HP 4286A Service Manual

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Page 1

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.

Page 2

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

Page 3

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.

Page 4

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

Page 5

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.

Page 6

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.

Page 7

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

Page 8

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

Page 9

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

Page 10

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

Page 11

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

Page 12

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

Page 13

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

Page 14

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

Page 15

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

Page 16

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

Page 17

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

Page 18

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

Page 19

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

Page 20

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

Page 21

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

Page 22

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

Page 23

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

Page 24

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

Page 25

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

Page 26

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

Page 27

Page 28

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

Page 29

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

Page 30

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

Page 31

TABLE OF SERVICE TEST EQUIPMENT

The rst part of Table 1-1 lists all of the equipment required to performance test, adjust, and

troubleshoot the HP 4286A. The table also notes the use and critical specications of each

item, and the recommended models. Equipment other than the recommended models may be

substituted if the equipment meets or exceeds the critical specications.

In addition to test equipment listed in Table 1-1, the following tools are also required:

Torx screwdriver, T15

Pozidriv screwdriver, pt size #1 (small)

Pozidriv screwdriver, pt size #2 (medium)

IC extractor

Open-end wrench, 1/4 inch

Open-end wrench, 5/16 inch

Torque wrench, 3/4 inch, 136 N-cm

Hex socket, 7/32 inch (5.5 mm)

Flat edge screwdriver

Table 1-1. Recommended Test Equipment

Equipment Critical Specications Recommended Model/ HP

Qty Use

Part Number

Computer HP 9000 Series 200/300

1 A

BASIC Operating System Revision 5.0 or above 1 A

Mass Storage 3.5 inch Microoppy Disk Drive 1 A

Program HP 4286A Adjustments Program (3.5 inch) PN 04286-65002 1 A

Performance Test Kit No substitute HP 16190A 1 P

APC7 Calibration Kit

Frequency Counter Frequency Range: 20 MHz to 1 GHz,

No substitute HP 16195A 1 P,T

HP 5343A Opt. 001 1 P,A

Time Base Error:61.9210

/year

Spectrum Analyzer Frequency Range: 100 kHz to 4 GHz HP 8566A/B 1 A, T

Power Meter No substitute HP 436A Opt. 022 , HP 437B,

1 P,A

or HP 438A

Power Sensor Frequency Range: 20 MHz to 1.8 GHz, Power:

HP 8482A 1 P,A

+5 dBm to020 dBm

Oscilloscope Band width100 MHz HP 54111D 1 T

Oscilloscope Probe Impedance: 1 M HP 10431A 1 T

Handler Simulator No substitute 04278-65001 1 T

P: Performance Tests,A:Adjustments and Correction Constants, T: Troubleshooting

Excluding HP 9826A

Required for testing the HP 4286A of option 001 which does not furnish the APC7 calibration kit.

1-4 General Information

Page 32

Table 1-1. Recommended Test Equipment (continued)

Equipment Critical Specications Recommended Model/ HP

Part Number

Cables,Adapters Type-N cable,50 HP 11500B or part of

HP 11851B

BNC cable, 61 cm, 50  PN 8120-1839 3 P,A,T

BNC cable, 122 cm, 50  PN 8120-1840 2 P,A,T

HP-IB cable HP 10833A/B/C 3 A

BNC(f)-SMA(f) adapter,50 PN 1250-0562 1 P,A

SMC(f)-BNC(f) adapter,50 PN 1250-0832 1 A

SMB(f)-BNC(f) adapter,50 PN 1250-1236 1 A

N(m)-BNC(f) adapter,50 PN 1250-1476 2 P,A,T

SMA(m)-BNC(f) adapter,50  PN 1250-1548 1 T

SMA(m)-SMA(f) right angle adapter,50 PN 1250-1741 1 T

APC3.5(m)-APC3.5(f) adapter,50 PN 1250-1866 1 P,A

APC7-N(f) adapter,50 HP 11524A or part of

HP 85032B

BNC(f)-SMA(m) adapter,50  PN 1250-1548 1 A

APC3.5(m)-APC7 adapter,50 PN 1250-1746

APC3.5(m)-APC3.5(f) right angle adapter,50 PN 1250-1249

Test xture stand PN 04286-60141

Qty Use

1 A, T

1 P,A,T

The HP 11851B includes three N(m)-N(m) cables of 61 cm and a N(m)-N(m) cable of 88 cm.

The HP 85032B includes two APC7-N(f) adapters.

HP 4286A furnished accessory

HP 4286A option 021/022 furnished accessory

General Information 1-5

Page 33

Page 34

Performance Tests

INTRODUCTION

This chapter provides the HP 4286A RF LCR Meter performance tests information. These

performance tests are used to verify that the HP 4286A's performance meets its specications.

General information about the performance tests is provided rst. Then, step by step

procedures for each test are provided.

Each test procedure consists of the following parts:

Description:

Test Equipment:

Procedure:

describes the test procedure.

describes test equipment required in the test.

describes the test procedure step by step.

GENERAL INFORMATION

This section provides general information about the performance tests

Warm Up Time

Allow the HP 4286A to warm up for at least 30 minutes before you execute any of the

performance tests.

Ambient Conditions



Perform all performance tests in an ambient conditions of 23

C,70%RH.

Calibration Cycle

The HP 4286A requires periodic performance verication to remain in calibration. The

frequency of performance verication depends on the operating and environmental conditions

under which the HP 4286A is used. Verify the HP 4286A's performance at least once a year

using the performance tests given in this chapter.

Performance Test Record

The performance test record lists all test points, acceptable test limits, test result entry

columns, and measurement uncertainties. The measurement uncertainty shows how accurately

the HP 4286A's specications are measured and depends on the test equipment used. The

listed measurement uncertainties are valid only when the recommended test equipment is

used.

The performance test record is provided at the end of this chapter

. Use the record as a master,

and make extra copies for performance testing.

Performance Tests 2-1

Page 35

Recommended Test Equipment

Table 1-1 lists the equipment required for performance testing the HP 4286A. Other equipment

may be substituted if the equipment meets or exceeds the critical specications given in

Table 1-1.

2-2 Performance Tests

Page 36

FREQUENCY ACCURACY TEST

Description

This test uses a frequency counter to measure the actual frequency of the HP 4286A test signal

when it is set to 1 GHz.

Test Equipment

Frequency Counter

BNC cable,61cm

APC3.5(m)-APC3.5(f) adapter1:::::: ::::::: ::::::::: ::::::::::::: ::::::: :::::: ::::

N(m)-BNC(f) adapter

BNC(f)-SMA(f) adapter

: This adapter is used to protect the HP 5343A's APC 3.5 Input connector, (it is sometimes

called a \connector saver.") In the test setup, the BNC(m)-SMA(f) adapter is connected to the

HP 5343A's APC 3.5 Input connector through this adapter.For more information on microwave

connectors and connector care, see

Procedure

1. Connect the test equipment as shown in Figure 2-1.

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

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

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

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

MICROWAVE CONNECTOR CARE

(PN 08510-90064).

HP 5343A

PN 8120-1839

PN 1250-1866

PN 1250-1476

PN 1250-0562

Figure 2-1. Frequency Accuracy Test Setup

Performance Tests 2-3

Page 37

Note

An APC3.5(m)-APC3.5(f) adapter is used between the BNC(f)-SMA(f) adapter

and the HP 5343A's APC 3.5 Input connector to protect the HP 5343A's APC

3.5 Input connector. In Figure 2-1, the SMA connector of the BNC(f)-SMA(f)

adapter is mated with the APC 3.5 connector of the \connector saver" adapter.

2. Initialize the frequency counter. Then set the controls as follows:

Controls Settings

Sample Rate Midrange

Range Switch 500 MHz-26.5 MHz

INT/EXT

Internal

Switch (rear

panel)

3. Press

Control

to initialize the HP 4286A. Then set the controls as follows:

Preset

Keystrokes

Settings

Frequency:

1 GHz

OSC Level:

Sweep Setup

NNNNNNNNNNNNNNNNNNNNNNNNNNNNN

LIST DONE

5,4

Source

5,4

NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN

CLEAR LIST

5,4

NNNNNNNNNNN

YES

NNNNNNNNNNN

ADD

NNNNNNNNNNNNNN

FREQ,4

5,4

NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN

SEGMENT DONE

G/n

0.2 V

4. Wait for the frequency counter reading to settle.

5. Subtract 1 GHz (HP 4286A setting) from the frequency counter reading, and record the

result on the performance test record.

2-4 Performance Tests

Page 38

OSC LEVEL ACCURACY TEST

Description

This test uses a power meter and a power sensor to measure the actual power level of the test

signal at several frequency points. In the case of the 1 m test head (standard/option 021), the

test frequency range is from 1 MHz to 1 GHz. In the case of 3 m test head (option 022/032), the

test frequency range is from 1 MHz to 500 MHz.

Test Equipment

Power Meter

Power Sensor

APC7-N(f) Adapter

APC3.5(m)-APC7 Adapter

APC3.5(m)-APC3.5(f) Right Angle Adapter

Test Fixture Stand

: HP 4286A furnished accessory

: HP 4286A option 021/022 furnished accessory

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

HP 436A Opt. 022, HP 437B, or HP 438A

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

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

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

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

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

PN 1250-1746

PN 1250-1249

PN 04286-60141

HP 8482A

HP 11524A

Procedure

1. Connect the power sensor to the power meter

. Calibrate the power meter for the power

sensor.

2. Connect the test head to the main frame

, and set the test head on the test xture stand.

Then connect the APC3.5(m)-APC7 adapter to the test head. In the case of option 021/022

(Straight Angle Test Head), use the APC3.5(m)-APC3.5(f) right angle adapter to connect the

APC3.5(m)-APC7 adapter to the test head.

