERATOR
O 00 › (5) JO o
of lo о о o 90
REFERENCE A —
OUTPUT POTEET ®HOSIA
A?
$4038
9 O
AC VOLTMETER
eur
. — OUTPUT
S BNC-TO-BINDING POST
| ADAPTER
О ФЮНА
СОЗА-НМ-НА
Figure 5-2,
5-2
Frequency Response
01760-2
с
Model 203A Section V
Paragraph 5-7
Table 5-2
à
Table 5-2, Frequency Dial Calibration
FREQUENCY Dial Counter Period Measurement Counter Frequency Measurement
{below 100 cns) (above 100 cps)
Minimum Maximum Minimum Maximum
5 1989 2020 495 205
6 1650 1684 594 606
7 1415 1443 693 107
8 1238 1263 793 808
9 1100 1122 891 909
10 990 1010 990 1010
12 825 841 1188 | 1212
14 707 121 1386 | 1414
17 582 094 1683 1717
20 495 505 1980 2020
25 396 404 2475 2525
30 - 330 336 2970 3030
40 247 253 3960 4040
50 198 202 4950 5050
60 165 189 5940 6060
CAUTION 4
DO NOT EXCEED 7. 5MILLIVOLT OUTPUT
AS THE THERMAL CONVERTER IS VERY
EASILY DAMAGED BY EXCESSIVE INPUT
VOLTAGE,
с. Set REFERENCE PHASE ~ OUTPUT for a
reading of 4. 9 vac on the ac voltmeter,
d. Disconnect AC Voltmeter.
e. Slowly adjust REFERENCE PHASE ~ OUTPUT
for de voltmeter reading of 7. 0 millivolts.
01760-2
f. Vary Model 203A FREQUENCY from 5 ¢ps to
60 kc,
g. DC voltmeter reading should stay between 6. 86
and 7. 14 millivolts,
h. Repeat steps b thru g for VARIABLE PHASE
OUTPUT.
i. Disconnect resistor, thermal converter and
de voitmeter,
9-7. SINE WAVE CHECK,
a. Connect Model 203A as shown in figure 5-3.
5-3
Section V | | Model 203A
Figures 5-3 and 5-4
DISTORTION ANALYZER
4 33iA
$P203A 7
VARIABLE PHASE o
FUNCTION GENERATOR 6 7 > a“
‚© ©
a
о) © DO © OD 3 Оо © о 9
> Е оо
9% |© ос | |
REFERENCE
PHASE
QUTPUT |
203A-M-IZA
$6000 I1/2W 1%
1 0727-008
AC VOLTMETER
t 4038
О © |
s
— INPUT
Figure 2-3. Sine Wave Check
b, Set Model 203A controls as follows: d. Using Distortion Analyzer, check total har-
monic distortion present on signal. Distortion level
FREQUENCY ............... 10 should be more than 64 db (0.06%) below fundamental
MULTIPLIER . 2 42 44 4 4 4 7 100 frequency reference level.
~ AMPLITUDE {2} . 1... 44240. both CW e. Repeat step d at a number of {requencies be-
tween 5 cps and 60 Кс.
с. AC Voltmeter should read at least 5.3 volts f. Repeat steps a through e for VARIABLE
rms, PHASE ~ QUTPUT.
50 MC OSCILLOSCOPE
175A
о
o о © ó -
VARIABLE PHASE © | 5
FUNCTION GENERATOR о ©
= tTROA
О ое (©) DO | INPUT
O о Gun 90
9/94 оо 1780A {
REFERENCE / » —10:1 PROBE
Math 6000 М? Y |
OUTPUT $ T7 М2 М 1% 203A-M-I3A
7) 0727-0081 —
Figure 5-4, Square Wave Check
5-4 | 01760-3
Model 203A
Section V
Paragraphs 5-8 to 5-9
P203A
VARIABLE PHASE
FUNCTION GENERATOR
OS
oo Ip
START
Figure 5-5
ELECTRONIC COUNTER
REFERENCE
PHASE INPUT
OUTPUT
®523C
O
| |
O
9 SS © ©
AS Is © ©
| | STOP
INPUT
J 203A-M.14A
VARIABLE /
PHASE OUTPUT
Figure 5-5, Phase Lag Check
9-8. SQUARE WAVE CHECK,
a. Connect Model 203A as shown in figure 5-4 .
b. Set instrument controls as follows:
Model 203 A
FREQUENCY . ... aan 10
MULTIPLIER . .... e... 100
'LAMPLITUDE (2)... ....... both CW
Oscilloscope
INPUT. L 11211 1 4 LV LL LL LS DC
SENSITIVITY . . ......... .5 V/CM
SWEEPTIME . ........ 1 MSEC/CM
TRIGGER SOURCE . . ......... INT
TRIGGER SLOPE . . 122.14 4110 (+)
c. Adjust Model 203A FREQUENCY dial sothat
one cycle of square wave fills exactly 10 em of hori-
zontal deflection,
d. Zero crossing of square wave should occur
between 4,8 and 5.2 cm from start of sweep. Peak-
to-peak voltage should be at least 15 volts,
e. SetOscilloscope SENSITIVITY to. 5v/cm. Ad-
just VERTICAL POSITION to bring first, the top of
the square wave into view, then the bottom of the
square wave.
f. Overshoot should not be more than 5% of the
amplitude (1, 5 em),
g. Set Oscilloscope SWEEP TIME to. 1 uSEC/CM;
SENSITIVITY to . 5 V/CM.
01760-2
В. Square wave rise time should be less than 0. 2
usec from 10% to 90% points.
J. Set Oscilloscope TRIGGER SLOPE to (-).
K. Square wave fall time should be less than. 2 |
usec from 10% to 90% points,
m. Repeatsteps b thru k at various frequencies Gi.
all ranges,
n. Repeat steps a thru m for VARIABLE PHASE
Ms OUTPUT,
5-9. PHASE LAG CHECK,
a. Connect Model 203A as shown in figure 5-1.
5. Set instrument controls as follows:
Model 203A
MULTIPLIER . 444 4 444 4 4 4 4 110 10
FREQUENCY .,. .. .. approximately 27
~ AMPLITUDE . , ......... both CW
Electronic Counter
FUNCTION SELECTOR . . . . PERIOD
STD, FREQ, COUNTED . .., ..... 1 MC
с. Adjust Model 203A FREQUENCY dial for
— Electronic Counter reading of 3600,
d. Connect Model 203A as shown in figure 5-35,
€, Set Electronic Counter controls as follows:
FUNCTION . ....... TIME INTERVAL
TRIGGER INPUT . . . . SEP
TRIGGER SLOPE, . .... . . .. both (+)
Section V
Paragraphs 5-10 to 5.15
Table 5-3
f. Set Model 203A PHASE LAG dial to 180%
g. Adjust Electronic Counter TRIGGER LEVEL
controls for stable reading near 1800.
h. Check Electronic Counter readings at 30°
increments on PHASE LAG dial. Readings shouldbe
within the values shown in table 5-3.
Table 5-3. Phase Lag Check
PHASE LAG ELECTRONIC COUNTER
Minimum Maximum
0 3550 50
30 | 250 350
60 550 650
90 850 950
120 | 1156 1250
150 1450 1550
180 1750 1850
210 2050 2150
240 2350 2350
270 2650 2750
300 2950 3050
330 3250 3350
5-10. INSTRUMENT COVER REMOVAL.
5-11. To remove either the top or bottom covers,
unscrew and remove the two counter-sunk Phillips-
head screws which secure the coverto the instrument.
Then slide the cover towardthe rear of the instrument.
To replace the cover, reverse the procedure.
5-12. ADJUSTMENTS.
5-13. The following test andadjustment procedures
should be performed only if it has been definitely
determined by the Performance Checks given in
paragraphs 5-5 thru 5-89 that the Model 203A is out
of adjustment.
5-14. POWER SUPPLY A22 ADJUSTMENTS,
Note
Make the following adjustments with FRE -
QUENCY MULTIPLIER switch in X 100
position.
a. Supply Model 203A primary power from Vari-
able Transformer,
b. Set line voltage to nominal value (115 volts),
с. Connect DC Voltmeter and AC Voltmeter tc
A22 (5). (See figure 5-21.)
d. Adjust A22R12 (-15 volt adjust) for DC Volt-
meter reading of ~15.1 vde. AC Voltmeter should
read less than 1. 0 mv ripple.
e. Vary line voltage from 103 to 127 vac. DC
Voltmeter reading should not change more than +0. 2
vac.
f. Connect DC Voltmeter and AC Voltmeter to
A22 (13).
о, Adjust A22R20 (+15 volt adjust) for DC Volt-
meter reading of +15, 1 dec. The AC Volimeter should
read less than 1.0 mv ripple.
5-6
Model 203A
В. Vary line voltage from 103 to 127 vac. DC
Voltmeter reading should not change more than 0,2
vdc,
ji. Connect DC Voltmeter and AC Voltmeter to
A22 (2).
k. AC Voltmeter should read less than 2.0 mv
ripple, DC Voltmeter should read „24.5 +0.5 vde,
Note
It may be possible to bring the -24, 5 voit
Supply into specifications by aslight adjust-
ment of the -15 volt adiust (A22R12), The
-15 volt supply must stay between -14,9
and -15.3 vde,
m. Vary line voltage from 103 fo 127 vac. DC
Voltmeter reading should not change more than +0,4
vdc.
Connect DC Voltmeter to A22 (14).
DC Voltmeter should read +35 +5 хас.
Disconnect front panel shorting bar,
MDP
Connect AC Voltmeter between chassis ground
and circuit common A22 (9).
5. Use an insulated tuning wand to adjust A21C1
(located on bottom of chassis) for a minimum reading
(refer to figure 5-8).
5-15. 4,995 MC OSCILLATOR AND 9:1 DIVIDER
(Al) ADJUSTMENT.
a. Connect 10:1 probe of Oscilloscope to base of
AlQ3 and ground lead to ground plane of oscillator
board, (See figure 5-9.)
b. Set Oscilloscope controls as follows:
INPUT LL 4 4 4444 44 4 4 4 4 4 44 2 0 AC
SENSITIVITY . .......... .05 V/CM
SWEEP TIME 2 22 4 4 4444 4 2 uSEC/CM
с. Adjust AIT] for maximumamplitude of 5 me
signal.
d. Move 10:1 probe to emitter of AIQ3,
e, Adjust A1L2 for eleven waveforms in 10 cm of
horizontal deflection, Adjust AlL2 so that the first
pip of signal is slightly larger than the rest (see fig.
ure 5-7, Waveforms 3 - 3).
f. Repeat steps athru e untiloptimum adjustment
is obtained,
g. Move probe to Al (5).
h. Adjust A1T2 for maximum amplitude of 355 ke
signal.
1760-3
=
Model 203A
5-16. ADJUSTABLE PHASE SHIFTER (A25)
ADJUSTMENT.
Note
The following procedure must be performed
with printed board A2 in its normal operating
position in the Model 203A. Do not use an
extender board,
a. Connect AC Voltmeter across output of Phase
Shifter Assembly (A25) using short unshielded leads
(see figure 5-8),
b. While rotating PHASE LAG dial through 360°
alternately adjust A2C1 (see figure 5-11) and A25C1
until voltage level indicated on AC Voltmeter remains
with +3% of nominal signal level obtained.
5-17. RF AMPLIFIER ADJUSTMENT (A2).
a. Connect DC Voltmeter tothe collector of A2Q3:
connect 10:1 Oscilloscope probe to collector of A2Q4.
(See figure 5-11.)
b. Adjust А21,3 for maximum DC Voltmeter
reading.
¢. Adjust A2T1for minimum AC voltage indication
on Oscilloscope.
d. Repeat steps b and c as many times as neces-
sary for optimum adjustment,
e. Connect DC Voltmeter to collector of A2Q7:
connect 10:1 Oscilloscope probe to collector of A2Q8.
f. Adjust A2LT for maximum DC Voltmeter read-
ing,
g. Adjust A2T2 for minimum AC Voltage indication
on Oscilloscope.
h. Repeat steps f and gas many times as necessary
for optimum adjustment,
5-18. DECADE MODULE All ADJUSTMENT.
Note
Each of the six Decade Modules, A11 through
Al6 are electrically identical. Each module
should be adjusted in the 1K position of the
range switch for best results. All components
are referred to by their location on the mod-
ule. For example, Llis Al1L1, A12L1, A13L1,
etc. depending upon the particular module
under test. Module All procedure is given
Separately because of its wide frequency
range.
a. Connect a 10:1 Oscilloscope probe to the junction
of CRI and CR2 (see figure 5-13b) and see the controls
as follows:
SENSITIVITY .02v/em
SWEEP TIME 2 usec/em
TRIGGER SOURCE INT
01760-3
Section V
Paragraphs 5-16 to 5-18
b. Set the frequency dial to 5 and the range
switch to IK.
c. Adjust Tl and L1 for maximum amplitude
the 5 mc signal.
