HP 4286A Service Manual

Errata

4286A Service Manual 04286-90111

April 1996

Title & Document Type:

Manual Part Number:

Revision Date:

HP References in this Manual

This manual may contain references to HP or Hewlett-Packard. Please note that HewlettPackard's former test and measurement, semiconductor products and chemical analysis businesses are now part of Agilent Technologies. We have made no changes to this manual copy. The HP XXXX referred to in this document is now the Agilent XXXX. For example, model number HP8648A is now model number Agilent 8648A.

About this Manual

We’ve added this manual to the Agilent website in an effort to help you support your product. This manual provides the best information we could find. It may be incomplete or contain dated information, and the scan quality may not be idea l. If we find a better copy in the future, we will add it to the Agilent website.

Support for Your Product

Agilent no longer sells or supports this product. You will find any other available product information on the Agilent Test & Measurement website:

www.tm.agilent.com

Search for the model number of this product, and the resulting product page will guide you to any available information. Our service centers may be able to perform calibration if no repair parts are needed, but no other support from Agilent is available.

HP 4286A RF LCR Meter

Service Manual

SERIAL NUMBERS

This manual applies directly to instruments with serial number prex JP1KC.

For additional important information about serial numbers, read \INSTRUMENT

COVERED BY THIS MANUAL" in General Information of this service manual.

ABCDE

HP Part No. 04286-90111

Printed in JAPAN April 1999

Notice

The information contained in this document is subject to change without notice.

This document contains proprietary information that is protected by copyright. All rights are

reserved. No part of this document may be photocopied, reproduced, or translated to another

language without the prior written consent of the Hewlett-Packard Company.

Hewlett-Packard Japan, LTD.

Kobe Instrument Division

1-3-2, Murotani, Nishi-Ku, Kobe-Shi

Hyogo 651-2241 Japan



APC7



is a U.S. registered trademark of the Bunker Ramo Corporation.

Manual Printing History

The manual printing date and part number indicate its current edition. The printing date

changes when a new edition is printed. (Minor corrections and updates that are incorporated

at reprint do not cause the date to change.) The manual part number changes when extensive

technical changes are incorporated.

July 1995

April 1999

:::::::: :::::: ::::::::: ::::::::::::: ::::::: ::::::: ::::::: :::::: ::::::::: ::::

::::::: ::::::: ::::::::: ::::::::::::: ::::::: :::::: ::::::: ::::::: :::::::::

Second Edition

First Edition

iii

Safety Summary

The following general safety precautions must be observed during all phases of operation,

service, and repair of this instrument. Failure to comply with these precautions or with specic

WARNINGS

elsewhere in this manual may impair the protection provided by the equipment.

In addition it violates safety standards of design, manufacture, and intended use of the

instrument.

The Hewlett-Packard Company assumes no liability for the customer's failure to comply with

these requirements.

Note

HP 4286A is designed for use in INSTALLATION CATEGORY II according to IEC

61010-1 and POLLUTION DEGREE 1 according to IEC 61010-1 and IEC 60664-1.

HP 4286A is an INDOOR USE product.

Note

LEDs in HP 4286A are Class 1 in accordance with IEC60825-1.

CLASS 1 LED PRODUCT

Ground The Instrument

To avoid electric shock hazard, the instrument chassis and cabinet must be connected to a

safety earth ground by the supplied power cable with earth blade

DO NOT Operate In An Explosive Atmosphere

Do not operate the instrument in the presence of ammable gasses or fumes

. Operation of any

electrical instrument in such an environment constitutes a denite safety hazard.

Keep Away From Live Circuits

Operating personnel must not remove instrument covers. Component replacement and internal

adjustments must be made by qualied maintenance personnel. Do not replace components

with the power cable connected. Under certain conditions, dangerous voltages may exist even

with the power cable removed. To avoid injuries, always disconnect power and discharge

circuits before touching them.

DO NOT Service Or Adjust Alone

Do not attempt internal service or adjustment unless another person, capable of rendering rst

aid and resuscitation, is present.

DO NOT Substitute Parts Or Modify Instrument

Because of the danger of introducing additional hazards, do not install substitute parts

or perform unauthorized modications to the instrument. Return the instrument to a

Hewlett-Packard Sales and Service Oce for service and repair to ensure that safety features

are maintained.

Dangerous Procedure Warnings

Warnings

, such as the example below, precede potentially dangerous procedures throughout

this manual. Instructions contained in the warnings must be followed.

Warning

Dangerous voltages, capable of causing death, are present in this

instrument. Use extreme caution when handling, testing, and adjusting

this instrument.

Typeface Conventions

Bold

Italics

Computer

HARDKEYS

NNNNNNNNNNNNNNNNNNNNNNNNNN

SOFTKEYS

Boldface type is used when a term is dened. For example:

icons

are

symbols.

Italic type is used for emphasis and for titles of manuals and other

publications.

Italic type is also used for keyboard entries when a name or a variable

must be typed in place of the words in italics.For example:

lename

type the name of a le such as

means to type the word

file1

copy

, to type a space, and then to

copy

Computer font is used for on-screen prompts and messages.

Labeled keys on the instrument front panel are enclosed in45.

NNNNN

Softkeys located to the right of the CRT are enclosed in

Certication

Hewlett-Packard Company certies that this product met its published specications at the

time of shipment from the factory. Hewlett-Packard further certies that its calibration

measurements are traceable to the United States National Institute of Standards and

Technology, to the extent allowed by the Institution's calibration facility, or to the calibration

facilities of other International Standards Organization members.

Warranty

This Hewlett-Packard instrument product is warranted against defects in material and

workmanship for a period of one year from the date of shipment, except that in the case of

certain components listed in

General Information

of this manual, the warranty shall be for the

specied period. During the warranty period, Hewlett-Packard Company will, at its option,

either repair or replace products that prove to be defective.

For warranty service or repair, this product must be returned to a service facility designated by

HP. Buyer shall prepay shipping charges to HP and HP shall pay shipping charges to return the

product to Buyer. However, Buyer shall pay all shipping charges, duties, and taxes for products

returned to HP from another country.

HP warrants that its software and rmware designated by HP for use with an instrument will

execute its programming instruction when property installed on that instrument. HP does not

warrant that the operation of the instrument, or software

, or rmware will be uninterrupted or

error free.

Limitation Of Warranty

The foregoing warranty shall not apply to defects resulting from improper or inadequate

maintenance by Buyer, Buyer-supplied software or interfacing, unauthorized modication or

misuse, operation outside the environmental specications for the product, or improper site

preparation or maintenance.

No other warranty is expressed or implied. HP specically disclaims the implied warranties

of merchantability and tness for a particular purpose.

vii

Exclusive Remedies

The remedies provided herein are buyer's sole and exclusive remedies. HP shall not be liable

for any direct, indirect, special, incidental, or consequential damages, whether based on

contract, tort, or any other legal theory.

Assistance

Product maintenance agreements and other customer assistance agreements are available for

Hewlett-Packard products.

For any assistance, contact your nearest Hewlett-Packard Sales and Service Oce.Addresses

are provided at the back of this manual.

viii

Safety Symbols

General denitions of safety symbols used on equipment or in manuals are listed below.

Instruction manual symbol: the product is marked with this symbol when it is

necessary for the user to refer to the instruction manual.

Alternating current.

Direct current.

On (Supply).

O (Supply).

