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Errata
Title & Document Type: 4286A Service Manual
Manual Part Number: 04286-90111
Revision Date: April 1996
HP References in this Manual
This manual may contain references to HP or Hewlett-Packard. Please note that Hewlett-
Packard'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 ideal. If we find a better
copy in the future, we will add it to the Agilent website.
Support for Your Product
Agilent no longer sells or supports this product. You will find any other available
product information on the Agilent Test & Measurement website:
www.tm.agilent.com
Search for the model number of this product, and the resulting product page will guide
you to any available information. Our service centers may be able to perform calibration
if no repair parts are needed, but no other support from Agilent is available.
HP 4286A RF LCR Meter
Service Manual
SERIAL NUMBERS
This manual applies directly to instruments with serial number pre x JP1KC.
For additional important information about serial numbers, read \INSTRUMENT
COVERED BY THIS MANUAL" in General Information of this service manual.
ABCDE
HP Part No. 04286-90111
Printed in JAPAN April 1999
Notice
The information contained in this document is subject to change without notice.
This document contains proprietary information that is protected by copyright. All rights are
reserved. No part of this document may be photocopied, reproduced, or translated to another
language without the prior written consent of the Hewlett-Packard Company.
Hewlett-Packard Japan, LTD.
Kobe Instrument Division
1-3-2, Murotani, Nishi-Ku, Kobe-Shi
Hyogo 651-2241 Japan
APC7
is a U.S. registered trademark of the Bunker Ramo Corporation.
R
Copyright 1995, 1999 Hewlett-Packard Japan, LTD.
c
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 : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : First Edition
April 1999 : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : Second Edition
iii
Safety Summary
The following general safety precautions must be observed during all phases of operation,
service, and repair of this instrument. Failure to comply with these precautions or with speci c
WARNINGS elsewhere in this manual may impair the protection provided by the equipment.
In addition it violates safety standards of design, manufacture, and intended use of the
instrument.
The Hewlett-Packard Company assumes no liability for the customer's failure to comply with
these requirements.
Note HP 4286A is designed for use in INSTALLATION CATEGORY II according to IEC
61010-1 and POLLUTION DEGREE 1 according to IEC 61010-1 and IEC 60664-1.
HP 4286A is an INDOOR USE product.
Note LEDs in HP 4286A are Class 1 in accordance with IEC60825-1.
CLASS 1 LED PRODUCT
Ground The Instrument
To avoid electric shock hazard, the instrument chassis and cabinet must be connected to a
safety earth ground by the supplied power cable with earth blade.
DO NOT Operate In An Explosive Atmosphere
Do not operate the instrument in the presence of
ammable gasses or fumes. Operation of any
electrical instrument in such an environment constitutes a de nite safety hazard.
Keep Away From Live Circuits
Operating personnel must not remove instrument covers. Component replacement and internal
adjustments must be made by quali ed maintenance personnel. Do not replace components
with the power cable connected. Under certain conditions, dangerous voltages may exist even
with the power cable removed. To avoid injuries, always disconnect power and discharge
circuits before touching them.
DO NOT Service Or Adjust Alone
Do not attempt internal service or adjustment unless another person, capable of rendering rst
aid and resuscitation, is present.
DO NOT Substitute Parts Or Modify Instrument
Because of the danger of introducing additional hazards, do not install substitute parts
or perform unauthorized modi cations to the instrument. Return the instrument to a
Hewlett-Packard Sales and Service Oce for service and repair to ensure that safety features
are maintained.
iv
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.
v
Typeface Conventions
Bold Boldface type is used when a term is de ned. For example: icons are
symbols.
Italics 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: copy
lename means to type the word copy, to type a space, and then to
type the name of a le such as file1.
Computer Computer font is used for on-screen prompts and messages.
4HARDKEYS5 Labeled keys on the instrument front panel are enclosed in 4 5.
NNNNNNNNNNNNNNNNNNNNNNNNNN NNNNN
SOFTKEYS Softkeys located to the right of the CRT are enclosed in .
vi
Certi cation
Hewlett-Packard Company certi es that this product met its published speci cations at the
time of shipment from the factory. Hewlett-Packard further certi es that its calibration
measurements are traceable to the United States National Institute of Standards and
Technology, to the extent allowed by the Institution's calibration facility, or to the calibration
facilities of other International Standards Organization members.