Note
L1 may have two peaks. The correct position
of the slug is the second peak in the clockwise
direction. The wrong position of the slug will
be noted by a sawtooth waveform.
d. Move the 10:1 Oscilloscope probe to the base of
Q3 and change the vertical sensitivity to . 05v/cm.
e. Adjust T2 for maximum amplitude of the 5 mc
signal.
f. Move the 10:1 Oscilloscope probe to the emitter
of Q3.
g. Adjust L2for eleven complete cycles in 10 cm
of horizontal deflection. (See figure 5-7, waveform
12.)
h. Move the 10:1 Oscilloscope probe to the base
of Q3.
LL Rotate the frequency dial slowly to the high
end. The amplitude of the 5 mc signal should not
fall below 1 cm (. 5v p-p. )
j. If the signal at the high end of the dial is 16
low in amplitude, turn L1 slug counterclockwise
. until 1 em of amplitude is obtained. Rotate the fre-
quency dial from the high end to the low end and
stagger tune Li and Tl as necessary in order to
maintain at least 1 em of amplitude over the entire
range.
kK. Movethe 10:1 Oscilloscope probe to the emitter
of Q3 and set the frequency dial to 5.
1. Turn L2 slug clockwise until the waveform
goes out of sync. Next turn L2 slug counterclock-
wise until the waveform just comes back into syne.
m. Rotate the frequency dial slowly toward ihe
high end until the waveform goes out of sync.
n. Turn LZ slug counterclockwise until the wave-
form just comes hack into sync.
o. Repeat steps m and n until the waveform is
synchronized while rotating the dial between the
extreme tugh and low ends,
p. Rotate the frequency dial until the first pip.
on the waveform is at maximum amplitude, 1
q. Turn LZ slug counterciockwise to reduce the
- amplitude of the first pip to one-half the amplitude noted
instepp. The bottom of the first pip will be stightiy low-
er inamplitude than any other parl of the waveform.
5-7
Section V
Paragraphs 5-19 to 5-23 and Table 5-4
5-19. MODULE A12 THROUGH Al6
ADJUSTMENTS.
a. Connect the 10:1 oscilloscope probe to the
junction of CR1 and CR2 (see figure 5-13b) and set
the controls as foliows:
SENSITIVITY .02v/em
SWEEP TIME 2 usec/em
TRIGGER SOURCE INT
| b. Set the frequency dial to any position and the
range switch to the 1X position. (The reason for
this setting is that the frequency range of these
decades is small.
с, Adjust T1 and L1 for maximum 9 me signal
(see figure 5-7, waveform 8.)
d. Move the 10:1 oscilloscope probe to the base
of Q3 and change the vertical sensitivity to . 05v/em.
e. Adjust T2 for maximum amplitude of the 5 mc
signal.
f. Move the 10:1 oscilloscope probe to the emit-
ter of Q3.
g. Adjust 1.2 for eleven complete cycles in 10 cm
of horizontal deflection,
h. Rotate L2 slug clockwise until the waveform
goes out of sync and then turn L2 counterclockwise
until the waveform just comes back into sync. Note
the amplitude of the first pip at the bottom of the
waveform. Turn L2 slug counterclockwise until the
amplitude of the first pip is reduced by one half,
5-20. FREQUENCY DIAL ADJUSTMENT.
a. Connect Model 203A as shown in figure 5-1,
Adjust the dial to a precise setting of 6.
hb. Sef MULTIPLIER switch to 1K.
c. Set 6 on the dial exactly on the period count of
1667 +2 counts. Thus the quick Calibration Feature
(paragraph 4-56) should bring the entire range into
specifications. |
d. Check each FREQUENCY dial setting listed in
table 5-2. If at any point the frequency lies outside
the specified tolerance, adjust C11 by carefully bend-
ing its outer plates until the frequency is within the
given tolerance. Check 6 on the dial again to be
sure that it is exactly on frequency.
5-21. MODULATOR {A3) ADJUSTMENT.
a. Connect DC Voltmeter to A3 (12). (See figure
5-15.) : |
b. Adjust A3R13 for minimum DC Voltmeter
reading (typically between +50 and -50 millivolts.)
с, Measure voltage at A3 {4); reading should not
exceed 250 mv.
5-8
Model 203A
5-22. DISTORTION,
a. Connect Distortion Analyzer and 600 ohm 1%
resistor, -hp- #0727-0081) to REFERENCE PHASE
~ OUTPUT terminals.
b. Set FREQUENCY dial to 5; MULTIPLIERto
1K.
с, Set PHASE LAG dial to obtain maximum dis-
tortion reading on Distortion Analyzer.
d. Adjust A3R17 for minimum distortion. (See
figure 5-15.)
e. Connect Distortion Analyzer and 600 ohm res-
istor to VARIABLE PHASE ~ QUTPUT terminals.
f. Set PHASE LAG dial to obtain maximum distor-
tion reading.
g. Adjust A3R31 for minimum distortion.
Note
Perform steps h thru r only if distortion is
greater than -64 db (0.06%) below reference
level. These steps will reduce only excess-
ive eighth and tenth harmonics.
В, Check and adjust as necessary, modules All
through AT4 according to Table 5-4. In each case a
10:1 oscilloscope probe is connected to the base of
Q3 and a minimum signal amplitude of. 5v p-p should
be maintained for proper circuit operation.
Table 5-4
MAXIMUM | IF<-84DB
MODULE | RANGE | DIAL {DISTORTION | ADJUST
All X00 v5 > -84 db Ti
All X100 50 > -64 db Li
А12 X10 5 > „64 db T1
А13 Xi 5 > »64 db T1
А14 x,1 50. > 64 db TÍ
5-23. FREQUENCY RESPONSE.
a. Connect DC Voltmeter toREFERENCE PHASE
~ QUTPUT terminals,
b. Set FREQUENCY dial to 50, MULTIPLIER to
100 and both ~ AMPLITUDE controls fully clockwise,
с, Adjust A6R8 (A7R3 for VARIABLE PHASE)
(DC Zero Adj) for minimum DC Voltmeter reading
(typically between +20 and -20 millivolts). See
figure 5-17,)
d. Disconnect DC Voltmeter.
01760-3
(
C
Model 203A
Note
Do not place DC Amplifiers (A6 and A7) on ex-
tender board.
g. SetREFERENCE PHASE ~AMPLITUDE for AC
voltmeter reading of 4, 8 vac.
1
E CAUTION3
DO NOT EXCEED 7.5 MV OUTPUT AS THER-
MAL CONVERTER ISVERY EASILY DAMAGED
BY EXCESSIVE INPUT VOLTAGE,
В, Disconnect AC Voltmeter.
i, Carefully adjust REFERENCE PHASE ~ AM-
PLITUDE for aDC Volimeter reading of 7. 0 millivolts.
К. Set Model 203A MULTIPLIER switch to 1.
m. Adjust A3R20 (A3R34 for VARIABLE PHASE)
{50 cps adj) until the DC Voltmeter reads 7.0 milli-
volts.
n. Set MULTIPLIER switch to 10. Note DC Voit-
meter reading.
р. Set MULTIPLIER switch to 1K,
q. Adjust A4R2 (A5R2 for VARIABLE PHASE)
(50 Kc adj) until DC Voltmeter reads the same as in
step j.
т, Repeat steps | thru q until readings at 50 cps,
000 cps and 50 kc are between 6.93 and 7.07 milli-
volts,
S, Repeat steps a thru r for the VARIABLE
PHASE — OUTPUT.
t. Disconnect Thermal Converter and connect
AC VTVM to REFERENCE PHASE ~ OUTPUT
terminals. Set REFERENCE PHASE ~ AMPLITUDE
fully clockwise.
u, Adjust A6R20 {ATR20 for VARIABLE PHASE)
AMP. Adj for 10. 6 volts.
Vv. Repeat steps t and u for the VARIABLE PHASE
> OUTPUT,
5-24, PHASE LAG DIAL.
a. Connect Model 203A as shown in figure 5-6.
01760-3
fully clockwise,
Section V
Paragraphs 5-24 to 5-29
MULTIPLIER
Set both ~ AMPLITUDE controls
b. Set FREQUENCY dial to 10;
switch to 100.
с, Adjust PHASE LAG dial and one (not both) of
the ~ AMPLITUDE controls for minimum reading on
AC Voltmeter, Typical reading is less than 50 mv.
d. Loosen set screws and slip PHASE LAG dial
until it reads exactly 180° at the null obtained in step
c and then tighten the set screws.
Note
If a phase error is noted at different points on
the dial, it may be necessary to slip the dial
in order to minimize any errors.
9-25. SQUARE WAVE (A8 and A9) ADJUSTMENT.
a. Connect DC Voltmeter to Model 203A REFER..
ENCE PHASE "| OUTPUT.
b. Set Model 203A controls as follows:
FREQUENCY 2 2 4 4 4 44 4 4 4 1 1 1 40 10
MULTIPLIER. 4 444 2 4 4 4 4 4 4 4 40 100
“J-/AMPLITUDE .. 24444 4420 both CW
¢. Adjust A8RS for a minimum reading onde volt-
meter (typically between +50 and -50 millivolts), (See
figure 5-17.)
d, Connect dc voltmeter to VARIABLE PHASE
OUTPUT.
e, Adjust A9R9 for a minimum reading on de
voltmeter (typically between +50 and -50 millivolts).
5-26. TROUBLESHOOTING.
5-27. To locate trouble in the Model 203A, start
with a thorough visual inspection of the instrument.
Look for burned out or loose components and con-
nections, and other similar conditions which suggest
a source of trouble, For further aid introubleshoot-
ing use Model 203A Block Diagram {figure 4-1),
Purpose for Factory Selecled Values {fable 5-5),
Troubleshooting Summary (table 5- 6), and Typical
Waveforms {figure 5-7).
5-28. PRINTED CIRCUIT BOARD REPAIR.
5-29. The Model 203A uses plated through double:
sided etched circuit boards.
9-3
Section V | Model 203A
Paragraph 30
Figure 5-6 and Table 5-5
W203A
5 A
VARIABLE PHASE С ea En
FUNCTION GENERATOR
|
J oo JO
© o ON
97
7 37 6000 1/2 W 1% {2)
; < 0727-0081
A AA
\
205A—M-IGA
Figure 5-6. Phase Lag Dial Adjustment
5-30. Observe the following rules when repairing С,
To remove a damaged component, clip com-
double-sided etched circuit boards.
ponent leads near the component; then apply heat and
remove each lead with a straight upward motion.
a. Solder from the conductor side of the etched
d. Usea speciaitoo! to remove components having
circuit board,
multiple connections, such as potentiometers, etc.
Refer to table 5-1 for type of soldering tip required.
b. Avoid applying excessive heat when soldering e.
Use a toothpick to free hole of solder before
on the circuit board.
installing a new component,
Table 5-5. Purpose of Factory Selected Values
A2C2* To provide proper range for A2C1. {Adjust only if A25, A201 or A2Q2 are
changed.)
A2CT* To provide proper amplitude for 909 A25 drive. (Adjust only if A25, A2Q1
| or A2Q2 are changed.)
A2C11* To provide proper amplitude for 00 A25 drive. {Adjust only A25, A2Q1 or
A2Q2 are changed.)
A3R5* Value very seldom changed. Adjust drive amplitude for A3Q2.
A21C2* To provide common ground isolation,
A22C2* To eliminate H. ¥. oscillations on the -24, 5 volt de supply.
A22C12* To eliminate H, F. oscillations on the -15 volt dec supply.
С12* Do not change unless absolutely necessary! Coarse adjustment for 5 ke.
5-10
01760-3
Model 203A ВЕ Section V
Table 5-6
Table 5-6, Troubleshooting Summary
Symptoms Possible Cause
Check: VFO output at XA10 pins 4 and 6 (X1K range).
If no output, check 555 kKc output XA1 pins 5 and 6.
If no output at (2), check 4. 995 Mc output XA1 pin 1,
Check power supply voltages and continuity between circuit ground
and chassis. If output is at (2) but not at €) check:
a. Al0Li L2 for open.
b. A10CI11, C15 for short.
c. A10C5, C8 for open,
If output is at 3 but not at @), check:
a. Open windings in AITI, T2 or Là.
b. Low beta of AlQ3 or Q4,
If no output at (3), check: (4)and crystal Y1, transistor A1Q1
1. No output on any channel
BEE
>
2. Output on one channel only
(sine and square)
Check: output at pins 2 and 4 of XA6 or XA",
If no output, check pins 12 or 4 of XA3.
If output is at (2) but not а), check:
a. A4 or A5 at pin 6 then pin 1.
@O9@|©
b. Li, L2 or L3 might have case grounded.
(4) If output is at (3) but not at pin 4 of XA3, check:
a. A3Q9, T2, T4 for open.
b, Misadiustment of A3R31 or R34,
If output is at (3) but not at pin 12 of XA3, check:
a. A3Q4, T1 or T3 for open.
b, Misadiustment of A3R17 or R20.
©
3. No square wave output Check: Input pin 1 of XA8 or XAS,
If no signal, check output pin 2 о? ХАб ог ХАТ,
If signal is at Q), check output pin 6 of XAB or XAG,
If signal is at 1) but not (3), check:
a. ABQS5, Q4 or CRI for open.
b. A9Q5, Q4 or CRI for open.
