HP 70900B series User manual

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Service Guide
HP 70900B
Local Oscillator Source
ABCDE
HP Part No. 70900-90293
Printed in USA June 1995
Edition A.0.0

Notice
The information contained in this document is subject to change without notice.
Hewlett-Packard makes no warranty of any kind with regard to this material, including,
but not limited to, the implied warranties of merchantability and tness for a particular
purpose. Hewlett-Packard shall not be liable for errors contained herein or for incidental or
consequential damages in connection with the furnishing, performance, or use of this material.
Restricted Rights Legend.
Use, duplication, or disclosure by the U.S. Government is subject to restrictions as set forth
in subparagraph (c) (1) (ii) of the Rights in Technical Data and Computer Software clause at
DFARS 252.227-7013 for DOD agencies, and subparagraphs (c) (1) and (c) (2) of the Commercial
Computer Software Restricted Rights clause at FAR 52.227-19 for other agencies.
c
 Copyright Hewlett-Packard Company 1989, 1990, 1995
All Rights Reserved. Reproduction, adaptation, or translation without prior written permission
is prohibited, except as allowed under the copyright laws
.
1400 Fountaingrove Parkway, Santa Rosa, CA 95403-1799, USA

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 Institute's calibration facility, and 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 date of shipment. During the warranty period,
Hewlett-Packard Company will, at its option, either repair or replace products which prove to
be defective.
For warranty service or repair, this product must be returned to a service facility designated by
Hewlett-Packard. Buyer shall prepay shipping charges to Hewlett-Packard and Hewlett-Packard
shall pay shipping charges to return the product to Buyer. However, Buyer shall pay all
shipping charges, duties, and taxes for products returned to Hewlett-Packard from another
country.
Hewlett-Packard warrants that its software and rmware designated by Hewlett-P
ackard for
use with an instrument will execute its programming instructions when properly installed on
that instrument. Hewlett-Packard 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 of the environmental specications for the product, or improper
site preparation or maintenance.
NO OTHER WARRANTY IS EXPRESSED OR IMPLIED. HEWLETT-PACKARD SPECIFICALLY
DISCLAIMS THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
PARTICULAR PURPOSE.
Exclusive Remedies
THE REMEDIES PROVIDED HEREIN ARE BUYER'S SOLE AND EXCLUSIVE REMEDIES.
HEWLETT-PACKARD 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.
iii

Safety Symbols
The following safety symbols are used throughout this manual. Familiarize yourself with each
of the symbols and its meaning before operating this instrument.
CAUTION
The CAUTION sign denotes a hazard. It calls attention to a procedure which, if
not correctly performed or adhered to, could result in damage to or destruction
of the product or the user's work. Do not proceed beyond a CAUTION sign
until the indicated conditions are fully understood and met.
WARNING
The WARNING sign denotes a hazard. It calls attention to a procedure
which, if not correctly performed or adhered to, could result in injury
to the user. Do not proceed beyond a WARNING sign until the indicated
conditions are fully understood and met.
DANGER
The DANGER sign denotes an imminent hazard to people. It warns the
reader of a procedure which, if not correctly performed or adhered to,
could result in injury or loss of life. Do not proceed beyond a DANGER
sign until the indicated conditions are fully understood and met.
iv

General Safety Considerations
WARNING
The instructions in this document are for use by qualied personnel
only.To avoid electrical shock, do not perform any servicing unless you
are qualied to do so.
The opening of covers or removal of parts is likely to expose dangerous
voltages. Disconnect the instrument from all voltage sources while it is
being opened.
The power cord is connected to internal capacitors that may remain live
for ve seconds after disconnecting the plug from its power supply.
This is a Safety Class 1 Product (provided with a protective earthing
ground incorporated in the power cord). The mains plug shall only be
inserted in a socket outlet provided with a protective earth contact.
Any interruption of the protective conductor inside or outside of the
instrument is likely to make the instrument dangerous. Intentional
interruption is prohibited.
For continued protection against re hazard, replace fuse only with
same type and ratings, (type nA/nV). The use of other fuses or materials
is prohibited.
WARNING
Before this instrument is switched on, make sure it has been properly
grounded through the protective conductor of the ac power cable to a
socket outlet provided with protective earth contact.
Any interruption of the protective (grounding) conductor, inside
or outside the instrument, or disconnection of the protective earth
terminal can result in personal injury.
Before this instrument is switched on, make sure its primary power
circuitry has been adapted to the voltage of the ac power source
.
Failure to set the ac power input to the correct voltage could cause
damage to the instrument when the ac power cable is plugged in.
v

