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Agilent Technologies, Inc www agilent corn
24001 E Mission
Liberty Lake, W A 99019
.':.+:.
. .
Agilent Technologies
.
*
:
e.
. ' Innovating the HPWay
June 8,2000
Dear Customer,
As of November 1, 1999, four of Hewlett-Packard's businesses, test and measurement,
semiconductor products, health care solutions, and chemical analysis became a new company,
Agilent Technologies. Now, many of your Hewlett-Packard products and services are in the care of
Agilent Technologies.
At Agilent Technologies, we are working diligently to make this transition as smooth as possible for
you. However, as a result of this transition, the products and related documentation contained in this
shipment may be labeled with either the Hewlett-Packard name and logo, the Agilent Technologies
name and logo, or a combination of both. Information in this package may refer to Hewlett-Packard
(HP), but applies to your Agilent Technologies product. Hewlett-Packard and Agilent branded
products with the same model number are interchangeable.
Whatever logo you see, the information, products, and services come from the same reliable source.
If you have questions about Agilent Technologies products and services, please visit our website at
http://www.aqilent.com.
Sincerely,
Rebranding Team
HP 8904A
MULTIFUNCTION SYNTHESIZER
(Including Options 001, 002, 003, and 004)
Service Manual
SERIAL NUMBERS
T i manual applies directly t o instruments with
hs
serial numbers prefixed
S E W PREFIXES
2712A to 2948A and all M A J O R changes that apply to your instrument.
rev.OlJUL91
For additional important information about serial
numbers, refer to "INSTRUMENTSCOVERED BY
THIS MANUAL" in Section 1.
Fourth Edition
T i material may be reproduced by or for the U.S.
hs
Government pursuant to the Copyright License un-
der the clause at DFARS 52.227-7013 (APR 1988).
Copyright@ HEWLETT-PACKARD COMPANY 1987
EAST 24001 MISSION AVENUE, TAF C-34, SPOKANE, WASHINGTON, U.S.A. 99220
Service Manual HP Part 08904-90008
Other Documents Availiable:
Operation and Calibration Manual HP Part 08904-90007
Operation and Application Guide HP Part 5953-8491
Microfiche Service Manual HP Part 08904-90020
Microfiche OperationlCalibration Manual HP Part 08904-90019 Printed In U.S.A.: June 1992
HEWLETT
PACKARD
1 Regulatory Information
(Updated March 1999)
1
Regulatory Information (Updated March 1999)
Safety Considerations
GENERAL
This product a n d related documentation must be reviewed for familiarization with safety
m a r k i n g s a n d instructions before operation.
This product has been designed a n d tested in accordance with IEC Publication 1010,
"Safety R e q u i r e m e n t s for Electronic Measuring Apparatus," and has been supplied in a
safe condition. This instruction documentation contains information a n d warnings which
must be followed by t h e u s e r t o ensure safe operation a n d to maintain t h e product i n a safe
condition.
SAFETY EARTH GROUND
A uninterruptible safety e a r t h ground must be provided from the m a i n power source t o t h e
product i n p u t wiring terminals, power cord, or supplied power cord set.
SAFETY SYMBOLS
A Indicates i n s t r u m e n t d a m a g e c a n occur if indicated operating limits a r e exceeded.
r;n Indicates h a z a r d o u s voltages.
1- Indicates e a r t h (ground) t e r m i n a l
-
~~ ~ ~
WARNING A WARNING note denotes a hazard. It calls attention to a procedure,
practice, or the like, which, if not correctly performed or adhered to,
could result in personal injury. Do not proceed beyond a WARNING
sign until the indicated conditions are fully understood and met.
~ ~ ~
CAUTION A CAUTION note denotes a hazard. I t calls attention to a n operation
procedure, practice, or the like, which, if not correctly performed or a d h e r e d
to, could r e s u l t i n damage to or destruction of part or all of t h e product. Do
n o t proceed beyond a n CAUTION note until t h e indicated conditions a r e fully
understood a n d met.