CCOO
Check: output of RF Amplifier pin 7 of XA2,
If no signal at (1) check input pin 4 of XA2.
if no signal at 2), check pins à and 14 of XAZ,
@ If output is at (3) but not at 2), check components in A25.
(5) If no output at (1) no output at ©), check companents listed
under second symptom.
4. No output on variable channel
(sine and square)
OO |
5. High Distortion on one (1) Adjust Decade Divider for that range. Use procedure in
frequency range paragraph 5-18/5-19
6. Distortion on REF Sine OUT- | (1) Defective A2Q1 or A2Q2.
PUT varies as PHASE LAG
dial is rotated
01760-3 5-11
Section V | Model 203A
Figure 5-7
I~ Al {1) 5 mc output | — 4- AlQ3 Emitter
.5 Y/CM; .2 uSEC/CM AlL2 minimum for synchronization
.5 V/CM; .5 uSEC/CM -
2 - AlQ3 Base 5- AlQ3 Emitter
.5 YV/CM; 2 ¡SEC/CM A1L2 nominal
5 V/CM; .5 uSEC/CM
3- A1Q3 Emitter | 6- A2 (11) RF Amp Output
AlL2 maximum for synchronization 1 V/CM; 1 uSEC/CM
‚5 V/CM; .5 uSEC/CM
Figure 5-7. Typical Waveforms {Page 1 of 3)
3-12 01760-2
Section V
Figure 5-7 (Cont'd)
Model 203A
tter
Al11Q3 Emi
10
A10 (6) VFO Output
,5 V/CM
7
lon
Е
E
1Za
for synchron
о uSEC/CM
mum
à V/CM
LZ max
2 uSEC/CM
*
itter
Al103 Em
1.2 min
11
All-Junction CRI and CR?
1 uSEC/CM
8-
Zation
imum for synchroni
.5 uSEC/CM
.5 Y/CM
5 V/CM;
*
»
tter
A11@3 Emi
L2 nom
12~
A11Q3 Base
9.
inal
à V/CM
2 uSEC/CM
4
¥
à V/CM
à uSEC/CM
*
+
ical Waveforms (Page 2 of 3)
Typi
Figure 3-7,
5-13
61760-2
Section V | Model 203A
Figure 5-7 (Cont'd)
ATA
13- A11Q3 Emitter | > 16- A3 (12) Modulator Output
Incorrect Frequency Division FREQUENCY - 5 ke
15 V/CM; 2 ySEC/CM .5 V/CM; .1 MSEC/CM
i4- A3Q3 Collector 17- A3 (12) Modulator Output
,5 V/CM; .5 uSEC/CM FREQUENCY - 5 ke
.5 V/CM; 1 uSEC/CM
15- A3Q5 Base | 18- ABQ4 Collector
.5 V/CM; .5 uSEC/CM FREQUENCY - 1 kc
5V/CM; .2 uSEC/CM
Figure 5-7. Typical Waveforms (Page 3 of 3)
5-14 01760-2
Section V
Figure 5-8
Model 203A
- 224A
-5
203A
5-15
Chassis - Top View
-3.
Figure 5
01760-2
:
SMC
AMPLITUDE
ADJUST
SYNC
ADJ
TO A2(2)-—
— TO A205)
Figure 5-9. 5 Mc Oscillator and 9:1 Divider Assy Al-.Component Location
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NOTES
; ) i. PARTIAL REFERENCE DESIGNATIONS ARE SHOWN: PREFTX
WITH ASSEMBLY OR SUBASSEMBLY DESIGNATION(S) OR BOTH
FOR COMPLETE DESIGNATION,
2. COMPONENT VALUES ARE SHOWN AS FOLLOWS UNLESS OTHER
WISE NOTED:
RESISTANCE IN OHMS |
CAPACITANCE IN PICOFARADS
DENOTES ASSEMBLY,
4. DENOTES MAIN SIGNAL PATH.
5. me www DENOTES FEEDBACK PATH,
5. @ DENOTES SCREWDRIVER ADJUST.
T. % AVERAGE VALUE SHOWN, OPTIMUM VALUE SELECTED AT
FACTORY,
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i. PARTIAL REFERENCE DESIGNATIONS ARE SHOWN: PREFIX
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2. COMPONENT VALUES ARE SHOWN AS FOLLOWS UNLESS OTHER-
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Section VI
Paragraphs 6-1 to 6-7
SECTION VI
REPLACEABLE PARTS
6-1 INTRODUCTION. 6-3. Miscellaneous parts are listed at the eud of
Table 6-1.
6-2. This section contains {information for ordering
replacement parts. Table &-1 lists parts in alpha- 6-4. ORDERING INFORMATION.
meric order of their reference designators and indi-
cates the description, -hp- part number of each part,
together with any applicable notes, and provides the
follows:
a. Total quantity used in the instrument (TQ
6-5. To obtain replacement parts, address order or
inquiry fo your local Hewlett-Packard Field Office.
(See Appendix B for list of office locations, ) Identify
parts by their Hewlett-Packard part numbers.
column). 6-6. NON-LISTED PARTS.
[| 6-7. To obtain a part that is not listed, include:
b. Description of the part. (See list of abbrevia- р: ’ её:
tions below. ) a. Instrument model number.
¢. Typical manufacturer of the part in a five- b. Instrument serial number.
digit code. {See Appendix A for list of manu-
facturers.) с. Description of the part.
d. Manufacturer's part number. d. Function and location of the part.
% DESIGNATORS
A = assembly Е = fuse P = plug Y = vaäcuum tube, neun
B = motor FL = filter Q = transistor buib, photovell etc,
BT = battery HR = heater RUE = {ransistor-diode Lu
г ; w = table
С = capacitor J = jack R = resistor = оне
X = socket
CR = diode K = relay RT = thermistor DS а
; . a | = Jampholder
DL = delay line I = inductor 5 = Switch “Fr - fuseholder
DS = lamp M = meter T = transformer
E = misc electronic part MP = mechanical part TC = thermocouple Z = network
ABBREVIATIONS
Ag = silver 1D = inside diameter ns = nanosecond (9) = 1079 SPDT = single-pole double-
Al = aiumintm impe = impregnated ner = not separately replace- throw
amp = ampere {5} incd = incandescent able SPST = Slagle-pole singie-
Au = gold ins = insulation {ed} throw
С = capacitor Ls ant obd = order by description Ta = tantalum
cer = ceramic 5 = kilohm (8) = 10 +3 OD = outside diameter TiO, = titanium dioxide
coef = coefficient Ke = Kiloycycle (5) = 10 0 - peuk tog = toggle
com - common © DC = printed circuit tol = tolerance
comp = composition L = inductor .12 rim 2 trimmer
conn = connection Hn = linear taper pf = picofarad (s) - 10 5 .
2 ) ; ; TSTR = transistor
cps = cycles per second log = logarithmic taper pir = peak inverge voltage
. 5/0 = part of Y = volt {3}
ST _ oe doubl m = milli = 107 pos = position {a} YECW = alternating current
7 COUDE" poté doubler ; -3 poly = polystyrene working voit (s)
throw ma > milliampere (s) = 10 É = potentiometer var = variahle
DPST = double-pole single- +6 Po | ВотСпсний - |
throw TE Me = mepacycle {s} = 10 р-р = peak-to-peak vdew = direct current working
_ hm {s) = 198 prec = precision (temperature voit {8}
elect = electrolytic mo. я _ on a ЗЕЯ coefficient, long term
encap = encapsulated mel im = metal Lim stability, and/or tol- w = watt fs)
mir = manufacturer , — wi
f = fanad (s} t = erance) w/ = with
i , | mE « mounting wiv = reverse working voltage
FET = field effect transistor Cs _ 107 w/o > without
fxd = fixed я 7 micro © R = resistor _
_ .. UV N - ww = wirewound
_ ; my = Mylar RA = rhodium
GaAs = gallium arsenide 9 ; : root-méa,-square
Ge = gigacyele (8) = 1079 na = nançampere (=) = 10 bu N lary пал Воча? * = Oplimum value selected
a - rd fed) - NC = normally closed ro oF y at factory, average
Ce _ cermaniu Ne = neon value shown {part may
grd _ 5 ound (ed) NO 7 normally open Se = gelenium ne omitted)
si NPO = negative positive zera sect = section {8} “ = no standard type numa
. h = henry {ies) (zero temperature cor Si = silicon per assigned {selected
He = mercury efficient) в} = slide or special type)
® Dupont de Nemours
List of Reference Designators and Abbreviations
01760-3
6-1
Section VI Model 203A
Table 6-1
Table 6-1, Reference Designation Index
REFERENCE €
DÉSIGNATION @ STOCK NO. DESCRIPTION NOTE
Ai 00203-66503 Board ass'y, 5 mcps, includes:
Ci thru C13 R11 thru RQ
Li, L2 Ti, T2
QI thru Q4 Yi
A1C1 0140-0207 C: fxd, dipped mica, 330 pf +5%
A1C2 9150-0096 C: fxd, cer, 0.05 uid +80% -20%, 100 vdew
A1C3 0140-1204 C: fxd, dipped mica, 47 pf +5%
A1C4 0140-0208 C: fxd, dipped mica, 680 pf +57
A1CH 0150-00986 С: fxd, cer, 0.05 ufd +80% ~20%, 100 vdew
A1C6 0140-0201 С: fxd, dipped mica, 12 pf +5%
A1C7 — 0140-0176 C: fxd, dipped mica, 100 pf +2%
AlC8 0140-0217 C: fxd, dipped mica, 140 pf +2%
A1C9 0140-0151 C: fxd, dipped mica, 820 pf +2%
A1C10 0150-0096 С: fxd, cer, 0,05 ufd +80% -20%, 100 vdew
A1C11 0140-0157 C: fxd, dipped mica, 1857 pf +1%
А1С12 0140-0178 C: fxd, dipped mica, 560 рЁ +2%
A1C13 0160-0147 C: fxd, dipped mica, 2500 pf +2%
AILI 9140-0029 Coil, В. F., choke, universal wound, unshielded,
100 ph, 2.6 ohms
A1L2 00203-86009 Coil, var
A1QL thru 1854-0005 Transistor, ELA type ZNT08, NPN silicon planar
A1Q4
AIR], AIR2 0687-1521 В: fxd, comp, 1500 ohms +10%, 1/2 W
AIR3 0687-2221 В: fxd, comp, 2200 ohms +10%, 1/2 W
A1R4 0687-5621 В: fxd, comp, 5600 ohms +10%, 1/2 W
AIRS 0687-1231 R: fxd, comp, 12 K ohms +10%, 1/2 W
