HP 8562e schematic

Errata

Title & Document Type: 8562E Spectrum Analyzer Service Manual

Manual Part Number: 08562-90216

Revision Date: 1997-12-01

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.

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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.

Service Guide

HP 8562E Spectrum Analyzer

HEWLETT

Fia

HP Part No. 08582-90218 Supersedes 08582-90209

Printed in USA December 1997

PACKARD

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 fitness 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.

Copyright Hewlett-Packard Company 1996 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, USA

Certification

Hewlett-Packard Company certifies that this product met its published specifications at the time of shipment from the factory. Hewlett-Packard further certifies 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.

Regulatory Information

The HP 8560 E-Series Spectrum Analyzer Calibration Guide contains regulatory information.

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 firmware designated by Hewlett-Packard 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 firmware 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 modification or misuse, operation outside of the environmental specifications 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.

. . III

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

Ofice.

Safety Notes

The following safety notes are used throughout this manual. Familiarize yourself with each of the notes and its meaning before operating this instrument.

Caution

Warning

Instruction

Manual

Caution denotes a hazard. It calls attention to a procedure that, if not

correctly performed or adhered to, could result in damage to or destruction of the instrument. Do not proceed beyond a caution sign until the indicated conditions are fully understood and met.

Warning

correctly performed or adhered to, could result in injury or loss of life. Do not proceed beyond a understood and met.

The instruction manual symbol. The product is marked with this symbol when it is necessary for the user to refer to the instructions in the manual.

denotes a hazard. It calls attention to a procedure which, if not

warning

note until the indicated conditions are fully

General Safety Considerations

Warning

Caution

This is a Safety Class I 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 the instrument, is likely to make the instrument dangerous. Intentional interruption is prohibited.

No operator serviceable parts inside. Refer servicing to qualified personnel. To prevent electrical shock, do not remove covers.

Before switching on this instrument, make sure that the line voltage selector switch is set to the voltage of the power supply and the correct fuse is installed.

How to Use This Guide

Chapter 7, “General Troubleshooting,”

can be used to identify the location of a problem to a

board or functional area in the spectrum analyzer. Chapters 8 through 13, which cover the functional areas, can then be used to help you localize

the problem further. Once the faulty area is identified, the adjustments and parts information located in chapters 1

through 6 is available to help you fix the problem.

This guide uses the following conventions:

Front-panel

Sof

Screen Text

tkq

Key)

This represents a key physically located on the instrument. This indicates a “softkey,”

a key whose label is determined by the instrument

firmware. This indicates text displayed on the spectrum analyzer screen.

Documentation Outline

HP 8560 E-Series Spectrum Analyzer Calibration Guide

n Tells you how to run verification software. n Tells you the specifications of your spectrum analyzer. n Tells you how to test your spectrum analyzer.

HP 8560

n Tells you how to make measurements with your spectrum analyzer. n Tells you how to install the spectrum analyzer. n Tells you how to program your spectrum analyzer.

HP 8560 E-Series Spectrum Analyzer Quick Reference Guide

n Is an abbreviated version of the HP 8560 E-Series Spectrum Analyzer User’s Guide. n Provides you with a listing of all remote programming commands.

HP 8560 E-Series Spectrum Analyzer Component Level Information

n Provides schematics and parts lists for the instrument.

E-Series

Spectrum

Analyzer

User’s Guide

1. General Information

Serial Numbers and Repair Information Instrument Variations HP 85629B Test and Adjustment Module Service Kit Electrostatic Discharge

Reducing Potential for ESD Damage Static-Safe Accessories

Returning Instruments for Service

Service Tag Original Packaging

0 t her Packaging Recommended Test Equipment Sales and Service Offices

2. Adjustment Procedures

.Introduction

Safety Considerations

Which Adjustments Should Be Performed?

Test Equipment

Adjustable and Factory-Selected Components

Adjustment Tools

Instrument Service Position Using the TAM

Test Equipment

Adjustment Indicator Front End Cal (adjustment)

1. High Voltage Power Supply Adjustment

2. Display Adjustment

3. IF

4. IF Amplitude Adjustments

5. DC Log Amplifier Adjustments

6. Sampling Oscillator Adjustment

7. YTO Adjustment

8. LO Distribution Amplifier Adjustment

9. Frequency Response Adjustment

10. Calibrator Amplitude Adjustment

11. 10 MHz Reference Adjustment-OCXO (Non-Option 103)

12. 10 MHz Reference Adjustment-TCXO (Option 103)

13. Demodulator Adjustment

14. External Mixer Bias Adjustment (Non-Option 327)

15. External Mixer Amplitude Adjustment (Non-Option 327)

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

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

Bandpass

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

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

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

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

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Adjustment

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

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

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

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

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......

........

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.........

......

l-l l-2 l-3 l-4 l-4 l-5 l-6 l-6 l-6 l-6 l-7 l-9

1-16

2-l 2-2 2-2 2-2 2-2 2-3 2-3 2-9 2-9

2-9 2-12 2-13

2-15 2-21 2-26 2-30 2-34 2-37 2-40 2-43 2-47 2-48 2-51 2-53 2-56 2-57

Contents-l

16. YIG-Tuned Filter/Mixer (RYTHM) Adjustment

17. 16 MHz PLL Adjustment

18. 600 MHz Reference Adjustment

Frequency Response Adjustment Software

Getting Started

Spectrum Analyzers Controller (Computer) Test Equipment Warmup Time

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

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

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

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

Test Equipment Warmup Spectrum Analyzer Warmup

Equipment Connections

Computer (Controller) Setup

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

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

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

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

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

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

HP-IB Cables ..........................