This

Warning

condition or the like, which, if not correctly performed or adhered to, could

result in injury or death to personnel.

This

Caution

condition or the like, which, if not correctly performed or adhered to, could

result in damage to or destruction of part or all of the product.

sign denotes a hazard. It calls attention to a procedure, practice,

Note

practice, condition or the like, which is essential to highlight.

denotes important information. It calls attention to a procedure

Documentation Map

The following manuals are available for the HP 4286A:

Operating Manual Set (HP Part Number 04286-90030)

The

Function Reference

describes all functions accessed from the front panel keys and

softkeys. It also provides the HP 4286A features, specications, information on options and

accessories available.

Users Guide (HP Part Number 04286-90031)

The

Users Guide

walks you through system setup and initial power-on, shows how to

make basic measurements, explains commonly used features, and typical application

measurement examples. After you receive your HP 4286A, begin with this manual.

Programming Manual (HP Part Number 04286-90027)

The

Programming Manual

provides how to write BASIC program to control the HP 4286A

using HP-IB, and a summary of all available HP-IB commands.

HP Instrument BASIC Users Handbook (Option 1C2 only), (HP Part Number

E2083-90000)

The

HP Instrument BASIC Users Handbook

introduces you to the HP Instrument BASIC

programming language, provides some helpful hints on getting the most use from it, and

provides a general programming reference. It is divided into three books,

BASIC Programming Techniques,HP Instrument BASIC Interface Techniques

Instrument BASIC Language Reference

HP Instrument

, and

HP Instrument BASIC Users Handbook Supplement (Option 1C2 Only), (HP P

04286-90005)

The

HP Instrument BASIC Users Handbook Supplement

describes how HP Instrument

BASIC works with the HP 4286A.

Service Manual (Option 0BW only), (HP Part Number 04286-90111)

The

Service Manual

explains how to do performance tests, and to adjust, troubleshoot, and

repair the instrument.

art Number

Contents

1. General Information

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

ORGANIZATION OF SERVICE MANUAL...... ...... ...... .. 1-1

INSTRUMENT COVERED BY MANUAL .................... 1-3

TABLE OF SERVICE TEST EQUIPMENT . . . . . . . . . . . . . . . . . . . . 1-4

2. Performance Tests

INTRODUCTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-1

GENERAL INFORMATION .......................... 2-1

Warm Up Time .............................. 2-1

Ambient Conditions ............................

Calibration Cycle ...... ...... ........ ...... ...

Performance Test Record . . . . . . . . . . . . . . . . . . . . . . . . . .

Recommended Test Equipment . . . . . . . . . . . . . . . . . . . . . . .

FREQUENCY ACCURACY TEST . . . . . . . . . . . . . . . . . . . . . . . .

Description ................................

Test Equipment ...... ...... ........ ...... ....

Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

OSC LEVEL ACCURACY TEST ........................

Description ................................

Test Equipment ...... ...... ........ ...... ....

Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

MEASUREMENT ACCURACY TEST . . . . . . . . . . . . . . . . . . . . . .

Description ................................

Test Equipment ...... ...... ........ ...... ....

Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Calibrating the HP 4286A ...... ...... ...... ...... 2-9

Turning on the DC Resistance Measurement Function ........... 2-9

Open Measurement Test ......................... 2-9

Short Measurement Test ......................... 2-10

50  Measurement Test............ ...... ...... .. 2-10

10 cm Airline with Open Test.......................

10 cm Airline with Short Test...... ...... ........ ...

PERFORMANCE TEST RECORD .......................

Frequency Accuracy Test.. ...... ........ ..... .....

Osc Level Accuracy Test ..........................

1mTest Head (Standard / Option 031) ..................

3mTest Head (Option 022/032) . . . . . . . . . . . . . . . . . . . . . .

Measurement Accuracy Test ...... ...... ........ ....

(1) Impedance Measurement Accuracy Test ................ 2-14

(2) DC Resistance Measurement Accuracy Test...... ...... ... 2-22

2-1

2-2

2-3

2-5

2-7

2-10

2-12

2-13

2-14

Contents-1

3. Adjustments and Correction Constants

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

SAFETY CONSIDERATIONS ......................... 3-1

REQUIRED EQUIPMENT . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-2

WARM-UP FOR ADJUSTMENTS AND CORRECTION CONSTANTS . . . . . . . . 3-2

INSTRUMENT COVER REMOVAL .. ...... ..... ...... .... 3-2

ORDER OF ADJUSTMENTS . . . . . . . . . . . . . . . . . . . . . . . . . . 3-2

ADJUSTMENT PROGRAM .......................... 3-3

Keyboard and Mouse Operation . . . . . . . . . . . . . . . . . . . . . . . 3-3

Controller Requirement .... ...... ...... ...... .... 3-4

Preparation for Using the Adjustment Program ............... 3-5

40 MHz REFERENCE OSCILLATOR FREQUENCY ADJUSTMENT ........ 3-6

Required Equipment . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-6

Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-6

520 MHz LEVEL ADJUSTMENT ...... ...... ...... ..... 3-8

Required Equipment . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-8

Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-8

COMB GENERATOR ADJUSTMENT . . . . . . . . . . . . . . . . . . . . . . 3-10

Required Equipment . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-10

Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-10

SECOND LOCAL PLL LOCK ADJUSTMENT .... ...... ...... ..

Required Equipment . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

SOURCE VCXO ADJUSTMENT ........................

Required Equipment . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

THIRD LOCAL VCXO ADJUSTMENT ...... ...... ..... ....

Required Equipment . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

SOURCE MIXER LOCAL LEAKAGE ADJUSTMENT . . . . . . . . . . . . . . .

Required Equipment . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

OSC LEVEL CORRECTION CONSTANTS . . . . . . . . . . . . . . . . . . . .

Required Equipment . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

HOLD STEP ADJUSTMENT . . . . . . . . . . . . . . . . . . . . . . . . . . 3-21

Required Equipment . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-21

Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-21

BAND PASS FILTER ADJUSTMENT . . . . . . . . . . . . . . . . . . . . . . 3-22

Required Equipment . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-22

Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Display Adjustment .......... ...... ...... ...... .

Test Equipment ..............................

Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3-13

3-15

3-16

3-17

3-19

3-22

3-24

4. Overall Troubleshooting

TROUBLESHOOTING SUMMARY .......................

INSPECTING THE POWER ON SEQUENCE ..................

Check the Fan.. ...... ...... ...... ........ ... 4-4

Check the Power On State ........ ........ ...... ... 4-4

Check Error Message . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Troubleshooting When Power On Self-Test Failed .............

A2 POST REGULATOR Test Fail......................

VERIFYING FUNCTIONAL GROUPS . . . . . . . . . . . . . . . . . . . . . .

Source Verication . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Contents-2

4-2

4-4

4-5

4-6

Test Equipment ............................. 4-6

Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-6

Receiver Verication . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-9

Test Equipment ............................. 4-9

Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-9

Test Head Verication ........................... 4-10

Test Equipment ............................. 4-10

Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-10

TROUBLESHOOTING HP-IB SYSTEM ..................... 4-11

Check the External Controller .. ...... ...... ...... ... 4-11

5. Power Supply Troubleshooting

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

POWER SUPPLY TROUBLESHOOTING SUMMARY . . . . . . . . . . . . . . . 5-3

Start Here . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-3

Find Out Why the Fan is Not Rotating . . . . . . . . . . . . . . . . . . . . 5-3

Find Out Why The A40 SHUTDWON LED is On ............... 5-3

Find Out Why the +5 VD LED is Not On Steadily .. ........ .... 5-3

Troubleshoot the Fan and the A40 Pre-Regulator .... ........ .. 5-4

Troubleshoot the A2 Post-Regulator . . . . . . . . . . . . . . . . . . . . . 5-4

Troubleshoot the A52 DC-DC Converter . . . . . . . . . . . . . . . . . . .

