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SERVICE INFORMATION FROM HEWLETT-PACKARD
1 st Quarter 1990
e
The 1990 Changes in National
Reference Standards
On January 1,1990, the U.S. National fined. Minor changes are being made
Institute of Standards and Technol- to the standards of capacitance and
ogy (NIST), and other national stan- mass maintained in some countries;
dards organizations worldwide made however, the magnitude of these ad-
important changes to the assigned justments, like the watt, is only of
values of national reference standards academic interest to most users.
in most countries of the world. Figure 1. The U.S. National Conference of
In most countries, an increase in the Standards Laboratories (NCSL) sticker for
volt of 8.1 parts per million (ppm) oc- indicatingequipment that is calibrated or
Calibration and Traceability curred. In the U.S.A., the increase of adjusted to the new unit representations.
9.3 ppm and in France, 6.7 ppm. All
Regular calibration assures that a values of dc and ac voltage were af-
measuring instrument meets the fected equally in any one country. The
user's expectation of performance, as ohm changed value in all countries,
defined by the instrument's pub- except Australia, by different
lished specifications. To ensure amounts - typically an increase of 1 HP 740A/B DC StandardDifferen-
worldwide consistency, calibration to 2 ppm. All values of resistance are tial Voltmeter
measurements are referenced (trace- equally affected.
able) to common defining base units rn HP 2804A Quartz Thermometer
in the International System of Units. with HP 18110A or HI' 18111A
The IPTS-68 became the International Laboratory Probes
Temperature Scale 1990. The change
It is the task of the national standards is rather more complex than for the rn HP 2813B/C/D/E Quartz Pressure
laboratories to maintain measure- electrical units. Both the magnitude Probes and Sets
ment units as practical reference stan- and polarity of the changes vary rn HP 3235A Switchmest Unit with
dards derived from the base unit defi- throughout the scale. HP 34520A/B 6 z Digit Multimeter
Y
nitions. However, experiments made Module, or HP 34521Ah3 AC/DC
over the past two decades have led Hewlett-Packard recommends that Source module
to international consensus that the you seek further information regard-
values assigned to certain "legal" or rn HP 3245A Universal Source
ing all of these changes through the
"as-maintained" standards in most national standards laboratory from rn HI' 3420A/B DC Differential Volt-
countries are in error. On January 1, which the traceability of your mea- meter/Ratiometer
1990, national laboratories through- surements is gained.
out the world adjusted these assigned rn HP 3455A Digital Voltmeter
values to eliminate the error. W HP 3456A Systems DVM
Affected HP Equipment rn HP 3457A Multimeter
Extent of the Change
Most equipment is not noticeably af- rn HP 3458A Multimeter
The electrical units affected are the fected. Affected applications are HP 3478A Multimeter
volt and ohm. Relationships between those where measurement accuracies
rn HI' 3497A Data Acquisition/Control
the units mean that the ampere and are within 10 times the magnitude of
watt are also affected although the the change. The following HP prod- Unit with Option 001 (HP 44420A
change in the watt is likely to be insig- ucts have specified accuracies that are 5% Digit DVM and Current Source)
nificant to commerce. In addition, the compromised, and HP recommends rn HP 3852A Data AcquisitiodControl
International Practical Temperature that they be calibrated to the new Unit with HP 44701A 5% to 3%
Scale 1968 (IPTS-68) is being rede- standards. Digit Integrating Voltmeter
(See "ReferenceStandark"page 16)
Pub. NO.5952-0135 @ Hewlett-Packard 1990
WWW.HPARCHIVE.COM
Service Tip
Attention HP 8757C/E Network Analyzer Owners
Editor's Note: This service tip also
applies to many other instruments that
use the new 7.5 inch color monitor.
As with all color monitors, these dis-
plays are very susceptible to external
magnetic fields. These fields can origi-
nate from many sources, including
metal-frame tables and from the earth
itself. The usual symptom is a discol-
oration or slight dimming of the dis-
play, usually near the top left hand
corner of the CRT. In extreme cases,
a total color shift may be observed;
for example, a trace that was red may each time the unit is turned on, is none of these are available, an electric
shift to green. This does not indicate sufficient to maintain color purity. In pencil sharpener will usually act as a
any problem with the display; it is some cases, especially after the instru- reasonably good substitute for a de-
characteristic of all color displays. In ment is moved or repositioned, it may gaussing coil. Use the electric pencil
fact, you can take a perfectly good be necessary to cycle the power sev- sharpener in the same manner as pre-
display, turn it upside-down on a eral times to regain color purity. viously described.
metal table, and usually see some dis-
coloration. This is most visible while If the automatic internal degaussing For best results, the CRT should be
viewing a solid red test pattern. is insufficient to regain color purity, degaussed in the exact position in
the CRT will have to be degaussed which it will be used. Always make
While every effort is made to ensure using a commercially available CRT sure any magnetic tapes or disks are
the display is free of any residual mag- degaussing coil. If a commercial de- removed from the immediate area or
netism, changing the instrument's lo- gaussing coil is not available, a bulk you may demagnetize more than just
cation or orientation may affect magnetic tape eraser (such as Radio the CRT! In summary, we recom-
magnetic fields enough to cause color Shack #44-232 @ $19.95) can be used mend that you do not replace any
purity problems. This may be espe- if it is held about four inches from the color display for color purity or mis-
cially noticeable in the southern face of the CRT. Only bring it closer convergence problems unless it has
hemisphere. Generally, the built-in than four inches if this distance is in- first been completely degaussed
degaussing coil, which is engaged sufficient to regain color purity. If using one of the above methods. 0
Service Tip
HP 5371A Service Kit Provides Everything You Need to Service
and Learn the HP 5371A Frequency and Time Interval Analyzer
The HP 5371A Service Kit, which in- and troubleshoot the HP 5371A to
cludes manuals, is now available to component level. The service kit in-
aid in servicing the HP 5371A Fre- cludes the following:
quency and Time Interval Analyzer.