10 MHz Reference .........................

Adjustment Setups ........................

Using Frequency Response Adjustment Software

Loading the Program Program Operation Conditions Menu

Test Record Header Information System Mass Storage File Location

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

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

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

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

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

Power Sensors ..........................

Setting HP-IB Addresses

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

Storing and Loading the Conditions File Getting to the Adjust Menu

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

Verifying the HP-IB ........................

Querying the Spectrum Analyzer Serial Number Exiting Frequency Response Adjustment

Dual-Bus Operation ........................

Sensor Utilities Menu

Adding a Power Sensor Data File

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

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

Viewing and Editing a Power Sensor Data File Deleting a File

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

Changing the System Mass Storage File Location Listing Available Power Sensor Data Files Returning to the Conditions Menu

Adjust Menu

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

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

Single Test ............................

Calibrate Power Sensor

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

List Equipment ..........................

Frequency Response Adjustment Menu Softkeys

Conditions Menu Sensor Utilities Menu Adjust Menu

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

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

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

Front End Cal (YIG-Tuned Filter/Mixer (RYTHM) and Frequency

Response Adjustment)

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

Frequency Response Adjustment Error Messages

Error Messages Beginning with Alphabetic Characters

Address must be from 0 to 30 inclusive

...........

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

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

...........

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

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

...........

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

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

..........

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

2-60 2-63 2-66

3-2 3-2 3-2 3-3 3-3 3-3 3-3 3-4 3-4 3-4 3-4 3-4 3-5 3-5 3-5 3-6 3-6 3-6 3-6 3-7 3-7 3-8 3-8 3-8 3-8 3-8

3-9

3-9 3-10 3-10 3-10 3-10 3-10 3-10 3-11 3-11 3-11 3-12 3-12 3-12 3-13

3-14 3-16 3-16 3-16

Contents-2

Cal Factor outside of 0 to 150% range entered

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

CONDITIONS file from system file location is not compatible! WARNING

Conditions Menu DUT ID disagrees with responding DUT ID .....

Data not accepted, check entry format ................

DUT doesn’t respond at address listed ................

File <filename> not found .....................

Insufficient equip. to do test <test number> : <test name> ......

No HP-IB address listed for DUT ..................

Non-numeric entry other than S entered, or frequency

<=O

......

No sensor file found for <sensor model> S/N <sensor serial #> ....

Power meter reads <value> Select code

<value>

does not currently support HP-IB operations

dBm

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

...

Sensor serial number must be from 1 to 99999 ............

System mass storage file location catalog cannot be read ........

This program does not support the current DUT ...........

Unable to load CONDITIONS file from listed system file location

....

Unable to load data from <sensor filename> .............

Unable to obtain catalog from <system mass storage file location> Unable to reach power level of <value>

dBm

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

...

WARNING: CONDITIONS file from system file location is not compatible!

Error Messages Beginning with Numeric Characters ...........

8481A Sensor cal data minimum frequency not <= 50 MHz ......

8481A Sensor cal data maximum frequency not >= 300 MHz ......

8485A Sensor cal data minimum frequency not = 10 MHz .......

8485A Sensor cal data maximum frequency not >= 26.5 GHz .....

Error Messages Beginning with Variables ...............

<filename> file not found .....................

<keyboard entry> is a non-numeric entry ..............

<number of instruments> instruments have HP-IB addresses of <HP-IB

address> ...........................

<power meter model number> doesn’t read signal to be in -1 +/-5

range <source model number> signal not in +5 +/-5 <source model number> signal not in -1 +/-5 <source model number>

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

dBm

range ......

dBm

range ......

+lO dBm

signal not in

+lO

+/-8

dBm

range

dBm

<source model number> has a cold oven ...............

<source model number> is unlevelled ................

3-16 3-16 3-16 3-16 3-16 3-17 3-17

3-17 3-17 3-17 3-17 3-17 3-17

3-17 3-17 3-18 3-18 3-18 3-18 3-18 3-18 3-18 3-18 3-18 3-18 3-19 3-19 3-19

3-19

3-19 3-19 3-19 3-19 3-19 3-19

4. Assembly Replacement

Access to Internal Assemblies ......................

Cable Color Code ...........................

Procedure 1. Spectrum Analyzer Cover ................

Procedure 2. Al Front Frame/Al8 CRT ...............

Procedure 3. Procedure 4. Procedure 5. A2, A3, A4, and A5 Assemblies Procedure 6. A6 Power Supply Assembly Procedure 7.

AlAl

Keyboard/Front Panel Keys ............

AlA

RPG

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

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

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

A6Al

High Voltage Assembly ..............

Procedure 8. A7 through Al3 Assemblies ...............

A7 First LO Distribution Amplifier A8 Low Band Mixer

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

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

4-2 4-3 4-4

4-5 4-13 4-14 4-15 4-21 4-25 4-28 4-30 4-31

Contents-3

A9 Input Attenuator A10 YIG-Tuned Filter/Mixer (RYTHM)

AllYTO

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

Al3 Second Converter Procedure 9. Al4 and Al5 Assemblies

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

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

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

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

Procedure 10. Al6 Fast ADC and Al7 CRT Driver ...........

Procedure 11. Bl Fan Procedure 12.

BTl

Procedure 13. Rear Frame/Rear Dress Panel Procedure 14. W3 Line Switch Cable Procedure 15. EEROM (A2U500) Procedure 16. A21 OCXO

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

Battery

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

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

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

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

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

5. Replaceable Parts

Ordering Information .........................

Direct Mail-Order System ......................

Direct Phone-Order System .....................