Warranty
This Hewlett-Packard instrument product is warranted against defects in material and
workmanship for a period of one year from the date of shipment, except that in the case of
certain components listed in General Information of this manual, the warranty shall be for the
speci ed period. During the warranty period, Hewlett-Packard Company will, at its option,
either repair or replace products that prove to be defective.
For warranty service or repair, this product must be returned to a service facility designated by
HP. Buyer shall prepay shipping charges to HP and HP shall pay shipping charges to return the
product to Buyer. However, Buyer shall pay all shipping charges, duties, and taxes for products
returned to HP from another country.
HP warrants that its software and rmware designated by HP for use with an instrument will
execute its programming instruction when property installed on that instrument. HP does not
warrant that the operation of the instrument, or software, or rmware will be uninterrupted or
error free.
Limitation Of Warranty
The foregoing warranty shall not apply to defects resulting from improper or inadequate
maintenance by Buyer, Buyer-supplied software or interfacing, unauthorized modi cation or
misuse, operation outside the environmental speci cations for the product, or improper site
preparation or maintenance.
No other warranty is expressed or implied. HP speci cally disclaims the implied warranties
of merchantability and tness for a particular purpose.
vii
Exclusive Remedies
The remedies provided herein are buyer's sole and exclusive remedies. HP shall not be liable
for any direct, indirect, special, incidental, or consequential damages, whether based on
contract, tort, or any other legal theory.
Assistance
Product maintenance agreements and other customer assistance agreements are available for
Hewlett-Packard products.
For any assistance, contact your nearest Hewlett-Packard Sales and Service Oce. Addresses
are provided at the back of this manual.
viii
Safety Symbols
General de nitions of safety symbols used on equipment or in manuals are listed below.
Instruction manual symbol: the product is marked with this symbol when it is
necessary for the user to refer to the instruction manual.
Alternating current.
Direct current.
On (Supply).
O (Supply).
This Warning sign denotes a hazard. It calls attention to a procedure, practice,
condition or the like, which, if not correctly performed or adhered to, could
result in injury or death to personnel.
This Caution sign denotes a hazard. It calls attention to a procedure, practice,
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.
Note denotes important information. It calls attention to a procedure,
practice, condition or the like, which is essential to highlight.
ix
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, HP Instrument
BASIC Programming Techniques , HP Instrument BASIC Interface Techniques , and HP
Instrument BASIC Language Reference.
HP Instrument BASIC Users Handbook Supplement (Option 1C2 Only), (HP Part Number
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.
x
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 . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-1
Calibration Cycle . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-1
Performance Test Record . . . . . . . . . . . . . . . . . . . . . . . . . . 2-1
Recommended Test Equipment . . . . . . . . . . . . . . . . . . . . . . . 2-2
FREQUENCY ACCURACY TEST . . . . . . . . . . . . . . . . . . . . . . . . 2-3
Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-3
Test Equipment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-3
Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-3
OSC LEVEL ACCURACY TEST . . . . . . . . . . . . . . . . . . . . . . . . 2-5
Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-5
Test Equipment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-5
Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-5
MEASUREMENT ACCURACY TEST . . . . . . . . . . . . . . . . . . . . . . 2-7
Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-7
Test Equipment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-7
Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-7
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 . . . . . . . . . . . . . . . . . . . . . . . 2-10
10 cm Airline with Short Test . . . . . . . . . . . . . . . . . . . . . . . 2-12
PERFORMANCE TEST RECORD . . . . . . . . . . . . . . . . . . . . . . . 2-13
Frequency Accuracy Test . . . . . . . . . . . . . . . . . . . . . . . . . . 2-13
Osc Level Accuracy Test . . . . . . . . . . . . . . . . . . . . . . . . . . 2-13
1 m Test Head (Standard / Option 031) . . . . . . . . . . . . . . . . . . 2-13
3 m Test Head (Option 022/032) . . . . . . . . . . . . . . . . . . . . . . 2-13
Measurement Accuracy Test . . . . . . . . . . . . . . . . . . . . . . . . 2-14
(1) Impedance Measurement Accuracy Test . . . . . . . . . . . . . . . . 2-14
(2) DC Resistance Measurement Accuracy Test . . . . . . . . . . . . . . . 2-22
Contents-1
3. Adjustments and Correction Constants
INTRODUCTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-1
SAFETY CONSIDERATIONS . . . . . . . . . . . . . . . . . . . . . . . . . 3-1
REQUIRED EQUIPMENT . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-2
WARM-UP FOR ADJUSTMENTS AND CORRECTION CONSTANTS . . . . . . . . 3-2
INSTRUMENT COVER REMOVAL . . . . . . . . . . . . . . . . . . . . . . . 3-2
ORDER OF ADJUSTMENTS . . . . . . . . . . . . . . . . . . . . . . . . . . 3-2
ADJUSTMENT PROGRAM . . . . . . . . . . . . . . . . . . . . . . . . . . 3-3
Keyboard and Mouse Operation . . . . . . . . . . . . . . . . . . . . . . . 3-3
Controller Requirement . . . . . . . . . . . . . . . . . . . . . . . . . . 3-4
Preparation for Using the Adjustment Program . . . . . . . . . . . . . . . 3-5
40 MHz REFERENCE OSCILLATOR FREQUENCY ADJUSTMENT . . . . . . . . 3-6
Required Equipment . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-6
Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-6
520 MHz LEVEL ADJUSTMENT . . . . . . . . . . . . . . . . . . . . . . . 3-8
Required Equipment . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-8
Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-8
COMB GENERATOR ADJUSTMENT . . . . . . . . . . . . . . . . . . . . . . 3-10
Required Equipment . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-10
Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-10
SECOND LOCAL PLL LOCK ADJUSTMENT . . . . . . . . . . . . . . . . . . 3-13
Required Equipment . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-13
Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-13
SOURCE VCXO ADJUSTMENT . . . . . . . . . . . . . . . . . . . . . . . . 3-15
Required Equipment . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-15
Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-15
THIRD LOCAL VCXO ADJUSTMENT . . . . . . . . . . . . . . . . . . . . . 3-16
Required Equipment . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-16
Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-16
SOURCE MIXER LOCAL LEAKAGE ADJUSTMENT . . . . . . . . . . . . . . . 3-17
Required Equipment . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-17
Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-17
OSC LEVEL CORRECTION CONSTANTS . . . . . . . . . . . . . . . . . . . . 3-19
Required Equipment . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-19
Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-19
HOLD STEP ADJUSTMENT . . . . . . . . . . . . . . . . . . . . . . . . . . 3-21
Required Equipment . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-21
Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-21
BAND PASS FILTER ADJUSTMENT . . . . . . . . . . . . . . . . . . . . . . 3-22
Required Equipment . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-22
Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-22
Display Adjustment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-24
Test Equipment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-24
Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-24
4. Overall Troubleshooting
TROUBLESHOOTING SUMMARY . . . . . . . . . . . . . . . . . . . . . . . 4-2
INSPECTING THE POWER ON SEQUENCE . . . . . . . . . . . . . . . . . . 4-4