3. Connect the power sensor to the test head as shown in Figure 2-2.

Figure 2-2. OSC Level Accuracy Test Setup

Performance Tests 2-5

Page 39

4. Press

Press

Preset

Source

to initialize the HP 4286A.

NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN

OSC UNIT:dBm

6. Set the controls as follows:

to set the OSC level unit to dBm.

Control

Key Strokes

Settings

Frequency:

1 MHz

OSC Level:

19 dBm

Sweep Setup

NNNNNNNNNNNNNNNNNNNNNNNNNNNNN

LIST DONE

NNNNNNNNNNNNNNNNNNNNNNNNNNNNN

Source

OSC LEVEL,405,415,495,4x15

NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN

CLEAR LIST

NNNNNNNNNNN

YES

NNNNNNNNNNN

ADD

NNNNNNNNNNNNNN

FREQ,415,4

NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN

SEGMENT DONE



7. Subtract019 dBm (HP 4286A setting) from the power meter reading, and record the result

on the performance test record.

Change the HP 4286A OSC level using

the HP 4286A frequency setting using

Source

Sweep Setup

NNNNNNNNNNNNNNNNNNNNNNNNNNNNN

OSC LEVEL

NNNNNNNNNNNNNN

EDIT

and numeric keys, and change

NNNNNNNNNNNNNN

FREQ

and numeric keys to test

the HP 4286A at the following test points:

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

OSC Level Center Frequency

19 dBm 1 MHz

13 dBm 10 MHz

7 dBm 100 MHz

7 dBm 500 MHz

1 dBm 1 GHz

7 dBm 1 GHz

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

OSC Level Center Frequency

19 dBm 1 MHz

13 dBm 10 MHz

7 dBm 100 MHz

7 dBm 500 MHz

2-6 Performance Tests

Page 40

MEASUREMENT ACCURACY TEST

Description

In this test, calibrated standards (from the HP 16190A Performance Test Kit) are measured

with the HP 4286A. The items tested are 1) Impedance Measurement Accuracy and 2) DC

Resistance Measurement Accuracy (for the contact check function). Measurement results of

both impedance and DC resistance are displayed simultaneously with one trigger.

Test Equipment

Performance Test Kit

3/4 inch Torque Wrench, 136 N-cm

APC7 Calibration Kit

APC3.5(m)-APC7 Adapter

APC3.5(m)-APC3.5(f) Right Angle Adapter

Test Fixture Stand

: Required for testing the HP 4286A of option 001 Delete APC7 Calibration Kit.

: HP 4286A furnished accessory

: HP 4286A option 021/022 furnished accessory

Note

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

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

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

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

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

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

DC resistance measurement accuracy is tested under the following

conditions: Standard:SHORT/50 , OSC level:1 V. Under other test

conditions, ignore the DC resistance readings.

If the HP 16190A 50  standard has no DC calibrated value for the DC

resistance measurement accuracy test, use its 1 MHz calibrated value instead.

Procedure

HP 16190A

PN 8710-1766

HP 16195A

PN 1250-1746

PN 1250-1249

PN 04286-60141

Figure 2-3. Impedance Measurement Accuracy Test Setup

Performance Tests 2-7

Page 41

1. Connect the test head to the main frame, and set the test head on the test xture stand.

Then connect the APC3.5(m)-APC7 adapter to the test head. In the case of option 021/022

(Straight Angle Test Head), use the APC3.5(m)-APC3.5(f) right angle adapter to connect the

APC3.5(m)-APC7 adapter to the test head. See Figure 2-3.

2. Press

Preset

to initialize the HP 4286A.

3. Create the sweep list shown in Figure 2-4, using the following procedure:

Figure 2-4. Sweep List for Measurement Accuracy Test

Press

Sweep Setup

NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN

CLEAR LIST

NNNNNNNNNNN

YES

b. Edit the rst segment as follows:

Control

Key Strokes

Settings

NNNNNNNNNNN

Frequency:

ADD

NNNNNNNNNNNNNN

FREQ,415,4

1 MHz

Averaging on

NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN

AVERAGING ON POINT,485,4x15

Point: 8

NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN

Press

SEGMENT DONE

NNNNNNNNNN

Press

ADD

to display the second segment. Then edit the segment in the same manner.

to store the segment.

Edit all the necessary segments. Then press



NNNNNNNNNNNNNNNNNNNNNNNNNNNNN

LIST DONE

to complete the sweep list.

2-8 Performance Tests

Page 42

Calibrating the HP 4286A

Note

Calibration must be done using the HP 4286A furnished calibration kit.

Or, in the case of the HP 4286A option 001 (Delete APC7 Calibration Kit),

calibration must be done using the stand alone HP 16195A APC7 Calibration

Kit. Do not use the HP 16190A performance test kit for calibration.

Calibration must be done when the HP 4286A is turned ON because

calibration data is erased when it is turned OFF.

Do not perform the low-loss capacitor calibration, (the HP 4286A

performance is specied without low-loss capacitor calibration).

NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN

1. Press

CALIBRATE MENU

Cal

NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN

Press

CAL POINTS [user]

and verify the softkey label changes to

NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN

CAL POINT [fixed]

Connect the 0 S termination of the APC7 calibration kit to the test head. Then press

to do the open calibration.

Disconnect the 0 S termination, and connect the 0  termination. Then press

the short calibration.

5. Disconnect the 0  termination, and connect the 50  termination. Then press

the load calibration.

NNNNNNNNNNNNNNNNNNNNNNNNNN

6. Press

DONE CAL

to complete the calibration.

NNNNNNNNNNNNNNNNN

SHORT

NNNNNNNNNNNNNN

LOAD

NNNNNNNNNNNNN

OPEN

to do

Turning on the DC Resistance Measurement Function

Press

NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN

Contact Check

RDC MEAS ON off

NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN

RDC MEAS on OFF

and verify the softkey label changes to

. The DC resistance measurement value is displayed.

Open Measurement Test

8. Record the open termination calibration values on the performance test record.

9. Connect the open termination to the test head, and torque the connection to 136 N-cm.

10.

11.

12.

Press

NNNNNNNNNNNNNNNNNNNNNNNNNNNNN

NNNNNNNNNNNNNNNNNNNNNNNNNN

meas

|Y|-rad

to set the measurement parameter tojYj-rad.

OSC LEVEL,415,4x15

NNNNNNNNNNNNNNNNNNNNNNNNNNNN

Trigger Mode

TRIGGER[]

to set the OSC level to 1 V.

NNNNNNNNNNNNNNNNNNN

MANUAL

NNNNNNNNNNNNNNNNNNN

RETURN

to set the HP 4286A to manual trigger

mode.

13. Press

Trigger

to measure.

14. Subtract the open calibrated values from the HP 4286A \jYj" display values. Then record

the test results on the performance test record.

15.

Press

Source

16. Press

Trigger

17. Subtract the open calibrated values from the HP 4286A \

NNNNNNNNNNNNNNNNNNNNNNNNNNNN

OSC LEVEL,4

to measure.

5,4

to set the OSC level to 200 mV .

jYj

" display values. Then record

the test results on the performance test record.

Performance Tests 2-9

Page 43

Short Measurement Test

18. Record the short termination calibration values on the performance test record.

19. Connect the short termination to the test head, and torque the connection to 136 N-cm.

20.

21.

22.

Press

Meas

Source

Trigger

NNNNNNNNNNNNNNNNNNNNNNNNN

|Z|-rad

to set the measurement parameter tojZj-rad.

NNNNNNNNNNNNNNNNNNNNNNNNNNNNN

OSC LEVEL,415,4x15

NNNNNNNNNNNNNNNNNNNN

SINGLE

to measure.

to set the OSC level to 1 V.

23. Subtract the short calibrated values from the HP 4286A \jZj" display values, and record the

test results on the performance test record.

24. Record the HP 4286A DC resistance display value on the performance test record.

25.

Press

Source

NNNNNNNNNNNNNNNNNNNNNNNNNNNNN

OSC LEVEL,4.5,425,4x15

to set the OSC level to 200 mV.

26. Press

Trigger

to measure.

27. Subtract the short calibrated values from the HP 4286A \jZj" display values, and record the

test results on the performance test record.

50  Measurement Test

28. Record the 50  termination calibration values on the performance test record.

29. Connect the 50  termination to the test head, and torque the connection to 136 N-cm.

30.

Press

Source

31. Press

Trigger

32. Subtract the 50  \jZj,rad" calibrated values from the HP 4286A \

NNNNNNNNNNNNNNNNNNNNNNNNNNNNN

OSC LEVEL,4

to measure.

5,4

to set the OSC level to 1 V.

jZj,

rad" display

values, and record the test results on the performance test record.

33. Subtract the 50  DC calibrated values from the HP 4286A DC resistance display value

, and

record the test result on the performance test record.

34.

Press

35. Press

Source

Trigger

NNNNNNNNNNNNNNNNNNNNNNNNNNNNN

OSC LEVEL,4

to measure.

5,4

to set the OSC level to 200 mV.

36. Subtract the 50  calibrated values from the HP 4286A \jZj,rad" display values, and

record the test results on the performance test record.

10 cm Airline with Open Test

37. Record the 10 cm airline with open termination calibration values on the performance test

record.

38. Connect the 10 cm airline and open termination to the test head, using the following

procedures (see Figure 2-5 ).

a. Fully retract the threads on the test head APC7 connector. Then insert the marked side

tip of the airline center conductor into the connector center conductor.

b. Gently cover the airline center conductor with the airline outer conductor (with the HP

logo side down). (To prevent damage, do not let the center conductor scrape the edge

of the outer conductor.) Mate the outer conductors. Then torque the connection to

136 N-cm. (A 1/2 inch open end wrench may be necessary to hold the airline stationary

2-10 Performance Tests

Page 44

c. Gently inserts the airline center conductor into the open termination center conductor.