AIRG 0687-1031 В: fxd, comp, 10 K ohms +107, 1/2 W
AIR7 0687-1521 R: fxd, comp, 1500 ohms +10%, 1/2 W
A1RS 0687-4721 R: fxd, comp, 4700 ohms +10%, 1/2 W
AIRY 0687-1031 В: fxd, comp, 10 K ohms +10%, 1/2 W
AITI 00203-84204 Transformer, tuned
ALTO 00203-84203 Transformer, tuned
AlY! 0410-0009 Crystal unit, quartz, 5 mc, 2 pins on bottom
A2 00203-66506 Board ass'y, R. F, Amplifier, includes:
C1 thru C31 Ql thru Q9
CR1 thru CR4 R1 thru R15
1.1 thru LY T1, T2
A2C1 0131-0003 C: var, mica, single sect, 170 - 780 pf, 175 vdew
A202* 0160-0217 C: fxd, dipped mica, 2300 pf +1%
A2C3 0160-0174 С: fxd, cer, 0.47 uf +80% -20%, 25 vdcw
A2C4 0150-0096 С: fxd, cer, 0,05 ufd +80% -20%, 100 vdew
A2C5 0160-0174 С; fxd, cer, 0.47 uf +80% -20%, 25 vdew
A2C6 0150-6012 C: fxd, cer, 0,01 uf +20%, 1000 vdew
A2C7* 0160-0376 C: fxd, dipped mica, 68 pf +5%
A2C8 0160-0174 С: Ба, сек, 0.47 uf-80% -20%, 25 vdew
A2C9 0150-0096 С: fxd, cer, 0,05 u1d +80% -20%, 100 vdew
A2C10 0150-0012 С: fxd, cer, 0,01 uf +20%, 1000 vdew
A20C11* 0150-0145 C: fxd, cer, 22 pf +10%, 500 vdew
A2C12 0150-0069 C: fxd, cer, 0.901 uf +100% -20%, 500 vacw
A2C13 0140-0154 С: fxd, dipped mica, 1300 pf +5% -
“1 A2C14 0160-3132 С: fxd, cer, 200 pf £10%, B00 vdew
A2C15 0156-0996 C: fxd, cer, 0.05 ufd +80% -20%, 100 vdew
* Average value shown, optimum value selected at factory
6-2
See introduction to this section
01760-4
С
Model 203A Section VI
Table 6-1
Table 6-1. Reference Designation Index (Cont'd)
REFERENCE |
ha Cr
DESIGNATION | ? STOCK No, DESCRIPTION NOTE
A2C16 0160-0127 С: fxd, cer, 1.0 uf +20%, 25 vdew
A2C17, A2C18 0140-0152 C: fxd, mica, 1000 pf 5%, 300 vdew
A2C19 0140-0161 C: fxd, dipped mica, 3932 pf +1%
A2C20 0150-0096 C: fxd, cer, 0.05 ufd +80% -20%, 100 vdew
A2C21 0140-0178 С: fxd, dipped mica, 560 pf +2%
А2С22 0160-0174 C: fxd, cer, 0.47 uf +80% -20%, 25 vdew
A2C23 0150-0012 С: fxd, cer, 0.01 uf +20%, 1000 vdew
A2C24 0140-0154 C: fxd, dipped mica, 1300 pf +5%
A2C25 0160-3132 C: fxd, cer, 200 pf +10%, 500 vdew
A2C26 0150-0095 C: fxd, cer, 0.05 ufd +80% -20%, 100 vdcw
A2C27 0160-0127 C: fxd, cer, 1,0 uf +20%, 25 vdew
A2C28, A2C29 0140-0152 C: fxd, mica, 1000 pf +5%, 300 vdew
A2C30 0140-0161 C: fxd, dipped mica, 3932 pf +1%
A2C31 0180-0059 C: fxd, elect, 10 pf -10% +100%, 25 vdew
AZCR1 thru 1901-0040 Diode, silicon, 30 MA at +1 v, 30 PIV, 2 pf, 2 ns
A2CRA
A2L1 9140-0037 Coil, radio frea. 5 mh induct, universal! wound
A2L2 Not assigned
A2L3 00203-86003 Coil, var
AZ2L4, A215 9140-0037 Coil, radio freq. 5 mh induct, universal wound
A2L6 Not assigned
A2L7 00203-86010 Coil, var
A2Q1 thru 1853-0016 Transistor, 2N3638 PNP silicon
A2Q4
A2Q5 1854-0033 Transistor, ETA type 2N3391, NPN silicon
A206 thru 1853-0018 Transistor, 2N3638 PNP silicon
A2Q8
A2Q9 1854-0033 Transistor, EIA type 2N3391, NPN silicon
A2R1 0687-1021 R: íxd, comp, 1000 chms +10%, 1/2 W
A2R2 0687-6811 R: fxd, comp, 680 ohms +10%, 1/2 W
A2R3 0757-0736 НВ: fxd, met fim, 1.5 K ohms +1%, 1/4 W
A2R4 0757-0715 R: fxd, met film, 150 ohms +1%, 1/4 W
A2R5 0687-4721 В: fxd, comp, 4700 ohms +10%, 1/2 W
A2R6 0757-1032 R: fxd, met fim, 100 ohms +0. 5%, 1/4 W
A2R7 0687-6311 R: fxd, comp, 680 ohms +10%, 1/2 W
A2R8 0757-0736 — R: fxd, met film, 1.5 K ohms +1%, 1/4 W
A2RS 0757-0715 В: fxd, met fim, 150 ohms +1%, 1/4 W
A2R10 0687-4721. R: fxd, comp, 4700 ohms +10%, 1/2 W
A2R11 0687-4731 В: fxd, comp, 47 K ohms +10%, 1/2 W
A2R12 0687-3921 ~ R: fxd, comp, 3900 ohms £10%, 1/2 W
A2R13 0687-4701 R: fxd, comp, 47 ohms +10%, 1/2 W
A2R14 0687-1031 R: fxd, comp, 10 K ohms +10%, 1/2 W
A2R15 0687-4731 R: fxd, comp, 47 K ohms +10%, 1/2 W
A2R16, A2R17 0687-5601 R: fxd, comp, 56 ohms
ATI 00203-84205 Transformer, tuned
A2T2 00203-84208 Transformer, tuned
# See introduction to this section
01760-4 6-3
Section V1 Model 203A
Table 6-1
Table 6-1. Reference Designation Index (Cont'd)
REFERENCE
DESIGNATION ® STOCK NO. DESCRIPTION NOTE
АЗ 00203-66507 Board, ass'y, modulator, includes:
C1 thru C20 RI thru R39
Li thru L6 T1 thru T4
Q1 thru Q13
A3C1 0160-0174 C: fxd, cer, 0.47 uf +80% -20%, 25 vdew
A3C2 0150-0047 C: fxd, TiOg, 6.8 pf +10%, 500 vdew
A3C3 0160-0174 C: fxd, cer, 0.47 uf +80% -20%, 25 vdew
A3C4, A3C5 0150-0093 €: fxd, cer, 0,01 uf +30% -20%, 100 vdew
A3C6 0160-0174 C: fxd, cer, 0.47 uf +80% -20%, 25 vdew
A3CT 0140-0153 C: fxd, mica, 1269 pf +1%, 300 vdew
A3C8 0150-0096 C: fxd, cer, 0,05 ufd +80% -20%, 100 vdew
A3C9 0160-0174 C: fxd, cer, 0.47 uf +80% -20%, 25 vdew
A3C10, A3C11 0150-0096 C: fxd, cer, 0.05 ufd +80% -20%, 100 vdew
A3C12 0150-0071 C: fxd, cer, 400 pf +5%, 500 vdcw
A3C13 0180-0059 C: fxd, elect, 10 uf -10% +100%, 25 vdew
A3C14, A3CI5 0140-0195 C: fxd, dipped mica, 150 pf +5%
A3C16, A3C17 0150-0096 C: fxd, cer, 0.05 ufd +80% -20%, 100 vdew
A3C18 0150-0071 C: fxd, cer, 400 pf +5%, 500 vdew
A3C19, A3C20 0140-0195 C: ixd, dipped mica, 130 pf +5%
A3LI thru 9140-0137 Coil, fixed R. F., 1000 uh +5%, de current rating
A3L3 135 ma
ATA 9140-0029 Coil, R. F. choke, universal wound, unshielded,
100 ph, 2.6 ohms
A3L5 9140-0031 Coil, R. F., 75 uh
A3L6 9140-0137 Coil, fxd, R. F. 1000 uh +5%, de current rating
135 ma
A3Q1 1854-0033 Transistor, EIA type 2N3391, NPN silicon
A3Q2, A393 1854-0005 Transistor, EIA type 2N708, NPN silicon planar
A3Q4 1854-0039 Transistor, EIA type 2N3053, NPN silicon
A3QS thru 1854-0033 Transistor, ETA type 2N3391, NPN silicon
A3Q8
A3Q9 1854-0039 Transistor, EIA type 2N3053, NPN silicon
A3Q10 thru 1854-0033 Transistor, EIA type 2N3391, NPN silicon
A3Q13
A3R1 0687-1031 В: fxd, comp, 10K chms +10%, 1/2 W
A3R2 0687-1521 R: fxd, comp, 1500 ohms +10%, 1/2 W
A3R3 0687-4711 R: fxd, comp, 470 ohms +10%, 1/2 W
A3R4 0687-2221 “R: fxd, comp, 2200 ohms +10%, 1/2 W
A3R5* 0683-4715 В: fxd, comp, 470 ohms, +5%, 1/4 W
A3R6 0687-4721 R: fxd, comp, 4700 ohms +10%, 1/2 W
A3R7 0687-4711 R: fxd, comp, 470 ohms +10%, 1/2 W
ASRS 0687-2221 R: fxd, comp, 2200 ohms +10%, 1/2 W
A3R9, A3RIO 0687-4711 R: fxd, comp, 470 ohms +10%, 1/2 W
A3R11 0687-1521 В: fxd, comp, 1500 ohms +10%, 1/2 W
A3R12 0757-0743 R: fxd, met film, 3.32 K ohms +1%, 1/4 W
A3R13 2100-0282 R: var, lin, ww, 2000 ohms +20%, 1-1/2 'W
A3R14 0757-0743 В: fxd, met flm, 1.21K ohms +1%, 1/4 W
A3R15 0757-0745 В: fxd, met flm, 4. 32K ohms +1%, 1/4 W
A3R16 0757-0339 В: fxd, met fim, 3.01K ohms +1%, 1/4 W
*Average value shown, optimum value selected at factory
6-4
# See introduction to this section
01760-3
Model 203A Section VI
Table 6-1
Table 6-1. Reference Designation Index (Cont'd)
REFERENCE т
DESIGNATION ® STOCK NO. DESCRIPTION NOTE
A3R17 2100-0909 R: var, comp, lin, 100 ohms +30%, 1/4 W
A3R18 0757-0339 R: fxd, met fim, 3.01K ohms +1%, 1/4 W
A3R19 0757-0761 R: fxd, met film, 22. 1K ohms +1%, 1/4 W
A3R20 2100-0908 R: var, comp, lin, 2K +30%, 1/4 W
A3R21 0757-0761 R: fxd, met fim, 22. 1K ohms +1%, 1/4 W
A3R22 0757-1040 R: fxd, met film, 50 ohms +1%, 1/4 W
A3R23 0757-0339 R: fxd, met fim, 3.01K ohms +1%, 1/4 W
A3R24 0757-1040 R: fxd, met film, 50 ohms +1%, 1/4 W
A3R25 0757-0339 В: fxd, met film, 3.01K ohms +1%, 1/4 W
A3R26, A3R27 0687-4711 R: fxd, comp, 470 ohms +10%, 1/2 W
A3R28 0687-1521 R: fxd, comp, 1500 ohms +10%, 1/2 W
A3R29 0757-0745 R: fxd, met film, 4. 32K ohms +1%, 1/4 W
A3R30 0757-0339 R: fxd, met fim, 3. 01K ohms +1%, 1/4 W
A3R31 2100-0909 R: var, comp, lin, 100 ohms +30%, 1/4 W
A3R32 0757-0339 В; fxd, met film, 3.01K ohms +1%, 1/4 W
A3R33 0757-0761 В: fxd, met fim, 22. 1K ohms +1%, 1/4 W
A3R34 2100-0908 В: var, comp, lin, 2K 30%, 1/4 W
A3R35 0757-0761 В: fxd, met flm, 22. 1K ohms +1%, 1/4 W
A3R36 0757-1040 В: fxd, met т, 50 ohms +1%, 1/4 W
A3R37 0757-0339 R: fxd, met fim, 3.01K ohms +1%, 1/4 W
A3R38 0757-1040 R: fxd, met film, 50 ohms +1%, 1/4 W
A3R39 0757-0339 R: fxd, met flm, 3.01K ohms 1%, 1/4 W
; | Cap De Sut bed EN Made
A3T1, A3T2 00203-86005 Transformer, driver ¿ > EY + ой ;
ABTS, ASTA 00203-86004 Transformer, driver o
A4 00203-66511 Board ass'y, filter, includes:
C1 thru C3 ВТ, В?