Note that the service manual and kit rn Extender boards and cables
do not come with the HP 5371A, but rn HP-IB operational verification disks
must be ordered as options when pur- (both 5lA-inch and 3%-inch for
chasing the instrument, or later as Series 200/300 controllers)
part numbers:
Service training video tape
rn Operating, programming, and ser-
vice manuals
erviceManua1 Opt. 915 05371-60001 The service training video tape is de- products that are seen frequently. The
ervice Kit Opt. OKP 05371-67001 signed for both customers and HP HI` 5371A is not a frequent visitor to
technicians. While seminars are very a bench technician; therefore, this 23-
The service kit must be used in order useful in training technicians to make minute video tape is a more effective
to perform adjustments, calibrate, repairs, seminars are most useful for way of providing service training.
(continued on page 3)
2 BENCH BRIEFS 1ST QUARTER 1990
WWW.HPARCHIVE.COM
(continued from page 2)
The tape describes: 8 How to use the service manual to To service the HP 5371A. vou must
repair the faulty assembly have the HP 5371A Servic; Kit, HP
8 What the instrument does
c 8 How to operate the instrument
8 How the instrument works
The tape is 23 minutes and 30 seconds
in length and is available on VHS cas-
settes for both NTSC and PAL stan-
P/N 05371-67001. Both formats of the
video tape are included with each ser-
vice kit.
8 What diagnostics are available dards. The NTSC VHS tape is avail-
able as HI' P/N 05371-13304. The PAL
8 How to use the diagnostics VHS tape is available as HP P/N Contact your local HP sales/service of-
8 How to locate the faulty assembly 05371-13305. fice for ordering information. 0
Recommended Reading
New Instrument Support Literature
Explains Hewlett-Packard's
On-Site Instrument Service Programs
Two new pieces of literature have just ment services, features, benefits, and
been introduced to explain HP's on- specifications.
site instrument service offerings. The
two new pieces are: The On-Site Calibration Service data
sheet describes HP's line of on-site
calibration agreements, including
8 HP SuccessLine Service technical data both commercial as well as military
r sheet for on-site instrument and
measurement systems (HP P/N
5952-1512)
standard levels of service. This docu-
ment supersedes a previous data
sheet, H P On-Site Milita y Standard
8 On-Site Calibration Service data sheet Calibration Service, with the same HP
(HP P/N 5959-2595) part number.
For more information on Hewlett-
The HP SuccessLine Service data sheet Packard's on-site instrument and
describes on-site instrument and measurement system service pro-
measurement system repair service, grams, contact your nearest HP sales/
and provides details on repair agree- service office. 0
Updated Customer Service Center Guide is Now Available
The February 1990 edition of the H P tion services available at HP Cus-
Customer Service Center Guide is now tomer Service Centers and sum-
available. The guide contains prices marizes service features in handy
for all return-to-HP contract and per- selection guides. The book includes a
incident services for instruments and tear-out short-form exhibit that cus-
office products and peripherals. Also tomers can complete and mail in to
included is the recommended calibra- initiate a service contract. The remain-
tion cycle period for each applicable der of the book lists, in three sections,
product. The prices in the book are commercial instrument service prices,
effective February 1, 1990. MIL-STD 45662 instrument se-rvice
prices, and office product service
New for this edition is a reader feed- prices.
f back form that we hope will provide
a basis for continued improvement of
the guide. As in previous editions, Contact your local HI' sales/serviceof-
the front section of the guide des- fice for a copy of this guide, HP P/N
cribes the various repair and calibra- 5954-9715. 0
1ST QUARTER 1990 BENCH BRIEFS 3
WWW.HPARCHIVE.COM /
r ?
More on Fabricating Breadboard
Circuits with Copper Tape
Copper Tape Update pedance levels. Note that these condi- issue of Ham Radio Magazine. It de-
tions hold for single-side copper scribed round rod interdigital filters
Editor's Note: The following letter was plated PC boards with the solid cop- as opposed to microstrip filters.