Mate the outer conductors. Then torque the connection to 136 N-cm.

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

39.

Press

40. Press

Source

Trigger

NNNNNNNNNNNNNNNNNNNNNNNNNNNNN

OSC LEVEL,4

to measure.

5,4

to set the OSC level to 1 V.

41. Subtract the 10 cm airline with open calibrated values from the HP 4286A \jZj,rad"

display values, and record the test results on the performance test record.

42.

Press

Source

43. Press

Trigger

44. Subtract the 10 cm airline with open calibrated values from the HP 4286A \

NNNNNNNNNNNNNNNNNNNNNNNNNNNN

OSC LEVEL,4.5,425,4x15

to measure.

to set the OSC level to 200 mV .

jZj,

rad"

display values, and record the test results on the performance test record.

Performance Tests 2-11

Page 45

10 cm Airline with Short Test

45. Record the 10 cm airline with short termination calibration values on the performance test

record.

46. Connect the 10 cm airline and short termination to the test head APC-7 connector, using

the following procedures (see Figure 2-6).

a. Remove the open termination from the airline.

b. Gently inserts the airline center conductor into the short termination center conductor.

Mate the outer conductors. Then torque the connection to 136 N-cm. (A 1/2 inch open

end wrench may be necessary to hold the airline stationary.)

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

47.

Press

48. Press

Source

Trigger

NNNNNNNNNNNNNNNNNNNNNNNNNNNN

OSC LEVEL,4

to measure.

5,4

to set the OSC level to 1 V.

49. Subtract the 10 cm airline with short calibrated values from the HP 4286A \jZj,rad"

display values. Then record the test results on the performance test record. (Ignore the

HP 4286A display values at 800 MHz.)

50.

Press

Source

51. Press

Trigger

52. Subtract the 10 cm airline with short calibrated values from the HP 4286A \

NNNNNNNNNNNNNNNNNNNNNNNNNNNNN

OSC LEVEL,4.5,425,4x15

to measure.

to set the OSC level to 200 mV.

jZj,

rad"

display values. Then record the test results on the performance test record. (Ignore the

HP 4286A display values at 800 MHz.)

2-12 Performance Tests

Page 46

PERFORMANCE TEST RECORD

Hewlett-Packard 4286A RF LCR Meter

Serial No. Mainframe Test Date

Test Head Temperature

APC7 Calibration Kit Humidity

Tested by:

Frequency Accuracy Test

Frequency Test Limit Test Result Measurement

1 GHz

10.0 kHz kHz

Osc Level Accuracy Test

1mTest Head (Standard / Option 031)

Osc Level Frequency Test Limit Test Result Measurement

Uncertainty

2.3 kHz

Uncertainty

19 dBm 1 MHz

13 dBm 10 MHz

7 dBm 100 MHz

7 dBm 500 MHz

1 dBm 1 GHz

7 dBm 1 GHz

3mTest Head (Option 022/032)