Parts List Format ...........................

Firmware-Dependent Part Numbers ...................

6. Major Assembly and Cable Locations

Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

4-32 4-34 4-35 4-36 4-37 4-40 4-42 4-43 4-44 4-48 4-55 4-56

5-l 5-l 5-2 5-2 5-2

6-l

7. General Troubleshooting

Introduction

Assembly Level Text

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

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

Block Diagrams ........................... 7-l

Assembly Test Points

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

Pad ...............................

Test Jack ............................

Ribbon Cables

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

Service Cal Data Softkey Menus

Troubleshooting to a Functional Section

TAM (Test and Adjustment Module)

Loading and Running the HP

Loading the software .......................

HP-IB addresses .........................

Data

files

and system mass storage files ...............

Executing a test .........................

TAM Requirements Test Connectors

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

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

Revision Connectors ........................

Inconsistent Results Erroneous Results Blank Display

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

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

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

Automatic Fault Isolation

Display/Power Supply .......................

Controller Check .........................

ADC/Interface Check .......................

IF/LOG Check ..........................

LO Control Check ........................

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

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

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

8562E/TAM

Interface Software (TAM I/F SW)

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

7-l 7-l

7-2 7-2 7-2 7-2 7-6 7-8

7-10 7-10

7-10 7-11 7-11 7-11 7-12 7-13 7-13 7-13 7-13 7-13 7-14 7-14 7-14 7-14 7-14 7-15

Contents-4

RF Low Band Check .......................

Manual Probe Troubleshooting ....................

RF Path Fault Isolation .......................

Calibration Oscillator Troubleshooting Mode ..............

Error Messages ............................

Viewing Multiple Messages ......................

Error Message Elimination ......................

System Analyzer Programming Errors (100 to 150) ............

ADC Errors (200 to 299) .......................

LO and RF Hardware/Firmware Failures (300 to 399) ..........

YTO Loop Errors (300 to 301) ...................

Roller PLL Errors (302 to 316) ...................

YTO Loop Errors (317 to 320) ...................

Roller Oscillator Errors (321 to 329) .................

YTO Loop Error (331) ......................

600 MHz Reference Loop (333) ...................

YTO Leveling Loop (334) .....................

Sampling Oscillator (335) .....................

10 MHz Reference (336) ......................

Fractional N PLL (337) ......................

YTO Loop Settling Errors (351 to 354) ...............

Sampling Oscillator (355) .....................

Span Accuracy Calibration Errors (356 to 361) ............

Automatic IF Errors (400 to 599) ...................

System Errors (600 to 651) ......................

Digital and Checksum Errors (700 to 799) ...............

EEROM Checksum Errors (700 to 704) ...............

Program ROM Checksum Errors (705 to 710) ............

RAM Check Errors (711 to 716) ..................

Microprocessor Error (717) .....................

Battery Problem (718) ........................

Model Number Error (719) ......................

System Errors (750 to 759) ......................

Fast ADC Error (760) ........................

Option Module Errors (800 to 899) ..................

User-Generated Errors (900 to 999) ..................

Block Diagram Description .......................

RF Section .............................

A7 SLODA ...........................

A8 Low Band Mixer ........................

A9 Input Attenuator .......................

A10 YIG-Tuned Filter/Mixer ....................

All YTO ............................

Al3 Second Converter .......................

Second IF Amplifier (part of A15) ..................

Third Converter (part of A15) ...................

Flatness Compensation Amplifiers (part of A15)

Synthesizer Section .........................

Sweeping the First LO .......................

Reference PLL (part of A15) ....................

YTO PLL (A7, All, part of A14, part of A15) ............

...........

7-15

7-15 7-16 7-16 7-17 7-17 7-18 7-18 7-19 7-20 7-20 7-20 7-23

7-24 7-25 7-26 7-26 7-26 7-26 7-26 7-27 7-27 7-27 7-28 7-37 7-37 7-37 7-38 7-39 7-39 7-39 7-39

7-40 7-40 7-40 7-41 7-42 7-43 7-43 7-43 7-44 7-44 7-44 7-44 7-44 7-45 7-45 7-46 7-46 7-46 7-46

Contents-5

Offset Lock Loop (part of A15)

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

Fractional N PLL (part of A14)

IF Section .............................

A4 Log Amplifier/Cal Oscillator Assembly

A5 IF Assembly .........................

ADC/Interface Section

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

ADC ..............................

Main ADC (part of A3 interface assembly) Fast ADC

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

Log Expand/Video Functions ....................

Triggering

Controller Section

EEROM Firmware Display ASM

Display/Power Supply Section

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

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

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

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

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

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

A6 Power Supply .........................

Al7 CRT Display Driver ......................

8. ADC/Interface Section

Troubleshooting Using the TAM

Automatic Fault Isolation

Keyboard/RPG Problems

Keyboard Interface RPG Interface

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

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

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

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

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

Triggering or Video Gating Problems Preselector Peaking Control (Real Time DAC) Flatness Control (RF Gain DACs) A3 Assembly Video Circuits

Log Offset/Log Expand Video MUX Video Filter

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

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

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

Video Filter Buffer Amplifier Positive/Negative Peak Detectors Peak Detector Reset Rosenfell Detector ADC MUX.