received from Bernie Coler, an HP em- per acting as the stripline ground
ployee and Bench Briefs' reader. plane. Rick Campbell (KK7B) has published
several similar articles on bandpass
When undercutting copper from filters, and how a microwave local os-
Dear Editor, around a hole, using a standard drill cillator can be built with a diode mul-
bit can cause problems. Because of the tiplier. However, none have ever ap-
Many thanks for Bench Briefs - one angle of the tip of the drill-bit, the peared in Ham Radio Magazine. His
of my favorite HI` periodicals, and for result can often be torn copper, hole earliest article was in the Proceedings
the latest article on using copper tape enlargement, and/or damage to sur- of 1296-2304 Conference, which is not
for breadboarding. I have used this
technique for many years to construct
breadboards for my hobby, Ham
rounding areas. Copper has always
been a difficult metal to machine. A
available in print. Luckily, much of
the material was repeated in later /7
recommended solution is to use a V8- papers:
Radio, and want to pass along a few inch diameter end-mill. These end-
tips. mills are commonly available and will
fit the chuck of most drill presses. An "A No-Tuning Crystal Controlled
Copper tape of 1-inch or 3/4-in~h width Microwave Local Oscillator," Pro-
acceptable alternative is to grind the
can be tricky. Cutting smooth, uni- angled tip of a standard %-inch drill ceedings of the 21st Conference of the
form-width strips is neither easy, nor bit until the tip is straight across. Central States VHF Society, July 1987.
inconsequential. There are several Publication #76 of the American
sources of copper tape of widths YE, I hope these tips can help others. Radio Relay League, ISBN: 0-87259-
%, and/or %-inches. In the U.S. such 066-6.
sources are hobby shops where these
tapes are sold to hobbyists with in- "9 and 13 cm. Transverters," Proceed-
Referenced Microstrip Filter ings of Microwave Update `87, Sep-
terests in model railroading and/or
doll-house construction. The copper
Articles Are Located tember 1987. Publication #78 of the
strips are used as wiring for lighting, American Radio Relay League, ISBN:
control, etc. This tape is also sold Editor's Note: The following letter was 0-87259-068-2.
through electronic parts distributors received from Mr. J. H . Davey
for PC board building. However, I (WA8NLC). It provides an update on Also included in the Microwave Up-
have found that the hobby shops sell where to find the filter articles referenced date `87 is the James Davey paper on
the tape at much lower prices with no in the 1st Quarter 1989 issue of Bench the 5-pole quarter-wave hairpin filter,
difference in quality that is discernible Briefs. with a follow-up paper printed in the
to me. 1988 Microwave Conference Proceed-
Dear Editor, ings. Each of these proceedings can
Depending upon board thickness and be purchased for approximately
material, I've found that either the Y8- Thought I had better write and give $10.00 from the American Radio Relay
inch or %-inch varieties will provide you information on the location of the League in Newington, Connecticut.
good 50 ohm impedance match at fre- filter articles references in Bench Briefs.
quencies up through mid S-Band. The I hope this information will be of some
Vi6-inch strips are used for bias inputs The article written by Jerry Hinshaw help. I look forward to hearing from
because they match much higher im- (N6JH) appeared in the January 1985 Mr. Kristiansen. 0
4 BENCH BRIEFS 1ST QUARTER 1990
WWW.HPARCHIVE.COM
with serial numbers 2804U00846/
Safety-Related Service Notes 2804U00976. This note requests the
user to check that the line fuse is the
Service notes from HP relating to per- This note requests the user to check correct value for 100/115 volt opera-
sonal safety and possible equipment that the line fuse is the correct value tion. The fuse should be rated as a
damage are of vital importance to our for 100/115 volt operation. The fuse 1.OA Slo-Blo (HP P/N 2110-0001).
customers. To make you more aware should be rated as a 100mA Slo-Blo
of these important notes, they are (HP P/N 2110-0234).
printed on paper with a red border,
and the service note number has an HP 85901A AC Power Source
"-S" suffix. In order to make you im- HP 436A Power Meter, Option
mediately aware of any potential 903 or 918 Product Safety Service Note 85901A-
safety problems, we are highlighting 01-S applies to HI' 85901A sources
safety-related service notes here with Product Safety Service Note 436A-13- with serial numbers 2845K00101/
a brief description of each problem. S applies to HP 436A Power Meters 2906K00240. This note describes how
Also, in order to draw your attention with serial numbers 2709U04803/ an inductor causes a large voltage
to safety-related service notes in the 2709U05040. This note requests the transient at turn-on and turn-off,
service note index, each appropriate user to check that the line fuse is the which might be sufficient to destroy
safety-related service note is high- correct value for 100/115 volt opera- a diode in the inverter circuit. If the
lighted with a contrasting color. tion. The fuse should be rated as a diode is destroyed, the inverter
750mA Slo-Blo (HP PIN 2110-0063). switch will not turn the inverter off.
The inverter indicator LED continues
HP 435B Power Meter, Option to indicate that the inverter is on.
903 or 918 HI? 438A Power Meter, Option
903 or 918 The repair procedure involves remov-
Product Safety Service Note 435B-04-S ing the inductor and replacing the
applies to HP 4358 Power Meters with Product Safety Service Note 438A-07- diode. Order the service note for
serial numbers 2732U04341/2732U04700. S applies to HP 438A Power Meters further instructions. 0
c I
Important Notice about Service Notes
Service notes contain product-specific Bench Briefs Library 5951-6511
service information for Hewlett- If you want to order a service note, Update service 5951-6517
Packard's electronic products. Sub- refer to the list of service notes in the
jects include product improvements, index, find the service note number Please note that automatic shipments
modifications, and procedures for belonging to the product you are in- of the update service will no longer
troubleshooting, maintenance, and terested in, and note the package be made. If you want to continue to
repair. Service Notes are published as number. Use the form on the last page receive quarterly updates to the
appropriate throughout the life of a of Bench Briefs to order the number microfiche library, you must place a
product. All new notes are an- that appears in the "service note pack- new order during the first month of
nounced in Bench Briefs. age" column. You will receive a pack- each quarter (May, August,
r Please note that Hewlett-Packard has
restructured the procedure for hand-
age of service notes that includes the
one you ordered.