Servicing at a Glance
vi

The local oscillator source is a module that is used in HP 70000 Series modular measurement
systems. A standard modular spectrum analyzer system includes a mainframe with an
RF section, IF section, local oscillator, an optional display, and an optional precision frequency
reference.
Software and documentation supplied This service guide is part of an Option OB3 package
which includes:
HP 70900B Service Guide
HP 70900B Component Level Information Packages
Module verication software disks.
Tools needed Before servicing, refer to Chapter 5 for a list of the tools and accessories that
may be needed during servicing.
Antistatic precautions Electrical components are easily damaged by small amounts of static
electricity. If possible, work at a static-safe work station. For further information, refer to
\Preparing a Static-Safe Work Station" in Chapter 4.
vii

In This Book
This book describes all of the service procedures necessary to test, adjust, calibrate,
troubleshoot, and repair your local oscillator source in an HP 70000 Series modular
measurement system.
Each module in the HP 70000 Series modular measurement system has its own service guide.
For further information related to the servicing of additional and alternate modules that can be
used in this system, refer to that module's service guide.
This service guide is part of an Option OB3 package which consists of two manuals.
Manual 1
Chapter 1 provides information to help get you started so that your local oscillator source is
serviced properly.
Chapter 2 contains information needed to use module verication software while servicing
your local oscillator source.
Chapter 3 contains information to help identify and resolve some common problems that may
occur with your local oscillator source before extensive servicing.
Chapter 4 contains information about troubleshooting your local oscillator source . It
presents information on preparing a static-safe work station and then it presents a set of
troubleshooting procedures that can be used to optimize repair time
.
Chapter 5 contains tables with a complete listing of all equipment that may be required for
servicing.
Chapter 6 contains the setups for all adjustment procedures that are used to optimize module
performance when assemblies are changed, repaired, or adjusted.
Chapter 7 contains the setups for all module verication tests that are used to optimize
module performance when assemblies are changed, repaired, or adjusted.
Chapter 8 contains the setups for all equipment calibration procedures that must be
performed in order to optimize module performance when assemblies are changed, repaired,
or adjusted.
Chapter 9 contains procedures for removal and replacement of major assemblies in your
local oscillator source. It also contains information needed to order mechanical parts for your
local oscillator source.
Chapter 10 contains information on all overall parts identication drawings that should be
used when performing the troubleshooting procedures descibed in this service guide.
An index is also added at the end of this service guide to aid the user in nding key items of
interest.
Manual 2
Manual 2 contains packets of component-level repair information for each
local oscillator source board assembly that has eld-replaceable parts. Each packet includes
the parts list, component-location drawing, and schematics for a specic board-assembly part
number. This manual also contains a table that can be used to cross reference dierent board
assemblies that have dierent serial prex breaks.
Before you begin servicing , you must become familiar with module verication software.For
information on how to use this module verication software
, refer to Chapter 2.
viii

Contents
1. Getting Started
What Is Servicing? . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-2
When Is Servicing Needed? . . . . . . . . . . . . . . . . . . . . . . . . . . 1-2
If You Want Hewlett-Packard to Service Your Local Oscillator Source .... .. 1-3
Determining Your Local Oscillator Source 's Serial Number .... .. .. .. 1-3
Returning Your Local Oscillator Source for Service . . . . . . . . . . . . . . 1-5
2. Module Verication Software
Computer Compatibility ........................... 2-2
Alternate Key Labels .... .. .. .. .. .. .. .. .. .. .. .. . 2-2
Computer Language Compatibility ..................... 2-2
Printer Compatibility . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-3
Conguring the Hardware .. .. .. .. .. .. .. .. .. .. .. .. .. 2-4
Installing Module Verication Software .................... 2-5
Module Verication Software Overview . . . . . . . . . . . . . . . . . . . . 2-7
Testing Multiple Modules . . . . . . . . . . . . . . . . . . . . . . . . . . 2-7
Error Messages or Warnings Dened .. .. .. .. .. .. .. . .. .. . 2-7
Final Tests Dened . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-7
Single Tests Dened .. .. .. .. .. .. .. .. .. . .. .. .. .. . 2-8
Printing Test Results . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-8
Menus ................................... 2-9
Menu Structure .............................. 2-9
Edit and Command Screen Menus . . . . . . . . . . . . . . . . . . . . . . 2-9
Edit Screen Menus . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-9
Command Screen Menus . . . . . . . . . . . . . . . . . . . . . . . . . 2-9
Cursor Keys and Menu Selections . . . . . . . . . . . . . . . . . . . . . 2-10
Main Menu ................................ 2-11
Mass Storage Menu ...... .. .. .. .. .. .. .. .. . .. .. . 2-11
Mass Storage Menu Edit Screen . . . . . . . . . . . . . . . . . . . . . . 2-12
Mass Storage Menu Command Screen . . . . . . . . . . . . . . . . . . . 2-12
Parameter Menu . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-12
Parameter Menu Edit Screen . . . . . . . . . . . . . . . . . . . . . . . 2-12
Parameter Menu Command Screen .... .. .. .. .. .. .. .. .. 2-13
Equipment Menu ............................. 2-13
Equipment Menu Edit Screen . . . . . . . . . . . . . . . . . . . . . . . 2-14
Equipment Menu Command Screen . . . . . . . . . . . . . . . . . . . . 2-14
Edit Calibration Data ...... .. .. .. .. .. .. . .. .. .. .. 2-15
Edit Calibration Data Edit Screen . . . . . . . . . . . . . . . . . . . . . 2-16
Edit Calibration Data Command Screen . . . . . . . . . . . . . . . . . . 2-16
HP-MSIB Address Menu .......................... 2-16
Test Menu . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-16
Test Menu Command Screen .... .. .. .. .. .. .. .. .. .. . 2-17
Error and Status Messages .......................... 2-23
Contents-1