Osc Level Frequency Test Limit Test Result Measurement

19 dBm 1 MHz

13 dBm 10 MHz

7 dBm 100 MHz

7 dBm 500 MHz

3.00 dB dB

2.00 dB dB

3.00 dB dB

2.00 dB dB

0.18 dB

0.19 dB

0.20 dB

0.21 dB

0.20 dB

Uncertainty

0.18 dB

0.19 dB

0.20 dB

0.21 dB

Performance Tests 2-13

Page 47

Measurement Accuracy Test

(1) Impedance Measurement Accuracy Test

Standard: Open

Osc Level: 1V

Frequency Measurement

Parameter

1 MHz

10 MHz

100 MHz

200 MHz

300 MHz

500 MHz

600 MHz

800 MHz

1 GHz

jYj

Standard: Open

Osc Level: 200 mV

Frequency Measurement

Parameter

1 MHz

10 MHz

jYj

Calibration

Value

Calibration

Value

Test Limit Test Result Measurement

Uncertainty

S6

30.2S

32.3S

52.7S

76.6S

100S

147S

181S

233S

286S



621



628



635

Test Limit Test Result Measurement

Uncertainty

S6

30.2S

32.3S



34 nS

0.34S

3.4S

6.7S

10.0S

16.7S

34 nS

0.34S

100 MHz

200 MHz

300 MHz

500 MHz

600 MHz

800 MHz

1 GHz

jYj

S6

53.2S

77.6S

101S

150S

184S

237S

291S



3.4S



6.7S



10.0S



16.7S



621



628



635

2-14 Performance Tests

Page 48

Standard: Short

Osc Level: 1V

Frequency Measurement

Parameter

1 MHz

10 MHz

100 MHz

200 MHz

300 MHz

500 MHz

600 MHz

800 MHz

1 GHz

Standard: Short

Osc Level: 200 mV

Frequency Measurement

Parameter

1 MHz

10 MHz

jZj

Calibration

Value

0.00 m

Calibration

Value

0.00 m

Test Limit Test Result Measurement

Uncertainty

20.5 m m

25.0 m m

70.0 m m

120 m m

170 m m

270 m m

320 m m

420 m m

520 m m

1.8 m

2.0 m

10 m

20 m

30 m

40 m

50 m

70 m

80 m

Test Limit Test Result Measurement

Uncertainty

20.5 m m

25.0 m m

1.8 m

2.0 m

100 MHz

200 MHz

300 MHz

500 MHz

600 MHz

800 MHz

1 GHz

jZj

0.00 m

70.0 m m

120 m

170 m m

270 m m

320 m

420 m m

520 m m

m

10.0 m

20 m

30 m

40 m

50 m

70 m

80 m

Performance Tests 2-15

Page 49

Standard: 50 

Osc Level: 1V

Frequency Measurement

Parameter

1 MHz

10 MHz

100 MHz

200 MHz

300 MHz

500 MHz

600 MHz

800 MHz

jZj



jZj



jZj



jZj



jZj



jZj



jZj



jZj



Calibration

Value

Test Limit Test Result Measurement

Uncertainty



436 m m

90 m

mrad68.72 mrad mrad61.80 mrad



445 m m

90 m

mrad68.90 mrad mrad61.80 mrad



mrad610.7 mrad mrad



mrad614.2 mrad mrad



mrad616.2 mrad mrad



mrad620.2 mrad mrad



mrad626.2 mrad mrad



mrad630.2 mrad mrad

535 m m

710 m m

810 m m

1.01  m

1.31  

1.51  

100 m

2.0 mrad

125 m

2.5 mrad

150 m

3.0 mrad

200 m

4.0 mrad

0.25 

5.0 mrad

0.25 

5.0 mrad

1 GHz

jZj





1.71  

mrad634.2 mrad mrad

0.25 

5.0 mrad

2-16 Performance Tests

Page 50

Standard: 50 

Osc Level: 200 mV

Frequency Measurement

Parameter

1 MHz

10 MHz

100 MHz

200 MHz

300 MHz

500 MHz

600 MHz

800 MHz

1 GHz

jZj



jZj



jZj



jZj



jZj



jZj



jZj



jZj



jZj

Calibration

Value

Test Limit Test Result Measurement

Uncertainty



496 m m

90 m

mrad69.92 mrad mrad61.80 mrad



505 m m

90 m

mrad610.1 mrad mrad61.80 mrad



595 m m

100 m

mrad611.9 mrad mrad62.00 mrad



mrad615.4 mrad mrad



mrad617.4 mrad mrad



mrad621.4 mrad mrad



mrad627.4 mrad mrad



mrad631.4 mrad mrad



770 m m

870 m m

1.07  m

1.37  

1.57  

1.77  

125 m

2.5 mrad

150 m

3.0 mrad

200 m

4.0 mrad

0.25 

5.0 mrad

0.25 

5.0 mrad

0.25 

1 GHz



mrad635.4 mrad mrad

5.0 mrad

Performance Tests 2-17

Page 51

Standard: 10 cm Airline with Open

Osc Level: 1V

Frequency Measurement

Parameter

1 MHz

10 MHz

100 MHz

200 MHz

300 MHz

500 MHz

600 MHz

800 MHz

jZj



jZj



jZj



jZj



jZj



jZj



jZj



jZj



Calibration

Value

Test Limit Test Result Measurement

Uncertainty

k

14.5 k k

rad6665 mrad mrad

k

167  

rad676.6 mrad mrad



3.82  

rad617.8 mrad mrad



1.68  

rad616.6 mrad mrad



1.01  m

rad616.6 mrad mrad



523 m m

rad623.2 mrad mrad



455 m m

rad646.4 mrad mrad



622 m m

rad645.8 mrad mrad

43 

2.0 mrad

4.3 

2.0 mrad

0.43 

2.0 mrad

0.25 

2.5 mrad

182 m

3.0 mrad

90 m

4.0 mrad

88 m

9.0 mrad

122 m

9.0 mrad

1 GHz

jZj





rad634.2 mrad mrad

1.51  

0.27 

6.0 mrad

2-18 Performance Tests

Page 52

Standard: 10 cm Airline with Open

Osc Level: 200 mV

Frequency Measurement

Parameter

1 MHz

10 MHz

100 MHz

200 MHz

300 MHz

500 MHz

600 MHz

800 MHz

1 GHz

jZj



jZj



jZj



jZj



jZj



jZj



jZj



jZj



jZj

Calibration

Value

Test Limit Test Result Measurement

Uncertainty

k

14.5 k k

rad6667 mrad mrad

k

170  

rad677.8 mrad mrad



4.08  

rad619.0 mrad mrad



1.80  

rad617.8 mrad mrad



1.08  m

rad617.8 mrad mrad



550 m m

rad624.4 mrad mrad



467 m m

rad647.6 mrad mrad



639 m m

rad647.0 mrad mrad



1.57  

43 

2.0 mrad

4.3 

2.0 mrad

0.43 

2.0 mrad

0.25 

2.5 mrad

182 m

3.0 mrad

90 m

4.0 mrad

88 m

9.0 mrad

122 m

9.0 mrad

0.27 

1 GHz



rad635.4 mrad mrad

6.0 mrad

Performance Tests 2-19

Page 53

Standard: 10 cm Airline with Short

Osc Level: 1V

Frequency Measurement

Parameter

1 MHz

10 MHz

100 MHz

200 MHz

300 MHz

500 MHz

600 MHz

1 GHz

jZj



jZj



jZj



jZj



jZj



jZj



jZj



jZj



Calibration

Value

Test Limit Test Result Measurement

Uncertainty

m621.3 m m

rad6188 mrad mrad



32.3 m m

rad630.1 mrad mrad



149 m m

rad613.9 mrad mrad



341 m m

rad615.2 mrad mrad



593 m m

rad616.2 mrad mrad



1.98  

rad622.7 mrad mrad



5.85  

rad637.7 mrad mrad



3.29  

rad638.1 mrad mrad

1.7 m

15 mrad

4.3 m

4.0 mrad

27 m

2.5 mrad

67 m

3.0 mrad

110 m

3.0 mrad

0.31 

3.5 mrad

0.78 

5.0 mrad

0.52 

6.0 mrad

2-20 Performance Tests

Page 54

Standard: 10 cm Airline with Short

Osc Level: 200 mV

Frequency Measurement

Parameter

1 MHz

10 MHz

100 MHz

200 MHz

300 MHz

500 MHz

600 MHz

1 GHz

jZj



jZj



jZj



jZj



jZj



jZj



jZj



jZj



Calibration

Value

Test Limit Test Result Measurement

Uncertainty

m621.4 m m

rad6189 mrad mrad



33.6 m m

rad631.3 mrad mrad



161 m m

rad615.1 mrad mrad



368 m m

rad616.4 mrad mrad



637 m m

rad617.4 mrad mrad



2.09  

rad623.9 mrad mrad



6.03  

rad638.9 mrad mrad



3.39  

rad639.3 mrad mrad

1.7 m

15 mrad

4.3 m

4.0 mrad

27 m

2.5 mrad

67 m

3.0 mrad

110 m

3.0 mrad

0.31 

3.5 mrad

0.78 

5.0 mrad

0.52 

6.0 mrad

Performance Tests 2-21

Page 55

(2) DC Resistance Measurement Accuracy Test

Standard: Short

Osc Level: 1V

Test Limit Test Result

25.0 m Pass [ ] Fail[ ]

Standard: 50 

Osc Level: 1V

Calibration

Value

Test Limit Test Result Measurement

Uncertainty



1.80  

50 m

2-22 Performance Tests

Page 56

Adjustments and Correction Constants

INTRODUCTION

This chapter describes the Adjustments and Correction Constants procedures required to ensure

that the HP 4286A RF LCR Meter is within its specications. These adjustments should be

performed along with periodic maintenance to keep the HP 4286A in optimum operating

condition. The recommended calibration period is 12 months. If proper performance cannot

be achieved after the Adjustments and Correction Constants procedures are performed, see

Chapter 4.

Note

The correction constants are empirically derived data that is stored in memory

and then recalled to rene the HP 4286A's measurement and to dene its

operation.

SAFETY CONSIDERATIONS

This manual contains NOTEs,CAUTIONs, and WARNINGs that must be followed to ensure the

safety of the operator and to keep the instrument in a safe and serviceable condition. The

adjustments must be performed by qualied service personnel.

Warning

Any interruption of the protective ground conductor (inside or outside

the HP 4286A) or disconnection of the protective ground terminal can

make the instrument dangerous. Intentional interruption of the protective

ground system for any reason is prohibited.

The removal or opening of covers for adjustment, or removal of parts other than those that are

accessible by hand will expose circuits containing dangerous voltage levels.

Remember that the capacitors in the HP 4286A can remain charged for several minutes, even

through you have turned the HP 4286A OFF and unplugged it.

Warning

The adjustments described in this chapter are performed with power

applied and the protective covers removed. Dangerous voltage levels exist

at many points and can result in serious personal injury or death if you

come into contact with them.

Adjustments and Correction Constants 3-1

Page 57

REQUIRED EQUIPMENT

Table 1-1 lists the equipment required to perform the Adjustments and the Correction Constants

procedures described in this chapter. Use only calibrated test equipment when adjusting the

HP 4286A. If the recommended test equipment is not available, equipment whose specications

are equal to, or surpasses those of the recommended test equipment may be used.

WARM-UP FOR ADJUSTMENTS AND CORRECTION CONSTANTS

Warm-up the HP 4286A for at least 30 minute before performing any of the following

Adjustments and Correction Constants procedures to ensure proper results and correct

instrument operation.

INSTRUMENT COVER REMOVAL

To gain access to the adjustment components, you need to remove the top cover and the side

covers. If additional information is required when removing these covers

, see Chapter 13.

ORDER OF ADJUSTMENTS

When performing more than one Adjustments or Correction Constants procedure, perform them

in the order they appear in this chapter. The procedures are presented in the following order:

40 MHz Reference Oscillator Frequency Adjustment

520 MHz Level Adjustment

Comb Generator Adjustment

Second Local PLL Lock Adjustment

Source VCXO Adjustment

Third Local VCXO Adjustment

Source Mixer Local Leakage Adjustment

OSC Level Correction Constants

Hold Step Adjustment

Band Pass Filter Adjustment

3-2 Adjustments and Correction Constants

Page 58

ADJUSTMENT PROGRAM

This section provides general information about the HP 4286A adjustment program that is used

for updating the OSC Level Correction Constants.

The adjustment program is provided on one double-sided diskette. The diskette's HP part

number is 04286-65002 . The les contained on the diskette are as follows:

ADJ4286A Adjustments Program

TE A4286A Equipment Conguration Program

Note

To prevent accidental deletion or destruction of the program, make working

copies of the furnished master diskette (HFS or SRM system). Use the working

copies for daily use. Keep the master diskettes in a safe place and use them

only for making working copies.

Keyboard and Mouse Operation

The menus in \ADJ4286A" use a window format. The window format menu supports keyboard

and mouse operations as follows:

Keyboard Operation

1. Press

2. Choose the highlighted item by pressing

5,4

keys until your preference is highlighted.

RETURN

5or4

SELECT

5(4

ENTER

5or4

EXECUTE

,ona

Nimitz Keyboard).

NNNNNNNNNNNNNN

QUIT

press

5(4



NNNNNNNNNNNNNN

EXIT

CONTINUE

is displayed in a menu, select one of these to exit the menu. Otherwise

, on a Nimitz Keyboard) to exit. When you exit a menu, the program

displays another menu.

Press

to access on-screen help information for the selection you have

Note

highlighted. Help information appears in a display window.

Press

RETURN

5or4

SELECT

5(4

ENTER

5or4

EXECUTE

, on a Nimitz Keyboard) to turn

o the help screen.

Mouse Operation

1. Slide the mouse up or down until your preference is highlighted.

2. Choose the highlighted item by pressing left-hand button on the mouse, or slide the mouse

to the right.

NNNNNNNNNNNNNN

QUIT

NNNNNNNNNNNNNN

EXIT

is displayed in a menu, select one of these to exit the menu. Otherwise

slide the mouse to the left to exit. When you exit a menu, the program displays another

menu.

Note

Press the right-hand mouse button to access on-screen help information for the

selection you have highlighted. Help information appears in a display window.

Press the left-hand mouse button to turn o the help screen.

Adjustments and Correction Constants 3-3

Page 59

Controller Requirement

The following controller system is required to run the adjustments program.

Controller HP 9000 Series 200/300 computer.

Excluding HP 9826A computers.

Must have inverse video capability.

At least 4 M bytes of RAM.

Mass Storage At least one 3.5 inch HP-IB Flexible Disk Drive.

HFS formatted hard disk system or SRM system are supported.

The controller must be equipped with an HP BASIC version between 5.1 and 5.13, and have

the language extension les listed in Table 3-1.

Table 3-1. Required Binaries

Name Version Description

GRAPH 5.2 Graphics

GRAPHX 5.2 Graphics Extensions

IO 5.1 I/O

MAT 5.1 Matrix Statements

PDEV 5.0 Program Development

KBD 5.1 Keyboard Extensions

CLOCK 5.0 Clock

MS 5.1 Mass Storage

ERR 5.1 Error Message

DISC 5.0 Small Disc Driver

CS80 5.0 CS80 Disc Driver

HPIB 5.0 HP-IB Interface Driver

FHPIB 5.0 HP-IB Interface Driver

CRTB 5.2 Bit-mapped CRT Driver

CRTA 5.1 Alpha CRT Driver

CRTX 5.1 CRT Extensions

EDIT 5.1 List and Edit

SRM 5.1 Shared Resource Management

DCOMM 5.0 Datacomm Interface Driver

HFS 5.3 Hierarchical File System

COMPLEX 5.1 Complex Arithmetic

3-4 Adjustments and Correction Constants

Page 60

Preparation for Using the Adjustment Program

Before using the HP 4286A Adjustment Program, it is necessary to run the program

\TE A4286A" to dene the types and HP-IB addresses of the equipment used in the

adjustment. Once you set the types and HP-IB addresses of the equipment using the

\TE A4286A", you don't have to perform the \TE A4286A" for adjustment. The procedure is

as follows.

Note

1. Turn the computer and bring up the BASIC system.

2. Set the mass storage unit specier (MSUS) to the address of the drive or the directory where

\TE A4286A" is located.