1.1 thru L3
A4C1, A4C2 0140-0225 C: fxd, dipped mica, 300 pf +1%, 300 vdew
A4C3 0140-0195 C: fxd, dipped mica, 130 pf +5%, 300 vdew
AST.1 Вто 00203-86006 Coil, fxd, 4.5 mh
A4L3
A4Ri 0757-0744 R: fxd, met fim, 3.92K ohms +1%, 1/4 W
A4R2 2100-0282 R: var, lin, ww, 2000 ohms £20%, 1-1/2 W
AD 00203-66511 All components same as A4
Аб 00203-66504 Board ass'y, dc amplifier, includes:
Cl thru C9 R1 thru R22
Q1 thru Q5
А6С1 0150-0012 C: fxd, cer, 0.01 uf +20%, 1000 vdew
ABC2 0150-0096 C: fxd, cer, 0.05 ufd +80% -20%, 100 vdcw
A6C3 0150-0015 С: fxd, TiOg, 2.2 pf +10%, 500 vdew
A6C4 0140-0206 C: fxd, dipped mica, 270 pf +5%
A8C5 0150-0012 C: fxd, cer, 0.01 uf +20%, 1000 vdew
A6C6 Not assigned |
А6С7 0140-0151 C: fxd, dipped mica, 820 pf +2%, 300 vdew
A&C8 0150-0012 C: fxd, cer, 0.01 uf +20%, 1000 vdew
A6C9 0150-0047 С: fxd, TiOg, 6.8 pf +10%, 500 vdew
# See introduction to this section
01760-3 6-5
Section VI Model 203A
Table 6-1
Table 6-1. Reference Designation Index (Cont'd)
REFERENCE |
DESIGNATION & STOCK NO. DESCRIPTION NOTE
АбОТА, В 1854-0014 Transistor, silicon, dual NPN silicon, special
A6Q2 1854-0033 Transistor, EIA type 2N3391, NPN silicon
A6Q3, A6Q4 1853-0008 Transistor, EIA type 2N3250, PNP silicon
A695 1854-0038 Transistor, EIA type, 2N3053, NPN silicon
1205-0033 Heat sink, semiconductor (A6Q5)
A6R1 0757-0762 В: fxd, met fim, 24, 3K ohms +1%, 1/4 W
ABR2 0757-0768 В: fxd, met fim, 47. 5K ohms 1%, 1/4 W
A6R3 0757-0755 R: fxd, met film, 12.1K ohms +1%, 1/4 W
A6R4 0757-0772 В: fxd, met flm, 68.1K ohms +1%, 1/4 W
ABR5 0757-0771 В: fxd, met flm, 61. 9K ohms +1%, 1/4 W
AGR6 0757-0777 В: fxd, met fim, 121K ohms +1%, 1/4 W
ABRT 0687-1061 R: fxd, comp, 10M ohms +10%, 1/2 W
ASRS 2100-0094 В: var, lin, comp, 50K ohms, 30%, 1/5 W
AGR9 0687-4731 R: fxd, comp, 46K ohms +10%, 1/2 W
ASRIO 0687-2721 R: fxd, comp, 2700 ohms +10%, 1/2 W
A6R11 0687-8221 R: fxd, comp, 8200 ohms +10%, 1/2 W
ABR12, A6R13 0687-8211 В: fxd, comp, 820 ohms +10%, 1/2 W
ABR14, AGRI5) 0687-1011 В: fxd, comp, 100 ohms 210%, 1/2 W
ABR16 0687-1021 R: fxd, comp, 1000 ohms +10%, 1/2 W
A6R17 0687-4711 R: fxd, comp, 470 ohms +10%, 1/2 W
A6RI18 0699-0001 R: fxd, comp, 2.7 ohms +10%, 1/2 W
A6R19 0757-0766 В: fxd, met fim, 39.2K ohms +1%, 1/4 W
A6R20 2100-0282 R: var, lin, ww, 2000 ohms +20%, 1-1/2 W
A6R21 0757-0743 В: fxd, met film, 3.32K ohms +1%, 1/4 W
ABR22 0757-0728 В: fxd, met fim, 619 ohms +1%, 1/4 W
A7 00203-66504 All components same as A6
AS 00203-66502 Boara ass'y, square wave, includes:
Cl thru C4 QÍ thru Q5
CRI R1 thru R12
Li, 12
A8C1 0180-0105 C: fxd, Al elect, 50 uf -10% +100%, 25 vdew
A8C2 0180-0050 C: fxd, Al elect, 40 uf -15% +100%, 50 vdew
A8C3* 0140-0039 C: fxd, dipped mica, 47 pf +5%, 500 vacw
A8C4 0180-0105 €: fxd, Al elect, 50 uf -10% +100%, 25 vdew
ASCRI 1901-9025 Diode, silicon, 50 MA at +1 v, 100 PIV, 12 pf
ABL1, A8L2 9140-0029 Coil, В. Е. choke, universal wound, unshielded,
100 ph, 2.6 ohms
A8Qî 1854-0033 Transistor, ELA type 2N3391, NPN silicon
A8Q2, A8Q3 1850-0040 Transistor, PNP germanium
A8Q4, A6Q5 1854-0039 Transistor, EIA type 2N3053, NPN silicon
ABRI, ASR2 0687-1031 R: fxd, comp, 10K ohms 10%, 1/2 W
A8R3 0687-1531 В: fxd, comp, 15K ohms +10%, 1/2 W
ABRA 0757-0744 R: fxd, met flm, 3.92K ohms +1%, 1/4 W
ASR5 0757-0740 R: fxd, met flm, 2.21K ohms +1%, 1/4 W
ASRS 0687-1031 R: fxd, comp, 10K ohms 10%, 1/2 W
A8R7 0757-0741 R: fxd, met flm, 2.43K ohms +1%, 1/4 W
A8R8 0757-1050 R: fxd, met fim, 150 chms +1%, 1/2 W
Average value shown, optimum value selected at factory
6-6
# See introduction to this section
01760-3
Model 203A section VI
Tal e 6-1
Table 6-1. Reference Designation Index {Cont'd)
REFERENCE
he 1 T я
DÉSIGNATION | ® STOCK NO. DESCRIPTION NOTE
A8R9 2100-0206 R: var, lin, ww, 50 ohms +10%, 1 W
A8RI10 0758-0041 В: fxd, met fim, 91 ohms +5%, 1/2 W
A8R11 0757-1027 В: fxd, met film, 680 ohms +1%, 1/4 W
ASR12 0757-0737 R: fxd, met film, 1, 62K ohms +1%, 1/4 W
À9 00203-66502 All components same as AS
Alo 00203-66508 Board ass'y, V. F. O., includes:
Ci thru C12 Qi thru Q3
CR1 R1 thru R10
Li, 12
Aloci 0140-0156 C: fxd, dipped mica, 1500 pf +2%, 300 vdew
A10C2 0140-0182 C: fxd, dipped mica, 5000 pf +2%, 300 vdew
A10C3* Not assigned
А10С4 0150-0096 С: Еха, сег, 0.05 ufd +80% -20%, 100 vdew
А10С5 0140-0220 C: fxd, dipped mica, 200 pf +1%, 300 vdew
A10C6 0150-0096 С: fxd, cer, 0.05 ufd +80% -20%, 100 vdew
A10C7 0140-0178 С: fxd, dipped mica, 560 pf +2%, 300 vdew
A10C8 0150-0071 C: fxd, cer, 400 pf +5%, 500 vdew
А10С9 0150-0096 C: fxd, cer, 0.05 ufd +80% -20%, 109 vdew
A10C10 0140-0153 C: fxd, mica, 1269 pf +1%, 300 vdew
A10C11 0140-0170 C: fxd, dipped mica, 5600 pf +5%, 300 vdew
A10C12 0140-0217 C: fxd, dipped mica, 140 pf +2%, 300 vdew
AlOCRI 1901-0040 Diode, silicon, 30 MA at +1v, 30 PIV, 2 pf, 2 ns
A10L1 9140-0041 Coil, R. F., 2.5 mh +10%
Al0L.2 3140-0029 Coil, НВ. F. choke, universal wound, unshielded,
100 uh, 2.6 ohms
A10Q1 1854-0033 Transistor, EIA type 2N3391, NPN silicon
A10Q2, ATOQ3| 1854-0005 Transistor, ELA type 2N708, NPN silicon planar
A10R1 0758-0017 В: fxd, met film, 1500 ohms +5%, 1/2 W
А10В2 0757-0768 В: fxd, met fim, 47. 5K ohms +1%, 1/4 W
A10R3 0757-0774 В: fxd, met fim, 82. 5K ohms +1%, 1/4 W
AlORA 0757-0738 В: fxd, met flim, 1. 82K ohms +1%, 1/4 W
А108В5 0757-0757 R: fxd, met fim, 15K ohms +1%, 1/4 W
А10В6 0757-0759 R: fxd, met flm, 18.2K ohms +1%, 1/4 W
A10R7 0686-6225 R: fxd, comp, 6200 ohms +5%, 1/2 W
A10R8 0757-0740 В: fxd, met film, 2.21K ohms +1%, 1/4 W
A10R9 0687-1031 R: fxd, comp, 10K ohms +10%, 1/2 W
A10R10 0687-1041 Not assigned.
All 00203-66501 Board ass'y, decade module, includes:
C1 thru C17 Q1 thru Q3
CRI thru CR3 Ri thru R1]1
L1, L2 T1, T2
А11С1, А11С2 | 0150-0096 С; fxd, cer, 0.05 ufd +80% -20%, 100 vdew
A11C3 0140-0145 C: fxd, dipped mica, 22 pf +5%
A11C4,A11C5 0140-0198 C: fxd, dipped mica, 200 pf +5%, 300 vdew
A11C6,A11C7| 0140-0156 C: fxd, dipped mica, 1500 pf +2%, 300 vdew
A11C8 0150-0093 C: fxd, 0.01 uf +80% -20%, 100 vdew
*Average value shown, optimum value selected at factory
61760-5
# See introduction to this section
6-7
Section VI
Al2 thru Al6
A17, A18
A19, A20
A21
A21C1
A21C2*
A21CRI thru
AZ21CR4
A21R1
A22
A22C1
A22C2*
‘00203-66501
00203-66510
6130-0017
0140-0054
1901-0028
0761-0022
00203-66505
0160-0127
All components same as All
Optional
Not assigned
Board ass'y, rectifier, includes:
Ci, C2 R1
CR1 thru CR4
C: var, cer, 8 - 50 pf
C: fxd, cer, 100 pf +5%, 500 vdew
Diode, silicon, rectifier, 400 PIV, 0.75 amp
В: fxd, met oxide flm, 620 ohms +5%, 1 W
Board ass'y, power supply, includes;
C1 thru C15 Ql thru Q6
CRI thru CRS R1 thru R21
Not assigned
С; fxd, cer, 1.0 uf +20%, 25 vdew
Model 203A
Table 6-1
Table 6-1, Reference Designation Index (Cont'd)
REFERENCE
DESIGNATION ús STOCK NO. DESCRIPTION NOTE
А11С9 0140-0224 С; fxd, dipped mica, 280 pf +1%, 300 vdew
A11C10 0140-0151 C: fxd, dipped mica, 820 pf +2%, 300 vdcw
А11С11 0160-0179 C: fxd, dipped mica, 33 pf +5%, 300 vdcw
A11C12 0140-0192 C: fxd, dipped mica, 68 pf +5%, 300 vdew
A11C13 0140-0218 C: fxd, dipped mica, 160 pf +2%, 300 vdew
A11C14 0140-0152 С: fxd, mica, 1000 pf +5%, 300 vdew
A11C15 0140-0154 C: fxd, dipped mica, 1300 pf +5%, 500 vdcw
А11С16 0150-0093 С: fxd, 0.01 uf +80% -20%, 100 vdew
A11C17 0140-0195 C: fxd, dipped mica, 130 pf +5%, 300 vdew
Al1CRI, 1910-0016 Diode, germanium, 100 MA at +0,85 v, 60 v
ATICR2 working
A1ICR3 1901-0040 Diode, silicon, 30 MA at +1 v, 30 PIV, 2 pf, 2 ns
ALLI 00203-86001 Coil, var
Al1L.2 00203-86002 Coil, var
A11Q1 thru 1854-0005 Transistor, EIA type 2N708, NPN silicon planar
A11Q3
А1181 0687-1021 R: fxd, comp, 1000 ohms +10%, 1/2 W
A11R2 thru 0687-4721 R: fxd, comp, 4700 ohms +10%, 1/2 W
A11R4
Al1RS5, Al1RG6! 0757-0761 В: fxd, met flm, 22, 1K ohms +1%, 1/4 W
A11R7 0687-1031 В: fxd, comp, 10K ohms 210%, 1/2 W
A11R8 0687-4721 R: fxd, comp, 4700 ohms +10%, 1/2 W
Al1R9 0687-2221 R: fxd, comp, 2200 ohms +10%, 1/2 W
A11R10 0687-1031 R: fxd, comp, 10K ohms +10%, 1/2 W
Al1R11 0687-1051 В: fxd, comp, 1M ohms +10%, 1/2 W
ATITI 00203-84202 Transformer, tuned
Ai1T2 00203-84201 Transformer, tuned
*Average value shown, optimum value selected at factory
6-8
# See introduction to this section
01760-4
С
Model 203A Section VI
Table 6-1
Table 6-1, Reference Designation Index (Cont'd)
DES CTO @ STOCK NO. DESCRIPTION NOTE
A22C3 0180-0114 С; fxd, Al elect, 4 uf +100% -10%, 25 vdew
A22C4 0180-0039 С: ixd, elect, 100 uf, 12 vdew
A22C5 0180-0050 C: fxd, Al elect, 40 uf -15% +100%, 50 vdew
A22C6 0150-0096 C: fxd, cer, 0.05 ufd, +80% -20%, 100 vdew
A22CT 0180-0224 C: fxd, Al elect, 10 uf -10% +75%, 15 vdew
A22C8 0180-0105 C: fxd, Al elect, 50 uf -10% +100%, 25 vdew
A22C9 0180-0094 C: fxd, Al elect, 100 uf -10% +100%, 25 vdew
A22C10 0150-0096 C: fxd, cer, 0.05 ufd +80% -26%, 100 vdew
A22C11 0160-0127 С; fxd, cer, 1.0 uf +20%, 25 vdew
А22С12* 0150-0096 C: fxd, cer, 0.05 pfd +80% -20%, 100 vdew
A22013 0180-0105 C: fxd, Alelect, 50 ui -10% +100%, 25 vdew
A22C14 0150-0096 C: fxd, cer, 0.05 ufd +80% -20%, 100 vdew
A22C15 0180-0094 C: fxd, Al elect, 100 uf -10% +100%, 25 vdew
A22CR 1902-0761 Diode, breakdown, ElA Буре 1№821, 5.9 £t0 6.5 у
A22CR2, 1901-0025 Diode, silicon, 50 MA at +1 v, 100 PIV, 12 pf
A22CR3
A22CRA4, 1901-0028 Diode, silicon, rectifier, 400 PIV, 0.75 amp
A22CR5
A22Q1 1854-0039 Transister, EIA type 2N3053, NPN silicon
A22Q2 thru 1850-0040 Transistor, PNP germanium
A22Q4
A2205 1854-0039 Transistor, EIA type 2N3053, NPN silicon
A22Q6 1851-0017 Transistor, EIA type 2N1304, NPN germanium
A23R1, A22R2 | 0687-4721 R: fxd, comp, 4700 ohms +10%, 1/2 W
A22R3 0699-0002 R: fxd, comp, 6.8 ohms +10%, 1/2 W
A22R4 0757-0732 R: fxd, met fim, 909 ohms +1%, 1/4 W
A22R5 0757-0736 В: fxd, met flm, 1.5K ohms +1%, 1/4 W
A22R6 0687-2231 R: fxd, comp, 22K ohms +10%, 1/2 W
A22R7 0687-2711 В: fxd, comp, 270 ohms +10%, 1/2 W
A22R8 0687-1821 R: fxd, comp, 1800 ohms +10%, 1/2 W
A22R9 0757-0734 В: fxd, met film, 1. 21K ohms +1%, 1/4 W
A22R10 0687-1011 В; fxd, comp, 100 ohms +10%, 1/2 W
A22R11 0757-0724 В: fxd, met flm, 392 ohms +1%, 1/4 W
A22R12 2100-0281 R: var, lin, ww, 100 ohms 120%, 1-1/2 W
A22R13 0757-1033 В: fxd, met fim, 200 ohms +0. 5%, 1/4 W
A22R14 0757-0730 R: fxd, met film, 750 ohms +1%, 1/4 W
A22R15 0687-3311 R: fxd, comp, 330 ohms 210%, 1/2 W
A22R16 0687-1531 R: fxd, comp, 15K ohms +10%, 1/2 W
A22R17 -687-4721 R: fxd, comp, 4700 ohms +10%, 1/2 W
A22R18 0687-1531 В; fxd, comp, 15K ohms +10%, 1/2 W
A22R19 0687-1011 R: fxd, comp, 100 ohms +10%, 1/2 W
A22R20 2100-0281 В: var, lin, ww, 100 ohms +20%, 1-1/2 W
A22R21 0757-0730 R: fxd, met flm, 750 ohms +1%, 1/4 W
A283, A24 Not assigned
A25 00203-84201 Phase shifter, includes:
C1 thru C3
A25C1 0130-0015 C: var, cer, 9-50 pf —
A25C2, A25C3 | 0160-3132 C: fxd, cer, 200 pf +10%, 500 vdew
CI, C2 0180-0058 С; fxd, elect, 1000 uf, 50 vdew.