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

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

Variable Gain Amplifier (VGA) Track and Hold

A3 Assembly ADC Circuits

ADC Control Signals ADC Start/Stop Control ADCASM ADC

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

Ramp Counter

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

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

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

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

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

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

A3 Assembly Control Circuits

Analog Bus Drivers Analog Bus Timing Interface Strobe Select

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

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

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

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

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

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

Al6 Assembly Fast ADC Circuits (Option 007)

Video Input Scaling Amplifiers and Limiter

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

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

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

7-47

7-48 7-48 7-49 7-49 7-49 7-49 7-49 7-49 7-50 7-50 7-50 7-50 7-51 7-51 7-51 7-51

8-4 8-4 8-7 8-7 8-8

8-9 8-12 8-13 8-14 8-15

8-16 8-17

8-18 8-19

S-20

8-21 8-21

8-23

8-23 8-24 8-24 8-25 8-26 8-26 8-27 8-28 8-28 8-29

S-30

8-31 8-31

Contents-6

B-Bit Flash ADC Peak/Pit Detection

32 K-Byte Static RAM

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

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

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

Al6 Assembly Fast ADC Control Circuits (Option

CPU Interface and Control Registers Reference Clock Clock and Sample Rate Generator Trigger

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

16-Bit Post-Trigger Counter

15-Bit (32 K)

Video Trigger Comparator

9. IF Section

Troubleshooting Using the TAM

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

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

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

ircular

Address Counter

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

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

Troubleshooting the Log Amplifier with the TAM Troubleshooting A5 with the TAM

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

Troubleshooting the Cal Oscillator with the TAM

Automatic IF Adjustment

Parameters Adjusted Requirements

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

Performance Test Failures

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

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

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

IF Gain Uncertainty Performance Test Scale Fidelity Performance Test

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

Resolution Bandwidths Performance Tests

Log Amplifier (P/O A4 Assembly)

Log Amplifier

Linear Amplifiers Video Offset Video Output

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

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

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

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

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

Frequency Counter Prescaler/Conditioner AM/FM Demodulator

4.8 kHz IF Filters

10.7 MHz IF Filters

4.8 kHz and 10.7 MHz IF Filters

10.6952 MHz

Input Switch

LO Switch

VCXO

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

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

Synchronous Detector

Limiter

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

Isolation Amplifier

Detector/Mixer

Log Offset/Gain Compensation

Log Offset Compensation Log Gain Compensation

Video MUX

A5 IF Assembly

IF Signature

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

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

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

Common IF Signature Problems

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

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

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

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

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

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

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

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

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

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

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

1 MHz Resolution Bandwidth Problems

30 kHz Resolution Bandwidth Problems

3 kHz and 10 kHz Resolution Bandwidth Problems

007)

..........

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

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

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

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

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

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

...........

8-32 8-33 8-33 8-34 8-34 8-36 8-37 8-37 8-38 8-38 8-39

9-3 9-4 9-4 9-8 9-9

9-10

9-11 9-12 9-12 9-12 9-13 9-13 9-13

9-14 9-15 9-16 9-16 9-16 9-17 9-17

9-18

9-19

9-20

9-21

9-22 9-26 9-29 9-30 9-30

Contents-7

Step Gains

Cal Oscillator (P/O A4 Assembly)

Cal Oscillator Unlock at Beginning of IF Adjust

Inadequate CAL OSC AMPTD Range

300 Hz to 3 kHz Resolution Bandwidth Out of Specification Low-Pass Filter

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

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

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

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

.......

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

Sweep Generator ..........................

AM/FM Demodulation, Audio Amplifier, and Speaker

10. Controller Section

Troubleshooting Using the TAM

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

..........

Blank Display ...........................

Digital Signature Analysis (DSA)

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

Display Problems ...........................

Line Generators

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

Blanking ..............................

Display Jumbled or Trace Off Screen

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

Intensity ..............................

Bad Characters or Graticule Long Lines Dimmer Than Short Lines

Analog Zero-Span Problems (Non-Option 007)

Frequency-Count Marker Problems Frequency Counter

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

State- and Trace-Storage Problems

Keyboard Problems

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

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

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

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

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

9-31 9-32 9-33 9-33 9-34 9-38

9-38

10-2 10-2 10-4 10-4 10-4 10-5

10-7 10-10 10-10 10-11 10-12 10-13 10-14 10-15

lo-16

11. Synthesizer Section

Troubleshooting Using the TAM Troubleshooting Test Setup

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

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

Confirming a Faulty Synthesizer Section General PLL Troubleshooting

PLL Locked at Wrong Frequency Unlocked PLL

Unlocked Reference PLL

Operation Troubleshooting

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

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

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

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

Third LO Driver Amplifier

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

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

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

Unlocked Offset Lock Loop (Sampling Oscillator)

Operation Troubleshooting

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

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

Check path to phase/frequency detector (steps 14-19)

Unlocked YTO PLL

Operation

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

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

Troubleshooting an Unlocked YTO PLL

Unlocked Fractional N PLL

Operation

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

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

Confirming an Unlocked Condition Fractional N PLL

Frequency Span Accuracy Problems

Determining the First LO Span Confirming Span Problems

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

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

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

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

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

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

.........

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

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

11-2 11-8

11-8 11-13 11-13 11-15 11-16 11-16 11-16 11-19 11-20 11-20 11-20 11-22 11-23 11-23 11-25 11-31 11-31 11-31 11-32 11-36 11-36 1 l-37

Contents-6

YTO Main Coil Span Problems (LO Spans YTO FM Coil Span Problems (LO Spans 2.01 MHz to 20 MHz)

Fractional N Span Problems (LO Spans 12 MHz) ............

First LO Span Problems (All Spans) .................

First LO Span Problems (Multiband Sweeps)

Phase Noise Problems

Phase Noise in Locked versus Unlocked Spans Reference versus Reference PLL Phase Noise

Fractional N versus Offset PLL or YTO PLL Phase Noise ........