3. Load and run \TE A4286A".

4. As the program instruct, select the types of the power meter/power sensor to be used and

enter their HP-IB addresses

If you want to change the types and HP-IB addresses of the equipment, re-perform the

\TE A4286A".

The program \TE A4286A" must be located at the address of the drive or the

directory where the Adjustment Program \ADJ4286A" will be run.

Adjustments and Correction Constants 3-5

Page 61

40 MHz REFERENCE OSCILLATOR FREQUENCY ADJUSTMENT

The purpose of this procedure is to adjust the 40 MHz reference oscillator frequency.

Required Equipment

Frequency Counter

SMB(f)-BNC(f) adapter

BNC cable,61cm

Procedure

1. Connect the equipment as shown in Figure 3-1. The A5 \CAL OUT" connector location is

shown in Figure 3-2. Do not connect anything to the rear panel \EXT REF" input connector.

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

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

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

HP 5343A Option 001

PN 1250-1236

PN 8120-1839

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

3-6 Adjustments and Correction Constants

Page 62

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

2. Set the frequency counter as follows:

Input Impedance 50 

Frequency Range 10 Hz - 500 MHz

3. Adjust A5 \40 MHz FREQ ADJ" until the frequency counter reading is within

20 MHz620 Hz. The adjustment location is shown in Figure 3-2.

Adjustments and Correction Constants 3-7

Page 63

520 MHz LEVEL ADJUSTMENT

The purpose of this procedure is to adjust the 520 MHz output level.

Required Equipment

Spectrum Analyzer

SMC(f)-BNC(f) adapter

N(m)-BNC(f) adapter

BNC cable,61cm

Procedure

1. Turn the HP 4286A OFF.

2. Remove the \J" cable from the A5 \520 MHz OUT" connector. The connector location is

shown in Figure 3-3.

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

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

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

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

HP 8566A/B

PN 1250-0832

PN 1250-1476

PN 8120-1839

Figure 3-3. 520 MHz Level Adjustment Location

3. Connect the equipment as shown in Figure 3-4.

3-8 Adjustments and Correction Constants

Page 64

Figure 3-4. 520 MHz Level Adjustment Setup

4. Set the spectrum analyzer as follows:

CENTER Frequency 520 MHz

SPAN 1 MHz

RBW 100 kHz

5. Turn the HP 4286A ON.

6. Adjust A5 \520 MHz LEVEL ADJ" until the spectrum analyzer reading for 520 MHz signal

level is within -1560.2 dBm. The adjustment location is shown in Figure 3-3.

7. Turn the HP 4286A OFF.

8. Reconnect the \J" cable to the A5 \520 MHz OUT" connector

Adjustments and Correction Constants 3-9

Page 65

COMB GENERATOR ADJUSTMENT

The purpose of this procedure is to adjust the comb generator output level.

Required Equipment

Spectrum Analyzer

SMB(f)-BNC(f) adapter

N(m)-BNC(f) adapter

BNC cable, 122 cm

Procedure

1. Turn the HP 4286A OFF.

2. Remove the SMB connector termination from the A5 \COMB OUT" connector, and connect

the equipment as shown in Figure 3-5. The A5 \COMB OUT" connector location is shown in

Figure 3-6.

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

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

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

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

HP 8566A/B

PN 1250-1236

PN 1250-1476

PN 8120-1840

Figure 3-5. Comb Generator Adjustment Setup

3-10 Adjustments and Correction Constants

Page 66

Figure 3-6. Comb Generator Adjustment Location

3. Set the spectrum analyzer as follows:

Start Frequency 400 MHz

Stop Frequency 1 GHz

RBW 1 MHz

Reference Level020 dBm

Scale 5 dB/div

4. Turn the HP 4286A ON.

5. Adjust A5 \COMB DC BIAS ADJ" until the spectrum analyzer display indicates the

following:

720 MHz Signal Level

480 MHz to 920 MHz Flatness<8dB

The adjustment location is shown in Figure 3-6. A typical spectrum analyzer display is

shown in Figure 3-7.

0406

3 dBm

Adjustments and Correction Constants 3-11

Page 67

Figure 3-7. Comb Generator Output

3-12 Adjustments and Correction Constants

Page 68

SECOND LOCAL PLL LOCK ADJUSTMENT

The purpose of this procedure is to lock the second local Phase Lock Loop (PLL).

Required Equipment

Spectrum Analyzer

BNC(f)-SMA(m) adapter

N(m)-BNC(f) adapter

BNC cable, 122 cm

Procedure

1. Turn the HP 4286A OFF.

2. Remove the \D" cable from the A3A1 \ALC Out" connector. Remove the \I" cable from the

A3A2 \Second Local Out" connector. The connector locations are shown in Figure 3-8.

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

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

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

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

HP 8566A/B

PN 1250-1548

PN 1250-1476

PN 8120-1840

Figure 3-8. Second Local PLL Adjustment Location

3. Connect the equipment as shown in Figure 3-9.

Adjustments and Correction Constants 3-13

Page 69

Figure 3-9. Second Local PLL Adjustment Setup

4. Set the spectrum analyzer as follows:

Center Frequency 2.08 GHz

Span 400 MHz

RBW 1 MHz

5. Turn the HP 4286A ON.

5,4

.29:

NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN

EXECUTE TEST

6. Press the following keys to execute adjustment test No

PRESET

5,4

SYSTEM

NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN

SERVICE MENU

NNNNNNNNNNNNNNNNN

TESTS,4

5,4

The tuning voltage of the second local oscillator is displayed in the \R: " eld.

7. Adjust A3A2 \Second Local Adj" until 2.08 GHz appears constantly on the spectrum analyzer

display and the HP 4286A reading is within 068 mU. Then press

NNNNNNNNNNNNNN

CONT

to complete the

adjustment. If 2.24 GHz appears, rotate \Second Local Adj" clockwise. If 1.92 GHz appears,

rotate \Second Local Adj" counterclockwise. The adjustment location is shown in Figure 3-8.

8. Turn the HP 4286A OFF.

9. Reconnect the \I" cable to the A3A2 \Second Local Out" connector

. Reconnect the \D"

cable to the A3A1 \ALC Out" connector.

3-14 Adjustments and Correction Constants

Page 70

SOURCE VCXO ADJUSTMENT

The purpose of this procedure is to optimize the source VCXO oscillation.

Required Equipment

None

Procedure

1. Do not connect anything to the HP 4286A mainframe front terminals.

2. Press the following keys to execute adjustment test No.31:

PRESET

5,4

SYSTEM

NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN

SERVICE MENU

NNNNNNNNNNNNNNNNN

TESTS,435,415,4x15

NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN

EXECUTE TEST

The VCXO output level is displayed in the \R :" eld

3. Rotate \VCXO LEV" and conrm that a voltage peak appears in a rotation to conrm that

the VCXO circuit is correct. Then press

4. Rotate \VCXO LEV" slowly to enable instrument to memorize the peak voltage. Then press

NNNNNNNNNNNNNN

CONT

5. Adjust \VCXO LEV" until the VCXO level is within the limits and \PASS" is displayed. The

limit is the memorized peak voltage +0/-1 %. Then press

NNNNNNNNNNNNNN

CONT

NNNNNNNNNNNNNN

CONT

to complete the adjustment.

Figure 3-10. Source VCXO Adjustment Location

Adjustments and Correction Constants 3-15

Page 71

THIRD LOCAL VCXO ADJUSTMENT

The purpose of this procedure is to optimize the source VCXO oscillation.

Required Equipment

None

Procedure

1. Turn the HP 4286A OFF.

2. To gain access the adjustment component, remove the side panel on the control keys side.

3. Do not connect anything to the HP 4286A mainframe front terminals.

4. Press the following keys to execute adjustment test No.28:

PRESET

5,4

SYSTEM

NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN

SERVICE MENU

NNNNNNNNNNNNNNNNN

TESTS,425,485,4x15

NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN

EXECUTE TEST

The VCXO output level is displayed in the \R :" eld.

5. Rotate \VCXO ADJ" and conrm that two voltage peaks appear in a rotation to conrm that

the VCXO circuit is correct. Then press

6. Rotate \VCXO ADJ" slowly to enable instrument to memorize the peak voltage

NNNNNNNNNNNNN

CONT

7. Adjust \VCXO ADJ" until the VCXO level is within the limits and \PASS" is displayed. The

limit is the memorized peak voltage +0/-1 %

NNNNNNNNNNNNNN

CONT

. Then press

NNNNNNNNNNNNNN

CONT

. Then press

to complete the adjustment.

Figure 3-11. Third Local VCXO Adjustment Location

3-16 Adjustments and Correction Constants

Page 72

SOURCE MIXER LOCAL LEAKAGE ADJUSTMENT

The purpose of this procedure is to minimize the source mixer local leakage.

Required Equipment

Spectrum Analyzer

N(m)-BNC(f) adapter (2 required)

BNC cable, 122 cm (2 required)

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

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

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

Procedure

1. Connect the equipment as shown in Figure 3-12.

HP 8566A/B

PN 1250-1476

PN 8120-1840

Figure 3-12. Source Mixer Local Leakage Adjustment Setup

2. Set the spectrum analyzer as follows:

Center Frequency 100 MHz

Span 100 MHz

RBW 300 kHz

3. Press the following keys to execute adjustment test No.30:

PRESET

5,4

SYSTEM

NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN

SERVICE MENU

NNNNNNNNNNNNNNNNN

TESTS,4

5,4

NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN

EXECUTE TEST

Adjustments and Correction Constants 3-17

Page 73

4. Adjust the local leakage adjustments until the spectrum analyzer reading at the 78.58 MHz

signal level is less than040 dBm. Then press

adjustment locations are shown in Figure 3-13.

NNNNNNNNNNNNN

CONT

to complete the adjustment. The

Note

Carefully rotate the local leakage adjustments so that the adjustments are

not misadjusted by much. It would be very dicult to recover from a large

misadjustment.