Check the Fan . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-4
Check the Power On State . . . . . . . . . . . . . . . . . . . . . . . . . 4-4
Check Error Message . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-4
Troubleshooting When Power On Self-Test Failed . . . . . . . . . . . . . 4-5
A2 POST REGULATOR Test Fail . . . . . . . . . . . . . . . . . . . . . . 4-6
VERIFYING FUNCTIONAL GROUPS . . . . . . . . . . . . . . . . . . . . . . 4-6
Source Veri cation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-6
Contents-2
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 . . . . . . . . . . . . . . . . . . . 5-4
START HERE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-5
1. Check Error Messages . . . . . . . . . . . . . . . . . . . . . . . . . . 5-5
2. Check the Fan is Rotating . . . . . . . . . . . . . . . . . . . . . . . . 5-5
3. Check the A40 SHUTDOWN LED . . . . . . . . . . . . . . . . . . . . . 5-5
A40 Shutdown LED . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-6
4. Check the A1 +5 VD LED . . . . . . . . . . . . . . . . . . . . . . . . 5-7
Measure the A1 +5 VD Voltage . . . . . . . . . . . . . . . . . . . . . . 5-7
5. Check the A2 Eight LEDs . . . . . . . . . . . . . . . . . . . . . . . . 5-7
6. Run the Internal Test 4: A2 POST REGULATOR . . . . . . . . . . . . . . 5-8
FIND OUT WHY THE FAN IS NOT ROTATING . . . . . . . . . . . . . . . . . 5-10
1. Check the Line Voltage, Selector Switch Setting, and Fuse . . . . . . . . . 5-10
2. Check the A40 SHUTDOWN LED . . . . . . . . . . . . . . . . . . . . . 5-10
FIND OUT WHY THE A40 SHUTDOWN LED IS ON . . . . . . . . . . . . . . . 5-11
1. Disconnect the Cable from the A40J1 . . . . . . . . . . . . . . . . . . 5-11
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 . . . . . . . . . . . . . . . . . . . . 5-13
3. Remove Assemblies . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-14
TROUBLESHOOT THE FAN AND THE A40 PRE-REGULATOR . . . . . . . . . 5-15
1. Troubleshoot the Fan . . . . . . . . . . . . . . . . . . . . . . . . . . 5-15
2. Troubleshoot the A40 Pre-Regulator . . . . . . . . . . . . . . . . . . . 5-16
TROUBLESHOOT THE A2 POST-REGULATOR . . . . . . . . . . . . . . . . . 5-18
1. Check the A40 Pre-Regulator . . . . . . . . . . . . . . . . . . . . . . 5-18
2. Remove Assemblies . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-18
3. Measure the A2 Post Regulator Output Voltages . . . . . . . . . . . . . . 5-19
TROUBLESHOOT THE A52 DC-DC CONVERTER . . . . . . . . . . . . . . . . 5-21
Contents-3
6. Digital Control Troubleshooting
INTRODUCTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-1
DIGITAL CONTROL TROUBLESHOOTING SUMMARY . . . . . . . . . . . . . . 6-3
Start Here . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-3
Troubleshoot the A51 GSP . . . . . . . . . . . . . . . . . . . . . . . . . 6-3
START HERE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-4
1. Check the Power On Sequence . . . . . . . . . . . . . . . . . . . . . . 6-4
Check the Eight A1 LEDs . . . . . . . . . . . . . . . . . . . . . . . . 6-4
2. Check Error Messages . . . . . . . . . . . . . . . . . . . . . . . . . . 6-5
Identify the First Failed Test . . . . . . . . . . . . . . . . . . . . . . . 6-6
3. Check the A1 DRAM and Flash Memory . . . . . . . . . . . . . . . . . 6-6
4. Check the A1 Volatile Memory . . . . . . . . . . . . . . . . . . . . . . 6-7
5. Check the A30 Front Keyboard . . . . . . . . . . . . . . . . . . . . . 6-8
6. Check the A33 Handler Interface / Backup SRAM . . . . . . . . . . . . . 6-8
Check the Backup SRAM . . . . . . . . . . . . . . . . . . . . . . . . . 6-8
Check the Handler Interface Function . . . . . . . . . . . . . . . . . . 6-8
7. Check the Flexible Disk Drive . . . . . . . . . . . . . . . . . . . . . . 6-9
8. Check the A32 I-BASIC Interface and the HP-HIL Keyboard (Option 1C2) . . 6-9
TROUBLESHOOT THE A51 GSP . . . . . . . . . . . . . . . . . . . . . . . 6-10
1. Run Internal Test 3: A51 GSP . . . . . . . . . . . . . . . . . . . . . . 6-10
2. Check Two LEDs on A51 GSP . . . . . . . . . . . . . . . . . . . . . . 6-10
7. Source Group Troubleshooting
INTRODUCTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-1