Fractional N PLL Phase Noise Sampler and Sampler IF Sweep Generator Circuit A21 OCXO

12. RF Section

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

Troubleshooting Using the TAM Low Band Problems

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

High Band Problems Low and High Band Problems A7 LO Distribution Amplifier A8 Low Band Mixer

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

A9 Input Attenuator Al3 Second Converter Al4 Frequency Control Assembly

LODA Drive

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

Control Latch for Band-Switch Driver .................

YTF Driver Circuit

Al5 RF Assembly

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

Confirming a Faulty Third Converter .................

Confirming Third Converter Output Third Converter

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

Flatness Compensation Control Control Latches

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

SIG ID Oscillator (Option 008) 10 MHz Reference

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

>20

MHz)

..........

.....

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

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

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

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

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

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

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

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

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11-38 11-38 1 l-39

11-40 11-41 11-43 1 l-43 11-43 1 l-44 11-44 1 l-45 11-46 11-50

12-2 12-4 12-5 12-5 12-6 12-7 12-8 12-9

12-11

12-11 12-12 12-13 12-16 12-16 12-16 12-17 12-18 12-18 12-19 12-20

13. Display/Power Supply Section

Troubleshooting Using the TAM

Blank Display (Using the TAM) Blank Display Blanking Signal Display Distortion Focus Problems Intensity Problems

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

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

A6 Power Supply Assembly Troubleshooting ...............

Dead Power Supply

Check the Supply Voltages

Kick-start/Bias Buck Regulator Line Fuse Blowing Supply Restarting Every 1.5 Seconds (Kick Start)

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

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13-4 13-5 13-6 13-7 13-8 13-9

13-10

13-12 13-12 13-12 13-13 13-13 13-14 13-14

Contents-9

Low Voltage Supplies Buck Regulator Control Loop High Voltage Supplies CRT Supply Dropping Out Buck Regulator Control DC-DC Converter Control

Power Up

A. Component-Level Information Packets

Index

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13-15 13-15 13-15 13-16 13-17 13-17 13-18

Contents-10

Figures

l-l. Example of a Static-Safe Workstation

l-2. Spectrum Analyzer Shipping Container and Cushioning Materials 2-l. High Voltage Power Supply Adjustment Setup 2-2. Display Adjustment Setup 2-3. CRT Adjust Pattern 2-4. A2 Display Adjustment Locations 2-5. IF 2-6. TAM Connector Pin Locations 2-7. IF Amplitude Adjustment Setup 2-8. IF Amplitude Adjustment Locations 2-9. DC Log Adjustment Setup

2-10. DC Log Adjustment Locations

11. Sampler Adjustment Setup 2-12. TAM Connector Pin Locations 2-13. YTO Adjustment Setup 2-14. YTO Adjustment Locations 2-15. First LO Distribution Amplifier Adjustment Setup 2-16. TAM Connector Pin Locations 2-17. Frequency Response Adjustment Setup 2-18. Calibrator Amplitude Adjustment Setup 2-19. 10 MHz Reference Adjustment Setup and Adjustment Location 2-20. 10 MHz Reference Adjustment Setup-TCXO 2-21. Demodulator Adjustment Setup 2-22. Demodulator Adjustment Locations 2-23. External Mixer Bias Adjustment Setup 2-24. External Mixer Amplitude Adjustment Setup 2-25. RYTHM Adjustment Setup 2-26. 16 MHz PLL Adjustment Setup 2-27. 16 MHz PLL Adjustment Location

3-l. Front End Cal Adjustment Setup

1. Hinged Assemblies 4-2. Discharging High Voltage on the CRT 4-3. A9, A18, and Line-Switch Assembly Mounting Screws 4-4. front frame Mounting Screws 4-5. Installing the CRT and front frame Assemblies 4-6. Placing the CRT into the Front Frame 4-7. A2, A3, A4, and A5 Assembly Removal 4-8. Assembly Cables (1 of 2) 4-9. Coaxial Cable Clip

4-10. HP-IB and 4-l 1. A6 Power Supply Connections 4-12. Power Supply Cover

Bandpass

Adjustment Setup

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AlAl Wl

Cable Placement

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l-5

l-8 2-13 2-15 2-17 2-19 2-21 2-22 2-26 2-27 2-30 2-31 2-34 2-35 2-37 2-39 2-40 2-41

2-44 2-47 2-49

2-51

2-53 2-55 2-56 2-57 2-60 2-63 2-64 3-15

4-4

4-7

4-8

4-9

4-10 4-11 4-16 4-17 4-19 4-20 4-23 4-24

Contents-l 1

4-13.

Al6 Fast ADC and Al7 CRT Driver Mounting Screws

4-14.

HP 85623 Assembly Locations

4-15.

A9 Mounting Screw at Right Side Frame

4-16.

A10 Mounting Screws

4-17.

HP 85623 All Mounting Screws at Right Side Frame

4-18.

Al4 and Al5 Assembly Removal

4-19.

Al4 and Al5 Assembly Cables

4-20.

Al6 and Al7 Mounting Screws

4-21.

Al6 Cable Routing

4-22.

Main Deck Screws

4-23.

A6 Power Supply Cover

4-24.

W3 Dress and Connection to A6 Power Supply

4-25.

Line-Switch Mounting Screw and Cable Dress

4-26

W3 Cable Connector

4-27

Side Frame Mounting Screws

4-28

A21 OCXO Mounting Screws

5-l

Parts Identification, Assembly Mounting

5-2

Parts Identification, Cover Assembly

5-3

Parts Identification, Main Chassis

5-4

Parts Identification, RF Section

5-5

Parts Identification, Front Frame

5-6

Parts Identification, Rear Frame

6-l

Hinged Assemblies

6-2

Top View (A2 Unfolded)

6-3

Top View (A2 and A3 Unfolded)

6-4

Top View (A2, A3, A4, and A5 Unfolded)

6-5.