3. Before Extensive Servicing
If the System's Power-On Self Test Fails . . . . . . . . . . . . . . . . . . . . 3-2
If Your HP 70900B Local Oscillator Source Is Powered On But Not Responding
Correctly ................................ 3-4
If the STATUS ERR Indicator LED on the HP 70900B Local Oscillator Source is
Flashing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-5
If More Than One Module's Error Indicator Is Flashing . . . . . . . . . . . . . 3-6
4. Troubleshooting
Preparing a Static-Safe Work Station .. .. .. .. .. .. .. .. .. .. . 4-2
Troubleshooting Flow Chart ......................... 4-4
If Operating Errors Messages (2000{2999) Occur . . . . . . . . . . . . . . . . 4-7
If Hardware Error Messages (7000{7999) Occur .. .. .. .. .. .. .. .. 4-8
If Series 8000 Error Messages (8000{8999) Occur . . . . . . . . . . . . . . . . 4-18
If Series 9000 Error Messages (9000{9999) Occur . . . . . . . . . . . . . . . . 4-19
A1A1 Host/Processor and A1A2 1/4 MB RAM/ROM Troubleshooting . . . . . . . 4-20
A3 Power Supply Troubleshooting ...................... 4-23
A4 Idler Phase-Lock Loop Troubleshooting .................. 4-25
A6 YTO Phase-Lock Loop/A8 Frequency Control Troubleshooting . . . . . . . . 4-31
A7 FRAC'N Synthesizer Troubleshooting ................... 4-37
If You Have Verication Test Failures ..................... 4-40
If You Have Adjustment Procedure Failures .. .. .. .. .. .. .. .. .. 4-47
Performing Related Adjustments and Verication Tests . . . . . . . . . . . . . 4-53
The State Worksheet . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-57
Overall Block Diagram of Local Oscillator Source ............... 4-59
5. Recommended Test Equipment Tables
300 MHz Up-Converter Construction Procedure .. .. .. .. .. .. .. .. 5-4
Snier Loop Construction Procedure .... .. .. .. .. .. .. .. .. . 5-9
Resistive Divider Construction Procedure .... .. .. .. .. .. .. .. . 5-10
6. Adjustment Procedures
Before You Begin .............................. 6-2
Types of Adjustments ...... .. .. .. .. .. .. .. .. . .. .. . 6-6
Adjustment 01. Video Processor .... .. .. .. .. .. .. .. .. .. . 6-8
Adjustment 02. 100 MHz Reference/300 MHz Bandpass Filter . . . . . . . . . . 6-11
Adjustment 03. 300 MHz Bandpass Filter .. .. .. .. .. .. .. .. .. . 6-15
Adjustment 04. Calibrator Output Frequency ................. 6-18
Adjustment 05. Calibrator Output Amplitude .... .. .. .. .. . .. .. 6-19
Adjustment 06. 300 MHz Reference Output Amplitude . . . . . . . . . . . . . 6-20
Adjustment 07. FFS VCO........................... 6-22
Adjustment 08. FFS Tune/Comp Coarse . . . . . . . . . . . . . . . . . . . . 6-24
Adjustment 09. FFS Reference Null . . . . . . . . . . . . . . . . . . . . . . 6-26
Adjustment 10. FFS API 1 .......................... 6-28
Adjustment 11. FFS API 2 .......................... 6-30
Adjustment 12. FFS API 3 .......................... 6-31
Adjustment 13. FFS Tune/Comp Fine . . . . . . . . . . . . . . . . . . . . . 6-32
Adjustment 14. FFS Spurious Responses ................... 6-34
Adjustment 15. Low Idler .......................... 6-36
Adjustment 16. Sweep Oset . . . . . . . . . . . . . . . . . . . . . . . . . 6-38
Adjustment 17. Frequency Control Voltage References . . . . . . . . . . . . . 6-40
Adjustment 18. YTO Frequency Endpoints .. .. .. .. .. .. .. .. .. 6-42
Adjustment 19. FM Gain . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-45
Adjustment 20. Sweep Overshoot . . . . . . . . . . . . . . . . . . . . . . . 6-47
Adjustment 21. Tune + Span Oset ..................... 6-49
Contents-2