START HERE ................................

1. Check Error Messages . . . . . . . . . . . . . . . . . . . . . . . . . .

2. Check the Fan is Rotating .. ...... ...... ...... ....

3. Check the A40 SHUTDOWN LED . . . . . . . . . . . . . . . . . . . . .

A40 Shutdown LED ...........................

4. Check the A1 +5 VD LED . . . . . . . . . . . . . . . . . . . . . . . .

Measure the A1 +5 VD Voltage . . . . . . . . . . . . . . . . . . . . . .

5. Check the A2 Eight LEDs ........................

6. Run the Internal Test 4: A2 POST REGULATOR..............

FIND OUT WHY THE FAN IS NOT ROTATING ........ ...... ...

1. Check the Line Voltage, Selector Switch Setting, and Fuse . . . . . . . . .

2. Check the A40 SHUTDOWN LED . . . . . . . . . . . . . . . . . . . . .

FIND OUT WHY THE A40 SHUTDOWN LED IS ON . . . . . . . . . . . . . . .

1. Disconnect the Cable from the A40J1 ..................

2. Disconnect the Cable from the A51J2 .................. 5-11

3. Disconnect the Cable from the A1J10 .................. 5-11

4. Remove Assemblies . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-11

FIND OUT WHY THE A1 +5 VD LED IS NOT ON STEADILY .......... 5-12

1. Check the A40 Pre-Regulator ........ ...... ...... .. 5-12

2. Disconnect Cables on the A1 CPU ....................

3. Remove Assemblies . . . . . . . . . . . . . . . . . . . . . . . . . . .

TROUBLESHOOT THE FAN AND THE A40 PRE-REGULATOR .........

1. Troubleshoot the Fan ...... ...... ..... ...... ...

2. Troubleshoot the A40 Pre-Regulator ...................

TROUBLESHOOT THE A2 POST-REGULATOR ...... ...... .....

1. Check the A40 Pre-Regulator ........ ...... ...... ..

2. Remove Assemblies . . . . . . . . . . . . . . . . . . . . . . . . . . .

3. Measure the A2 Post Regulator Output Voltages . . . . . . . . . . . . . . 5-19

TROUBLESHOOT THE A52 DC-DC CONVERTER . . . . . . . . . . . . . . . . 5-21

5-4

5-5

5-6

5-7

5-8

5-10

5-11

5-13

5-14

5-15

5-16

5-18

Contents-3

6. Digital Control Troubleshooting

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

DIGITAL CONTROL TROUBLESHOOTING SUMMARY . . . . . . . . . . . . . . 6-3

Start Here . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-3

Troubleshoot the A51 GSP ......................... 6-3

START HERE ................................ 6-4

1. Check the Power On Sequence . . . . . . . . . . . . . . . . . . . . . . 6-4

Check the Eight A1 LEDs ........................ 6-4

2. Check Error Messages . . . . . . . . . . . . . . . . . . . . . . . . . . 6-5

Identify the First Failed Test ....................... 6-6

3. Check the A1 DRAM and Flash Memory ................. 6-6

4. Check the A1 Volatile Memory . . . . . . . . . . . . . . . . . . . . . . 6-7

5. Check the A30 Front Keyboard ........ ...... ...... . 6-8

6. Check the A33 Handler Interface / Backup SRAM . . . . . . . . . . . . . 6-8

Check the Backup SRAM . . . . . . . . . . . . . . . . . . . . . . . . . 6-8

Check the Handler Interface Function .................. 6-8

7. Check the Flexible Disk Drive ...................... 6-9

8. Check the A32 I-BASIC Interface and the HP-HIL Keyboard (Option 1C2) . . 6-9

TROUBLESHOOT THE A51 GSP ....................... 6-10

1. Run Internal Test 3: A51 GSP .... ...... ...... ..... . 6-10

2. Check Two LEDs on A51 GSP ......................

7. Source Group Troubleshooting

INTRODUCTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

SOURCE GROUP TROUBLESHOOTING SUMMARY . . . . . . . . . . . . . . .

Start Here . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Check A5 Synthesizer Outputs .......................

Check A4A1 1st LO Outputs ........................

Check an A3A1 Source Vernier Output ...... ...... ...... .

Check A3A2 2nd LO Outputs . . . . . . . . . . . . . . . . . . . . . . . .

Check A3A3 Source Output ........................

Check A7 Output Attenuator Control Signals ................

START HERE ................................

CHECK A5 SYNTHESIZER OUTPUTS .....................

1. Check the INT REF Signal . . . . . . . . . . . . . . . . . . . . . . . .

2. Check the FRAC N OSC Signal . . . . . . . . . . . . . . . . . . . . . . 7-7

3. Check the 520 MHz Signal . . . . . . . . . . . . . . . . . . . . . . . . 7-9

4. Check the EXT REF Operation . . . . . . . . . . . . . . . . . . . . . . 7-11

CHECK A4A1 1ST LO OUTPUTS .... ...... ...... ...... . 7-13

1. Check the 1st LO OSC Signal at A4A1J3 ................. 7-13

2. Check the 1st LO OSC Signal at A4A1J4

.................

CHECK A3A1 SOURCE VERNIER OUTPUT .... ...... ...... ..

1. Check the 21.42 MHz Signal . . . . . . . . . . . . . . . . . . . . . . .

CHECK A3A2 2ND LO OUTPUTS . . . . . . . . . . . . . . . . . . . . . . .

1. Check the 2nd Local Oscillator Signal ..................

2. Check the 2.05858 GHz Signal . . . . . . . . . . . . . . . . . . . . . .

CHECK A3A3 SOURCE OUTPUT .......................

1. Check the A3A3 RF Signal . . . . . . . . . . . . . . . . . . . . . . . .

CHECK A7 OUTPUT ATTENUATOR CONTROL SIGNALS ............ 7-25

1. Check A7 Control Signals .. ...... ...... ..... ..... 7-25

6-10

7-1

7-3

7-4

7-5

7-15

7-17

7-19

7-20

7-23

Contents-4

8. Receiver Group Troubleshooting

INTRODUCTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-1

RECEIVER GROUP TROUBLESHOOTING SUMMARY . . . . . . . . . . . . . . 8-3

START HERE ................................ 8-4

Test Equipment ...... ...... ........ ...... .... 8-4

Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-4

FRONT ISOL'N Test Failure Troubleshooting . . . . . . . . . . . . . . . . 8-5

9. Test Head Troubleshooting

INTRODUCTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9-1

TEST HEAD TROUBLESHOOTING .. ...... ...... ...... .. 9-3

Performing the Test Head Diagnostic Test .... ...... ...... .. 9-3

When the Signal Voltage Test Fails ...... ...... ...... ... 9-5

When the DC Voltage Test Fails . . . . . . . . . . . . . . . . . . . . . . . 9-6

Check the A43 DC Voltage Source .................... 9-6

Check the DC Voltage Measurement Value . . . . . . . . . . . . . . . . . 9-6

10. Service Key Menus

INTRODUCTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-1

SERVICE MENU . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-3

NNNNNNNNNNNNNNNNN

TESTS

NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN

SERVICE MODES(:DIAG:SERV:MODE {ON|1}

NNNNNNNNNNNNNNNNNNNNNNN

READ ID

NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN

FIRMWARE REVISION(:DIAG:FREV?