Bottom View (Al5 Unfolded) Bottom View (Al5 and Al4 Unfolded)

6-6. 6-7.

Al6 Fast ADC (Option 007)

6-8.

HP 85623 Front End Rear View

6-9.

7-l.

Assembly Test Points

7-2.

Ribbon Cable Connections (1 of 2)

7-3.

Service Cal Data Menu

7-4.

Functional Sections

7-5.

Phase Lock Loops Simplified Block Diagram

7-6. 7-7.

Overall Block Diagram (1 of 3)

8-l.

A3 Test Connectors

8-2.

A3 Interface Assembly Block Diagram Fast ADC (Option 007) Block Diagram

8-3.

9-l.

A4 and A5 Test Connectors

9-2.

IF Section Troubleshooting with the TAM IF Adjust Signature

9-3. 9-4.

Detailed IF Adjust Signature (1) Detailed IF Adjust Signature (2)

9-5.

Detailed IF Adjust Signature (3)

9-6. 9-7.

Detailed IF Adjust Signature (4) Detailed IF Adjust Signature (5)

9-8.

Noisy Signature

9-9.

Noise with Correct Shape

9-10.

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4-26

4-29

4-33 4-34 4-35

4-37

4-39

4-40

4-41

4-45

4-47

4-49

4-51 4-52 4-54

4-56

5-15 5-23 5-25 5-27

5-29

5-31

6-4 6-4 6-5 6-6 6-7 6-8

6-9

6-10 6-11

7-3

7-4

7-7

7-42

7-47 7-53 7-55

8-4

8-41

8-43

9-3

9-7 9-23 9-24

9-24

9-25 9-25 9-26 9-27 9-27

Contents-12

9-11. Region B Amplitude Variation ....................

9-12. Region B Amplitude Offset ......................

9-13. Faulty Crystal Short ........................

9-14. Faulty LC Pole ...........................

9-15. Faulty Crystal Symmetry ......................

9-16. Output Waveform, 10 kHz Resolution Bandwidth ............

9-17. Output Waveform, 3 kHz Resolution Bandwidth ............

9-18. Output Waveform, 1 kHz Resolution Bandwidth ............

9-19. Output Waveform, 300 Hz Resolution Bandwidth ............

9-20.

Failed Crystal Set Symptoms .....................

9-21. A4 Log Amplifier/Cal Oscillator Block Diagram ............

9-22. A5 IF Assembly Block Diagram ....................

10-l. A2 Test Connectors .........................

10-2. Line Generator Output Waveforms ..................

10-3. Blanking Waveforms ........................

10-4. Expanded Blanking Waveforms ....................

10-5. Switch Driver Waveform LCHAR ...................

10-6. Distorted X/Y Line Generator Waveforms ...............

10-7. Expanded X/Y Line Generator Waveforms ...............

10-S. Normal X/Y Line Generator Waveforms ................

10-9.

Delta X Waveform .........................

10-10. Delta Y Waveform .........................

10-11. 10-12. A2 Controller Block Diagram

11-l. Al4 and Al5 Test Connectors 11-2. TAM Connector Pin Locations 11-3. YTO Loop Test Setup

11-4. Sampler and Sampling Oscillator Test Setup ..............

11-5. PLL Locked at Wrong Frequency

11-6. Unlocked PLL

11-7. Troubleshooting an Unlocked YTO PLL ................

11-8. VCO Bias Voltages

11-9. HP 85623 Sweep and Scan Ramps ..................

11-10. Simplified Synthesizer Section ....................

1 l-11. Simplified Al4 Assembly Block Diagram 11-12. Simplified Al5 Assembly Block Diagram 11-13. Frequency Control Block Diagram

11-14. RF Assembly Block Diagram .....................

12-1. Al4 and Al5 Test Connectors

12-2. A14J10, Solder Side of Al4 (Ig

12-3. A7 First LO Distribution Amplifier Drive 12-4. HP 85623 Rear-Panel LO SWP Output 12-5. HP 85623 Signal at A14J15 Pin 1

12-6. 10 MHz Reference at A15J302 ....................

12-7. 10 MHz TTL Reference at

12-8. Figure 12-8. RF Section, Troubleshooting Block Diagram ........

13-1. Simplified Section Block Diagram ...................

13-2. Al7 Test Connector .........................

13-3. Probe Power Socket .........................

13-4. A6 Power Supply Block Diagram ...................

13-5. Al7 CRT Driver Block Diagram

DEFl

Synchronization ........................

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nore Pin Numbers on Mating Connector) . .

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U304

Pin 13

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

9-28 9-28 9-29 9-30 9-31 9-35 9-36 9-36 9-37

9-37 9-41 9-45

10-3

10-5

10-6

10-7

10-S

10-9

10-10 10-11 10-12 10-13 10-17

11-3

11-11 11-12 11-14 11-15 11-25 11-34 1 l-42 1 l-47 1 l-48 1 l-49 11-51 11-53

12-2 12-6

12-12 12-14 12-14 12-21 12-22 12-25

13-2 13-5 13-7

13-19 13-21

Contents-13

A-l. HP 85623 Interconnect Block Diagram . . . . . . . . . . . . . . . .