Adjustment 22. Idler Buer ......................... 6-51
7. Module Verication Tests
Verication Tests . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-2
Recommended Test Equipment . . . . . . . . . . . . . . . . . . . . . . . . 7-3
Test 01. 300 MHz Reference Output Power and Harmonics . . . . . . . . . . . 7-4
Test 02. LO Output Power and Harmonics . . . . . . . . . . . . . . . . . . . 7-5
Test 03. Residual FM (Span > 10 MHz) . . . . . . . . . . . . . . . . . . . . . 7-6
Test 04. LO Output Spurious Response .................... 7-7
Test 05. LO Display Sidebands ........................ 7-9
Test 06. LO 40 kHz Sidebands .... .. .. .. .. .. .. .. .. .. .. 7-11
Test 07. Reference Oscillator Accuracy .................... 7-13
Test 08. Calibrator Amplitude Accuracy . . . . . . . . . . . . . . . . . . . . 7-15
Test 09. 300 MHz Reference Amplitude Accuracy .... .. .. .. .. .. . 7-16
Test 10. Video Detector Tracking . . . . . . . . . . . . . . . . . . . . . . . 7-17
Test 11. External Triggering ......................... 7-18
Test 12. Video Processor Noise . . . . . . . . . . . . . . . . . . . . . . . . 7-19
Test 13. LO Frequency and Span Accuracy (Span > 10 MHz) .......... 7-20
Test 14. LO Span Accuracy (Phase-Locked Spans) ............... 7-21
Test 15. LO Frequency Accuracy (Span  10 MHz) ............... 7-22
Test 16. LO Frequency Error versus Sweep Time ............... 7-23
Test 17. Tune + Span Output Accuracy ................... 7-24
Test 18. SWP Output Accuracy . . . . . . . . . . . . . . . . . . . . . . . . 7-25
Test 19. HSWP Output Voltage ........................ 7-26
Test 20. Line Triggering ........................... 7-27
Test 21. LED Check ............................. 7-29
Test 22. Video Bandwidth .......................... 7-30
Test 23. 300 MHz Reference 40 kHz Sidebands . . . . . . . . . . . . . . . . . 7-31
Test 24. Calibrator Harmonics ........................ 7-33
Test 25. Calibrator Output Impedance . . . . . . . . . . . . . . . . . . . . . 7-34
Test 26. 300 MHz Reference Isolation . . . . . . . . . . . . . . . . . . . . . 7-36
Test 27. External Reference ......................... 7-38
Test 28. Reference Oscillator Noise and Stability . . . . . . . . . . . . . . . . 7-40
Test 29. YTO Linearity . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-41
8. System Calibration
External Frequency Reference ........................ 8-2
Spectrum Analyzer/RF Cable Calibration .. .. .. .. .. .. .. .. .. . 8-6
9. Replacing Major Assemblies
A1A1 Host/Processor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9-3
A1A2 1/4 MB RAM/ROM ........................... 9-5
A2 Video Processor ............................. 9-6
A3 Power Supply .. .. .. .. .. .. .. .. .. .. .. . .. .. .. . 9-7
A4 Idler Phase-Lock Loop .. .. .. .. .. .. .. .. .. .. .. .. . . 9-9
A4A1 300 MHz Amplier . . . . . . . . . . . . . . . . . . . . . . . . . . . 9-11
A4A2 Idler Lock . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9-13
A6 YTO Phase-Lock Loop .......................... 9-15
A6A1 100 MHz Reference .... .. .. .. .. .. .. .. . .. .. .. . 9-18
A6A2 YTO Lock . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9-20
A6A3 Idler Buer .............................. 9-22
A6A4 YTO Lock Microcircuit . . . . . . . . . . . . . . . . . . . . . . . . . 9-23
A6A5 YTO ................................. 9-25
A7 FRAC'N Synthesizer for Serial #3219A01388 and Above . . . . . . . . . . . 9-27
A7 FRAC'N Synthesizer for Serial #3144A01387 and Below . . . . . . . . . . . 9-31
Contents-3