Microfiche
November, February). Note that in-
ventory will be purged at the end of
each quarter.
ling and distributing instrument-re-
lated service notes through Bench Service notes are still available on Contact your local HP saledservice of-
Briefs and the microfiche program. microfiche. The part numbers are: fice for more information. 0
1ST QUARTER 1990 BENCH BRIEFS 5
WWW.HPARCHIVE.COM
- .__I_ --
1989 Bench Briefs' Instrument
Service Note Index
SN SN Abstract Service Note
Type No. Package
IO 141T-14 Description of l i e filter kits available as replacements for obsolete line filters 006
IO 432C-05 Graylex Industries offers to repair defective front panel meter display module 004
IO 435A-07A Preferred replacement for capacitors A3C13 and A3C14 013
SA 435B-04-S Need to install correctly rated fuse for 100/115 volt operation 012
IO 435B-04 Preferred replacement for capacitors A3C13 and A3C14 013
SA 436A-13-S Need to install correctly rated fuse for 100/115 volt operation 012
MA 436A-14 Modification to improve high speed communications 004
IO 436A-15 Preferred replacement for capacitors A8AlC13 and A8AlC14 013
MA 436A-16A Recommended replacement display driver assembly 015
IO 436A-16 Obsolete display driver (HP P/N 1820-1361) is no longer available 014
MA 437B-01 New replacement capacitors for the old Polystyrene capacitors 013
IO 437B-02 Preferred replacement for capacitors A4C38 and A4C39 013
MR 438A-05A Firmware upgrade to enhance accuracy in MNL FILTER mode 002
SA 438A-07-S Need to install correctly rated fuse for 100/115 volt operation 012
MR 438A-08 Firmware upgrade to correct certain malfunctions 002
MA
IO
438A-09
438A-11
New replacement capacitors for the old Polystyrene capacitors
Preferred replacement for capacitors GlAlC13 and GlAlC14
013
013
?
MR 165OA-06 Modification to improve the quality of the CRT display 005
IO 1650A-07 Testing procedure for the Probe Tip Assembly P/N 01650-61608 014
IO 165OA-08 System Bd. svc. procedure for logic anal. with 10449A ACCENT upgrade kit installed 016
MR 165lA-06 Modification to improve the quality of the CRT display 005
IO 165lA-07 Testing procedure for the Probe Tip Assembly P/N 01650-61608 014
IO 165lA-08 System Bd. svc. procedure for logic anal. with 10449A ACCENT upgrade kit installed 016
IO 2804A-04 2804A A2 OscillatorE'reset board replacement procedure 011
IO 3235A/E-08 New service manual encompasses new hardware accessories 014
MR 3235A/E-09 New firmware allows the 34516A 256-Crosspoint Matrix Module to pass FT'EST 014
IO 3455A-26 HP 9830 and 9825 service cassette tapes are being obsoleted 008
IO 3455A-27 Design change to accommodate obsoleted LED 014
MA 3457A-10 Improved design eliminates mechanical failures of battery 004
IO 3457A-11 HP-85 service cassette tape is being obsoleted 008
MR 3457A-12 Modification to allow 3457 to respond to external trigger, esp. from the 3497A 015
MR 3458A-01A Modification to improve A/D linearity 014
MR 3458A-01B Modification to improve A/D linearity during "turnover" linearity test 015
MR 3458A-01 Modification to improve the A/D linearity 009
MR 3458A-02A Fixes, changes, and enhancements to outguard firmware (Rev. 3.0) 015
MR 3458A-02 Firmware fures, changes, and enhancements to outguard ROMs 009
MR 3458A-02 Fixes, changes, and enhancements to the outguard firmware (Rev. 3.0) 014
MR 3458A-03A Fixes, changes, and enhancements to outguard firmware(Rev. 4.0) 015
MR 3458A-03 Fixes, changes, and enhancements to the outguard firmware (Rev. 4.0) 014
IO 3466A-17 Notification of slight change in accuracy specification (20 ohms range) 015 -1
MA 3466A-18A Modifications that improve ESD and overvoltage protection of multimeters 010
6 BENCH BRIEFS WWW.HPARCHIVE.COM 1ST QUARTER 1990
SN SN Abstract Service Note
Type No. Package
/"
! MA 3466A-18 Mechanical and electrical design change to improve ESD & overvoltage protection 008