A-5

Contents-14

Tables

l-l. Instrument Variations l-2. Service Kit Contents l-3. Static-Safe Accessories

l-4. Recommended Test Equipment l-5. Hewlett-Packard Sales and Service Offices 2-l. Related Adjustments 2-2. Adjustable Components 2-3. Factory Selected Components 2-4. TAM Adjustments 2-5. Required Test Equipment for TAM 2-6. Factory-Selected LC Filter Capacitors 2-7. LC Factory-Selected Capacitor Selection 2-8. Factory-Selected XTAL Filter Capacitors 2-9. XTAL Factory-Selected Capacitor Selection

2-10. Capacitor Part Numbers 2-11. Sampling Adjustments 2-12. Conversion Loss Data

3-1. Required Test Equipment Summary 4-l. Required Tools 5-l. Reference Designations, Abbreviations and Multipliers 5-2. Manufacturers Code List 5-3. Replaceable Parts

7-l. Location of Assembly Troubleshooting Text 8-l. W2 Control Cable Connections

8-2. Automatic Fault Isolation References 8-3. TAM Tests versus A3 Test Connectors 8-4. Keyboard Matrix 8-5. Counter Frequencies

8-6. Trigger MUX Truth Table 8-7. A3U102 Latch Outputs 8-8.

HMUXSELO/l

8-9. Logic Levels at A3U108

S-10. Demultiplexer A3U410 Truth Table 8-11. Demultiplexer A3U500 Truth Table 8-12.

LP/Q

Truth Table

8-13. Control Word at Primary Address (U3 and U4)

9-l. Automatic Fault Isolation References

9-2. TAM Tests versus Test Connectors

9-3. Sweep Width Settings

10-l. TAM Tests versus Test Connectors 10-2. Gate Times 11-l. Measured Signal Line Location 11-2. Automatic Fault Isolation References

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versus Detector Mode

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l-2 l-4 l-6

l-10 1-17

2-4 2-6 2-8

2-10 2-11 2-23 2-23 2-24 2-24 2-25 2-36 2-59

3-3 4-3 5-3 5-6 5-7

7-9 8-2 8-5

8-6

8-7

8-9

8-18

S-20

8-22

S-30 S-30

8-33 8-34

9-4

9-5

9-9

10-2

10-14

11-3 11-4

Contents-15

11-3. TAM Tests versus Test Connectors 11-4. Center Frequency Tuning Values 11-5. Sampling Oscillator Test Frequencies 11-6. Sampling Oscillator PLL Divide Numbers 11-7. Amplifier Polarities

11.8. Voltages in FM Coil and Main Loop Drivers 11-9. Main Coil Coarse and Fine DACs Voltages

11-10. Postscaler Divide Numbers 11-11. Unlocked Fractional N Troubleshooting Areas 11-12. Divider and Integrator Troubleshooting 11-13. Sweep Signal Destination versus Span

11-14. Harmonic Mixing Number versus Center Frequency ...........

11-15. Settings of Sweep Switches 11-16. Settings for Switches and Comparators

12-1. Automatic Fault Isolation References 12-2. TAM Tests versus Test Connectors 12-3. HP 85623 Attenuator Control Truth Table 12-4. Sweep + Tune Multiplier Values 12-5. RF Section Mnemonic Table 13-1. Wl Power-Cable Connections 13-2. Automatic Fault Isolation References 13-3. TAM Tests versus Test Connectors

A-l. HP 8562 Spectrum Analyzer Documented Assemblies ..........

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11-6

11-9 11-13 11-21 11-24 11-29 11-29 11-32 11-33 11-35 11-36 11-36 11-38 11-41

12-3 12-4

12-9 12-15 12-23

13-3

13-4

13-5

A-2

Contents-l 6

General Information

This HP

service the HP 85623 to the assembly level.

8562E

Spectrum Analyzer Service Guide contains information required to adjust and

Serial Numbers and Repair Information

Hewlett-Packard makes frequent improvements to its products to enhance performance, usability, or reliability. Hewlett-Packard service personnel have access to complete records of design changes to each type of equipment, based on the equipment serial number. Whenever you contact Hewlett-Packard about a product, have the complete serial number available to

ensure obtaining the most complete and accurate information possible.

The serial number label is usually attached to the rear of the product. The serial number has two parts: the prefix (two letters and the first four numbers), and the suffix (the last four

numbers).

Serial Number Label Example

The two letters identify the country in which the unit was manufactured. The four numbers of the prefix are a code identifying the date of the last major design change incorporated in your Hewlett-Packard product. The four-digit suffix is a sequential number and, coupled with the prefix, provides a unique identification for each unit produced. Whenever you list the serial number or refer to it in obtaining information about your Hewlett-Packard product, be sure to use the complete number, including the full prefix and the suffix.

Units which were produced before the serial number format was changed may also be covered by this documentation. On earlier serial number labels, the prefix consists of the first four

numbers and a single letter. The suffix is a five-digit sequential number.

General Information

l-1

c!a

3425A00564

HEWLETT PACKARD

Earlier Serial Number Label Example

The new serial number format (USOOOOOOOO) is always considered “above” the earlier format

(OOOOAOOOOO) h y

above” or “. . . .

w en ou encounter change information such as “. . . . serial prefix 3425A and

serial number

3425A00564

and above.”

Instrument Variations

There are options available to the HP 85623. The following table lists these options and

identifies the assemblies which are unique to them.