A8 Frequency Control ............................ 9-37
A9 Front Panel ............................... 9-38
10. Overall Parts Identication Drawings
Front View Identication . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-2
Rear View Identication .. .. .. .. .. .. .. .. .. .. .. .. .. . 10-4
Top View Identication . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-6
Bottom View Identication . . . . . . . . . . . . . . . . . . . . . . . . . . 10-15
Side View Identication ........................... 10-16
Side View Identication (A4 Idler Phase-Lock Loop) . . . . . . . . . . . . . . 10-18
Side View Identication (A6 YTO Phase-Lock Loop) .... .. .. .. .. .. 10-19
Side View Identication (A7 FRAC'N Synthesizer) ............... 10-21
Index
Contents-4

Figures
1-1. Typical Serial Number Label .. .. .. .. .. .. .. .. .. .. .. .. 1-3
2-1. Main Menu Softkeys . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-19
2-2. Mass Storage Menu and Parameter Menu Softkeys . . . . . . . . . . . . . . 2-20
2-3. Equipment Menu and HP-MSIB Map Screen Menu Softkeys . . . . . . . . . . 2-21
2-4. Test Menu Softkeys ............................ 2-22
3-1. Line Voltage Selector . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-2
3-2. Line Fuse Removal and Replacement .................... 3-2
4-1. Static-Safe Work Station .. .. .. .. .. .. .. .. .. .. .. .. .. 4-2
4-2. Troubleshooting Flow Chart ........................ 4-4
4-3. Block Diagram of A7 FRAC'N Synthesizer for Serial #3144A01387 and Below . 4-59
4-4. Overall Block Diagram of Local Oscillator Source .... .. .. .. .. .. 4-61
5-1. 300 MHz Up-Converter Block Diagram ................... 5-4
5-2. 300 MHz Up-Converter Assembly Diagram . . . . . . . . . . . . . . . . . . 5-6
5-3. Power Levels through RF Chain .. .. .. .. .. .. .. .. .. .. .. 5-7
5-4. Snier Loop Assembly Diagram . . . . . . . . . . . . . . . . . . . . . . . 5-9
5-5. Resistive Divider Schematic Diagram .................... 5-10
5-6. Resistive Divider Assembly Diagram .................... 5-10
6-1. Equipment Setup for Adjustment 01. Video Processor ............ 6-8
6-2. Locations for Adjustment 01. Video Processor . . . . . . . . . . . . . . . . 6-9
6-3. Equipment Setup for Adjustment 02. 100 MHz Reference/300 MHz Bandpass
Filter .... .. .. .. .. .. .. .. .. .. .. .. .. .. .. . 6-11
6-4. Locations for Adjustment 02. 100 MHz Reference/300 MHz Bandpass Filter .. 6-11
6-5. Placing A1A1 Host/Processor and A3 Power Supply on Extender Cables . . . . 6-12
6-6. Equipment Setup for Adjustment 03. 300 MHz Bandpass Filter . . . . . . . . 6-15
6-7. Locations for Adjustment 03. 300 MHz Bandpass Filter . . . . . . . . . . . . 6-15
6-8. Placing A1A1 Host/Processor and A2 Video Processor on Extender Cables . . . 6-16
6-9. Equipment Setup for Adjustment 04. Calibrator Output Frequency . . . . . . 6-18
6-10. Equipment Setup for Adjustment 05. Calibrator Output Amplitude . . . . . . 6-19
6-11. Equipment Setup for Adjustment 06. 300 MHz Reference Output Amplitude . 6-20
6-12. Locations for Adjustment 06. 300 MHz Reference Output Amplitude ..... 6-20
6-13. Equipment Setup for Adjustment 07. FFS VCO ............... 6-22
6-14. Locations for Adjustment 07. FFS VCO ................... 6-22
6-15. Equipment Setup for Adjustment 08. FFS Tune/Comp Coarse . . . . . . . . . 6-24
6-16. Locations for Adjustment 08. FFS Tune/Comp Coarse ............ 6-24
6-17. Equipment Setup for Adjustment 09. FFS Reference Null .. .. .. .. .. 6-26
6-18. Locations for Adjustment 09. FFS Reference Null .............. 6-26
6-19. Equipment Setup for Adjustment 10. FFS API 1 . . . . . . . . . . . . . . . 6-28
6-20. Locations for Adjustment 10. FFS API 1 (1 of 2) . . . . . . . . . . . . . . . 6-28
6-21. Locations for Adjustment 10. FFS API 1 (2 of 2) . . . . . . . . . . . . . . . 6-29
6-22. Equipment Setup for Adjustment 13. FFS Tune/Comp Fine . . . . . . . . . . 6-32
6-23. Equipment Setup for Adjustment 14. FFS Spurious Responses ........ 6-34
6-24. Equipment Setup for Adjustment 15. Low Idler ............... 6-36
6-25. Locations for Adjustment 15. Low Idler . . . . . . . . . . . . . . . . . . . 6-36
6-26. Equipment Setup for Adjustment 16. Sweep Oset .. .. .. .. .. .. . 6-38
6-27. Locations for Adjustment 16. Sweep Oset ................. 6-38
6-28. Equipment Setup for Adjustment 17. Frequency Control Voltage References . 6-40
Contents-5