2 Chapter 1
Regulatory Information (Updated March 1999)
Safety Considerations for this Instrument
~
WARNING This product is a Safety Class I instrument (provided with a
protective earthing ground incorporated in the power cord). The
mains plug shall only be inserted in a socket outlet provided with a
protective earth contact. Any interruption of the protective
conductor inside or outside of the product is likely to make the
product dangerous. Intentional interruption is prohibited.
Whenever it is likely that the protection has been impaired, the
instrument must be made inoperative and be secured against any
unintended operation.
If this instrument is to be energized via an auto transformer (for
voltage reduction), make sure the common terminal is connected to
the earth terminal of the power source.
If this product is not used as specified, the protection provided by
the equipment could be impaired. This product must be used in a
normal condition (in which all means for protection are intact) only.
N o operator serviceable parts in this product. Refer servicing to
qualified personnel. To prevent electrical shock, do not remove
covers.
Servicing instructions are for use by qualified personnel only. To
avoid electrical shock, do not perform any servicing unless you are
qualified to do so.
The opening of covers or removal of parts is likely to expose
dangerous voltages. Disconnect the product from all voltage sources
while it is being opened.
The power cord is connected to internal capacitors that my remain
live for 5 seconds after disconnecting the plug from its power supply.
For Continued protection against fire hazard, replace the line fuse(s)
only with 250 V fuse(s) or the same current rating and type (for
example, normal blow or time delay). Do not use repaired fuses or
short circuited fuseholders.
Always use the three-prong ac power cord supplied with this
product. Failure to ensure adequate earth grounding by not using
this cord may cause product damage.
This product is designed for use in Installation Category I1 and
Pollution Degree 2 per IEC 1010 and IEC 664 respectively. FOR
INDOOR USE ONLY.
This product has autoranging line voltage input, be sure the supply
voltage is within the specified range.
Chapter 1 3
Regulatory Information (Updated March 1999)
To prevent electrical shock, disconnect instrument from mains (line)
before cleaning. Use a dry cloth or one slightly dampened with water
to clean the external case parts. Do not attempt to clean internally.
Ventilation Requirements: When installing the product in a cabinet,
the convection into and out of the product must not be restricted.
The ambient temperature (outside the cabinet) must be less than the
maximum operating temperature of the product by 4" C for every 100
watts dissipated in the cabinet. If the total power dissipated in the
cabinet is greater than 800 watts, then forced convection must be
used.
Product Markings
CE - the CE m a r k is a registered t r a d e m a r k of the E u r o p e a n Community. A C E m a r k
accompanied by a year indicated t h e y e a r t h e design was proven.
CSA - t h e CSA m a r k is a registered t r a d e m a r k of t h e C a n a d i a n S t a n d a r d s Association.
Chapter 1
Model 8904A Contents
CONTENTS
Section 6 .Replaceable Parts
Introduction to This Section . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 61.
Reference Designations and Abbreviations Used in This Manual . . . . . . . . . . . . . . . . . . . . . . . . 6.1
Replaceable Parts List . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6.1
Ordering Parts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 61
.
Replaceable Parts List Updating (Manual Updates) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 62
.
Mechanical and Chassis Part Locations and Reference Designations . . . . . . . . . . . . . . . . . . . . . . 6.2
Section 7 .Instrument Changes
Introduction to This Section . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 71
.
Option Conversions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 71
.
Instrument Modifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7.1
Firmware Updates (A2U12 and A2U13) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 78
.
Hardware Modifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 78
.
Modification for Possible Ground Wire Shock Hazard . . . . . . . . . . . . . . . . . . . . . . . . . . . . 79
.
Modification for Output Overvoltage Protection Improvement . . . . . . . . . . . . . . . . . . . . . . . 7-13
Modification for Potential Power Supply Short . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-14
Section 8 .Service
Introduction to This Section . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8.1
How the Section is Organized . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8.1
Safety Considerations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 81
.
Before Applying Power . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 81
.