SOURCE GROUP TROUBLESHOOTING SUMMARY . . . . . . . . . . . . . . . 7-3
Start Here . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-3
Check A5 Synthesizer Outputs . . . . . . . . . . . . . . . . . . . . . . . 7-3
Check A4A1 1st LO Outputs . . . . . . . . . . . . . . . . . . . . . . . . 7-3
Check an A3A1 Source Vernier Output . . . . . . . . . . . . . . . . . . . 7-3
Check A3A2 2nd LO Outputs . . . . . . . . . . . . . . . . . . . . . . . . 7-3
Check A3A3 Source Output . . . . . . . . . . . . . . . . . . . . . . . . 7-3
Check A7 Output Attenuator Control Signals . . . . . . . . . . . . . . . . 7-3
START HERE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-4
CHECK A5 SYNTHESIZER OUTPUTS . . . . . . . . . . . . . . . . . . . . . 7-5
1. Check the INT REF Signal . . . . . . . . . . . . . . . . . . . . . . . . 7-5
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 . . . . . . . . . . . . . . . . . 7-15
CHECK A3A1 SOURCE VERNIER OUTPUT . . . . . . . . . . . . . . . . . . 7-17
1. Check the 21.42 MHz Signal . . . . . . . . . . . . . . . . . . . . . . . 7-17
CHECK A3A2 2ND LO OUTPUTS . . . . . . . . . . . . . . . . . . . . . . . 7-19
1. Check the 2nd Local Oscillator Signal . . . . . . . . . . . . . . . . . . 7-19
2. Check the 2.05858 GHz Signal . . . . . . . . . . . . . . . . . . . . . . 7-20
CHECK A3A3 SOURCE OUTPUT . . . . . . . . . . . . . . . . . . . . . . . 7-23
1. Check the A3A3 RF Signal . . . . . . . . . . . . . . . . . . . . . . . . 7-23
CHECK A7 OUTPUT ATTENUATOR CONTROL SIGNALS . . . . . . . . . . . . 7-25
1. Check A7 Control Signals . . . . . . . . . . . . . . . . . . . . . . . . 7-25
Contents-4
8. Receiver Group Troubleshooting
INTRODUCTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-1
RECEIVER GROUP TROUBLESHOOTING SUMMARY . . . . . . . . . . . . . . 8-3
START HERE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-4
Test Equipment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-4
Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-4
FRONT ISOL'N Test Failure Troubleshooting . . . . . . . . . . . . . . . . 8-5
9. Test Head Troubleshooting
INTRODUCTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9-1
TEST HEAD TROUBLESHOOTING . . . . . . . . . . . . . . . . . . . . . . 9-3
Performing the Test Head Diagnostic Test . . . . . . . . . . . . . . . . . . 9-3
When the Signal Voltage Test Fails . . . . . . . . . . . . . . . . . . . . . 9-5
When the DC Voltage Test Fails . . . . . . . . . . . . . . . . . . . . . . . 9-6
Check the A43 DC Voltage Source . . . . . . . . . . . . . . . . . . . . 9-6
Check the DC Voltage Measurement Value . . . . . . . . . . . . . . . . . 9-6
10. Service Key Menus
INTRODUCTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-1
SERVICE MENU . . . . . . . . . . . . . . .
NNNNNNNNNNNNNNNNN
. . . . . . . . . . . . . . . . 10-3
TESTS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-3
NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN
SERVICE MODES (:DIAG:SERV:MODE {ON|1}) . . . . . . . . . . . . . . . . 10-3
NNNNNNNNNNNNNNNNNNNNNNN
READ ID . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-3
NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN
FIRMWARE REVISION (:DIAG:FREV?) . . . . . . . . . . . . . . . . . . . . 10-4
TESTS MENU . . . . . . . . . . . . . . . .
NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN
. . . . . . . . . . . . . . . . 10-5
EXECUTE TEST (:DIAG:TEST:EXEC) . . . . . . . . . . . . . . . . . . . . . 10-5
NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN
INTERNAL TESTS (:DIAG:TEST 0) . . . . . . . . . . . . . . . . . . . . . 10-5
NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN
EXTERNAL TESTS (:DIAG:TEST 16) . . . . . . . . . . . . . . . . . . . . . 10-6
NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN
ADJUSTMENT TESTS (:DIAG:TEST 26) . . . . . . . . . . . . . . . . . . . . 10-6
NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN
DISPLAY TESTS (:DIAG:TEST 32) . . . . . . . . . . . . . . . . . . . . . 10-6
Test Status . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-6
Diagnostic Tests . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-7
Test Descriptions . . . . . . . . . . . . . .
NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN
. . . . . . . . . . . . . . . . 10-8
INTERNAL TESTS . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-8
0: ALL INT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-8
1: A1 CPU . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-8
2: A1 VOLATILE MEMORY . . . . . . . . . . . . . . . . . . . . . . . . 10-8
3: A51 GSP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-9
4: A2 POST REGULATOR . . . . . . . . . . . . . . . . . . . . . . . . 10-9
5: A6 A/D CONVERTER . . . . . . . . . . . . . . . . . . . . . . . . . 10-9
6: A5 REFERENCE OSC . . . . . . . . . . . . . . . . . . . . . . . . . 10-9
7: A5 FRACTIONAL N OSC . . . . . . . . . . . . . . . . . . . . . . . . 10-9
8: A4A1 1ST LO OSC . . . . . . . . . . . . . . . . . . . . . . . . . . 10-9
9: A3A2 2ND LO OSC . . . . . . . . . . . . . . . . . . . . . . . . . . 10-10
10: A3A1 DIVIDER . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-10
11: A6 3RD LO OSC . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-10
12: A3A1 SOURCE OSC . . . . . . . . . . . . . . . . . . . . . . . . . 10-10
13: A6 SEQUENCER . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-10
14: SOURCE LEVEL . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-10
15: A33 MEMORY DISK . . . . . . . . .
NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN
. . . . . . . . . . . . . . . . 10-10
EXTERNAL TESTS . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-10
16: FRONT PANEL DIAG. . . . . . . . . . . . . . . . . . . . . . . . . 10-10
Contents-5
17: DSK DR FAULT ISOL'N . . . . . . . . . . . . . . . . . . . . . . . . 10-10
18: SOURCE FLATTNESS . . . . . . . . . . . . . . . . . . . . . . . . 10-11
19: OUTPUT ATTENUATOR . . . . . . . . . . . . . . . . . . . . . . . 10-11
20: RECEIVER GAIN . . . . . . . . . . . . . . . . . . . . . . . . . . 10-11
21: A6 GAIN . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-11
22: A6 V/I NORMALIZER . . . . . . . . . . . . . . . . . . . . . . . . 10-11
23: FRONT ISOL'N . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-11
24: TEST HEAD . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-11
25: A33 HANDLER INTERFACE . . . . . . . . . . . .
NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN
. . . . . . . . . 10-12
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 . . . . . . . . . . . .
NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN
. . . . . . . . . 10-13
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 . . . . . . . . . . . . . . . . . . . . . . . . . . 10-13
36: TEST PATTERN 5 . . . . . . . . . . . . . . . . . . . . . . . . . . 10-13
SERVICE MODES MENU . . . . . . . . . . . . . . . . . .
NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN
. . . . . . . . . 10-14
BUS MEAS [OFF] . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-14
NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN
CORRECTION CONSTANTS . . . . . . . . . . . . . . . . . . . . . . . . . . 10-14
NNNNNNNNNNNNNNNNN
SYNTH . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-14
NNNNNNNNNNN
OSC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-14
NNNNNNNNNNN
TRD . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-15
NNNNNNNN
IF . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-15
Service Modes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-15
BUS MEASUREMENT MENU . . . . . . . . . . . . . . . .
NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN
. . . . . . . . . 10-16
BUS MEAS on OFF (:DIAG:SERV:BUS:STAT {ON|OFF}) . . . . . . . . . . . . 10-16
NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN
DC BUS [OFF] (:DIAG:SERV:BUS:DC ) . . . . . . . . . . . . . 10-16
NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN
FREQ BUS [OFF] (:DIAG:SERV:BUS:FREQ ) . . . . . . . . . . . 10-16
NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN
AZ SWITCH on OFF (:DIAG:SERV:BUS:AZER {OFF|ON|0|1} ) . . . . . . . . . 10-17
NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN
WAIT COUNT (:DIAG:SERV:BUS:WAIT ) . . . . . . . . . . . . . 10-17
Bus Measurement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-17
Bus Measurement Procedure . . . . . . . . . . . . . . . . . . . . . . . . 10-17
Bus Measurement Values . . . . . . . . . . . . . . . . . . . . . . . . . . 10-18
DC Bus Node Descriptions . . . . . . . . . . . . . . . . . . . . . . . . . 10-18