C3 0170-0022 C: fxd, mylar, 0.1 uf +20%, 600 vdew
*Average value shown, optimum value selected at factory
01760-5
# See introduction to this section
6-9
Section VI
Model 203A
Table 6-1
Table 6-1. Reference Designation Index (Cont'd)
DESIGNATION @ STOCK NO. DESCRIPTION NOTE
C4 0160-0151 C: fxd, cer, 4700pf -20% +80% 4000vdew
CS 0166-0151 С: fxd, cer, 4700pt -20% +80% 4000vdew
C6 thru C10 Not assigned
C11 0121-0117 C: var, air, 12.5 to 86.9 pf
C12* 0160-0378 С: fxd, dipped mica, 27 pf +5%, 500 vdew
C13 0160-0905 C: fxd, cer, 33 pf +2%, 600 vdew
C14 0140-0225 C: fxd, dipped mica, 300 pf +1%, 300 vdew
C15 0121-0007 C: var, air, 3.6 pf to 26 pf, sinele sect
DSi 2140-0058 Lamp, incandescent, 10 v at 0.040 amps
Fi 2110-0202 Fuse, 300mA for 230V operation
2110-0312 Fuse, 1A for 115V operation
J1 1231-0148 Connector, power, receptacle, 3 pin male recessed
chassis mounting —
J2 thru J5 0340-9086 insulator, BP double, without locating key
0340-0090 Insulator, BP, with locating key
1510-0006 Binding post, black, without solder turret
1510-0007 Binding post, red, without solder turret
Li 9140-0231 Coll, adjustable, inductance, 10.8 to 18.7 uh
L2 9140-0230 Coil, fxd, inductance, 290 uh +1%
L3, Lá 9140-0115 Coil, fxd R. F., 22 uh +10%
MP1 1500-0002 Yoke, coupler, for 1/4 shaft, p/o flexible coupler,
keved and staked
MP2 5040-0212 Insulator, flex coupling
MP3 5060-0021 Gear, ass'y
MP4 5000-0637 Spring, thrust, vernier drive
MP5 5060-0020 Gear, ass'y, with coupling hub
MP6 5020-0233 Collar and stop, dial hub
MPT 5020-0345 Shaft, pin dowel
MP8 5020-0641 Shaft, spur gear
MP9 5020-0639 Bearing, cap drive machine casting
MP10 5020-0630 Hub, dial
MPil 2040-0607 Disc ass'y, vernier drive
Ql, Q2 1850-0038 Transistor, 2N301, PNP, germanium
Q3 1850-0095 Transistor type 2N297A power, PNP germanium
Ri 0761-0054 В: fxd, met fim, 330 ohms +5%, 1 W
R2, R3 0768-0001 R: fxd, met, 1000 ohms +10%, 3 W
R4, R5 0764-0063 В: fxd, met fim, 620 ohms +5%, 2 W
R6 2100-0113 В: var, comp, dual tandem, 2 W
R7, R$ 0757-0728 . R: fxd, met film, 619 ohms +1%, 1/4 W
RY . 2100-0113 R: var, comp, dual tandem, 2 W
R10, R11 0757-0728 В: fxd, met film, 819 ohms 21%, 1/4 W
R12 2100-0113 R: var, comp, dual tandem, 2 W
R13, R14 0757-0728 К: fxd, met flm, 619 ohms +1%, 1/4 W
R15 2160-0113 R: var, comp, dual tandem, 2 W
R16, R17 0757-0728 В: fxd; met flm, 619 ohms +1%, 1/4 W
SIA, B, C 3100-0841 Switch, multiplier
S1C1, S1C2 0160-0170 C: fxd, cer, 0.22 uf +80% -20%, 25 vdew
Sa 3101-1248 Switch, pushbutton
53 3101-1234 Switch, slide
T1 9100-0293 Transformer, power
Wi 8120-1348 Cable ass'y, power
# See introduction to this section
6-10 01760-6
Model 203A Section VI
Table 6-1
Table 6-1, Reference Designation Index (Cont'd)
MISCELLANEOUS
615-40D-4 Plate, freq, dial
120A-47A Spacer, binding post
0340-0090 Insulator, BP, with locating key
0370-0025 Knob, amplitude and frequency vernier
0370-0112 Knob, skirted bar, black, for 1/4" diam shaft
(multiplier)
0370-0160 Knob (frequency dial)
1200-0043 Insulator, transistor, mtg, anodized Alplate (Q1,Q2,Q3)
1200-0081 Insulator, bushing nylon (Q1, Q2, Q3)
1251-0135 Connector, printed circuit, 15 tuning fork type contacts,
terminal type B
1251-2357 Connector, power, receptacle, 3 pin male
1251-1031 Connector, printed circuit, 6 tuning fork type contacts,
terminal 1, style d; 2 thru 6, style b
1251-0475 Connector, printed circuit, 6 tuning fork type contacts,
terminal type B
1400-0084 Body, fusehoider
1410-0052 Bushing, cal adjust potentiometer, 0.435" OD x 0.438" Ig
1460-0114 Spring, gear assembly
1490-0030 Stand, tilt, stainless steel rod 0. 188" diam
1500-0004 Coupler, cal adjust insulator, 1/2' diam x 7/32" lg, nylon
1500-0005 Coupler, cal adjust hub, fits 1/4" diam shaft, nickel plated
1510-0006 Binding Posi, black, without solder turret
1510-0007 Binding Post, red, without solder turret
1520-0001 Plate, mounting, bakelite, oval shape (C1, C2)
9000-0051 Plate, fluted AI
5000-0732 Rear side cover, 5x 11 FM
2000-0733 Front side cover, bx 11 FM
5020-0241 Support, long res bd
5040-0619 Indicator, freq dial
2060-0222 Handle ass'y, side
5060-0625 Ass'y, connector
5060-0731 Frame ass'y, 5 x 11 FM
5060-0739 Top cover ass'y, 11L FM
5060-0751 Bottom cover ass'y, 111 FM
5060-0766 Retainer, 5H handie
5060-0767 Foot ass'y, FM
9211-0248 Carton, corrugated, 20-1/8" 1g x 16-3/4" wd x 10-1/2"
deep x 350 Ib test
9223-0040 Foam, poly, 10-3/4" Ig x 4" wd
09203-00101 Chassis, main
09203-00211 Panel, front
00203-00212 Panel, rear
ADDITIONAL PARTS FOR 203A OPTION:01
A17 00203-00213 Panel, front
00203-66501 Board, decade module
ADDITIONAL PARTS FOR 203A OPTION:02
А17, А18 00203-00214 Panel, front
00203-66501 Board, decade module
# See introduction to this section
01760-4
6-11
Section VI Model 203A
Table 6-2
Table 6-2. Replaceable Parts
5 Stock No. Description Mir. Mir, Part No. TQ
. 61B-40D-4 Plate, freq dial 28480 | 61B-40D-4 1
120A-47A Spacer, binding post 20480 | 120A-47A 1
0121-0007 С: var, air, 3.6 pf to 26 pf, single sect 60486 | CT2-0-25L 1
0121-0117 С: var, air, 12.5 to 86.9 pf 77630 | 882758 1
0130-0015 C: var, cer, 9-50 pf 72982 | 3192-000-U2PO- 1
47R
0130-0017 C: var, cer, 8-50 pf 72982 | 557-019-U2PO-34R| 1
0131-0003 C: var, mica, single sect, 170 - 180 pf, 175 72136 | T52910 1
vdcw
0140-0054 C: fxd, molded mica, 10 pf +10% 04062 | RCM15E101K 1
0140-0145 C: fxd, dipped mica, 22 pf +5% 04062 | RDMISC220J5C 9
0140-0151 C: ixd, dipped mica, 820 pf +2%, 300 vdcw 14655 | obd# 9
0140-0152 C: fxd, mica, 1000 pf +5%, 300 vdew 04062 | DM16F102J 10
0140-0153 C: fxd, mica, 1269 pf +1%, 300 vdew 14655 | CD20F1269F 2
0140-0154 C: fxd, dipped mica, 1300 pf +5%, 500 vdew 14855 | obd# 8
0140-0156 C: fxd, dipped mica, 1500 pf 2%, 300 vdew 00853 | obd# 13
0140-0157 С; fxd, dipped mica, 1857 pi +1%, 500 vdew 14655 | obd# 1
0140-0161 C: fxd, dipped mica, 3932 pf £1%, 300 vdew 14655 | obd# 2
0140-0170 C: fxd, dipped mica, 5600 pf +5%, 300 vdew 00853 | obd# 1
0140-0176 С: fxd, dipped mica, 100 pf +2%, 300 vdew 00853 | obd# 1
0140-0178 С: Ixd, dipped mica, 560 pf +26, 300 vdew 00853 | obd# 3
0140-0182 C: fxd, dipped mica, 5000 pf +2% 0, 300 vdew 00853 ! okbd# 1
0140-0192 С: fxd, dipped mica, 68 pf + 5%, 300 vdew 00853 | obd# 6
0140-0195 C: fxd, dipped mica, 130 pf 15% о, 300 vdew 00853 | obd# 12
0140-0198 С: Ixd, dipped mica, 200 pf +5%, 300 vdew 00853 | obdá 12
0140-0201 С: Ixd, dipped mica, 12 pf +5%, 500 vdew 00853 | obd# 1
0140-0204 С: fxd, dipped mica, 47 pf +5% , 500 vdew 00853 | obd# 1
0140-0206 С: fxd, dipped mica, 270 pf +5%, 500 vdew 00853 | obda? 2
0140-0207 С: ixd, dipped mica, 330 pf +5%, 500 vdew 00853 | obd# 1
0140-0208 С: xd, dipped mica, 680 pf +5% , 300 vdew 00853 | obd# 1
0140-0217 С: Ва, dipped mica, 140 pif +2%Ÿ , 200 vdew 14655 | obd# 2
0140-0218 С: fxd, dipped mica, 1680 pf +2%, 300 vdew 00853 | obd# 6
0140-0220 C: fxd, dipped mica, 200 pf +1%, 300 vdew 00853 | obd# 1
0140-0224 С: fxd, dipped mica, 280 pf +1%, 300 vdew 00853 | obd* 6
0140-0225 C: fxd, dipped mica, 300 pf £1%, 300 vdew 14655 | obd# 5
0150-0012 С: fxd, cer, 9.01 uf 420%, 1000 vdew 71580 | 13 C Disc g
0150-0015 ©; Xd, TiO,. 2.2 pf +10%, 500 хасу 82142 | type JM 9
0150-0047 | C: fxd, TiO,, 6.6 pf £10%, 500 vdcw 82142 | type JM obd# 2
0150-0069 С: fxd, cer, 0.001 uf +100% -20%, 500 vdew 72982 | #801-010x5G01027 1
0150-0071 С: fxd, cer, 400 pf +5%, 500 vdew 56289 | 19C formulation 3
28
0150-0093 С: fxd, 0.01 pf +80% -20%, 100 vdew 91418 | TA obd# 14