Safety . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-1
Service Tools, Helps, and Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-3
Printed Circuit Board Extractor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8.3
Assembly, Parts. and Cable Locations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8.3
Other Service Documents . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8.3
Recommended Test Equipment and Accessories . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8.3
Schematic Symbology and Schematic Diagram Notes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8.3
Principles of Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-15
Overall . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-15
A2 Digital Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-23
A3 Output Assembly (Service Sheets 1 through 4) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-24
Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-29
General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-29
A2 Digital Assembly to A3 (or A10) Output Assembly Interface . . . . . . . . . . . . . . . . . . . . . . 8-30
A2 Digital Assembly to A1 Keyboard Assembly Interface . . . . . . . . . . . . . . . . . . . . . . . . . 8-38
A2 Digital Assembly to A5 Display Assembly Interface . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-41
A3 or A10 Output Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-42
reu.200CT88
Contents Model 8904A
Section 8 .Service (cont'd)
How to Restore the Serial Number in a Replacement A2 Dgtl Assembly . . . . . . . . . . . . . . . . 8-43
iia
How to Restore Options 001 and 003 i a Replacement A2 Dgtl Assembly . . . . . . . . . . . . . . 8-46
n iia
How to Replace the Memory Backup Battery . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-48.1
Service Sheets 1 through 4 (schematics) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-50
reu.200CT88
Model 8904A Replaceable Parts
Section 6
REPLACEABLE PARTS
6-1. INTRODUCTION TO THIS SECTION
This section contains information for ordering parts. Table 6- 1 lists reference designations, and
Table 6-2 lists abbreviations that are used in the Replaceable Parts List. Table 6-3 lists all replaceable
parts in the instrument. Table 6-4 contains the names and addresses that correspond to the
manufacturer's code numbers listed in Table 6-3. Also included in this section are drawings to aid
in identifying and ordering chassis mounted parts and mechanical parts.
6-2. REFERENCE DESIGNATIONS AND ABBREVIATIONS USED IN THIS MANUAL
Table 6-1 lists the reference designation letters for electrical parts in the instrument. The letter
designations found in Table 6-1 are coupled with numeric designations to provide a unique reference
designation for each part in the instrument. For example A3R1 is the reference designation of a
particular resistor R1 on assembly A3. Designators with no letter are mechanical parts.
Table 6-2 lists abbreviations used in the parts list and on schematics.
6-3. REPLACEABLE PARTS LIST
Table 6-3 is a list of replaceable parts and is organized as follows:
a. Electrical assemblies and their components with reference designations in alphanumeric order.
b. Chassis-mounted parts with reference designations in alphanumeric order.
c. Mechanical parts with reference designations in numeric order.
Ordering Parts.
Instrument Serial Numbers.
Attached to the rear of the instrument is a serial-number plate. The first four digits and the letter
are the instrument serial-number prefix. The last five digits (serial-number suffix) are unique to each
instrument. When parts in the instrument are changed, the serial-number prefix of the instrument may
also change. This means that sometimes a part will be listed more than once in the the replaceable
parts list along with a serial-number prefix or range of serial-number prefixes. Find the serial-number
prefix on the serial plate of your instrument and order the part listed under the corresponding prefix
in the table. If no serial prefix information is listed, the part is compatible in instruments of all serial
numbers.
NOTE
I t is possible that some assemblies in your instrument have been updated
(through service or retrofitting) to reflect changes made to instruments with
serial-number prefixes later than that shown o n your instrument serial-
number tag. Be sure to note the printed circuit board number of the assembly
being repaired or replaced when ordering parts for your instrument.
6- 1
Replaceable Parts Model 8904A
How to Order
To order a part in the Replaceable P r s List, call or write the nearest Hewlett-Packard Sales Office.
at
Have the following information ready to speed the ordering process:
1 T h e Hewlett-Packard part number with the check digit. (The check digit will ensure accurate and
.
timely processing of your order.)
2 T h e quantity required.
.
3 An approved purchase order number. (Sometimes required.)
.