6-29. Locations for Adjustment 17. Frequency Control Voltage References ..... 6-40
6-30. Equipment Setup for Adjustment 18. YTO Frequency Endpoints ....... 6-42
6-31. Locations for Adjustment 18. YTO Frequency Endpoints (1 of 2) ....... 6-42
6-32. Locations for Adjustment 18. YTO Frequency Endpoints (2 of 2) ....... 6-43
6-33. Equipment Setup for Adjustment 19. FM Gain . . . . . . . . . . . . . . . . 6-45
6-34. Locations for Adjustment 19. FM Gain ................... 6-45
6-35. Equipment Setup for Adjustment 20. Sweep Overshoot ........... 6-47
6-36. Locations for Adjustment 20. Sweep Overshoot .. .. .. .. .. .. . .. 6-47
6-37. Equipment Setup for Adjustment 21. Tune + Span Oset .... .. .. .. 6-49
6-38. Locations for Adjustment 21. Tune + Span Oset . . . . . . . . . . . . . . 6-49
6-39. Equipment Setup for Adjustment 22. Idler Buer .............. 6-51
6-40. Locations for Adjustment 22. Idler Buer . . . . . . . . . . . . . . . . . . 6-52
7-1. System Rear-Panel Connections . . . . . . . . . . . . . . . . . . . . . . . 7-3
7-2. 300 MHz Reference Output Power and Harmonics Test Setup . . . . . . . . . 7-4
7-3. LO Output Power and Harmonics Test Setup . . . . . . . . . . . . . . . . . 7-5
7-4. Residual FM (Span > 10 MHz) Test Setup . . . . . . . . . . . . . . . . . . . 7-6
7-5. LO Output Spurious Response Test Setup .................. 7-7
7-6. LO Display Sidebands Test Setup ...................... 7-9
7-7. LO 40 kHz Sidebands Test Setup .. .. .. .. .. .. .. .. .. .. .. 7-11
7-8. Reference Oscillator Accuracy Test Setup .................. 7-13
7-9. Calibrator Amplitude Accuracy Test Setup . . . . . . . . . . . . . . . . . . 7-15
7-10. 300 MHz Reference Amplitude Accuracy Test Setup ............. 7-16
7-11. Video Detector Tracking Test Setup . . . . . . . . . . . . . . . . . . . . . 7-17
7-12. External Triggering Test Setup ....................... 7-18
7-13. Test Setup for Test 12. Video Processor Noise .... .. .. .. .. .. .. 7-19
7-14. LO Frequency and Span Accuracy (Span > 10 MHz) Test Setup ........ 7-20
7-15. LO Span Accuracy (Phase-Locked Spans) Test Setup ............. 7-21
7-16. LO Frequency Accuracy (Span  10 MHz) Test Setup ............. 7-22
7-17. LO Frequency Error versus Sweep Time Test Setup .. .. .. .. .. . .. 7-23
7-18. Tune + Span Output Accuracy Test Setup . . . . . . . . . . . . . . . . . . 7-24
7-19. SWP Output Accuracy Test Setup . . . . . . . . . . . . . . . . . . . . . . 7-25
7-20. HSWP Output Voltage Test Setup ...................... 7-26
7-21. Line Triggering Test Setup ......................... 7-27
7-22. Test Setup for Test 21. LED Check .... .. .. .. .. .. .. .. .. . 7-29
7-23. Video Bandwidth Test Setup ........................ 7-30
7-24. 300 MHz Reference 40 kHz Sidebands Test Setup .............. 7-31
7-25. Calibrator Harmonics Test Setup ...................... 7-33
7-26. Calibrator Output Impedance Test Setup . . . . . . . . . . . . . . . . . . . 7-34
7-27. 300 MHz Reference Isolation Test Setup . . . . . . . . . . . . . . . . . . . 7-36
7-28. External Reference Test Setup .... .. .. .. .. .. .. .. .. . .. 7-38
7-29. Reference Oscillator Noise and Stability Test Setup . . . . . . . . . . . . . . 7-40
7-30. Test Setup for Test 29. YTO Linearity . . . . . . . . . . . . . . . . . . . . 7-41
8-1. Preferred Frequency Reference Connections ................ 8-3
8-2. Using an HP 70310A Precision Frequency Reference . . . . . . . . . . . . . 8-4
8-3. Using an HP 70310A Precision Frequency Reference and a House Standard .. 8-4
8-4. Using an HP 8566B Spectrum Analyzer and a House Standard ........ 8-5
8-5. Reference Calibration Test Setup ...................... 8-6
8-6. IF Calibration Test Setup . . . . . . . . . . . . . . . . . . . . . . . . . . 8-6
8-7. RF Calibration Test Setup ......................... 8-7
9-1. A1A1 Host/Processor Removal/Replacement . . . . . . . . . . . . . . . . . 9-4
9-2. A2 Video Processor Removal/Replacement . . . . . . . . . . . . . . . . . . 9-6
9-3. A3 Power Supply Removal/Replacement . . . . . . . . . . . . . . . . . . . 9-8
9-4. A4 Idler Phase-Lock Loop Removal/Replacement .............. 9-10
9-5. A4A1 300 MHz Amplier Removal/Replacement . . . . . . . . . . . . . . . 9-12
9-6. A4A2 Idler Lock and A4A3 Idler V
CO Microcircuit Removal/Replacement ... 9-14
Contents-6