IO 3466A-19 Slight change in accuracy specification (20 Ohms Range) 016
IO 3468A/B-05 HP-85 service cassette tape is being obsoleted 008
IO 3478A-08 HP-85 service cassette tape is being obsoleted 008
IO 3497A-30 HP-85 service cassette tape is being obsoleted 008
MR 3498A-05 Modification to reduce crosstalk in outguard decoder lines 009
IO 3552A-17A Preferred replacement for 12V battery packs (requires resistor changes 010
MR 35653-06 Mod. to A5 Pwr. Supply controller so that system powers up with 8 boards installed 015
MR 3708A-09A PROM retrofit kit (03708-60006) is a preferred replacement for PROM failures 007
MR 3708A-14 Test switch replacement to prevent intermittentblanking of front panel display 008
IO 3708A-15 Simplification of performance test tables 4-4 & 4-5 in the HP 3708A Service Manual 008
IO 3708A-16 Service manual correction to insert additional step in Performance Test 4-30 015
IO 3709B-03 Preferred replacement for the Timer IC (A2U9) on the Analogue Assembly 008
IO 3746A-30 Notification to disconnect pwr. cord before remhser. A41/43 to prvnt. fuse fail 005
IO 3746A-31 Correction to part of the Weighted Filter (Option 016) specification 005
MR 3746A-32 Two resistor changes to make the A99 Motherboard backward compatible 005
IO 3746A-33 Correction to the Tracking Generator A54 (Option 012) adjustment procedure 005
IO 3746A-34 Preferred replacement for the fractional N integrated circuit (A3OU16) 010
IO 3750A-01 Correction to frequency/accuracy specs. in 3750A Op. Note 005
MR 3762A-10 Modification to clock and data amplitude range 016
IO 3776A-34 Notification of preferred replacement RAM due to parts unavailability 005
IO 3776A-35 Preferred replacement for capacitor A5C107 on the A5 transients assembly 007
IO 3776B-41 Notification of preferred replacement RAM due to parts unavailibility 005
IO 3776B-42 Notification of preferred replacement IC on assembly A102 005
IO 3776B-43 Preferred replacement for capacitor A5C107 on the A5 transients assembly 007
IO 3779A-35 Recommended replacement procedure for rear signaling panel sub-assembly 008
IO 3779A-60 Recommended alternativetest equipment for 3779A performance tests 015
IO 3779B-36 Recommended replacement procedure for rear signaling panel sub-assembly 008
IO 3779B-64 Recommended alternativetest equipment for 3779B performance tests 015
** 3779C-41 Recommended replacement for "High-linevoltage protection circuit" 002
MA 3779C-42 Instructions on converting 3779C Opt. 003 to 3779C Opt. 001 or 002 010
** 3779D-41A Modification to convert Option 002 to Option 001 002
** 3779D-46 Recommended replacement for "High-linevoltage protection circuit" 002
MR 3780A-35 Modification to correct failure of smoothing capacitors 013
MR 378lA-06 Modification to correct failure of smoothing capacitors 013
MR 3781B-12 Modification to correct failure of smoothing capacitors 013
MR 3782A-08 Modification to correct failure of smoothing capacitors 013
MR 3782B-13 Modification to correct failure of smoothing capacitors 013
IO 3785A-22 Replacement (1826-0252) for the DAC (A35U27 & A38Ull) has better linearity 007
MR 3785A-23 Recommended modification if receiver lock fails on 8 MHz of 34 MHz bit rates 007
MR 3785A-24 Modification to correct failure of smoothing capacitors 013
** 3785B-18A Modification to improve reliability 002
IO 3785B-20 Replacement (1826-0252) for the DAC (A35U27 & A38Ull) has better linearity 007
MR 3785B-21 Recommended modification if receiver lock fails on DS2 or DS3 bit rates 007
MR 3785B-22 Modification to correct failure of smoothing capacitors 013
MA 3787B-03A Instructions for adding DS1 Jitter Measurement option to 3787B units 010
MA 3787B-04C How to order and install new fvmware that adds new features to old units 010
r
1ST QUARTER 1990 WWW.HPARCHIVE.COM BENCH BRIEFS 7
SN SN Abstract Service Note
Type No. Package
?