TESTS MENU ................................

NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN

EXECUTE TEST(:DIAG:TEST:EXEC

NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN

INTERNAL TESTS(:DIAG:TEST 0

NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN

EXTERNAL TESTS(:DIAG:TEST 16

NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN

ADJUSTMENT TESTS(:DIAG:TEST 26

NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN

DISPLAY TESTS(:DIAG:TEST 32

..................................

) ................

.................................

) . ........ ..... ......

).....................

) .... ...... ..... ......

).....................

) ....................

) .... ...... ..... ......

Test Status ................................

Diagnostic Tests ..............................

Test Descriptions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN

INTERNAL TESTS

............................ 10-8

0: ALL INT ............................... 10-8

1: A1 CPU ............................... 10-8

2: A1 VOLATILE MEMORY . . . . . . . . . . . . . . . . . . . . . . . . 10-8

3: A51 GSP ...............................

4: A2 POST REGULATOR ........................

5: A6 A/D CONVERTER .........................

6: A5 REFERENCE OSC .........................

7: A5 FRACTIONAL N OSC . . . . . . . . . . . . . . . . . . . . . . . .

8: A4A1 1ST LO OSC .......................... 10-9

9: A3A2 2ND LO OSC ..........................

10: A3A1 DIVIDER ...........................

11: A6 3RD LO OSC .. ...... ...... ...... ...... . 10-10

12: A3A1 SOURCE OSC .... ...... ..... ...... .... 10-10

13: A6 SEQUENCER . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-10

14: SOURCE LEVEL . . . . . . . . . . . . . . . . . . . . . . . . . . .

15: A33 MEMORY DISK .........................

NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN

EXTERNAL TESTS

............................

16: FRONT PANEL DIAG. ........................

10-3

10-4

10-5

10-6

10-7

10-8

10-9

10-10

Contents-5

17: DSK DR FAULT ISOL'N . . . . . . . . . . . . . . . . . . . . . . . . 10-10

18: SOURCE FLATTNESS .. ...... ...... ...... .... 10-11

19: OUTPUT ATTENUATOR .... ...... ...... ...... . 10-11

20: RECEIVER GAIN .......................... 10-11

21: A6 GAIN .... ...... ...... ...... ...... .. 10-11

22: A6 V/I NORMALIZER ........................ 10-11

23: FRONT ISOL'N . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-11

24: TEST HEAD . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-11

25: A33 HANDLER INTERFACE ..................... 10-12

NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN

ADJUSTMENT TESTS

...... ...... ........ ...... . 10-12

26: HOLD STEP ADJ .......................... 10-12

27: BPF ADJ .............................. 10-12

28: 3RD VCXO LEVEL ADJ ...... ...... ...... ..... 10-12

29: 2ND LO PLL LOCK ADJ ....................... 10-12

30: SOURCE VCXO LEVEL ADJ ........ ...... ..... .. 10-12

31: SOURCE MIXER LEAK ADJ ..................... 10-13

NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN

DISPLAY TESTS

............................ 10-13

32: TEST PATTERN 1 .......................... 10-13

33: TEST PATTERN 2 .......................... 10-13

34: TEST PATTERN 3 .......................... 10-13

35: TEST PATTERN 4 ..........................

36: TEST PATTERN 5 ..........................

SERVICE MODES MENU . . . . . . . . . . . . . . . . . . . . . . . . . . .

NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN

BUS MEAS [OFF]

NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN

CORRECTION CONSTANTS

NNNNNNNNNNNNNNNNN

SYNTH

NNNNNNNNNNN

OSC

NNNNNNNNNNN

TRD

NNNNNNNN

..................................

...... ...... ........ ...... ...... ...

....................................

...... ...... ........ ...... ...

..........................

Service Modes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

BUS MEASUREMENT MENU . . . . . . . . . . . . . . . . . . . . . . . . .

NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN

BUS MEAS on OFF(:DIAG:SERV:BUS:STAT {ON|OFF}

NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN

DC BUS [OFF](:DIAG:SERV:BUS:DC<numeric>) .............

NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN

FREQ BUS [OFF](:DIAG:SERV:BUS:FREQ<numeric>) ........... 10-16

NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN

AZ SWITCH on OFF(:DIAG:SERV:BUS:AZER {OFF|ON|0|1}

NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN

)............

)..... .... 10-17

WAIT COUNT(:DIAG:SERV:BUS:WAIT<numeric>) ............. 10-17

Bus Measurement .... ...... ...... ...... ...... . 10-17

Bus Measurement Procedure .. ...... ...... ...... ....

Bus Measurement Values . . . . . . . . . . . . . . . . . . . . . . . . . .

DC Bus Node Descriptions .........................

0: OFF .................................

1: +5 V (AUX) (2.025 U) . . . . . . . . . . . . . . . . . . . . . . . . .

2:015 V (01.92 U) ........ ...... ...... ...... .

3:012.6 V (02.124 U) . . . . . . . . . . . . . . . . . . . . . . . . . .

4:05V(02.025 U) ........ ...... ...... ...... .

5: +5 V (2.025 U) ............................ 10-18

6: +5.3 V (2.1465 U) . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-18

7: +8.5 V (1.8955 U) . . . . . . . . . . . . . . . . . . . . . . . . . . .

8: +15 V (AUX) (1.92 U) . . . . . . . . . . . . . . . . . . . . . . . . .

9: +15 V (1.92 U) ............................

10: +22 V (2.002 U) . . . . . . . . . . . . . . . . . . . . . . . . . . .

10-13

10-14

10-15

10-16

10-17

10-18

10-19

Contents-6

11: FAN POWER . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-19

12: +65 V (2.0605 U) .......................... 10-19

13: SRC VTUNE (Source Oscillator VCO Tuning Voltage) .......... 10-19

14: 2ND LO VTUNE (Second Local Oscillator VCO Tuning Voltage) ..... 10-19

15: DET OUT (Detector Output) ..................... 10-19

16: SRC LO LEVEL ........................... 10-19

17: DAC OUT (Level DAC Output Voltage) . . . . . . . . . . . . . . . . . 10-19

18: 1ST LO VTUNE (First Local Oscillator VCO Turning Voltage) ...... 10-19

19: (Not Available) . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-20

20: FN VTUNE (Fractional N Oscillator VCO Turning Voltage) ....... 10-20

21: FN INTEG OUT (Fractional N Oscillator Integrator Output Voltage) ... 10-20

22: REF VTUNE (Reference Oscillator VCO Tuning Voltage) ........ 10-20

23: 3RD LO VTUNE (Third Local Oscillator VCO Tuning Voltage) ...... 10-20

24: 3RD LO LEVEL ........................... 10-20

25: AD VREF (A/D Converter Voltage Reference) .... ........ . 10-20

26: RDC VOLTAGE............................ 10-20

27: (Not Available) . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-20

28: (Not Available) . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-20

29: GND .... ...... ...... ..... ...... ..... 10-20

Frequency Bus Node Descriptions . . . . . . . . . . . . . . . . . . . . . . 10-20

0: OFF .................................

1: SOURCE OSC (Source Oscillator) . . . . . . . . . . . . . . . . . . . .