NOTE
Within the USA, it is better to order directly from the HP Support
Mater& Organization, RoseviUe, California. Ask your nearest HP office
for information and f o r m for the uDirect Order Systems.
Replaceable Parts List Updating (Manual Updates)
A "MANUAL UPDATES` packet is shipped with the manual, when necessary, to provide the most
current information available at the time of shipment. These packets consist of replacement and
addition pages which should be incorporated into the manual to bring it up to date.
Hewlett-Packard offers a Documentation Update Service that will provide you with further updates
as they become available. If you operate or service instruments of different serial prefixes, we strongly
recommend that you join this service immediately to ensure that you manual is kept current. For more
information, refer to the Documentation Update Service reply card included in this manual, or calk
Technical Writing Department (509)922-4001,
or write:
Hewlett-Packard Company
Technical Writing Department
24001 E. Mission - TAF C-34
Spokane, W 99220
A
6-4. MECHANICAL AND CHASSIS PART LOCATIONS AND REFERENCE DESIGNATIONS
Most mechanical parts are identified in Figures 6-1 to 6-6. These figures are located at the end of
this section. To find the part number and description of a mechanical part, find the part in one of the
drawings, and then look up the item number in Table 6-3 (mechanical part numbers are listed under
Miscellaneous Parts toward the end of Table 6-3).
6-2 rev.15FEB88
Model 8904A Replaceable Parts
nable 6-1. Reference Designations
REFERENCE DESIGNATIONS
A . . . . . . . . assembly E . . . . . . . . . . . .miscellaneous P . . . . . . . electrical connector U . . . . . . . . . integrated circuit;
AT . . . . . . attenuator; isolator; electrical part (movable portion); microcircuit
termination F .................... fuse Plug V . . . . . . . . . . . . . electron tube
B . . . . . . . . . . . . . . . fan: motor FL . . . . . . . . . . . . . . . . . . . filter Q . . . . . . . . . . transistor; SCR; VR . . . . . . . . voltage regulator;
BT . . . . . . . . . . . . . . . . . battery H . . . . . . . . . . . . . . . . hardware triode thyristor; FET breakdown diode
c . . . . . . . . . . . . . . . . capacitor HY . . . . . . . . . . . . . . . circulator R . . . . . . . . . . . . . . . . . resistor W . . . . . . . cable: transmission
CP . . . . . . . . . . . . . . . . coupler J . . . . . . . . electrical connector RT . . . . . . . . . . . . . . thermistor path; wire
CR . . . . . . . . . . . . diode; diode (stationary portion); S . . . . . . . . . . . . . . . . . . switch X . . . . . . . . . . . . . . . . . . socket
thyristor: varactor jack T . . . . . . . . . . . . . . transformer Y . . . . . . . . crystal unit (piezo-
DC . . . . . . . directional coupler K . . . . . . . . . . . . . . . . . . . relay TB . . . . . . . . . . terminal board electric or quartz)
DL . ,. . . . . . . . . . . . . . delay line L . . . . . . . . . . . . . coil; inductor TC . . . . . . . . . . . thermocouple 2 . . . . . . . . tuned cavity; tuned
.