9-7. A6 YTO Phase-Lock Loop Removal/Replacement (1 of 2) . . . . . . . . . . . 9-16
9-7. A6 YTO Phase-Lock Loop Removal/Replacement (2 of 2) . . . . . . . . . . . 9-17
9-8. A6A1 100 MHz Reference Removal/Replacement . . . . . . . . . . . . . . . 9-19
9-9. A6A2 YTO Lock Removal/Replacement .. .. .. .. .. .. .. .. .. . 9-21
9-10. A6A3 Idler Buer Removal/Replacement .................. 9-22
9-11. A6A4 YTO Lock Microcircuit Removal/Replacement .... .. .. .. .. . 9-24
9-12. A6A5 YTO Removal/Replacement . . . . . . . . . . . . . . . . . . . . . . 9-26
9-13. A7 FRAC'N Synthesizer Removal/Replacement for Serial #3219A01388 and
Above . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9-28
9-14. A7A1 FFS Phase Lock Loop Removal/Replacement for Serial #3219A01388 and
Above . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9-30
9-15. A7 FRAC'N Synthesizer Removal/Replacement for Serial #3144A01387 and
Below . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9-32
9-16. A7A1 FFS Phase Lock Loop Removal/Replacement for Serial #3144A01387 and
Below . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9-34
9-17. A7A2 FFS Analog Removal/Replacement for Serial #3144A01387 and Below . . 9-36
9-18. A8 Frequency Control Removal/Replacement ................ 9-37
9-19. A9 Front Panel Removal/Replacement . . . . . . . . . . . . . . . . . . . . 9-38
10-1. Overall Parts Identication Drawing, Front View (A9 Front Panel) ...... 10-2
10-2. Overall Parts Identication Drawing, Front View .............. 10-3
10-3. Overall Parts Identication Drawing, Front View (Panel Removed) ...... 10-3
10-4. Overall Parts Identication Drawing, Rear View (Rear-Frame) ........ 10-4
10-5. Overall Parts Identication Drawing, Rear Panel Connectors ......... 10-5
10-6. Overall Parts Identication Drawing, Top View ............... 10-6
10-7. Overall Parts Identication Drawing, Top View (Assembly Locations) ..... 10-8
10-8. Overall Parts Identication Drawing, Top View (Cable Locations) ....... 10-10
10-9. Overall Parts Identication Drawing, Top View (Connector Locations) . . . . . 10-14
10-10. Overall Parts Identication Drawing, Bottom View . . . . . . . . . . . . . . 10-15
10-11. Overall Parts Identication Drawing, Side View ............... 10-16
10-12. Overall Parts Identication Drawing, Left-Side View . . . . . . . . . . . . . 10-17
10-13. Overall Parts Identication Drawing, Side View (A4 Idler Phase-Lock Loop) . . 10-18
10-7. Overall Parts Identication Drawing, Side View (A6 YTO Phase-Lock Loop) .. 10-20
10-8. Overall Parts Identication Drawing, Side View (A7 FRAC'N Synthesizer) . . . 10-21
Contents-7