0: OFF . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-18
1: +5 V (AUX) (2.025 U) . . . . . . . . . . . . . . . . . . . . . . . . . 10-18
2: 015 V (01.92 U) . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-18
3: 012.6 V (02.124 U) . . . . . . . . . . . . . . . . . . . . . . . . . . 10-18
4: 05 V (02.025 U) . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-18
5: +5 V (2.025 U) . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-18
6: +5.3 V (2.1465 U) . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-18
7: +8.5 V (1.8955 U) . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-18
8: +15 V (AUX) (1.92 U) . . . . . . . . . . . . . . . . . . . . . . . . . 10-19
9: +15 V (1.92 U) . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-19
10: +22 V (2.002 U) . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-19
Contents-6
11: FAN POWER . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-19
12: +65 V (2.0605 U) . . . . . . . . . . . . . . . . . . . . . . . . . . 10-19
13: SRC VTUNE (Source Oscillator VCO Tuning Voltage) . . . . . . . . . . 10-19
14: 2ND LO VTUNE (Second Local Oscillator VCO Tuning Voltage) . . . . . 10-19
15: DET OUT (Detector Output) . . . . . . . . . . . . . . . . . . . . . 10-19
16: SRC LO LEVEL . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-19
17: DAC OUT (Level DAC Output Voltage) . . . . . . . . . . . . . . . . . 10-19
18: 1ST LO VTUNE (First Local Oscillator VCO Turning Voltage) . . . . . . 10-19
19: (Not Available) . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-20
20: FN VTUNE (Fractional N Oscillator VCO Turning Voltage) . . . . . . . 10-20
21: FN INTEG OUT (Fractional N Oscillator Integrator Output Voltage) . . . 10-20
22: REF VTUNE (Reference Oscillator VCO Tuning Voltage) . . . . . . . . 10-20
23: 3RD LO VTUNE (Third Local Oscillator VCO Tuning Voltage) . . . . . . 10-20
24: 3RD LO LEVEL . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-20
25: AD VREF (A/D Converter Voltage Reference) . . . . . . . . . . . . . 10-20
26: RDC VOLTAGE . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-20
27: (Not Available) . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-20
28: (Not Available) . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-20
29: GND . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-20
Frequency Bus Node Descriptions . . . . . . . . . . . . . . . . . . . . . . 10-20
0: OFF . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-20
1: SOURCE OSC (Source Oscillator) . . . . . . . . . . . . . . . . . . . . 10-21
2: DIVIDER OUT (Divider Output) . . . . . . . . . . . . . . . . . . . . 10-21
3: (Not Available) . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-21
4: FN OSC (Fractional N Oscillator) . . . . . . . . . . . . . . . . . . . . 10-21
5: REF OSC (Reference Oscillator) . . . . . . . . . . . . . . . . . . . . 10-21
6: 3RD LO OSC (Third Local Oscillator) . . . . . . . . . . . . . . . . . . 10-21
7: SAMPLE HOLD . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-21
CORRECTION CONSTANTS MENU . . . . . . . . . . . . . . . . . . .
NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN
. . . 10-22
OSC LVL CC [ ] (:DIAG:SERV:CCON:OLEV {NORM|FRON|OFF}) . . . . . . . . 10-22
Correction Constants . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-23
SYNTHESIZER CONTROL MENU . . . . . . . . . . . . . . . . . . . .
NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN
. . . 10-24
FREQUENCY OFFSET . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-24
OSC CONTROL MENU . . . . . . . . . . . . . . . . . . . . . . . . .
NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN
. . . 10-25
OSC AUTO man (:DIAG:SERV:SOUR:MODE {AUTO|MAN}) . . . . . . . . . . . . 10-25
NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN
OUTPUT ATT [ ] (:DIAG:SERV:SOUR:ATT
{AUTO|DB0|DB10|DB20|DB30|DB40|DB50|DB60}) . . . . . . . . . .
NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN
. . . 10-25
OSC DAC AUTO man (:DIAG:SERV:SOUR:LEV:DAC:MODE {AUTO|MAN}) . . . . . 10-26
NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN
OSC DAC VALUE (:DIAG:SERV:SOUR:LEV:DAC:VAL ) . . . . . . . 10-26
NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN
OSC OUT ON off (:DIAG:SERV:SOUR:STAT {OFF|ON|0|1}) . . . . . . . . . 10-26
TRANSDUCER CONTROL MENU . . . . . . . . . . . . . . . . . . . .