DS ........... annunciator: M . . . . . . . . . . . . . . . . . . meter TP . . . . . . . . . . . . . . . test point circuit
signaling device MP . . . . . . . . . . miscellaneous
(audible or visual); mechanical part
lamp; LED
Table 6-2. Abbreviations (1 of 2)
ABBREVIATIONS
COEF . . . . . . . . . . . coefficient EDP . . . . . . . . . electronic data INT . . . . . . . . . . . . . . . .internal
ac . . . . . . . . alternating current COM . . . . . . . . . . . . . common processing kg . . . . . . . . . . . . . . . . kilogram
ACCESS . . . . . . . . . accessory COMP . . . . . . . . . composition ELECT . . . . . . . . . . electrolytic
ADJ . . . . . . . . . . . . adjustment COMPL . . . . . . . . . . . complete ENCAP . . . . . . . . encapsulated k . . . . . . . . . . . . . . . . . . kilohm
AID ........ analog-to-digital CONN . . . . . . . . . . . connector EXT . . . . . . . . . . . . . . . external kV . . . . . . . . . . . . . . . . . kilovolt
CP . . . . . . . . . . cadmium plate F . . . . . . . . . . . . . . . . . . . farad Ib . . . . . . . . . . . . . . . . . . pound
CRT . . . . . . . cathode-ray tube FET . . . . field-effect transistor LC . . . . . . . . . . . . . inductance-
CTL . . . . . . . . . complementary . . . . . . . flip-flop capacitance
transistor logic LED . . . . . light-emitting diode
CW . . . . . . . . continuous wave
AL . . . . . . . . . . . . . . aluminum cw . . . . . . . . . . . . . . clockwise FM . . . . frequency modulation
ALC . . . . . . . . . automatic level cm . . . . . . . . . . . . . . centimeter FP . . . . . . . . . . . . . front panel LH . . . . . . . . . . . . . . . left hand
control D/A . . . . . . . . digital-to-analog FREQ . . . . . . . . . . . . frequency LIM . . . . . . . . . . . . . . . . . . limit
amplitude modulation dB . . . . . . . . . . . . . . . . . decibel FXD . . . . . . . . . . . . . . . . . fixed LIN . . . . . . . linear taper (used
. . . . . . . . . . . amplifier dBm . . . . . . . . decibel referred g . . . . . . . . . . . . . . . . . . . gram in parts list)
APC . . . . . . . automatic phase to 1 mW GE . . . . . . . . . . . . . germanium LK WASH . . . . . . lock washer
control dc . . . . . . . . . . . .direct current GHz . . . . . . . . . . . . .gigahertz LO . . . . . . low; local oscillator
ASSY . . . . . . . . . . . . assembly deg . . . . . degree (temperature GL . . . . . . . . . . . . . . . . . . glass LOG . . . . . . . logarithmic taper
AUX . . . . . . . . . . . . . . auxiliary interval or difference) GRD . . . . . . . . . . . . ground(ed) (used in parts list)
avg . . . . . . average ...' . . . . . . . . . . . degree (plane H .... ...... henry log ' . . . lcgarithm(ic)
AWG American wire angle) h .... . . . . . . . hour LPF . low pass filter
O . . . . . . . . . . degree Celsius
C HET . _ . . heterodyne LV . . . . low voltage
BAL . . . . . . . . . . . . . . . balance (centigrade) HEX . . . . . . . . . . . . .hexagonal m . . . . . . . . . . meter (distance)
BCD . . . . . . . . . . binary coded O . . . . . . . . degree Fahrenheit
F HD . . . . . . . . . . . . . . . . . .head mA . . . . . . . . . . . . . milliampere
decimal O . . . . . . . . . . . degree Kelvin
K MAX . . . . . . . . . . . . . maximum
BD . . . . . . . . . . . . . . . . .board DEPC . . . . . deposited carbon IiF . . . . . . . . . . high frequency M . . . . . . . . . . . . . . . . megohm
BECU . . . . . . beryllium copper DET . . . . . . . . . . . . . . detector HG . . . . . . . . . . . . . . . mercury MEG . . . . . . . meg (lo6) (used
BFO . . . . . . . . . beat frequency diam . . . . . . . . . . . . . .diameter HI . . . . . . . . . . . . . . . . . . .high in parts list)