Tables
1-1. Hewlett-Packard Sales and Service Oces . . . . . . . . . . . . . . . . . . 1-4
1-2. Packaging for a 2/8 Module . . . . . . . . . . . . . . . . . . . . . . . . . 1-6
3-1. Default HP-MSIB Address Map ....................... 3-3
4-1. Static-Safe ESD Accessories ........................ 4-3
4-2. A3 Power Supply Measurements .. .. .. .. .. .. .. .. .. .. .. 4-24
4-3. Measurements at A6A1 100 MHz Reference (J6) and (J7) Pin 4 ........ 4-37
4-4. State Worksheet . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-57
5-1. Recommended Test Equipment . . . . . . . . . . . . . . . . . . . . . . . 5-1
5-2. Components for the 300 MHz Up-Converter . . . . . . . . . . . . . . . . . 5-5
5-3. 300 MHz Up-Converter Parts List . . . . . . . . . . . . . . . . . . . . . . 5-6
5-4. Snier Loop Assembly Parts List ...................... 5-9
5-5. Resistive Divider Parts . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-11
6-1. Adjustable Components .. .. .. .. .. .. .. . .. .. .. .. .. . 6-4
6-2. Equipment Required for Adjustments . . . . . . . . . . . . . . . . . . . . 6-5
9-1. Required Tools . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9-2
Contents-8

1
Getting Started
This chapter provides information to help get you started so that your local oscillator source is
serviced properly.
This chapter answers the questions \What Is Servicing?" and \When Is Servicing Needed?". It
then describes the procedures used to return your local oscillator source to Hewlett-Packard for
servicing.
Getting Started 1-1

What Is Servicing?
Servicing includes testing, adjusting, calibrating, troubleshooting, and repairing.
There are dierent categories of testing available. These categories are module verication
tests, system verication of operation tests, and system performance tests.
Module
Verication Tests
Module verication tests are used to test modules so that when assembled
into a system, the system meets the system's specications. These sets of
tests are used during servicing.
System
Verication of
Operation Tests
System verication of operation tests are used to verify the proper
operation of an instrument and to verify that the instrument meets
approximately 80% of its measurement related specications. These sets of
tests are subsets of system performance tests.
System
Performance
Tests
System performance tests are used to verify the proper operation of a
complete modular measurement system (MMS) to full system specications.
This service guide provides information related to testing, adjusting, calibrating,
troubleshooting, and repairing your local oscillator source ; it also provides information on
module verication tests. These sets of tests are used during servicing.
For information related to system verication of operation tests
, refer to the HP 70000 Modular
Spectrum Analyzer Installation and Verication Manual , and for information related to
system performance tests, refer to the documentation for HP 11990A system performance test
software.
When Is Servicing Needed?
Servicing is needed:
if error messages are displayed on your HP 70000 Series display
if an ERROR LED or FAULT LED is on
to perform repairs or adjustments or both
to verify the correct operation of your local oscillator source
or, if applicable, when upgrading rmware
If you determine that your local oscillator source needs servicing, you can perform
the servicing yourself using the information in this manual or, you can return your
local oscillator source to a Hewlett-Packard service center.
1-2 Getting Started

If You Want Hewlett-Packard to Service Your
Local Oscillator Source
Before calling Hewlett-Packard or returning your local oscillator source for service, please read
your warranty information. Warranty information is printed at the front of this service guide.
In any correspondence or telephone conversations, refer to the local oscillator source by
its full model number and full serial number. With this information, the Hewlett-Packard
representative can determine whether your unit is still within its warranty period.
Determining Your Local Oscillator Source's Serial Number
When a module is manufactured by Hewlett-Packard, it is given a unique serial number. This
serial number is attached to a label on the front frame or front panel of the module. A serial
number label is in two parts. (Refer to Figure 1-1.) The rst part makes up the serial number
prex and consists of four digits and a letter. The second part makes up the serial number
sux and consists of the last ve digits on the serial number label. The serial number prex is
the same for all identical modules; it only changes when a change in the electrical or physical
functionality is made. The serial number sux, however, changes sequentially and is dierent
for each module.
Figure 1-1. Typical Serial Number Label
Getting Started 1-3