0150-0096% | C: fxd, cer, 0.05 pfd +80% -20%, 100 vdew - 94145 | type TA 24
0150-0115 С: fxd, cer, 27 pf £10%, 500 vdew 72982 | 301-000-U2J0- 1
| 270K
0160-0127* | C: fxd, cer, 1.0 u£ +20%, 25 vde w 56289 | 5C13 4
0160-0147 С: fxd, dipped mica, 2500 р! +2%, 300vdew 00853 | obdi 1
0160-0151 C: fxd, cer, 4700pf -207 +80%. 4000vdew 2
0160-0170 | C: fxd, cer, 0.22 uf +80% -20%, 25vdew — | 56289 | 5C9A 2
0160-0174 | C: fxd, cer, 0.47 pf +80% -20%, 25vdew | 56289 | 50114 8
0160-0179 C: fxd, dipped mica, 33pf +5, 300vdew 00853 | obdi 6
* Average value shown, optimum value selected at factory
# See introduction to this section
01760-5
6-12
С
Model 203A Section VI
Table 6-2
Tabie 6-2. Replaceable Parts (Cont'd)
@ Stock No. Description Mir. | Mfr. Part No, TQ
0160-0182 C: ixd, dipped mica, 47 pf +5%, 300 vdew 00833 | obd# 1
0160-0217 C: fxd, dipped mica, 2300 pf +1% 04062 | RDM20F232F3C 1
0160-3132 С: fxd, cer, 200 pf +10%, 500 vdew 71590 | Type CC32, TCN- 4
200
0160-0905 C: fxd, cer, 33 pf +2%, 600 vdew 71590 | CC20 33pf +2% 1
N750
0170-0022 С: fxd, mylar, 0.1 uf +20%, 600 vdew 56289 | 148P175A 1
0180-0039 С: fxd, elect, 100 uf, 12 vdew 56289 | D32697 1
0180-0050 С; fxd, Al elect, 40 uf -15% +100%. 50 vdew 56289 | D32538 3
0180-0056 С: fxd, elect, 1000 uf, 50 vdew 56289 | D32429 2
0180-0059 С: fxd, elect, 10 uf -10% +100%, 25 vdew 526289 | 30D106G025BB4 2
0180-0094 C: fxd, Alelect, 100 uf -10% +100%, 25 vdew 156289 | 30D107GO25DH4 2
0180-0105 C: fxd, Al elect, 50 uf -10% +100%. 25 vdew 56289 | D34114 6
0180-0114 C: fxd, Al elect, 4 uf +100% -10%, 25 vdew 56289 | 30D405/:025 BA4 1
0180-0224 С; fxd, Al elect, 10 pf -10% +75%, 15 vdew 56289 | 30D106G015BA4 1
0340-0086 Insulator, BP Double, without locating key 28480 | 0340-0086 4
0340-0090 Insulator, BP, with locating key 28480 | 0340-0090 5
0370-0025 Knob, amplitude and frequency vernier 28480 | 0370-0025 1
0370-0112 Knob, skirted bar, black, for 1/4" diam shaft | 28480 | 0370-0112 1
(multiplier)
0370-0168 Knob( frequency multiplier) 28480 | 0370-0160 1
0410-0009 Crystal unit, quartz, 5 mc, 2 pins on bottom 0000Ÿ | obdÿ 1
0683-4715 В: fxd, comp, 470 ohms, +5%, 1/4 W 01121 | CB4715 1
0686-6225 R: fxd, comp, 6200 ohms +5%, 1/2 W 01121 | ЕВ-6225 1
3687-1011 R: fxd, comp, 100 ohms +10%, 1/2 W 01121 | #EB1011 6
0687-1021 В: fxd, comp, 1000 ohms +10%, 1/2 W 01121 | #EB1021 9
0687-1031 R: fxd, comp, 10 K ohms +10%, 1/2 W 01121 | #EB1031 23
0687-1051 В: fxd, comp, 1 M ohms 10%, 1/2 W 01121 | #EB1051 8
0687-1061 R: fxd, comp, 10 M ohms +10%, 1/2 W 01121 | #EB1061 2
0687-1231 НВ: fxd, comp, 12 K ohms +10%, 1/2 W 01121 | #EB1231 1
0687-1521 В: fxd, comp, 1500 ohms 110%, 1/2 W 01121 | #EB1521 6
0687-1531 В: fxd, comp, 15 K ohms +10%, 1/2 W 01121 | *EB1531 4
0687-1821 К: fxd, comp, 1800 ohms +10%, 1/2 W 01121 | #EB1821 1
0687-2221 В: fxd, comp, 2200 ohms +10%, 1/2 W 01121 | #ER2221 9
0687-2231 R: fxd, comp, 22 X ohms +10%, 1/2 W 01121 | #EB2231 1
0687-2711 R: fxd, comp, 270 ohms +10%, 1/2 W 01121 | #EB2711 1
0687-2721 R: fxd, comp, 2700 ohms +10%, 1/2 W 01121 | #EB2721 2
0687-3311 В: fxd, comp, 330 ohms 210%, 1/2 W 01121 | #EB3311 1
0687-3921 R: fxd, comp, 3900 ohms +10%, 1/2 W 01121 | XEB3921 1
0687-4701 КВ: fxd, comp, 47 ohms +10%, 1/2 W 01121 | #EB4701 1
0687-4711 В: fxd, comp, 470 ohms +10%, 1/2 W 01121 | #EB4711 8
0687-4721 R: fxd, comp, 4700 ohms +10%, 1/2 W 01121 | #EB4721 31
0687-4731 В: fxd, comp, 47 K ohms +10%, 1/2 W 01121 | #EB4731 4
0687-5621 R: fxd, comp, 5600 ohms +10%, 1/2 W 01121 | #EB5621 1
0687-6811 К: fxd, comp, 680 chms +10%, 1/2 W 01121 | EB6BI11 2
0687-8211 В: fxd, comp, 820 ohms +10%, 1/2 W 01121 | #EB8211 4
0687-8221 R: fxd, comp, 8200 ohms +10%, 1/2 W 01121 | #EB8221 2
0699-0001 R: fxd, comp, 2.7 ohms +10%, 1/2 W 01121 | EB-27G1 9
0699-0002 R: fxd, comp, 6.8 ohms +10%, 1/2 W 01121 | EB 68G1 1
0757-0339 К: fxd, met fim, 3.01 K ohms +1%, 1/4 W 19701 | MF6C T-0O obd# 8
0757-0715 R: fxd, met {lm, 150 ohms +1%, 1/4 W 75042 | СЕВ Т-О obd# 2
# See introduction to this section
1760-4 6-13
Section VI Model 203A
Table 6-2
Table 6-2. Replaceable Parts (Cont'd)
& Stock No. Description Mfr. | Mir, Part No. TQ
0757-0724 R: fxd, met fim, 392 chms +1%, 1/4 W 75042 | CEB T-0O ohd# 1
0757-0728 В: fxd, met fim, 619 ohms +1%, 1/4 W 75042 | CEB T-O obd# 10
0757-0730 В: xd, met flm, 750 ohms +1%, 1/4 W 79042 | СЕВ Т-О obd# 2
0757-0732 К: а, теб т, 909 ohms +1%, 1/4 W 75042 | CEB T-O obdÿ 1
0757-0734 К: fxd, met flm, 1,21 K ohms +19), 1/4 W 75042 | CEB T-0O obd# 1
0757-0736 R: fxd, met fim, 1,5 K ohms +1%, 1/4 W 75042 | CEB T-0O obd# 3
0757-0737 НВ: fxd, met fim, 1.62 K ohms +19, 1/4 W 75042 | CEB T-O obd# 2
0757-0738 НВ: fxd, met fim, 1.82 K ohms +1%, 1/4 W 75042 | CEB T-O obd# 1
0757-0740 R: fxd, met flm, 2.21 K ohms +1%, 1/4 W 75042 | CEB T-O obdÿ 3
0757-0741 R: fxd, met fim, 2,43 K ohms +1%, 1/4 W 75042 | CEB T-0 obd# 2
0757-0743 КЕ: fxd, met fim, 3.32 K ohms +1%, 1/4 W 75042 | CEB T-O obd# 4
0757-0744 R: fxd, met flm, 3.92 K ohms +1%, 1/4 W 75042 | CEB T-0 obd# 4
0757-0745 К: fxd, met fim, 4. 32 K ohms 21%, 1/4 W 75042 | CEB T-O obd# 2
0757-0755 R: fxd, met flm, 12.1 K ohms +1%, 1/4 W 19042 | CEB T-O obd# 2
0757-0757 R: fxd, met flm, 15 K ohms +1%, 1/4 W 75042 | CEB T-O obd# 1
0757-0759 R: fxd, met flm, 18.2 K ohms +1%, 1/4 W 75042 | CEB T-O obd# 1
0757-0761 НВ: fxd, met fim, 22.1 K ohms +1%, 1/4 W 75042 | CEB T-O obd# 16
0757-0762 R: fxd, met fim, 24.3 K ohms +1%, 1/4 W 75042 | CEB T-0 obd# 2
0757-0766 К: fxd, met fim, 39.2 K ohms +1%, 1/4 W 75042 | CEB T-O obd# 2
0757-0768 В: fxd, met fim, 47.5 K ohms +1%, 1/4 W 75042 | CEB T-O obd# 3
0757-0771 R: fxd, met film, 61.9 K ohms +1%, 1/4 W 75042 | CEB T-0O obdf 2
0757-0772 В: fxd, met flm, 68.1 K ohms +1%, 1/4 W 75042 | CEB T-O obd# 2
0757-0774 В: fxd, met fIm, 82.5 K ohms +1%, 1/4 W 75042 1 CEB T-0O obd# 1
0757-0777 R: fxd, met flm, 121 K ohms +1%, 1/4 W 75042 | CEB T-0 obd# 2
0757-1027 R: fxd, met fim, 680 ohms +1%, 1/4 W 75042 | CEB obd# 2
0757-1032 К: fxd, met fim, 100 ohms +0, 5%, 1/4 W 75042 | CEB T-O obd# 1
0757-1033 КЕ: fxd, met flm, 200 ohms +0,5%, 1/4 W 75042 | CEB T-O obdÿ 1
0757-1040 НВ: fxd, met fim, 50 ohms +1%, 1/4 W 75042 | CEB T-O obd# 4
0757-1050 КЕ: fxd, met flm, 150 ohms £1%, 1/2 W 19701 | MF7C T-2 2
0758-0017 В: fxd, met film, 1500 ohms +5%, 1/2 W 07135 | C20 1
0758-0041 В: fxd, met fim, 91 ohms +5%, 1/2 W 07115 | C20 9
0761-0022 В: ixd, met fim, 620 ohms 5% 1W 07115 | C32 1
0761-0054 К: fxd, met ífim, 330 ohms +5%, 1 W 07115 C32 1
0764-0063 НВ: fxd, met fim, 620 ohms +5%, 2 W 28480 | 0764-0063 2
0768-6001 R: fxd, met, 1000 chms +10%, 3 W 76055 | 3MOL 2
1200-0043 Insulator, transistor, mtg, anodized Al plate 28480 | 1200-0043 3
(Q1, Q2, Q3)
1200-0081 Insulator, bushing, nylon (Q1, Q2, Q3) 26365 | 974 Special 6
1205-0033 Heat dissipater, semiconductor (A6Q5) 28480 | 1205-0033
1251-0135 Connector, printed circuit, 15 tuning fork 000XX | SD 615 UR 5
type contacts, terminal type B
1251-2357 Connector, power 1
1251-0475 Connector, printed circuit, 6 tuning fork type | 02660 | 143-006-08(109) 13
contacts, terminal type B
1251-1031 Comnector, printed circuit, 6 tuning fork type | O00XX | SD-608UR-TS1 1
contacts, terminal 1, style d; 2 thru 6, styleb
1400-0084 Body, fuseholder 1
1410-0052 Bushing, potentiometer, 0.435" OD x 0.438" 28480 | 1410-0052 1
lg |
# See introduction to this section
6-14 01760-3
=
Model 203A
« # Stock No.