2: DIVIDER OUT (Divider Output) ....................

3: (Not Available) ............................

4: FN OSC (Fractional N Oscillator) . . . . . . . . . . . . . . . . . . . .

5: REF OSC (Reference Oscillator) .... ...... ...... ....

6: 3RD LO OSC (Third Local Oscillator) ..................

7: SAMPLE HOLD . . . . . . . . . . . . . . . . . . . . . . . . . . . .

CORRECTION CONSTANTS MENU .. ........ ...... ......

NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN

OSC LVL CC [ ](:DIAG:SERV:CCON:OLEV {NORM|FRON|OFF}

)........

Correction Constants . . . . . . . . . . . . . . . . . . . . . . . . . . . .

SYNTHESIZER CONTROL MENU .......................

NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN

FREQUENCY OFFSET

OSC CONTROL MENU ............................

NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN

OSC AUTO man(:DIAG:SERV:SOUR:MODE {AUTO|MAN}

NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN

............................

)............

OUTPUT ATT [ ](:DIAG:SERV:SOUR:ATT

{AUTO|DB0|DB10|DB20|DB30|DB40|DB50|DB60}

NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN

OSC DAC AUTO man(:DIAG:SERV:SOUR:LEV:DAC:MODE {AUTO|MAN}

NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN

OSC DAC VALUE(:DIAG:SERV:SOUR:LEV:DAC:VAL<numeric>) .. ..... 10-26

NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN

OSC OUT ON off(:DIAG:SERV:SOUR:STAT {OFF|ON|0|1}

TRANSDUCER CONTROL MENU .......................

NNNNNNNNNNNNNNNNNNNNNNNNNN

MEAS [ ](:DIAG:SERV:TRAN:SENS:FUNC {IMP|VOLT|CURR|VIR}

IF CONTROL MENU .. ...... ...... ..... ...... ....

NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN

IF GAIN AUTO man(:DIAG:SERV:IF:GAIN:MODE {AUTO|MAN}

NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN

GAIN XV [ ](:DIAG:SERV:IF:GAIN:X:XV {DB0|DB6|DB12}

NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN

GAIN XI [ ](:DIAG:SERV:IF:GAIN:X:XI {DB0|DB6|DB12}

NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN

GAIN Y [ ](:DIAG:SERV:IF:GAIN:Y {DB0|DB6|DB12|DB18}

NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN

GAIN Z [ ](:DIAG:SERV:IF:GAIN:Z {DB0|DB2|DB4|DB18}

NNNNNNNNNNNNNNNNN

IF BW

BOOTLOADER MENU ............................

NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN

SYSTEM UPDATE]

..................................

.............................

)............. 10-25

)..... 10-26

) .........

)...... 10-27

)........ 10-29

) .... .... 10-29

)........ 10-29

) .. ......

10-20

10-21

10-22

10-23

10-24

10-25

10-26

10-27

10-28

10-29

10-30

10-31

Contents-7

NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN

SYSTEM BACKUP

NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN

PREVIEW DISK

NNNNNNNNNNNNNNNNNNNN

REBOOT

.................................. 10-32

.............................. 10-31

.............................. 10-32

11. Theory of Operation

OVERALL OPERATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11-1

FUNCTIONAL GROUPS ........................... 11-2

POWER SUPPLY OPERATION . . . . . . . . . . . . . . . . . . . . . . . . . 11-3

A40 Preregulator ............................. 11-5

Line Power Module .... ...... ...... ........ ... 11-5

Switching Regulator 1 .......................... 11-5

Switching Regulator 2 .......................... 11-5

Regulated +5V Digital Supply (+5 VD) ...... ...... ...... 11-5

A40 Shutdown LED ........................... 11-5

A2 Post-Regulator .. ...... ...... ...... ...... ... 11-6

Shutdown Circuit ............................ 11-6

Eight Status LEDs . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11-7

A7 Output Attenuator Drive Circuit . . . . . . . . . . . . . . . . . . . . 11-8

A52 DC-DC Converter ........................... 11-8

DIGITAL CONTROL OPERATION .......................

A1CPU...... ...... ...... ..... ...... .....

A30 Front-Panel Keyboard . . . . . . . . . . . . . . . . . . . . . . . . .

A31 Interface Connector . . . . . . . . . . . . . . . . . . . . . . . . . .

A32 I-BASIC Interface (Only for Option 1C2) . . . . . . . . . . . . . . . . .

A33 Handler Interface / Backup SRAM ...................

A51 GSP .................................

CRT Display . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Flexible Disk Drive ............................

SOURCE THEORY ..............................

A5 Synthesizer ...... ...... ........ ..... .....

REF OSC ................................

FRAC N OSC ..............................

STEP OSC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Multiplier (X 13) . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

A4A1 1st LO ............................... 11-16

1st Local OSC Circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . 11-16

Single-Loop Operation .......... ...... ...... ... 11-16

A3A1 Source Vernier . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11-16

Divider ................................. 11-17

Source OSC .......... ...... ...... ...... ...

Level Vernier ..............................

A3A2 2nd LO ........ ...... ...... ..... ......

2nd LO .................................

Source First Mixer . . . . . . . . . . . . . . . . . . . . . . . . . . . .

A3A3 Source ...............................

A7 Output Attenuator ...........................

RECEIVER THEORY . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

A4A2 Receiver RF . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11-21

A6 Receiver IF .............................. 11-21

Third Local Oscillator ..........................

Third Converter . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Sample/Hold and A/D Converter .....................

Gains X, Y, and Z ............................

TEST HEAD THEORY ............................

11-9

11-11

11-12

11-13

11-15

11-16

11-17

11-18

11-19

11-21

11-22

11-23

Contents-8

Transducer ................................ 11-25

V/I Multiplexer .............................. 11-25

A43 Head Control ............................. 11-25

DC Resistance Measurement ....................... 11-25

12. Replaceable Parts

INTRODUCTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12-1

ORDERING INFORMATION . . . . . . . . . . . . . . . . . . . . . . . . . . 12-1

Direct Mail Order System . . . . . . . . . . . . . . . . . . . . . . . . . . 12-1

EXCHANGE ASSEMBLIES .... ...... ...... ...... .... 12-2

REPLACEABLE PARTS LIST .......... ...... ........ . 12-2

Top View Assemblies . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12-4

Bottom View Assemblies . . . . . . . . . . . . . . . . . . . . . . . . . . 12-12

Front Assembly Parts ........ ...... ...... ....... 12-19

Rear Assembly Parts . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12-22

CRT Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12-26

Test Head Parts ...... ...... ........ ...... .... 12-28

Miscellaneous Parts ............................ 12-30

13. Replacement Procedures

INTRODUCTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

TOP COVER REMOVAL............................

Tools Required . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

BOTTOM COVER REMOVAL .... ........ ...... ..... ..

Tools Required . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

SIDE COVER REMOVAL .. ........ ...... ...... .....

Tools Required . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

FRONT PANEL REMOVAL .. ...... ........ ..... .....

Tools Required . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

REAR PANEL REMOVAL...........................

Tools Required . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13-3

A1 CPU REPLACEMENT . . . . . . . . . . . . . . . . . . . . . . . . . . . 13-4

Tools Required . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13-4

Removal Procedure ............................ 13-4

Replacement Procedure .... ...... ...... ...... .... 13-5

A2 POST REGULATOR REPLACEMENT . . . . . . . . . . . . . . . . . . . .