Figure 3-13. Source Mixer Leakage Adjustment Location

3-18 Adjustments and Correction Constants

Page 74

OSC LEVEL CORRECTION CONSTANTS

The purpose of this procedure is to obtain the correction constants that correct the OSC signal

linearity and atness.

Required Equipment

Power Meter

Power Sensor

APC3.5-APC7 Adapter

APC3.5(m)-APC3.5(f) Right Angle Adapter

Test Fixture Stand

: HP 4286A furnished accessory

: HP 4286A option 021/022 furnished accessory

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

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

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

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

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

PN 1250-1746

PN 1250-1249

PN 04286-60141

HP 436A

HP 8482A

Procedure

1. Connect the HP 4286A and the computer with an HP-IB cable.

2. If the program \TE A4286A" has not been performed for the equipment to be used, perform

it (see the \Preparation for Using the Adjustment Program" paragraph).

3. Set the mass storage unit specier (MSUS) to the address of the drive or the directory where

the Adjustment Program \ADJ4286A" is located.

4. Load and run \ADJ4286A".

5. Choose \INITIAL SETUP" if you want to update the Calibrated V

6. Choose \OSC Level CC" for updating OSC Level Correction Constants

instructions on the controller's screen until the program ends

alue for the power sensor.

.Follow the

. Figure 3-14 and Figure 3-15

show the equipment setup for the Correction Constants.

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

Adjustments and Correction Constants 3-19

Page 75

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

3-20 Adjustments and Correction Constants

Page 76

HOLD STEP ADJUSTMENT

The purpose of this procedure is to minimize the hold step level of the A6 receiver sample hold

output.

Required Equipment

None

Procedure

1. Turn the HP 4286A OFF.

2. To gain access the adjustment component, remove the side panel on the control keys side.

3. Do not connect anything to the HP 4286A mainframe front terminals.

4. Turn the HP 4286A ON.

5. Press the following keys to execute adjustment test No.26:

PRESET

5,4

SYSTEM

NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN

SERVICE MENU

NNNNNNNNNNNNNNNNN

TESTS,425,465,4x15

NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN

EXECUTE TEST

The hold step level is displayed in the \R :" eld.

6. Adjust \HOLD STEP ADJ" until the hold step level is within 0

displayed. Then press

NNNNNNNNNNNNNN

CONT

to complete the adjustment. The adjustment location is shown

in Figure 3-16.

200 mU and \PASS" is

Figure 3-16. Hold Step Adjustment Location

Adjustments and Correction Constants 3-21

Page 77

BAND PASS FILTER ADJUSTMENT

The purpose of this procedure is to optimize the A6 receiver IF band pass lter.

Required Equipment

Type-N Cable,61cm

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

HP 11500B or part of HP 11851B

Procedure

1. Turn the HP 4286A OFF.

2. To gain access the adjustment component, remove the side panel on the control keys side.

3. Connect the equipment as shown in Figure 3-17.

Figure 3-17. Band Pass Filter Adjustment Setup

4. Turn the HP 4286A ON.

5,4

.27:

NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN

EXECUTE TEST

The receiver gain

5. Press the following keys to execute adjustment test No

PRESET

5,4

SYSTEM

NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN

SERVICE MENU

NNNNNNNNNNNNNNNN

TESTS,4

5,4

monitor value is displayed in the \jZj:" eld.

6. Adjust \BPF ADJ 1" to maximize the monitor value. Then adjust \BPF ADJ 2" to maximize

the monitor value and press

NNNNNNNNNNNNNN

CONT

to complete the adjustment. The adjustment location is

shown in Figure 3-18 . (The interaction of \BPF ADJ1" and \BPF ADJ 2" is negligible.)

3-22 Adjustments and Correction Constants

Page 78

Figure 3-18. Band Pass Filter Adjustment Location

Adjustments and Correction Constants 3-23

Page 79

Display Adjustment

The purpose of this procedure is to adjust the CRT display.

Note

Test Equipment

Digital Multimeter HP 3456A, HP 3457A or HP 3458A

Dual Banana Plug to Alligator Clip Lead HP 11002A

Procedure

Warning

1. Turn HP 4286A OFF.

2. Remove CRT unit from the unit according to the CRT Assembly Removal section in the

Replacement Procedures chapter.

3. Remove the top cover of the CRT unit by unscrewing six screws

4. Connect the Dual Banana Plug to Alligator Clip Lead to the Multimeter

The display adjustments are optional and normally the CRT does not require

adjustment. You should use this procedure only when the display is obviously

out of adjustment.

Dangerous voltage levels exist in this CRT unit and can result in serious

personal injury or death if you come into contact with them.

5. Connect the high lead to the end of R901 closest to the fuse

chassis. The component is shown in Figure 3-19.

Figure 3-19. CRT Adjustment Location

, and low lead to the HP 4286A

3-24 Adjustments and Correction Constants

Page 80

6. Turn HP 4286A ON.

7. Adjust +B ADJ until the digital multimeter reading is +14.00 V.

Press

PRESET

5,4

SYSTEM

NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN

SERVICE MENU

NNNNNNNNNNNNNNNNN

TESTS,435,435,4x15

NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN

EXECUTE TEST

NNNNNNNNNNNNNN

CONT

display the Test Pattern.

9. Adjust V.HO (vertical hold) for vertical synchronization.

10. Adjust Focus for the best focus.

11. Adjust V.Lin (vertical linearity) until the grid pattern crosses at right angles.

12. Press softkey 8 (the bottom softkey) to exit the test pattern.

13.

Press

PRESET

5,4

SYSTEM

NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN

SERVICE MENU

NNNNNNNNNNNNNNNNN

TESTS,435,425,4x15

NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN

EXECUTE TEST

NNNNNNNNNNNNNN

CONT

display the Test Pattern.

14. Adjust V.Size (vertical size) until the vertical length of the rectangle is approximately 100

mm.

15. Adjust H.Hold (horizontal hold) to center the display horizontally.

16. Press softkey 8 (the bottom softkey) to exit the test pattern.

Adjustments and Correction Constants 3-25

Page 81

Page 82

Overall Troubleshooting

This chapter consists of the following sections:

Troubleshooting Summary

Inspecting the Power On Sequence

Verifying Functional Groups

Troubleshooting the HP-IB System

The

Troubleshooting Summary

troubleshooting ow diagram.

outlines how to troubleshoot the HP 4286A using the

Inspecting the Power ON Sequence

power on sequence.

Verifying Functional Groups

faulty functional group.

Troubleshooting the HP-IB System

used in an HP-IB system.

provides verication procedures to isolate the problem to the

begins the troubleshooting procedures by inspecting the

gives some hints for troubleshooting when the HP 4286A is

Overall Troubleshooting 4-1

Page 83

TROUBLESHOOTING SUMMARY

The troubleshooting strategy of this manual is based on a verication (rather than symptomatic)

approach. Verication procedures and the resulting corrective actions are given in the manual.

By following these directions, you will determine the faulty assembly that must be replaced.

Figure 4-1 shows the overall troubleshooting ow. The following paragraphs provide brief

descriptions of the troubleshooting sequence:

Troubleshooting is started by performing the Inspect Power On Sequence.

Inspecting the power on sequence and verifying faulty groups may indicate one or more faulty

groups in the HP 4286A's ve functional groups. (The HP 4286A can be divided into ve

functional groups: power supply, digital control, source, receiver, and transducer.)

A faulty assembly is isolated to a faulty functional group according to the troubleshooting

procedure for each faulty group. The troubleshooting procedures are given in Chapters 5 to 9.

A faulty assembly is replaced according to Chapters 12 and 13. Chapter 12 lists the replaceable

parts and Chapter 13 provides replacement procedures for the major parts.

The procedures required after an assembly replacement, such as adjustments and performance

tests, are given in Chapter 14.

Troubleshooting hints that can be used when the HP 4286A is used in an HP-IB system are

given in this chapter. When the HP 4286A is used in an HP-IB system, the HP 4286A's HP-IB

function needs to be veried as the rst step in troubleshooting.

4-2 Overall Troubleshooting

Page 84

Figure 4-1. Overall Troubleshooting Flow

Overall Troubleshooting 4-3

Page 85

INSPECTING THE POWER ON SEQUENCE

This section begins the troubleshooting procedures by inspecting the power on sequence.

Check the Fan

Turn the HP 4286A power on. Inspect the fan on the rear panel.

The fan should be rotating and audible.

In case of unexpected results, check the AC line power to the HP 4286A. Check the fuse (the

rating is listed on the rear panel). Check the line voltage setting. To set the line voltage, see

the

Power Requirements

in Appendix C.

If the problem persists, continue with Chapter 5.

Check the Power On State

Turn on the HP 4286A and verify for the following events in the listed order:

1. Beep sounds in a about second.

2. The display comes up bright and focused.

In case of unexpected results, continue with Chapter 6.

Check Error Message

Turn the HP 4286A power on, and inspect the display

. No error message should be displayed.

If one of the error messages listed below is displayed, follow the instructions described below

For any other message, see the

Error Messages

in Messages.

Error Messages Instruction

POWER ON TEST FAILED

EEPROM CHECK SUM ERROR

This indicates the power on self-test failed. Continue

with

Troubleshooting When Power On Self-test Failed

This indicates that the correction constants stored in the

EEPROM on the A1 CPU are invalid or the EEPROM is faulty

Continue with Chapter 6.

Svc

(Status Annotation) This indicates that the correction constants stored in the

EEPROM on the A1 CPU are invalid or the EEPROM is faulty.

Continue with Chapter 6.