MA 3787B-04D Additional features that can be retrofitted to older instruments 014
IO 3787B-05 CRT Window/Bezel now combined under one part number (03787-60073) 005
IO 3787B-06 New fan filter can be retrofitted to older instruments 008
IO 3787B-07 Instructions for retrofitting Option 002, Low Voltage DC Supply to standard inst. 015
IO 3787B-08 Instructions for building and testing DDS bithyte clock generator assembly 015
MA 3789B-04 Modification to eliminate noise from the input port 015
MR 3789B-05 Recommended PROM Update Kit Firm 1to improve performance 016
MR 4062C/UX-01 Modification to prevent power supply cable damage of the 4142B 015
MR 4142B-03 Modification to prevent power supply cable damage 015
IO 419lA-25A Recommended replacement for the A20 MicroprocessorDigital Control Board 013
IO 419lA-25 Recommended replacement for the A20 MicroprocessorDigital Control Board 012
IO 419lA-26 Repair method for the A20 Microprocessor Digital Control Board 013
IO 4192A-20A Repair method for A6 MicroprocessorDigital Control Board 016
IO 4192A-20 Repair method for the A20 MicroprocessorDigital Control Board 013
MR 4195A-OlA Firmware upgrade to that the HP 4195A Adjustment Program will work 008
IO 4195A-02A Cable length selection is not needed 008
MA 4195A-03 Mod. to improve local osc. purity and color dump capability for PaintJet Printer 008
MR 4195A-04 A l l Input Attenuator Boards must be replaced when any of them are replaced 016
IO 4276A-04 Instructions for replacing a fuse-resistor with a fured resistor 016
IO 4277A-08 Instructions for replacing a fuse-resistor with a fured resistor 016
MR 4278A-02 Firmware changes correct HP-IB system hang up 012
MR 4278A-03 Mod. to trigger 4278A in Manual Trigger Mode when HP-IB is set in Talker Mode 015
MR 4278A-04 Mod. to correctly load measurement conditions from external memory card 015
MR 4278A-05 Modification to prevent drift during 1kHz CapacitanceAccuracy Test 015 7
MA 4284A-01 Instructions on installing Option 001 to the standard 4284A 013
MA 4284A-02 Instructions on installing Option 002 to the standard 4284A 013
MA 4284A-03 Instructions on installing Option 006 to the standard 4284A 013
MA 4284A-04 Instructions on installing Option 201 to the standard 4284A 013
MA 4284A-05 Instructions on installing Option 202 to the standard 4284A 013
MA 4284A-06A Instructions for retrofitting Option 301 to standard unit 015
MA 4284A-06 Instructions on installing Option 301 to the standard 4284A 013
MR 4284A-07 Modification to ease the extension of the A3 board for adjustments 015
MR 4284A-08 Mod. to prevent HP-IB lock-up with either *LRN? or correction query commands 015
MR 4925B-01 Modification to prevent an intermittent power-on display anomaly 010
IO 4934A-02 Instructions on installing battery operation (Opt. 001) to standard units 010
IO 4934A-03 Service manual correction to Step 2 of the Transmitter Flatness at -40dBm test 015
IO 4935A-03B Battery retrofit and upgrade 001
IO 4935A-14A Withdraw of part alert (1826-0735) 001
IO 4936A-10 Preferred replacement diodes on the battery charger assembly 006
MR 4937A-02C Loop start and noise-to-ground modification 002
IO 4947A-09 Notification of preferred replacement RAM due to parts unavailability 005
IO 4947A-10 Preferred replacement for capacitor A5C107 on the A5 transients assembly 007
MA 4948A-08 Preferred replacement for NMOS RAMSon A9 assembly 010
IO 495lA-19 Recommended replacement resistors if the display is dim 016
IO 4951B-04 Recommended replacement resistors if the display is dim 016
MR 4951C-08 Keyboard shifthontrol anomaly 001
MR 4951C-09 Instructions on replacing capacitors C43 and C83 006
3
8 BENCH BRIEFS 1ST QUARTER 1990
WWW.HPARCHIVE.COM
SN SN Abstract Service Note
Type No. Package
IO 4951C-10 Procedure corrects "disk not fomatted" error caused by head misposition 013
MA 4951C-11 Firmware revision 5.0 adds features around disk operation 014
MR 4952A-04 ASYNC clock fr u 001
MR 4952A-05 Replace AlU302 modulators that have bad date codes 001
MR 4952A-06 Polarity-reversed capacitor in deflector circuit causes vertical deflection prob. 010
IO 4952A-07A New, redesigned POD interface cable for the 4952A (only) 014
IO 4952A-07 New, redesigned POD Interface Cable for the 4952A (only) 013
MR 4952A-08A Modification to improve the current output of the power supply 014
MR 4952A-08B Modification to improve the current output of the power supply 016
IO 4952A-09 Option A4 memory DRAM change 013
IO 4952A-10 Procedure corrects "disk not formatted" error caused by head misposition 013
MR 4952A-11 Modification to reduce the current drain on the CIO chip (AlU209) 014
MR 4954A-05 Inspect and clean cable W7 to prevent displayjitter. 005
IO 4954A-06 List of disk control board replacements 014
MR 4954A-07 Modification required so the DLI board wl run Phase I1 software
il 016
MR 497lA-01 New receiver board F1 fuses 002
MR 497lA-02 Co-processorfirmware change to correct frame misalignment 006
MR 497%-01 New receiver board F1 fuses 002
IO 4972A-02 Disk control board repair identification 002
MR 4972A-03 Disk control board repair instructions 002
MR 497x44 Co-processor firmware change to correct frame misalignment 006
MR 5328B-03 Modifications to 5328Bs with DVM Option 021 to correct unstable readings 013
IO 5334A-05 Explanation of X10 attenuator trigger level accuracy being nominal 009
IO 5334B-01 Explanation of X10 attenuator trigger level accuracy being nominal 009
IO 5334B-02 Settingtrigger levels via HP-IB requires DACS ON (TR1) cmnd 013
IO 5334B-03 HP-IB test tape mod. prevents MATE "IL"or T I " cmnds. from generating error 9.4 013
MA 534OA-14B Directions for converting to LED digital display 016
IO 534OA-23 Instructions on repairing the 5340A counter when A22U1 fails (it cannot be replaced) 007
IO 5342A-54 Washer must be retained to prevent display problem 003
IO 5342A-55 SWR specifications listed in the manual are "typical" specifications 013
IO 5342A-56 Retrofit option information 013
IO 5342A-57 Option 001 Time Base specification change 014
MR 5343A-29 Modification to prevent A1 Display assembly from giving erroneous indications 014
IO 5343A-30 Instructions on troubleshooting 350 MHz miscounting problems 013
IO 537lA-OlA Content description for the Support Service Kit, P/N 05371-67001 013
IO 537lA-11 Possible modifications that might have to be made when the A5 board is changed 009
IO 537lA-12 Notification that the operation verification voltage readings are "approximate" 013
MR 537lA-13 Modification to ensure operation of oven oscillator in standby mode 016
IO 662lA-07/ Replacement PC board changes 002
IO 662lA-08/ Modification to correct microprocessor hangup 002
IO 6622A-05/ Replacement PC board changes 002
IO 6622A-06/ Modification to correct microprocessor hangup 002
IO 6623A-08/ Replacement PC board changes 002
IO 6623A-09/ Modification to correct microprocessor hangup 002
IO 6624A-06 Replacement PC board changes 002
IO 6624A-07/ Modification to correct microprocessor hangup 002
IO 6627A-01 Modification to correct microprocessor hangup 002
1ST QUARTER 1990 WWW.HPARCHIVE.COM BENCH BRIEFS 9
SN SN Abstract Service Note
Type No.