Tools Required . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Removal Procedure ............................

Replacement Procedure .... ...... ...... ...... ....

A3A1 Source Vernier, A3A2 SECOND LO, AND A3A3 SOURCE REPLACEMENT . 13-6

Tools Required . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Removal Procedure ............................

Replacement Procedure .... ...... ...... ...... ....

A4 FIRST LO/RECEIVER RF REPLACEMENT .. ........ ...... . 13-8

Tools Required . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13-8

Removal Procedure ............................

Replacement Procedure .... ...... ...... ...... ....

A5 SYNTHESIZER REPLACEMENT . . . . . . . . . . . . . . . . . . . . . .

Tools Required . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Removal Procedure ............................

13-1

13-2

13-3

13-5

13-6

13-7

13-8

13-9

Contents-9

Replacement Procedure .... ...... ...... ..... ..... 13-9

A6 RECEIVER IF REPLACEMENT ...................... 13-9

Tools Required . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13-9

Removal Procedure ............................ 13-9

Replacement Procedure .... ...... ...... ..... ..... 13-9

A7 OUTPUT ATT AND A8 3 dB ATT REPLACEMENT ............. 13-10

Tools Required . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13-10

Removal Procedure ............................ 13-10

Replacement Procedure .... ...... ...... ..... ..... 13-10

A30 KEYBOARD REPLACEMENT . . . . . . . . . . . . . . . . . . . . . . . 13-10

Tools Required . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13-10

Removal Procedure ............................ 13-10

Replacement Procedure .... ...... ...... ..... ..... 13-10

A33 HANDLER INTERFACE/BACKUP SRAM REPLACEMENT . . . . . . . . . . 13-11

Tools Required . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13-11

Removal Procedure ............................ 13-11

Replacement Procedure .... ...... ...... ..... ..... 13-11

A40 PREREGULATOR REPLACEMENT .................... 13-11

Tools Required . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13-11

Removal Procedure ............................ 13-11

Replacement Procedure .... ...... ...... ..... .....

A43 HEAD CONTROL REPLACEMENT .... ...... ...... ....

Tools Required . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Removal Procedure ............................

Replacement Procedure .... ...... ...... ..... .....

1m/3m CABLE ASSEMBLY REPLACEMENT . . . . . . . . . . . . . . . . . .

Tools Required . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Removal Procedure ............................

Replacement Procedure .... ...... ...... ..... .....

A51 GSP REPLACEMENT ..........................

Tools Required . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Removal Procedure ............................

Replacement Procedure .... ...... ...... ..... .....

A52 DC-DC CONVERTER REPLACEMENT . . . . . . . . . . . . . . . . . . .

Tools Required . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

13-11

13-12

13-13

Removal Procedure ............................ 13-13

Replacement Procedure .... ...... ...... ..... ..... 13-13

CRT REPLACEMENT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13-14

Tools Required . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13-14

Removal Procedure ............................ 13-14

Replacement Procedure .... ...... ...... ..... .....

FLEXIBLE DISK DRIVE REPLACEMENT .... ...... ...... ...

Tools Required . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Removal Procedure ............................

Replacement Procedure .... ...... ...... ..... .....

13-14

Contents-10

14. Post Repair Procedures

INTRODUCTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14-1

POST REPAIR PROCEDURES . . . . . . . . . . . . . . . . . . . . . . . . . 14-1

FIRMWARE INSTALLATION ......................... 14-3

Ordering the Firmware Diskette ...................... 14-3

Installing the Firmware .. ...... ...... ...... ..... . 14-3

A. Manual Changes

Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A-1

Manual Changes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A-1

Serial Number . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A-2

B. Power Requirement

Power Requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B-1

Changing the Line Voltage Setting ..................... B-1

Replacing the Fuse . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B-2

Power Cable Requirement ...... ........ ..... ...... B-4

Messages

Error Messages in Alphabetical Order . . . . . . . . . . . . . . . . . . . . .Messages-1

Error Messages in Numerical Order .. ...... ...... ...... ..

Messages-6

Contents-11

Figures

1-1. Serial Number Plate ........ ...... ...... ..... ... 1-3

2-1. Frequency Accuracy Test Setup . . . . . . . . . . . . . . . . . . . . . . . 2-3

2-2. OSC Level Accuracy Test Setup . . . . . . . . . . . . . . . . . . . . . . . 2-5

2-3. Impedance Measurement Accuracy Test Setup . . . . . . . . . . . . . . . . 2-7

2-4. Sweep List for Measurement Accuracy Test ................. 2-8

2-5. 10 cm Airline with Open Measurement Test Setup .............. 2-11

2-6. 10 cm Airline with Short Measurement Test Setup . . . . . . . . . . . . . . 2-12

3-1. 40 MHz Reference Oscillator Frequency Adjustment Setup .......... 3-6

3-2. 40 MHz Reference Oscillator Frequency Adjustment Location . . . . . . . . . 3-7

3-3. 520 MHz Level Adjustment Location .................... 3-8

3-4. 520 MHz Level Adjustment Setup . . . . . . . . . . . . . . . . . . . . . . 3-9

3-5. Comb Generator Adjustment Setup ........ ...... ...... .

3-6. Comb Generator Adjustment Location . . . . . . . . . . . . . . . . . . . .

3-7. Comb Generator Output ..........................

3-8. Second Local PLL Adjustment Location . . . . . . . . . . . . . . . . . . .

3-9. Second Local PLL Adjustment Setup ....................

3-10. Source VCXO Adjustment Location ...... ...... ...... ...

3-11. Third Local VCXO Adjustment Location . . . . . . . . . . . . . . . . . . .

3-12. Source Mixer Local Leakage Adjustment Setup .... ...... .....

3-13. Source Mixer Leakage Adjustment Location . . . . . . . . . . . . . . . . .

3-14. OSC Level Correction Constants Setup (1) . . . . . . . . . . . . . . . . . .

3-15. OSC Level Correction Constants Setup (2) . . . . . . . . . . . . . . . . . .

3-16. Hold Step Adjustment Location . . . . . . . . . . . . . . . . . . . . . . .

3-17. Band Pass Filter Adjustment Setup .....................

3-18. Band Pass Filter Adjustment Location . . . . . . . . . . . . . . . . . . . .

3-19. CRT Adjustment Location .........................

4-1. Overall Troubleshooting Flow . . . . . . . . . . . . . . . . . . . . . . . . 4-3

4-2. Source Test Setup ............................. 4-7

4-3. Test Head Diagnostic Test Setup ...... ...... ..... ..... 4-10

5-1. Power Supply Lines Simplied Block Diagram ................ 5-2

5-2. A40 SHUTDOWN LED Location . . . . . . . . . . . . . . . . . . . . . . . 5-6

5-3. A1 +5 VD LED Location . . . . . . . . . . . . . . . . . . . . . . . . . .

5-4. A2 Eight LED Locations .. ...... ...... ...... ..... .

5-5. Displayed Test Result .. ...... ...... ...... ...... .

5-6. Removing Line Fuse . . . . . . . . . . . . . . . . . . . . . . . . . . . .

5-7. A40J1 Output Voltage ...... ...... ...... ...... ...

5-8. A1 CPU Connector Locations . . . . . . . . . . . . . . . . . . . . . . . .

5-9. Fan Troubleshooting Setup . . . . . . . . . . . . . . . . . . . . . . . . .