NNNNNNNNNNNNNNNNNNNNNNNNNN
. . . 10-27
MEAS [ ] (:DIAG:SERV:TRAN:SENS:FUNC {IMP|VOLT|CURR|VIR} ) . . . . . . 10-27
IF CONTROL MENU . . . . . . . . . . . . . . . . . . . . . . . . . .
NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN
. . . 10-28
IF GAIN AUTO man (:DIAG:SERV:IF:GAIN:MODE {AUTO|MAN}) . . . . . . . . 10-29
NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN
GAIN XV [ ] (:DIAG:SERV:IF:GAIN:X:XV {DB0|DB6|DB12}) . . . . . . . . 10-29
NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN
GAIN XI [ ] (:DIAG:SERV:IF:GAIN:X:XI {DB0|DB6|DB12}) . . . . . . . . 10-29
NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN
GAIN Y [ ] (:DIAG:SERV:IF:GAIN:Y {DB0|DB6|DB12|DB18}) . . . . . . . . 10-29
NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN
GAIN Z [ ] (:DIAG:SERV:IF:GAIN:Z {DB0|DB2|DB4|DB18}) . . . . . . . . 10-29
NNNNNNNNNNNNNNNNN
IF BW . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-30
BOOTLOADER MENU . . . . . . . . . . . . . . . . . . . . . . . . .
NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN
. . . 10-31
SYSTEM UPDATE] . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-31
Contents-7
NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN
SYSTEM BACKUP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-31
NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN
PREVIEW DISK . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-32
NNNNNNNNNNNNNNNNNNNN
REBOOT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 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 . . . . . . . . . . . . . . . . . . . . . . . 11-9
A1 CPU . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11-11
A30 Front-Panel Keyboard . . . . . . . . . . . . . . . . . . . . . . . . . 11-11
A31 Interface Connector . . . . . . . . . . . . . . . . . . . . . . . . . . 11-11
A32 I-BASIC Interface (Only for Option 1C2) . . . . . . . . . . . . . . . . . 11-11
A33 Handler Interface / Backup SRAM . . . . . . . . . . . . . . . . . . . 11-12
A51 GSP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11-12
CRT Display . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11-12
Flexible Disk Drive . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11-12
SOURCE THEORY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11-13
A5 Synthesizer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11-15
REF OSC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11-15
FRAC N OSC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11-15
STEP OSC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11-16
Multiplier (X 13) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11-16
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 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11-17
Level Vernier . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11-17
A3A2 2nd LO . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11-17
2nd LO . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11-17
Source First Mixer . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11-18
A3A3 Source . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11-18
A7 Output Attenuator . . . . . . . . . . . . . . . . . . . . . . . . . . . 11-18
RECEIVER THEORY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11-19
A4A2 Receiver RF . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11-21
A6 Receiver IF . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11-21
Third Local Oscillator . . . . . . . . . . . . . . . . . . . . . . . . . . 11-21
Third Converter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11-21
Sample/Hold and A/D Converter . . . . . . . . . . . . . . . . . . . . . 11-22
Gains X, Y, and Z . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11-22
TEST HEAD THEORY . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11-23
Contents-8
Transducer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11-25
V/I Multiplexer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11-25
A43 Head Control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11-25
DC Resistance Measurement . . . . . . . . . . . . . . . . . . . . . . . 11-25
12. Replaceable Parts
INTRODUCTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12-1
ORDERING INFORMATION . . . . . . . . . . . . . . . . . . . . . . . . . . 12-1
Direct Mail Order System . . . . . . . . . . . . . . . . . . . . . . . . . . 12-1
EXCHANGE ASSEMBLIES . . . . . . . . . . . . . . . . . . . . . . . . . . 12-2
REPLACEABLE PARTS LIST . . . . . . . . . . . . . . . . . . . . . . . . . 12-2
Top View Assemblies . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12-4
Bottom View Assemblies . . . . . . . . . . . . . . . . . . . . . . . . . . 12-12
Front Assembly Parts . . . . . . . . . . . . . . . . . . . . . . . . . . . 12-19
Rear Assembly Parts . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12-22
CRT Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12-26
Test Head Parts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12-28
Miscellaneous Parts . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12-30
13. Replacement Procedures
INTRODUCTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13-1
TOP COVER REMOVAL . . . . . . . . . . . . . . . . . .