POWER FAILED ON - - -

One or more of the A2 power supplies (+65 V, +15 V, +8.5

V, +5.3 V,+5V,-5V, -15 V) is displayed in

---

of the

message. The displayed power supplies are shutdown due to

trouble in the A2 post-regulator. Continue with Chapter 5.

POWER FAILED ON PostRegHot

This indicates the A2 power supplies (+15 V, +8.5 V, +5.3

V,+5V,-5V, -15 V) are shutdown because the heat sink on

the A2 post-regulator is too hot. Cool down the HP 4286A

for about 30 minutes. Then turn the HP 4286A power on. If

this message is still displayed, replace the A2 post-regulator.

PHASE LOCK LOOP UNLOCKED

4-4 Overall Troubleshooting

This indicates one or more of PLLs (phase lock loops) in

the oscillators is not working properly. Continue next with

Troubleshooting When Power On Self Test Failed

Page 86

Troubleshooting When Power On Self-Test Failed

Note

The HP 4286A performs the power on self-test every time the HP 4286A is

turned on. In the power on self-test, internal diagnostic tests 1, 4, 5, 6, 7, and

8 through 15 are executed sequentially. The rst failed test indicates the most

probable faulty assembly.For more information about the internal tests, see

Chapter 10.

If the power on self-test fails and the \

POWER ON TEST FAILED

" message is displayed, execute

the ALL INT test, using to the following procedure, to identify the rst failed test. Then

replace the probable faulty assembly (see the Table 4-1 ).

Press

INT.

b. Press

PRESET

5,4

SYSTEM

NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN

EXECUTE TEST

NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN

SERVICE MENU

to execute the ALL INT test.

NNNNNNNNNNNNNNNNN

TESTS,405

, and

4x15

to access internal test 0: ALL

c. Wait until the test result (PASS or FAIL) is displayed.

d. Press the

4*5,4+5

keys to nd the rst occurrence of a FAIL message for test 1 and tests 4

through 14.

Table 4-1. Troubleshooting Information for Internal T

est Failure

Test No. First Failed Test Troubleshooting Information

1 A1 CPU Replace A1 CPU.

4 A2 POST REGULATOR Continue with the next

Test Fail

section.

A2 POST REGULATOR

5 A6 A/D CONVERTER The A6 receiver IF is the most probable faulty

board. Replace the A6 receiver IF.

6 A5 REFERENCE OSC The A5 synthesizer is the most probable faulty

board. Replace the A5 synthesizer.

7 A5 FRACTIONAL N The A5 synthesizer is the most probable faulty

board. Replace the A5 synthesizer.

8 A4A1 1ST LO OSC The A4A1 1st LO OSC is the most probable

faulty board. Replace the A4 1st LO/Receiver

RF.

9 A3A2 2ND LO OSC The A3A2 2nd LO OSC is the most probable

faulty board. Replace the A3A2 2nd LO.

10 A3A1 DIVIDER The A3A1 Source Vernier is the most probable

faulty board. Replace the A3A1 Source

Vernier.

11 A6 3RD LO OSC The A6 receiver IF is the most probable faulty

board. Replace the A6 receiver IF.

12 A3A1 SOURCE OSC The A3A1 Source Vernier is the most probable

faulty board. Replace the A3A1 Source

Vernier.

13 A6 SEQUENCER The A6 receiver IF is the most probable board.

Replace the A6 receiver IF.

14 SOURCE LEVEL Continue with Chapter 7.

EEPROM with data needs to be replaced, see Chapter 13.

Overall Troubleshooting 4-5

Page 87

A2 POST REGULATOR Test Fail

If internal test 4: A2 POST REGULATOR is the rst failed test, the power supply functional

group is the most probable faulty group. See Chapter 5.

Also, the test failure might be caused by A6 A/D converter trouble. Execute internal test 5:

A6 A/D CONVERTER to verify the A/D converter, with the following procedure. If the test 5

fails, suspect the A5 synthesizer and A6 receiver IF in addition to the power supply functional

group.

Press

455,4x15

NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN

EXECUTE TEST

to execute internal test 5: A6 A/D CONVERTER.

ii. Wait until the test result (PASS or FAIL) is displayed.

VERIFYING FUNCTIONAL GROUPS

This section provides procedures to isolate the faulty group.

Source Verication

Verify source group operation using the following procedure:

Test Equipment

Frequency Counter

Power meter

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

Power Sensor

BNC cable,61cm

N(m)-BNC(f) adapter

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

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

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

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

Procedure

1. Perform the frequency accuracy test (see Chapter 2).

If the test fails, go to Chapter 7.

2. Calibrate the power meter for the power sensor

3. Connect the equipment as shown in Figure 4-2.

HP 5343A Option 001

HP 436A Opt. 022, HP 437B, or HP 438A

HP 8482A

PN 8120-1839

PN 1250-1476

4-6 Overall Troubleshooting

Page 88

4. Turn the HP 4286A power on.

Press

NNNNNNNNNNNNNNNNN

FRONT

Press

SYSTEM

to select the source correction constants for the front output connector

Source

NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN

SERVICE MENU

NNNNNNNNNNNNNNNNNNNNNNNNNN

OSC UNIT

NNNNNNNNNNN

dBm,4

Figure 4-2. Source Test Setup

NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN

SERVICE MODES

5,4

NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN

CORRECTION CONSTANTS

to set the osc level to019 dBm.

NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN

OSC LVL CC

7. Perform the test for all settings listed in T

is within the test limits shown in the table

able 4-2. Conrm that each power meter reading

Table 4-2. Source Test Settings

Frequency Osc Level Test Limit

1 MHz

10 MHz

100 MHz

1 GHz 7 dBm

19 dBm

13 dBm

7 dBm

2dB

If the test fails, perform the OSC level correction constants according to Chapter 3. If the

test still fails, go to Chapter 7.

If the test passes, continue with the next step.

8. Press

10.

, and the HP 4286A test frequency is set to 1 GHz.

Preset

NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN

Press

SYSTEM

label changes to

SERVICE MENU

NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN

OSC auto MANgto set the HP 4286A manual OSC level mode

NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN

Press

OUTPUT ATT [AUTO]

NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN

OUTPUT ATT [10 dB]

NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN

SERVICE MODES

NNNNNNNNNN

OSC

NNNNNNNNNNNNNNNNN

10 dB

(and verify the label changes to

) to set the output attenuator to 10 dB

NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN

OSC AUTO man,f

then the

Overall Troubleshooting 4-7

Page 89

11.

12. Conrm that the power meter reading is greater than 6.5 dBm.

NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN

Press

OSC DAC AUTO man

NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN

OSC DAC VALUE,435,425,405,405,405,4x15

If the test fails, go to Chapter 7.

If the test passes, continue with the next

(and verify the label changes to

to set the DAC value to 32,000.

Receiver Test

NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN

OSC DAC auto MAN

procedure.

4-8 Overall Troubleshooting

Page 90

Receiver Verication

Verify the receiver operation using the following procedure.

Test Equipment

Type-N Cable,61cm

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

HP 11500B or part of HP 11851B

Procedure

1. Verify that nothing is connected to the front panel of the HP 4286A mainframe.

2. Turn the HP 4286A power on.

3. Press

Press

PRESET

SYSTEM

to initialize the HP 4286A.

NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN

SERVICE MENU

NNNNNNNNNNNNNNNN

TESTS,425,405,4x15

When \RECEIVER GAIN" is displayed, press

NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN

to access the RECEIVER GAIN test.

EXECUTE TEST

5. Perform the test according to the displayed instructions.

If the test fails, go to Chapter 8.

6. Press

NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN

press

EXECUTE TEST

to access the A6 V/I NORMALIZER test. When \A6 VI NORMALIZER" is displayed,

7. Perform the test according to the displayed instructions.

If the test fails, replace A6 receiver IF.

8. Press

to access the FRONT ISOL'N test. When \FRONT ISOL'N" is displayed, press

NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN

EXECUTE TEST

9. Perform the test according to the displayed instructions.

If the test fails, go to Chapter 8. If the test passes

procedure.

, continue with the next

Transducer Test

Overall Troubleshooting 4-9

Page 91

Test Head Verication

Verify the test head operation using the following procedure.

Test Equipment

APC7 Calibration Kit

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

HP 4286A furnished accessory

N(m)-N(m) cable

Procedure

1. Turn the HP 4286A power on.

Press

SYSTEM

NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN

SERVICE MENU

NNNNNNNNNNNNNNNNN

TESTS,425,445,4x15

to access the TEST HEAD diagnostic

test.

NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN

3. Press

EXECUTE TEST

Connect the HP 4286A S and R connectors with the N(m)-N(m) cable, and press

to perform the test. The test procedure is as follows:

NNNNNNNNNNNNNN

CONT

The HP 4286A mainframe is calibrated for the test.

b. Connect the test head to the mainframe, and connect the APC3.5(m)-APC7 adapter to the

test head using the test xture stand as shown in Figure 4-3.

c. Connect the open termination of the APC7 calibration kit to the test head, and press

NNNNNNNNNNNNNN

CONT

. The open test is performed.

d. In the same manner, perform the short and 50  tests with the short and 50 

terminations of the APC7 calibration kit, following the displayed instructions

If the test fails, go to Chapter 9.

If the test passes, the HP 4286A is probably operating correctly

4-10 Overall Troubleshooting

Figure 4-3. Test Head Diagnostic Test Setup

Page 92

TROUBLESHOOTING HP-IB SYSTEM

Check the HP 4286A's HP-IB functions with a known working passive peripheral (like a plotter

or printer).

1. Connect the peripheral using a good HP-IB cable to the HP 4286A. Turn the HP 4286A

power on.