Table l- 1. Instrument Variations

Sweep Output)

HP 85623 Option 007

(Fast ADC)

HP 85623 Option 008

(SIG

ID)

HP 85623 Option 103

(Delete OCXO)

HP 85623 Option 104

and

Video Output)

Added

W19 Cable Assembly

Rear-Panel J 10 W58 Cable Assembly

Al6 Fast ADC Assembly

A3 Interface Assembly

(Opt 007)

W20 Cable Assembly

(Opt 007) W59 Cable Assembly Al5 RF Assembly (Opt 008)

Al5 RF Assembly (Opt 103)

Deleted

A3 Interface Assembly

Wd)

W20 Cable Assembly

(St4

Al5 RF Assembly (Std)

Al5 RF Assembly (Std) W49 Cable Assembly

W50 Cable Assembly

A21 OCXO HP 85620A Mass

Memory Module W24 Cable Assembly W36 Cable Assembly Front-panel Rear-panel

l-2 General Information

HP 85629B Test and Adjustment Module

When attached to the rear panel of the spectrum adjustment module (TAM) provides diagnostic functions for the HP 85623. The TAM is accessed by a computer running interface software; this software is supplied with Option 915, add Service Documentation. The TAM measures voltages at key points in the circuitry and

flags a failure whenever the voltage falls outside the limits. The TAM locates the failure

to a small functional area, which can then be examined manually. See chapter 7, “General Troubleshooting,” software.

for a complete description of how to use the TAM and its interface

amdyzer,

the HP 85629B test and

General Information

l-3

Service Kit

The spectrum analyzer service kit (HP part number 08562-60021) contains service tools

required to repair the instrument. Refer to Table l-2 for a list of items in the service kit.

Table l-2. Service Kit Contents

Description

Cable Puller PC Board Prop Line Filter Assembly

Line Switch Cable

Extender Cable BNC to SMB (snap-on) Cable

Connector Extractor Tool Kit

Quantity

1 1 1 1 1

HP Part Number

5021-6773 5021-7459 5061-9032 5062-0728 5062-0737

85680-60093

8710-1791

Electrostatic Discharge

Electrostatic discharge (ESD) all work performed on assemblies consisting of electronic components should be done at a static-free workstation. Figure l-l is an example of a static-safe workstation using two kinds of ESD protection:

Conductive table mat and wrist-strap combination

n Conductive floor mat and heel-strap combination

These methods may be used together or separately.

can damage or destroy electronic components. Therefore,

l-4 General Information

ist

Stra61

Building

Ground

w--A-

Cord

’

I-

Figure l-l. Example of a Static-Safe Workstation

Reducing Potential for ESD Damage

The suggestions that follow may help reduce ESD damage that occurs during instrument testing and servicing.

n Before connecting any coaxial cable to an spectrum analyzer connector for the first time

each day, momentarily ground the center and outer connectors of the cable.

Personnel should be grounded with a resistor-isolated wrist strap before touching the center

pin of any connector and before removing any assembly from the unit.

n Be sure all instruments are properly earth-grounded to prevent build-up of static discharge.

General Information

l-5

Static-Safe Accessories

Set includes: 3M static control mat 0.6 m x 1.2 m (2 ft x 4 ft) and 4.6 cm (15 ft) ground wire. (The wrist-strap and wrist-strap cord are not included. They must be ordered separately.)

Table 1-3. Static-Safe Accessories

Description

Wrist-strap cord, 1.5 m (5 ft). Wrist-strap, color black, stainless steel, without cord, four adjustable links and

7 mm post-type connection. ESD heel-strap (reusable 6 to 12 months).

9300-0980

9300-1383

9300-l 169

Returning Instruments for Service

Service Tag

If you are returning the instrument to Hewlett-Packard for servicing, fill in and attach a blue service tag. Service tags are supplied in the back of this chapter.

Please be as specific as possible about the nature of the problem. If you have recorded any error messages that appeared on the screen, or have completed a performance test record, or have any other specific data on the performance of the spectrum analyzer, please send a copy of this information with the unit.

Original Packaging

Before shipping, pack the unit in the original factory packaging materials if they are available. If the original materials are unavailable, identical packaging materials may be acquired through any Hewlett-Packard Sales and Service Office. Descriptions of the packaging materials are listed in Figure 1-2.

1-6 General Information

Other Packaging

Caution

Repackage the spectrum analyzer in the original packaging materials or with commercially available materials described in steps 4 and 5, below.

1. Attach a completed service tag to the instrument.

2. Install the front-panel cover on the instrument.

3. Wrap the instrument in antistatic plastic to reduce the possibility of damage caused by electrostatic discharge.

4. Use the original materials or a strong shipping container that is double-walled, corrugated cardboard carton with 159 kg (350 lb) bursting strength. The carton must be both large

enough and strong enough to accommodate the spectrum analyzer and allow at least

3 to 4 inches on all sides of the spectrum analyzer for packing material.

5. Surround the equipment with at least 3 to 4 inches of packing material, or enough to

prevent the equipment from moving in the carton. If packing foam is unavailable, the best

alternative is SD-240 Air

Air Cap looks like a plastic sheet covered with pink-colored Air Cap to reduce static electricity. Wrap the equipment several times in this material to both protect the equipment and prevent it from moving in the carton.

Spectrum analyzer damage can result from using packaging materials other than those specified. Never use styrene pellets in any shape as packaging materials. They do not adequately cushion the equipment or prevent it from

shifting in the carton. They cause equipment damage by generating static electricity and by lodging in the spectrum analyzer fan.

Cap

from Sealed Air Corporation (Commerce, CA 90001).

l-1/4

inch air-filled bubbles. Use the

6. Seal the shipping container securely with strong nylon adhesive tape.

7. Mark the shipping container handling.

8. Retain copies of all shipping papers.

“FRAGILE, HANDLE WITH CARE” to assure careful

General Information 1-7

+ 452 hidden pages