MR 84U6A-04 Line voltage clarification
Package
002
r
IO 8477A-03 Preferred replacement for AlQll and AlQ18 transistors 013
MA 8511A-02 Mod. kit to add IF switching capabilities for multiple test set oper. w/8510Bs 011
MA 8512A-05 Mod. kit to add IF switching capabilities for multiple test set oper. w/8510Bs 011
MA 8513A-03 Mod. kit to add IF switching capabilities for multiple test set oper. w/8510Bs 011
MA 8514AIB-01 Mod. kit to add IF switching capabilities for multiple test set oper. w/8510Bs 011
MA 8515A-03 Mod. kit to add IF switching capabilities for multiple test set oper. w/8510Bs 011
MA 8516A-04A Improved frequency converter requires new bias supply 008
MA 8516A-04 Improved frequency converter requires a higher bias supply voltage 006
MA 8516A-05 Modification to add step attenuators to 8516A standard or Option 003 models 009
MA 8516A-06 Mod. kit to add IF switching capabilities for multiple test set oper. w/8510Bs 011
** 8552B-1OA Assembly instructions for 8500 Series & 140T/141T Display 003
IO 8557A-09A Instructions on ordering replacement bandwidth filter board assemblies in kit form 006
** 8559A-11 Modification kit to make 8559A compatible with 853A Display 003
IO 8559A-33 Instructions on ordering replacement bandwidth filter board assemblies in kit form 006
** 8562A-02C ROM upgrade kit with latest firmware 003
** 8562A-23 High voltage warning 003
** 8562A-24 Modification to improve phase noise 003
** 8562A-25 Temporary resistor pack change - no change in operation 003
** 85624-28 Option 026 YTF compatibilitywith TAM 003
MR 8562A-47 Modification to prevent erroneous divide-by-two results (Error 600) 016
** 8562B-01C ROM upgrade kit with latest firmware 003
** 8562B-22 High voltage warning 003
** 8562B-23 Modification to improve phase noise 003
** 8562B-24 Temporary resistor pack change - no change in operation 003
MR 8562B-44 Modification to prevent erroneous divide-by-two results (Error 600) 016
** 8565A-19 Preferred replacement of RF-IF motherboard assembly 003
** 8566B-02 Instructions on installing Option 010 rack mounting slides 003
** 8566B-12A Installation procedure for 8566AB retrofit kit 003
** 8568A-44B Installation procedure for 8568AB retrofit kit 003
IO 8569A-13 Instructions on ordering replacement bandwidth filter board assemblies in kit form 006
** 8569B-10 +
Modification to prevent 158V fuse from blowing 003
IO 8569B-11 Instructions on ordering replacement bandwidth filter board assemblies in kit form 006
IO 857OA-01 Instructions on ordering replacement bandwidth filter board assemblies in kit form 006
** 8590A-07A Instructions on removinglmodifying analyzer display 003
** 8592A-09 Instructions on removinglmodifying analyzer display 003
MR 8642A/B-09 E t timebase input impedance mod. to prevent intermittent out-of-lock conditions
x. 008
MR 8642M-02 Modification to correct "All/A12 out of lock" errors 002
MR 8644A-01 Firmware upgrade to insure compatibility with exchange modules 012
MR 8645A-01 Firmware upgrade to insure compatibility with exchange modules 012
MR 8656B-08A Modification to improve low frequency loop reliability 006
MR 8656B-08B Modifcation to improve low frequency loop reliability 008
MR 8657A-OM Modification to improve low frequency loop reliability 008
MR 8657A-01 Modification to improve low frequency loop reliability 006
MR 8665A-01 Firmware upgrade to insure compatibility with exchange modules 012
MR 8673B-13A Connector modification to improve power supply reliability 003
MR 8673C-14Al Connector modification to improve power supply reliability 003
r
10 BENCH BRIEFS 1ST QUARTER 1990
WWW.HPARCHIVE.COM
SN SN Abstract Service Note
No. Package
F\1
Type
MR 8673D-15A Connector modification to improve power supply reliability 003
MR 877OA-17 Modification to prevent external clock from modulating internal 125 MHz VCXO 004
MA 877OA-18 Improved line switch resists breakage 014
MA 878OA-05A A2 RF Output Amplifier troubleshooting and replacement procedure 013
MA 8780A-05 A2 RF Output Amp troubleshooting & replacement procedure 002
MR 8780A-06 AC line fuse modification (increase in current rating) 005
MA 878OA-07A Troubleshootingand replacement procedure for A7 FM BB relays (A7A2Kl-K6) 006
MA 878OA-07 Instructions on troubleshooting and replacing A7A2Kl-K7 relays 005
IO 878OA-08 A change has been made to the front panel assembly to eliminate unnecessary parts 007