5-10. A40 Pre-Regulator Troubleshooting Setup . . . . . . . . . . . . . . . . . .

5-11. A2 Output Voltage Measurement Setup ................... 5-19

5-12. A52 Test Point . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-21

5-13. Power Supply Block Diagram 1 . . . . . . . . . . . . . . . . . . . . . . . 5-22

5-14. Power Supply Block Diagram 2 . . . . . . . . . . . . . . . . . . . . . . .

5-15. Power Supply Block Diagram 3 . . . . . . . . . . . . . . . . . . . . . . .

6-1. Digital Control Group Simplied Block Diagram .. ...... ...... .

6-2. Eight A1 LEDs Patterns ..........................

3-10

3-11

3-12

3-13

3-14

3-15

3-16

3-17

3-18

3-19

3-20

3-21

3-22

3-23

3-24

5-7

5-8

5-10

5-12

5-13

5-15

5-16

5-23

5-24

6-2

6-5

Contents-12

6-3. Bootloader Display . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-7

7-1. Source Group Block Diagram . . . . . . . . . . . . . . . . . . . . . . . . 7-2

7-2. INT REF Test Setup ............................ 7-6

7-3. Typical INT REF Signal . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-7

7-4. FRAC N OSC Signal Level Test Setup .................... 7-8

7-5. FRAC N OSC Typical Signal . . . . . . . . . . . . . . . . . . . . . . . . . 7-9

7-6. Typical 520 MHz Signal . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-10

7-7. 520 MHz Signal Test Setup ......................... 7-10

7-8. EXT REF Test Setup . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-11

7-9. A5J4 Location . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-12

7-10. 1st LO OSC Signal Test Setup . . . . . . . . . . . . . . . . . . . . . . . . 7-13

7-11. Typical 1st LO OSC Signal (Single Mode) at A4A1J3 .. ...... ..... 7-14

7-12. 1st LO OSC Typical Signal (Single Mode) at A4J4 . . . . . . . . . . . . . . . 7-16

7-13. 21.42 MHz Signal Test Setup ...... ........ ...... .... 7-17

7-14. Typical 21.42 MHz Signal . . . . . . . . . . . . . . . . . . . . . . . . . . 7-18

7-15. 2nd LO OSC Test Setup . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-19

7-16. Typical 2nd Local Oscillator Signal ........ ...... ...... . 7-20

7-17. 2.05858 GHz Signal Test Setup ....................... 7-21

7-18. Typical 2.05858 GHz Signal . . . . . . . . . . . . . . . . . . . . . . . . . 7-22

7-19. A3A3 RF Signal Test Setup . . . . . . . . . . . . . . . . . . . . . . . . . 7-23

7-20. A7 Output Attenuator Control Signals . . . . . . . . . . . . . . . . . . . .

8-1. Receiver Group Block Diagram . . . . . . . . . . . . . . . . . . . . . . .

8-2. Receiver Group Troubleshooting Flow . . . . . . . . . . . . . . . . . . . .

8-3. A6 GAIN Test Location . . . . . . . . . . . . . . . . . . . . . . . . . . .

9-1. Test Head Block Diagram . . . . . . . . . . . . . . . . . . . . . . . . . .

9-2. Test Head Diagnostic Test Setup .. ...... ...... ........

9-3. Test Head Control Signal Check . . . . . . . . . . . . . . . . . . . . . . .

9-4. DC Voltage Check (DUT: Open) . . . . . . . . . . . . . . . . . . . . . . .

10-1. Service Key Menus . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

10-2. Service Menu ...............................

10-3. Tests Menu ........ ...... ...... ..... ...... .

10-4. Test Status on the Display .........................

10-5. Service Modes Menu . . . . . . . . . . . . . . . . . . . . . . . . . . . .

10-6. Bus Measurement Menu .... ...... ...... ...... ....

10-7. Correction Constants Menu . . . . . . . . . . . . . . . . . . . . . . . . .

7-25

8-2

8-3

8-4

9-2

9-3

9-5

9-7

10-1

10-3

10-5

10-6

10-14

10-16

10-22

10-8. Synthesizer Control Menu ......................... 10-24

10-9. OSC Control Menu . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-25

10-10. TRD Control Menu . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-27

10-11. IF Control Menu . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-28

10-12. Bootloader Menu ............................. 10-31

11-1. Simplied Block Diagram . . . . . . . . . . . . . . . . . . . . . . . . . .

11-2. Power Supply Functional Group, Simplied Block Diagram . . . . . . . . . .

11-3. A2 Eight Status LED . . . . . . . . . . . . . . . . . . . . . . . . . . . .

11-4. Digital Control Group, Simplied Block Diagram . . . . . . . . . . . . . . .

11-5. Source Simplied Block Diagram ......................

11-6. Receiver Simplied Block Diagram .....................

11-7. Simplied Impedance Measurement Block Diagram . . . . . . . . . . . . . .

11-8. Test Head Block Diagram . . . . . . . . . . . . . . . . . . . . . . . . . .

11-1

11-4

11-7

11-10

11-14

11-20

11-23

11-24

11-9. Source Group Block Diagram (1) .. ...... ...... ...... .. 11-26

11-10. Source Group Block Diagram (2) .. ...... ...... ...... .. 11-27

11-11. Receiver and Test Head Groups Block Diagram (1) . . . . . . . . . . . . . .

11-12. Receiver and Test Head Groups Block Diagram (2) . . . . . . . . . . . . . .

12-1. Top View 1 (Major Assemblies) .......................

12-2. Top View 2 (RF Flexible Cables) .... ........ ..... .....

12-3. Top View 3 (RF Semi-rigid Cables, and Wires) ................

11-28

11-29

12-4

12-6

12-8

Contents-13

12-4. Top View 4 (Miscellaneous Parts) ........ ...... ...... .. 12-10

12-5. Bottom View 1 (Major Assemblies) ..................... 12-12

12-6. Bottom View 2 (RF Cables, and Wires) ...... ...... ...... . 12-14

12-7. Bottom View 3 (Miscellaneous Parts) .................... 12-16

12-8. Front Assembly Parts 1 (Outside) . . . . . . . . . . . . . . . . . . . . . . 12-19

12-9. Front Assembly Parts 2 (Inside) . . . . . . . . . . . . . . . . . . . . . . . 12-20

12-10. Front Assembly Parts 3 (Inside) . . . . . . . . . . . . . . . . . . . . . . . 12-20

12-11. Rear Assembly Parts 1 (Outside) .... ...... ...... ...... 12-22

12-12. Rear Assembly Parts 2 (Inside) ....................... 12-24

12-13. CRT Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12-26

12-14. Test Head Parts .. ...... ...... ...... ....... ... 12-28

12-15. Miscellaneous Parts 1 (Side Views) ..................... 12-30

12-16. Misscellaneous Parts 2 (Chassis) . . . . . . . . . . . . . . . . . . . . . . . 12-31

12-17. Miscellaneous Parts 4 (On A1) .... ...... ...... ...... . 12-32

12-18. Miscellaneous Parts 4 (On A5) .... ...... ...... ...... . 12-32

13-1. Front Panel Screws ............................ 13-3

13-2. Rear Panel Assembly Removal ........ ...... ...... ... 13-4

13-3. A3A1, A3A2, and A3A3 Replacement . . . . . . . . . . . . . . . . . . . . 13-6

14-1. Firmware Revision Label . . . . . . . . . . . . . . . . . . . . . . . . . . 14-3

14-2. Bootloader Menu Display . . . . . . . . . . . . . . . . . . . . . . . . . . 14-4

A-1. Serial Number Plate .... ...... ...... ..... ...... .