DIA . . . . . . . diameter (used in HP . . . . . . . . . Hewlett-Packard MET FLM . . . . . . . . metal film
parts list) HPF . . . . . . . . . high pass filter MET OX . . . . . . metallic oxide
BKDN . . . . . . . . . .breakdown DlFF AMPL . . . . . . differential HR . . . . . . . . . . . hour (used in MF . . . . . . medium frequency;
BP . . . . . . . . . . . . . .bandpass amplifier parts list) microfarad (used in
BPF . . . . . . . . . bandpass filter div . . . . . . . . . . . . . . . . division HV . . . . . . . . . . . .high voltage
BRS . . . . . . . . . . . . . . . .brass DPDT . . . . . . . . . . double-pole, Hz . . . . . . . . . . . . . . . . . . Hertz manufacturer
BWO . . . . . . . backware-wave double-throw IC . . . . . . . . . integrated circuit mg . . . . . . . . . . . . . . . milligram
oscillator DR . . . . . . . . . . . . . . . . . .drive ID . . . . . . . . . . inside diameter
CAL . . . . . . . . . . . . . .calibrate DSB . . . . . . . double sideband IF . . . . . . . . . . . . .intermediate mH . . . . . . . . . . . . . . millihenry
ccw . . . . . . . counter-clockwise DTL . . . . . . . . diode transistor frequency mho . . . . . . . . . . . . . . . . .mho
CER . . . . . . . . . . . . . .ceramic logic IMPG . . . . . . . . . . impregnated min . . . . . . . . . . . minute (time)
CHAN . . . . . . . . . . . . . channel DVM . . . . . . . digital voltmeter in . . . . . . . . . . . . incandescent . . . . . . . . . . minute (plane angle)
cm . . . . . . . . . . . . . . centimeter ECL . . . . . . . . emitter coupled INCL . . . . . . . . . . . . .include(s) MlNAT . . . . . . . . . . . miniature
CMO . . . . . cabinet mount only logic I N P . . . . . . . . . . . . . . . . . . input mm . . . . . . . . . . . . . . millimeter
COAX . . . . . . . . . . . . . . coaxial EMF . . . . . electromotive force INS . . . . . . . . . . . . . . insulation
NOTE
All abbreviations in the parts list will b% in upper-case.
6-3
Replaceable Parts Model 8904A
Table 6-2. Abbreviations (2 of 2)
MOD .... modulator OD ........ outside diameter TD .............. time delay
MOM . . . . . . . . . . . momentary OH . . . . . . . . . . . . . . oval head TERM ............. terminal
OP AMPL . . . . . . . operational TFT ...... thin-film transistor
amplifier TGL ................ toggle
. . . . . . . . . option RECT .............. rectifier THD . . . . . . . . . . . . . . . . thread
....... oscillator . . . . reference THRU . . . . . . . . . . . . . through
O X . . . . . . . . . . . . . . . . . . oxide REG ............. regulated TI . . . . . . . . . . . . . . . . . titanium
device) . . . . . . ounce REPL .......... replaceable TOL ............. tolerance
mV ................ millivolt
mVac . . . . . . . . . . . millivolt, ac peak (used in parts
interference TTL ..... transistor-transistor
PAM ........ pulse-amplitude RH ... round head; right hand logic
mVpp . . . . . . . millivolt, peak- modulation RLC ............. resistance- N ............... television
to-peak PC ........... printed circuit inductance- TVI .... television interference
mVrms ......... millivolt, rms PCM .... pulse-code modula- capacitance TWT ..... traveling wave tube
mW . . . . . . . . . . . . . . .milliwan tion; pulse-count RMO ....... rack mount only U . . . . . . . . micro (used
MUX . . . . . . . . . . . . . multiplex modulation r s . . . . . . . root-mean-square
m in parts list)
MY . . . . . . . . . . . . . . . . . mylar PDM . . . . . . . . . pulse-duration RND ................ round UF . . . . . . microfarad (used in
& . . . . . . . . . . . . microampere modulation ROM ..... read-only memory parts list)