IO 8903B-04/ Description of exchange program for A2 input amplifier assembly 003
MR 8903B-05 Modification to prevent electrical damage to input circuitry 014
IO 8903E-04 Description of exchange program for A2 input amplifier assembly 003
MR 8903E-05 Modification to prevent electrical damage to input circuitry 014
MA 8970A-10B Isolator replacement kit improves measurement repeatability 006
MA 8970A-10B New Isolater replacement kit (08970-60035) improves measurement repeatibility 007
MR 8970B-03B New FL19 filter improves measurement repeatability 007
MA 8970B-04 Modification to increase + 5 Vdc power supply range 004
IO 8970B-05 Preferred replacement for diode A14CR4 005
IO 8980A-01 Firmware and A17 RAM Assembly replacement strategy 006
MA 898OA-02 Mod. to CRT switch board assy. to improve reliability of X,Y,Z cable connections 012
IO 898lA-01 List of firmware revisions 004
MR E122OA-01 Modification to prevent timing edge displacement caused by crosstalk 015
MR E1222M-01 Modification to prevent timing edge displacement caused by crosstalk 015
iT7 MR
MR
11990A-0lA
16500A-05A
Modifications to User Interface S o h a r e for HP 70900A System Performance tests
New cooling fans contain thermal lock rotor protection circuitry
006
014
MR 16500A-06 Modification to prevent instrument from randomly cycling power 005
IO 16500A-07 Instructions on component level repair of touchscreen 010
MR 16500A-08 New cooling fans containing thermal lock rotor protection circuitry 016
IO 16510A-01 Testing procedure for the Probe Tip Assembly P/N 01650-61608 014
MR 18160A-01B Modification to prevent turn-on and/or PV-loop POD errors 014
MR 18160A-01 Modification to prevent TURN-ON and/or PV-LOOP POD errors 005
MR 18177A-0% PODS associated with 4951C/52A products have misloaded capacitors in power reg. 010
MR 18177A-02 Modification to increase input sensitivity to meet industry norm 014
MR 34509A/B/C-OlA Modification to prevent relay closure during instrument turn-on 015
MR 34509A/B/C-01 Modification to prevent relay closure during instrument turn-on 014
MR 34513C-01 Resolder selected components on the PC board to eliminate intermittent operation 014
MR 34514C-01 Resolder selected components on the PC board to eliminate intermittent operation 014
MA 37204A-01B Mod. available to instd fiber optic interface upgrade to Opt. 003,004,013, or 014 008
** 37212B-02 Firmware upgrade to improve performance 002
L
IO 37212B-03 Instructions for ordering firmware part pairs 005
MR 4284lA-01 Bias current source control error (PS fuse on the A4 board may be blown out) 016
MR 447OlA-07 New opto-isolatorsto correct ERROR 27 002
MR 447OlA-08 Modification to correct SELFTEST error 002
MR 447OlA-09 Modification to eliminate noisy readings near zero 002
MR 447OlA-10 Modification to correct 1st reading following range change 002
MR 447OlA-11 Modification to correct inaccurate readings on ACV FUNCTIONS 002
MR 447OlA-12 Modification to increase drive signal to new opto-isolators 002
3
1ST QUARTER 1990 WWW.HPARCHIVE.COM BENCH BRIEFS 11
SN SN Abstract Service Note
Type No.
MA 44702A/B-07 Modification to include compatibility with 4473X Multiplexers
Package
002
r
IO 44702AfB-OS Service manual corrections to resistance specifications 002
MR 44702AfB-09 Modification to make unit meet l00K readingdsec specifications 002
MR 4470W-10 Modification to make unit pass OHMS measurement test 002
MR 44702AfB-11 Modification to make unit pass performance test 002
MR 4470M-12 Modification to make unit pass performance test 002
MR 44709A-01 Modifications to correct readings due to improper FET switching 014
MR 4471OA-02 Modifications to correct readings due to improper FET switching 014
MR 44719A-01 Modifications to correct readings due to improper FET switching 014
MR 4472OA-01 Modifications to correct readings due to improper FET switching 014
MR 54100AID-12A New ROMs eliminate loop failures at power-up & incorporate new firmware 005
MR 54111D-10 Modification to prevent attenuators from sticking 012
IO 54111D-11 Mod. to prevent loss of trace with timebase set at 100-199ns/div. inclusive 015
MR 54112D-04 F/?V mod. to correct PLOT function error when STOP/SINGLE button is pushed 013
IO 54112D-06 Loop 42 failure message may be caused by a Loop 50 failure 006
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