Section VI
Table 6-2
Table 6-2, Replaceable Parts (Cont'd)
Description Mir. Mir. Part No. TQ
1490-0030 Stand, tilt, stainless steel rod 0. 188'' diam 91260 | obd# 1
1500-0002 Yoke, coupler, for 1/4’ shaft, p/o flexible 76487 | obd# 2
coupler, keyed and staked
1500-0004 Coupler, insulator, 1/2" diam x 7/32" lg, 99934 | obd# 1
nylon
1500-0005 Coupler, hub, fits 1/4" diam shaft, nickel 98934 | obd# 2
plated
1510-0006 Binding Post, black, without solder turret 28480 | 1510-0006 5
1510-0007 Binding Post, red, without solder turret 28480 | 1510-0007 5
1520-0001 Plate, mounting, bakelite, oval shape (C1, 56137 | Grade XP 2
C2)
1850-0038 Transistor, 2N301, PNP sermanium 28480 1850-0039 5
1850-0040 Transistor, PNP germanium 28480 | 1850-0040 Т
1850-0095 Transistor, type 2N297A power, PNP germa- | 16758 | 2N297A 1
nium
1851-0017 Transistor, EIA type 2N1304, NPN germanium‘ 01295 | 2N1304 1
1853-0008 Transistor, EIA type 2N3250, PNP silicon 04713 | 2N3250 4
1853-0009 Transistor, PNP silicon 04713 | SM3197 2
1853-0016 Transistor, 2N3038, PNP silicon 28480 1853-0016 5
1854-0005 Transistor, EIA type 2N708, NPN silicon 86684 | 2NT708 26
planar
1854-0014 Transistor, silicon, dual NPN silicon, 00872 | SA2015 4
special |
1854-0033 Transistor, EIA type 2N3391, NPN silicon 24446 | obd# 16
1854-0039 Transistor, EIA type 2N3053, NPN silicon 86684 | 2N2270 10
1901-0025 Diode, silicon, 50 MA at +1 v, 100 PIV, 12 pf | 03877 | SG-817 4
1901-0026 Diode, silicon, rectifier, 200 PIV, 0.5 amp 14099 | SA783 4
1901-0040 Diode, silicon, 30 MA at +1 v, 30 PIV, 2 pf, 03877 | SG5050 11
2 ns
1901-0049 Diode, silicon, rectifier, 50 PIV, 0.5 amp 86684 | 34934 2
1902-0761 Diode, breakdown, EIA type IN821, 5.9 to 03877 | 1№821 1
6.5 v, 0.01%/ C
1910-0016 Diode, germanium, 100 MA at +0.85 v, 60 v 11711 | GD 150 12
working
2100-0094 R: var, lin, comp, 50 K ohms, 30%, 1/5W 28480 | 2100-0004 9
2100-0113 R: var, comp, 2 W, dual tendem 01121 | JJ59160 4
2100-0206 R: var, lin, ww, 50 ohms 210%, 1 W 11236 | Series 110 9
2100-0281 R: var, lin, ww, 100 ohms +20%, 1-1/2 W 11236 | Series 110 2
2100-0282 К: var, lin, ww, 2000 ohms +20%, 1-1/2 W 11236 | Series 110 5
2100-0908 R: var, comp, lin, 2 K +30%, 1/4 W 76055 | MTC-1 obd# 2
2100-0909 R: var, comp, lin, 100 chms +30%, 1/4 W 70055 | MTC-1 obd# 2
2110-0202 Fuse, 500mA 1
2110-0312 Fuse, 1A 1
2140-0058 Lamp, incandescent, 10v at 0. 040 amps 94154 | 367 1
3100-0841 Switch, Multiplier 76854 | obd# 3
3101-1234 Switch, slide | 1
3101-1248 Switch, pushbutton i
5000-0051 Plate, fiuted Al 28480 | 5000-0051 1
2000-0637 Spring, thrust 28480 | 5000-0637 1
5000-8597 Rear side cover, 5 x 11 FM 28480 | 5000-8597 1
5000-8589 Front side cover, 5x 11 FM 28480 | 5000-8599 1
5020-0233 | Collar 28480 | 5020-0233 1
5020-0241 Support, long res bd 28480 | 5020-0241 1
5020-0345 Pin, dowell 28480 | 5020-0345 1
5020-0630 Hub, dial 28480 | 5020-0630 Î
# See introduction to this section
(1760-5 6-15
Section VI Model 203A
Table 6-2
Table 6-2. Replaceable Parts (Cont'd)
éà Stock No. Description Mfr. | Mir. Part No. TQ
5020-0639 Bearing, cap drive 28480 | 5020-0639 1
5020-0641 Shaft, spur gear 28480 |? 5020-0641 i
5040-0212 Insulator, flex coupling 28480 | 5040-0212 1
5040-0607 Disc ass'y, vernier drive 28480 | 5040-0607 1
5040-0619 Indicator, freq dial 28480 | 5040-0619 1
5060-0020 Gear, ass'y with coupling hub 28480 | 5060-0020 i
5000-0021 Gear, ass'y 28480 | 5060-0021 1
5060-0222 Handle ass'y, side 28489 | 5060-0222 2
5060-0625 Ass'y, connector 28480 | 5060-0625 1
5060-0731 Frame ass'y, 5 x 11 FM 28480 | 5060-0731 2
2060-0739 Top cover ass'y, 11L FM 28480 | 5060-0739 1
5060-0751 Bottom cover ass'y, 11L FM 28480 | 5060-0751 Î
5060-0766 Retainer, 5H handle 28480 | 5060-0766 2
5060-0767 Foot ass'y, FM 28480 | 5060-0767 5
8120-1348 Cable ass'y, power i
9100-0293 Transformer, power 28480 | 5080-3423 1
9140-0029 Coil, R. F., choke, universal wound, un- 28480 | 9140-0029 7
shieided, 100 uh, 2. 6 chms
9140-0031 Coil, R, F,, 75 uh 28480 | 9140-0031 1
9140-0037 Coil, radio freq 5 mh induct, universal 99848 | 35000-15-502 5
wound
9140-0041 Coil, R. F., 2.5 mh +10% 95265 | SA-2500-1 1
9140-0115 Coil, fxd R. F., 22 uh £10% 76493 | 9330-32 2
9140-0137 Coil, fxd R. F., 1000 uk +5%, de current 76493 | 9220-28 4
rating 135 ma
9140-0230 Coil, fxd, inductance, 260 ph +1% 28480 | 9140-0230 1
9140-0231 Coil, adjustable, inductance, 10.8 to 18.7 28480 ¡ 9140-0231 1
uh
9211-0248 Carton, corrugated, 20-1/8'" 1g x 16-3/4" wd | 84324 | obd# 1
x 10-1/2" deep x 350 Ib test
9223-0040 Foam, poly, 10-3/4" le x 4" wd 28480 | 9223-0040 4
00203-00101 | Chassis, main 28480 | 00203-00101 1
00203-00211 Panel, front 28480 | 00203-00211 1
00203-00212 Panel, rear for 115/230v operation only 28480 | 00203-00212 1
00203-00216 | Panel, rear for 100 v operation only 28480 | 00203-00216 1
00203-64201 Phase shifter 28480 | 00203-84201 1
00203-66501 Board ass'y, decade module 28480 | 00203-66501 8
00203-66502 Board ass'y, square wave 28480 | 00203-66502 2
09203-66503 Board ass'y, 5 mcps 28480 | 00203-66503 1
00203-66504 Board ass'y, dc amplifier 28480 | 00203-66504 2
00203-66505 Board ass'y, power supply 28480 | 00203-66505 1
00203-66506 Board ass'y, R. ¥. Amplifier 28480 | 00203-86508 1
00203-66507 Board, ass'y, modulator 28480 | 00203-66507 1
00203-66508 Board ass'y, V. F.O. 28480 | 00203-66508 1
00203-66510 Board ass'y, rectifier 28480 | 00203-66510 1
00203-66511 Board ass'y, filter 20480 | 00203-66511 2
00203-84201 Transformer, tuned 28480 | 00203-84201 6
00203-84202 Transformer, tuned 28480 | 00203-84202 6
00203-84203 Transformer, tuned 28480 | 00203-84203 1
00203-84204 Transformer, tuned 28480 | 00203-84204 1
00203-84205 Transformer, tuned 28480 | 00203-84205 1
00203-84206 Transformer, tuned 28480 | 00203-84206 1
00203-86001 Coil, чат, 2.5 - 6.2 un 28480 | 00203-86001 6
00203-86002 Coil, var , 650 - 1100 ив 28480: | 00203-86002 6
# See introduction to this section
01760-3
=
Model 203A
Table 6-2. Replaceable Parts (Cont'd)
Section VI
Table 6-2
@ Stock No. Description Mir. Mfr. Part No, TQ
00203-86003 Coil, var, 35 - 80 ph 28480 | 00203-88003 1
00203-86004 Transformer, driver 28480 | 00203-88004 2
00203-86005 Transformer, driver 28480 | 00203-86005 2
00203-86006 Coil, fxd, 4.5 mh 28480 | 00203-86008 6
00203-86009 Coil, var, 650 - 1100 uh 28480 | 00203-86009 1
00203-86010 | Cail, var, 35 - 80 uh 28480 | 00203-86010 1
Additional Parts for 203A Option: 01
00203-00213 Panel, front 28480 | 00203-00213 i
00203-86501 Board, decade module 28480 | 00203-66501 1
Additional Parts for 203A Option: 02
00203-00214 Panel, front 28480 | 00203-00214 1
00203-66501 Board, decade module 28480 1 00203-66501 2
01760-3
# See introduction'to this section
6-17
Appendix C
MODEL 203A
VARIABLE PHASE FUNCTION GENERATOR
Manual Serial Prefixed: 1201J-
-hp- Part No. 00203-99902
Model 203A
This manual backdating sheet makes this manual applicable to earlier instru-
Instrument-component values that differ from those in the manual,
yet are not listed in the backdating sheet, should be replaced using the part
number given in the manual.
ments.
Instrument Serial Prefix Make Manual Changes Instrument Serial Prefix Make Manual Changes
425-00770 and below 1, 2, 3, 4 12013-02534 and below 4
1425-00771 to-008865 2, 3, 4
621, 714, 821 2, 3, 4,
1019J and below 3, 4
CHANGE #1
CHANGE #2
Current Part No. for Transistor A2Q3, A2Q4, A2QT and
A2Q8 is 1853-0018, 2N3638 and is a recommended replace-
ment for Part No. 1853-0009, 2N274. If either one of these
transistors is replaced with the current 2N3638, the other
three should also be replaced and inductors L1 and 1.2
replaced with a 56 chm resistor, -hp- Part No. 0887-5601.
This recommended change is to improve phase stability
at high temperatures.
Change: $2 and S3 to HP Part No. 3101-0100 and 3101 - 0033,
respectively (Page 6-10, Table 6-1 and Page 6-15, Table
6-2).
Change: WI to HP Part No. 8120-0078 (Page 6-10, Table 6-1
and Page 6-16, Table 6-2).
\ Miscellaneous Parts Change
Change: HP PartNo. 1251-2357 (connector, power) to 1251 ~
0148 (Page 6-11, Table 6-1 and Page 6-14, Table 6-2).
Change: HP Part No. 1400-0084 (Body, fuseholder) to 1400-
0110 (Page 6-11, Table 6-1 and Page 6-14, Table 6-2),
Add: Nut, retaining for 1400-0110, HP Part No. 1400-0111
{Page 6-11, Table 6-1 and Page 6-14, Table 6-2).
Add: Knob, fuseholder black for 1400-0110, HP Part No.
1400-0210 (Page 6-11, Table 6-1 and Page 6-14, Table
6-2), |
Change: HP Part No. 00203-00211 (Panel, front) to 00203-
00201 (Page 6-11, Table 6-1 and Page 6-16, Table 6-2).
Change: HP Part No. 00203-00212 (Panel, rear) to 00203-
00202 (Page 6-11, Table 6-1 and Page 6-16, Table 6-2).
Change: HP Part No, 00203-00213 (Panel, front) to 00203-
00203 (Page 6-11, Table 6-1 and Page 6-17, Table 6-2),
Change: HP Part No. 00203-00214 (Panel, front) to 00203.
00204 (Page 6-11, Table 6-1 and Page 6-17, Table 6-2),
Delete C4 C5 and thru C10
Add C4 A, B 0150-0119 C: fxd, cer, 2 x 0.1 uf +20%, 250vdew
Add C5 thrn C10 Not assigned
Model 203A
CHANGE #3
CHANGE #4
Change: HP Part No. 5000-8597 (Side Cover) to 5000-0732
(Page 6-15, Table 6-2).
Change: HP Part No, 5000-8599 (Side Cover) to 5000-0733
(Page 6-15, Table 6-2).
Change: HP Part No, 5060-8587 (Top Cover Ass'y) to 5060-
-0739 (Page 6-16, Table 6-2),
Change: HP Part No. 5060-8711 (Bottom Cover Ass'y)to
5060-0751 (Page 6-16, Table 6-2),
Change: HP Part No. 5060-8737 (Retainer) to 5060-0766
(Page 6-16, Table 6-2).
Change: HP Part No, 8120-1378 (Power Cord)to 8120-1348
(Page 6-16, Table 6-2).
Change: HP Part No. 00203-00311 (Front Panel} to 00203-
00211 {Page 6-16, Table 6-2),
Change: HP Part No, 60203-00313 (Front Panel for OPT 001)
to 00203-00213 (Page 6-16, Table 6-2).
Change: HP Part No, 00203-00314 {Front Panel for OPT 002)
to 00203-00214 (Page 6-16, Table 6-2).
Change: HP Part No. 0160-0378 (C12) to 0140-0145 (Page
6-10, Table 6-1 and Page 5-21, Figure 5-14).
Appendix C

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