pF . . . . . . . . . . . . . . microfarad pF . . . . . . . . . . . . . . . picofarad R&P . . . . . . . . . rack and panel UHF ..... ultrahigh frequency
pH . . . . . . . . . . . . . microhenry PH BRZ . . . . phosphor bronze RWV . . . . . . . reverse working UNDEF .......... undefined
PHL . . . . . . . . . . . . . . . Phillips voltage UNFEG . . . . . . . . unregulated
PIN . . . . . . . . positive-intrinsic- S ng parameter v ..................... volt
pV . . . . . . . . . . . . . . . microvolt negative S second (time) VA . . . . . . . . . . . . . voltampere
pVac .......... microvolt, ac ltage ... (plane angle) Vac ............... volts, ac
pVdc . . . . . . . . . . microvolt, dc peak S-B ........ slow-blow (fuse) VAR . . . . . . . . . . . . . . . variable
@Vpk . . . . . . . . microvolt. peak lock (used in parts list) VCO ...... voltage-controlled
pVp-p . . . . . . . microvolt, peak- PLO . . . . phase lock oscillator SCR ....... silicon controlled oscillator
to-peak PM . . . . . . . phase modulation rectifier; screw Vdc ............... volts, dc
pvrms ........ microvolt, rms PNP . . . . . . positive-negative- SE ............... selenium VDCW . . . . . volts, dc, working
pW .............. microwatt positive SECT ............. sections (used in parts list)
P/O . . . . . . . . . . . . . . . . part of
POLY . . . . . . . . . . polystyrene
PORC . . . . . . . . . . . . porcelain SI .................. silicon oscillator
POS . , . , . positive: position(s) S I L . . . . . . . . . . . . . . . . . . silver VHF ..... very-high frequency
(used in parts list) SL . . . . . . . . . . . . . . . . . . . slide
POSN ............. position SNR . . . . signal-to-noise ratio
SPDT .......... single-pole, Vrms . . . . . . . . . . . . volts, rms
N/O . . . . . . . . . . normally open p-p . . . . . . . . . . . peak-to-peak double-throw VSWR ...... voltage standing
NOM .............. nominal SPG ................ spring wave ratio
NORM . . . . . . . . . . . . . normal in parts list) SR ............... splitring VTO . . . . . . . . . . . voltage-tune
NPN negative-positive- PPM . . . . . . . . . pulse-position SPST single-pole, oscillator
modulation W VTVM . . . . . . . . . vacuum-tube
NPO . . . . . . . negative-positive PREAMPL . . . . . . preamplifier SS ........... Service Sheet voltmeter
zero (zero tempera- PRF . . . . . . . . pulse-repetition SSB . . . . . . . . single sideband V(X) ......... volts, switched
ture coefficient) frequency w . . . . . . . . . . . . . . . . . . . . wan
NRFR . . . . . not recommended PRR . . . . pulse repetition rate STL ......... w l . . . . . . . . . . . . . . . . . . . with
for field replacement ps . . . . . . . . . . . . . picosecond WIV . . . . . . . . working inverse
NSR . . . . . . . . . not separately PT . . . . . . . . . . . . . . . . . . point SWR . . . . standing-wave ratio voltage
replaceable PTM . . . . . . . . . . . . pulse-time SYNC . . . . . . . . . . synchronize WW ............ wirewound
ns . . . . . . . . . . . . . nanosecond modulation T . . . . . timed (slow-blow fuse) W/O ............... without
nW ..... . . . nanowatt PWM . . . . . . . . . . . pulse-width TA tantalum YIG ...... yttrium-iron-garnet
OBD .... order by description modulation TC ............ temperature Z, . . . . . . . . . . . characteristic
compensating impedance
NOTE
All abbreviations in the parts list will be in upper-case.
MULTIPLIERS
Abbreviation Prefix Multiple
T tera 10'2
G gigs 109
M mega 106
k kilo 103
da deka 10
d deci 10-1
C centi 10-2
m milli 10-3
P micro 10-6
n nano 10-9
P pic0 10-12
f femto 10-'5
a ano 10-18
6-4
Model 8904A ReplaceabIe P r s
at
Table 63'.