B-1. Power Code Supplied ...........................

A-2

B-5

Contents-14

Tables

1-1. Recommended Test Equipment . . . . . . . . . . . . . . . . . . . . . . . 1-4

2-1. OSC Level Accuracy Test Setting for 1 m Test Head ............. 2-6

2-2. OSC Level Accuracy Test Setting for 3 m Test Head ............. 2-6

3-1. Required Binaries ............................. 3-4

4-1. Troubleshooting Information for Internal Test Failure ...... ...... 4-5

4-2. Source Test Settings ............................ 4-7

4-3. Default HP-IB Addresses . . . . . . . . . . . . . . . . . . . . . . . . . . 4-11

5-1. A40 Power Supplies ............................ 5-17

5-2. A40 Power Supplies ............................ 5-18

5-3. Power Supplies on A2 Post-Regulator .................... 5-20

6-1. Handler Interface Function Test ...................... 6-9

7-1. A3A3 RF Signal Test Settings . . . . . . . . . . . . . . . . . . . . . . . .

7-2. A7 Attenuation Test Settings . . . . . . . . . . . . . . . . . . . . . . . .

10-1. Test Status Terms .............................

10-2. Handler Interface Function Test ......................

11-1. Shutdown Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . .

11-2. Osc Level Setting vs. A7 Output Attenuator Setting .............

12-1. Manufacturers Code List . . . . . . . . . . . . . . . . . . . . . . . . . .

12-2. List of Abbreviations . . . . . . . . . . . . . . . . . . . . . . . . . . . .

12-3. Top View 1 (Major Assemblies) .......................

12-4. Top View 2 (RF Flexible Cables) .... ........ ..... .....

12-5. Top View 3 (RF Semi-rigid Cables, and Wires) ................

12-6. Top View 4 (Miscellaneous Parts) ......................

12-7. Bottom View 1 (Major Assemblies) .....................

12-8. Bottom View 2 (RF Cables, and Wires) .. ...... ...... .....

12-9. Bottom View 3 (Miscellaneous Parts) ....................

12-10. Front Assembly Parts 1 (Outside) ......................

7-24

7-26

10-7

10-12

11-7

11-18

12-2

12-3

12-5

12-7

12-9

12-11

12-13

12-15

12-17

12-19

12-11. Front Assembly Parts 2 (Inside) . . . . . . . . . . . . . . . . . . . . . . . 12-21

12-12. Rear Assembly Parts 1 (Outside) ...................... 12-23

12-13. Rear Assembly Parts 2 (Inside) .. ...... ...... ...... ... 12-25

12-14. CRT Assembly Parts ............................ 12-27

12-15. Test Head Parts .... ........ ...... ...... ...... 12-29

12-16. Miscellaneous Parts 1 (Side Viwes) .. ...... ...... ...... .

12-17. Misscellaneous Parts 2 (Chassis) . . . . . . . . . . . . . . . . . . . . . . .

12-18. Miscellaneous Parts 4 (On A1) .. ...... ...... ...... ...

12-19. Miscellaneous Parts 4 (On A5) .. ...... ...... ...... ...

12-20. Miscellaneous Parts 5 (Other Shields) .. ...... ...... ..... .

12-21. Miscellaneous Parts 6 (Accessories) .....................

14-1. Post Repair Procedures . . . . . . . . . . . . . . . . . . . . . . . . . . .

12-30

12-31

12-32

12-33

12-34

14-1

A-1. Manual Changes by Serial Number ..................... A-1

A-2. Manual Changes by Firmware Version . . . . . . . . . . . . . . . . . . . . A-1

B-1. Line Voltage Ranges ........ ...... ...... ...... .. B-1

Contents-15

General Information

INTRODUCTION

This

Service Manual

is a guide to servicing the HP 4286A RF LCR Meter. This manual contains

information about performance testing, adjusting, troubleshooting, and repairing the HP 4286A.

ORGANIZATION OF SERVICE MANUAL

This manual consists of major chapters listed below. This section describes the names of the

tabs and the content of each chapter.

Performance Tests

Adjustments and Correction Constants

provides procedures for performance testing the HP 4286A.

provides procedures for adjusting the HP 4286A after

repair or replacement of an assembly. In the OSC level adjustment, the correction constants

stored in the EEPROM on the A1 CPU are updated. The correction constants are updated by

using the adjustment program (PN 04286-65002).

Note

The next six chapters are the core troubleshooting chapters

Overall Troubleshooting.

outlines the HP 4286A troubleshooting, and provides

troubleshooting procedures to isolate the faulty functional group.Faulty assembly isolation

procedures for each functional group follow this chapter.

Power Supply Troubleshooting

Digital Control Troubleshooting

Source Troubleshooting

Receiver Troubleshooting

Test Head Troubleshooting

Note

The following chapters are, for the most part, reference material.

Service Key Menus

NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN

SERVICE MENU

documents the functions of the menus accessed from

. These menus let the operator test, verify, adjust, control, and troubleshoot

the HP 4286A. HP-IB service mnemonics are included.

Theory of Operation

explains the overall operation of the HP 4286A, the division into

functional groups, and the operation of each functional group

System

General Information 1-1

Replaceable Parts

miscellaneous chassis parts, together with ordering information.

provides part numbers and illustrations of the replaceable assemblies and

Replacement Procedures

certain assemblies are to be replaced.

Post-Repair Procedures

adjustments and verication procedures to be performed after repair or replacement of each

assembly.

Appendices

compatible with earlier shipment congurations of the HP 4286A), and the power

requirement.

Messages

contains the manual changes information (required to make this manual

contains the service related error message list.

provides procedures to disassemble portions of the HP 4286A when

contains the table of related service procedures. It is a table of

1-2 General Information

INSTRUMENT COVERED BY MANUAL

Hewlett-Packard uses a two-part, ten-character serial number that is stamped on the

serial number plate (see Figure 1-1) attached to the rear panel. The rst ve digits are the

serial prex and the last ve digits are the sux. The same prex is used for all identical

instruments. The prex changes only when a change is made to the instrument. However, the

sux is assigned sequentially and is unique to each instrument. The contents of this manual

apply to instruments with the serial number prexes listed under

SERIAL NUMBERS

on the

title page.

Figure 1-1. Serial Number Plate

An instrument manufactured after the printing date of this manual may have a serial number

prex that is not listed on the title page

. This unlisted serial number prex indicates that

the instrument is dierent from those described in this manual. The manual for an unlisted

instrument may be accompanied by a yellow

manual part number. The

Manual Changes

explains how to adapt the manual to newer instruments

Manual Changes

supplement or have a dierent

supplement contains \change information" that

In additions to change information, the supplement may contain information for correcting

errors (Errata) in the manual. To keep this manual as current and accurate as possible

Hewlett-Packard recommends that you periodically request the latest

Manual Changes

supplement. The supplement for this manual is identied by this manual's printing data and is

available from Hewlett-Packard. If the serial prex or number of an instrument is lower than

that on the title page of this manual, see

For information concerning serial number prexes not listed on the title page or in the

Changes

supplement, contact the nearest Hewlett-Packard oce.

Appendix A, Manual Changes

Manual

General Information 1-3

+ 269 hidden pages