Press

NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN

Local

ADDRESS: PLOTTER

NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN

SYSTEM CONTROLLER

NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN

ADDRESS PRINTER

. Then press

NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN

SET ADDRESSES

and press

to see the peripheral addresses recognized by the

HP 4286A. The factory default addresses are:

Table 4-3. Default HP-IB Addresses

DEVICE HP-IB ADDRESS

Plotter 5

Printer 1

3. Set the HP-IB address of the peripheral to the address that the HP 4286A recognizes

Peripheral addresses are often set with a rear panel switch. See the applicable peripheral

manual to read or change its address.

4. Turn the peripheral power on.

Press

COPY

, and

NNNNNNNNNNNNNN

PLOT

NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN

PRINT [STANDARD]

. A copy of the display should plot or print

out.

If the result is a copy of the display

If the result is not a copy of the display

, the HP-IB function is working in the HP 4286A.

, suspect HP-IB problems in the HP 4286A.

Continue with Chapter 6.

Check the External Controller

If unexpected operations occur when controlling the HP 4286A with an external controller

perform the following checks to verify the problem is not with the controller

Check compatibility (it must be HP 9000 series 200/300). See the controller and the BASIC

system manuals.

The HP-IB interface hardware must be installed in the controller. See the controller and the

BASIC system manuals.

The I/O and HP-IB binaries must be loaded. See the B

ASIC system manuals.

Check the select code. See the BASIC system manuals.

Check the HP-IB cables. See the BASIC system manuals.

Check the programming syntax. See the BASIC system manuals.

If the HP 4286A is still operating incorrectly after these checks are veried, continue with

Chapter 6.

Overall Troubleshooting 4-11

Page 93

Page 94

Power Supply Troubleshooting

INTRODUCTION

Use this procedure only if you have read Chapter 4 and you believe the problem is in the

power supply. The procedure is designed to let you identify the bad assembly within the power

supply functional group in the shortest possible time.

The power supply functional group consists of:

A40 Pre-Regulator

A2 Post-Regulator

A52 DC-DC Converter

All assemblies, however, are related to the power supply functional group because power

is supplied to each assembly. Figure 5-1 shows all power lines in simplied block diagram

form. For more information about the signal paths and specic connector pin numbers

Figure 5-13, Figure 5-14, and Figure 5-15 at the end of this chapter

If an assembly is replaced, see Chaptre 14. It tells what additional tests or adjustments need to

be done after replacing any assembly.

, see

Power Supply Troubleshooting 5-1

Page 95

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

5-2 Power Supply Troubleshooting

Page 96

POWER SUPPLY TROUBLESHOOTING SUMMARY

This summary gives an overview of the power supply troubleshooting procedure.Technicians

who are already familiar with troubleshooting the power supply may save time by following

this summary instead of reading the entire procedure. Headings in this summary match the

headings in the procedure.

Start Here

1. Check Error Messages

If one of the error messages listed below is displayed, continue with the

TROUBLESHOOT

THE A2 POST-REGULATOR.

POWER FAILED ON - - -

POWER FAILED ON PostRegHot

2. Check the Fan is Rotating

If the fan is not rotating, continue with the

FIND OUT WHY THE FAN IS NOT

ROTATING.

3. Check the A40 SHUTDOWN LED

If the A40 SHUTDOWN LED is on, continue with the

FIND OUT WHY THE A40

SHUTDOWN LED IS ON.

4. Check the A1 +5 VD LED

If the A1 +5 VD LED is not on, continue with the

FIND OUT WHY THE +5 VD LED IS

NOT ON STEADILY.

5. Check the A2 Eight LEDs

If one or some of the A2 eight LEDs are o, continue with the

TROUBLESHOOT THE A2

POST-REGULATOR.

6. Run the Internal Test 4: A2 POST REGULATOR

If the internal test 4 fails, continue with the

TROUBLESHOOT THE 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 SHUTDWON LED is On

1. Disconnect the Cable from the A40J1

2. Disconnect the Cable from the A51J2

3. Disconnect the Cable from the A1J10

4. Remove Assemblies

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

1. Check the A40 Pre-Regulator

2. Disconnect Cables on the A1 CPU

3. Remove Assemblies

Power Supply Troubleshooting 5-3

Page 97

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

Troubleshoot the A52 DC-DC Converter

1. Disconnect Flat Cables from A52J1 and A52J3.

2. Check the A52 TP4 voltage.

5-4 Power Supply Troubleshooting

Page 98

START HERE

1. Check Error Messages

Turn the HP 4286A power on. If one of error messages listed below appears on the display,

follow the instruction of the displayed error message. If no error message is displayed,

continue with the next

Check the Fan is Rotating.

Error Messages Instruction

POWER FAILED ON - - -

One or some of A2 power supplies, +65 V, +15 V, +8.5V,

+5.3 V,+5V,-5V, -15 V are displayed in

---

of the

message. The displayed power supplies are shut down due

to the trouble on the A2 post-regulator. Continue with the

POWER FAILED ON PostRegHot

CHECK THE A2 EIGHT LEDs

This indicates A2 power supplies, +15 V, +8.5 V, +5.3 V,

in this

START HERE.

+5 V,-5V, -15 V, are shut down due to too hot heat sink on

A2 post-regulator. Cool down the HP 4286A for about 30

minutes. Then turn the HP 4286A power on. If this message

is still displayed, replace A2 post-regulator.

These messages are associated with the power supplies functional group

. These messages

indicate the A2 protective shutdown circuit is shutting down some of A2 power supplies to

protect them from over current, over voltage, under voltage, and too hot conditions.For more

information about the A2 shutdown circuit, see the Figure 5-14 P

Note

These messages are displayed only after the power on sequence

ower Supply Block Diagram 2.

. When one

of these message is displayed, the HP 4286A's front keys are disabled. In the

power on sequence, the HP 4286A checks the shutdown status of the A2 power

supplies, +65 V, +15 V,+5V,-5V, -15 V. If a power supply is shut down,

the HP 4286A displays an error message and stops its operation. Once the

HP 4286A stops the operation, any front key operations are disabled. The only

way to reset the HP 4286A is turning the HP 4286A power o.

2. Check the Fan is Rotating

Look at the fan on the rear panel. Check the fan is rotating.

If the fan is not rotating, continue with the

FIND OUT WHY THE FAN IS NOTROTATING

this chapter.

If the fan is rotating, continue with the next

Check the A40 SHUTDOWN LED.

3. Check the A40 SHUTDOWN LED

There is a LED, SHUTDOWN LED, on the A40 pre-regulator.Perform the following procedure

to check it. The SHUTDOWN LED is described in the next

A40 SHUTDOWN LED

a. Turn the HP 4286A power o.

b. Remove the HP 4286A top cover and shield plate.

c. Turn the HP 4286A power on.

d. Look at the A40 SHUTDOWN LED. The LED is normally o. The SHUTDOWN LED location

on A40 pre-regulator is shown in Figure 5-2.

Power Supply Troubleshooting 5-5

Page 99

If the A40 SHUTDOWN LED is on, check the cable connection between A40J2 and A2J4.

If the connection is good, continue with the

IS ON

If the A40 SHUTDOWN LED is o, continue with the

procedure.

in this chapter.

FIND OUT WHY THE A40 SHUTDOWN LED

Check the A1 +5 VD LED

in this

Figure 5-2. A40 SHUTDOWN LED Location

A40 Shutdown LED

The A40 SHUTDOWN LED turning on indicates some of A40 power supply is shut down by the

A40 shutdown circuitry.

There are two FAN conditions, rotating and not rotating when the SHUTDOWN LED turns on.

When the fan is not rotating, the shutdown circuit is probably activated by the over voltage

condition on the +70 V power line or the F

power supplies, +70 V, +25 V,+5VD, +18 V, +7.8 V, -7.8 V, and -18 V are shut down.

When the fan is rotating, the shutdown circuit is probably activated by the over voltage

condition on the +5 VD power line. In this condition, the A40 power supplies,+5VD, +18 V,

+7.8 V, -7.8 V, and -18 V are shut down.

For more information about the A40 shutdown circuit operation, see the Figure 5-13 P

Supply Block Diagram 1.

Note

Once the A40 shutdown circuit is activated, the only way to reset the circuit

is turning the HP 4286A power o. Wait a minute after turning the HP 4286A

o. Then turn it on.

AN LOCK signal missing. In this condition, all A40

ower

5-6 Power Supply Troubleshooting

Page 100

4. Check the A1 +5 VD LED

a. Remove the HP 4286A's bottom cover.

b. Turn the HP 4286A power on.

c. Look at the +5 VD LED. The +5 VD LED location on A1 CPU is shown in Figure 5-3. The

LED is normally on.

If the +5 VD LED is o, continue with the

TROUBLESHOOT+5VDPOWER SUPPLY

this chapter.

If the +5 VD LED is on, the +5 VD power supply is veried with 95% condence level.

Continue with the

5% uncertainty, perform steps in the next

Check A2 Eight LEDs

in this procedure. If you want to conrm the last

Measure the A1 +5 VD Voltage

Figure 5-3. A1 +5 VD LED Location

Measure the A1 +5 VD Voltage

Measure the DC voltage on a test point A1TP8 (+5 VD) using a voltmeter. Check the voltmeter

reading is within 4.59 V to 5.61 V.

If the voltmeter reading is out of the limits, continue with the

IS NOT ON STEADILY

FIND OUT WHY THE A1 LED

If the voltmeter reading is within the limits, continue with the next step.

5. Check the A2 Eight LEDs

a. Remove the HP 4286A's top cover and shield.

b. Turn the HP 4286A power on.

c. Look at the all A2 eight LEDs. The A2 LED locations are shown in Figure 5-4. The all LEDs

are normally on.

If one or some of the LEDs are o, continue with the

POST-REGULATOR

in this chapter.

TROUBLESHOOTA2

Power Supply Troubleshooting 5-7

HP 4286A Service Manual

Specifications and Main Features

Frequently Asked Questions

User Manual