Replaceable Parts
Reference HPPart C Qty. Description llfr- Mtr. Part Number
Designation Number D Code
A1
2 71ZA to 291 7A
SEE SECTION 7 KXI FRONT PANEL RETRoFlTWT
Alt
2025% and abwo
AI 08904-60201 4 1 KEYBOARD ASSEMBLY 28480 08804-60201
w1 NOT SEPARATELY REPLACEABLE
A2
2712A to 2942A
A2 0890480102 4 1 DIGITAL ASSEMBLY ( W
N 28480 08904-60102
A2 08904-69102 2 1 DIGITAL ASSEMBLY (RESTORED) 28480 089066Q102
2048A and a h
A2 08904-60202 5 1 DIGITAL ASSEMBLY (NEW) 28480 08904-60202
A2 08904-89202 3 1 DIGITAL ASSEMBLY (RESTORED) 28480 08904-69202
2712A to 2M2A
A2BTl 14200281 2 1 BA'ITERY 2.8V .46A%IR US-DIOX PIN 28480 14200281
3050.0990 7 3 WASHERFL NM NO.000 .WlN-ID .25-IN-ID 28480 30504990
2712A to 2942A
A2BTl 14200238 0 1 BAlTERY 3V 1.2AHR L M I U M POLYCARBON 28480 14204338
2 712A to 2 732A
A2u12 i
. REFER TO SECTION 7
A2U13 t REFER TO SECTION 7
2737A to 2942A
0890487010 9 1 EPROM 28480 0890487010
AZUlZt
A2U13 0~90487008 5 1 EPROM 28480 08904-87008
2737A to 294OA
A2u12 0890487009 6 1 EPROM 28480 0890487009
2742A and a h
A2u12 0890487011 0 1 EPROM 28480 089048701 1
2737A andabwo
A2U13 NO LONGER SEPARATELY REPLACEABLE
t R e f e r to Section i f o r u p d a t e information * F a c t o r y Selected C o m p o n e n t (Refer t o Section 5). A E r r a t a p a r t change.
rev.01JUL91 6-5
Replaceable Parts Model 8904A
fible 6-3. Replaceable Parts
Reference HPPart C Q ~ . Description Mfr- Mfr. Part Number
Designation Number D Code
A3
2712A to 2942A
A3 08904-60103 5 1 OUTPUT ASSEMBLY (NEW) 28480 08904-60103
A3 08904-69103 3 1 OUTPUT ASSEMBLY (RESTORED) 28480 08904-69103
2948A and abow
A3 0890440203 6 1 OUTPUT ASSEMBLY (NEW) 28480 08904-60203
A3 08904-69203 4 1 OUTPUT ASSEMBLY (RESTORED) 28480 08904-69203
A3C1 NOT ASSIGNED
A3C2 01804116 1 11 CAPACITOR-FXD 6.8UF+-10% 35VDC TA 56289 150D685X903562
A3C3 0160-4832 4 35 CAPACITOR-FXD .OlUF +-1O% lWVDC CER 28480 0160-4832
A3C4 0160-4832 4 CAPACITOR-FXD .OlUF +-loo/. lWVDC CER 28480 01604832
A3C5 0160-4832 4 CAPACITOR-FXD .OlUF +-lo% 1WVDC CER 28480 0160-4832
A3C6 0160-4832 4 CAPACITOR-FXD .OlUF +-1oO/c lOOVDC CER 28480 01604832
A3C7 NOT ASSIGNED
A3C8 0160-4535 4 9 CAPACITOR-FXD 1UF +-10% 50VDC CER 28480 0160-4535
A3C9 NOT ASSIGNED
A3C10 01604535 4 CAPACITOR-FXD 1UF +-1O% 5OVDC CER 28480 0160-4535
A3C11 0160-4535 4 CAPACITOR-FXD 1UF +-lo% 50VDC CER 28480 0160-4535
A3C12 0160-4535 4 CAPACITOR-FXD 1UF +-lo% 50VDC CER 28480 0160-44535
A3C13 01804116 1 CAPACITOR-FXD 6.8UF+-10◦ Jabse Service Manual Search 2024 ◦ Jabse Pravopis ◦ onTap.bg ◦ Other service manual resources online : Fixya ◦ eServiceinfo