Agilent Technologies 856290216 User manual

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 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.

Service

Guide

HP

8562E

Spectrum

Analyzer

Fia

HEWLETT

PACKARD

HP Part No. 08582-90218 Supersedes 08582-90209

Printed in USA December 1997

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

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

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

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

correctly performed or adhered to, could result in injury or loss of life. Do

not proceed beyond a

warning

note until the indicated conditions are fully

understood and met.

Instruction

The instruction manual symbol. The product is marked with this symbol when it is

Manual

necessary for the user to refer to the instructions in the manual.

iv

General Safety Considerations

Warning

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.

Warning

No operator serviceable parts inside. Refer servicing to qualified personnel. To

prevent electrical shock, do not remove covers.

Caution

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.

V

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

Key)

This represents a key physically located on the instrument.

Sof

tkq

This indicates a “softkey,”

a key whose label is determined by the instrument

firmware.

Screen Text

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

E-Series

Spectrum

Analyzer

User’s Guide

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.

vi

Contents

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

Bandpass

Adjustment

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

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)

......

l-l

l-2

l-3

l-4

l-5

l-6

l-7

l-9

1-16

2-l

2-2

2-3

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

3.

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

...........

2-60

17. 16 MHz PLL Adjustment

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

2-63

18. 600 MHz Reference Adjustment

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

2-66

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

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

3-2

3-3

3-4

3-5

3-6

3-7

3-8

3-9

3-10

3-11

3-12

3-13

3-14

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>

dBm

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

Select code

<value>

does not currently support HP-IB operations

...

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

dBm

range

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

<source model number> signal not in

+5

+/-5

dBm

range ......

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

dBm

range ......

+lO

dBm

signal not in

+lO

+/-8

dBm

range

.

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

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

4. Assembly Replacement

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

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

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

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

Procedure 3.

AlAl

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

Procedure 4.

AlA

RPG

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

Procedure 5. A2, A3, A4, and A5 Assemblies

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

Procedure 6. A6 Power Supply Assembly

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

Procedure 7.

A6Al

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

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

A7 First LO Distribution Amplifier

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

A8 Low Band Mixer

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

3-16

3-17

3-18

3-19

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

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

4-32

A10 YIG-Tuned Filter/Mixer (RYTHM)

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

4-34

AllYTO

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

4-35

Al3 Second Converter

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

4-36

Procedure 9. Al4 and Al5 Assemblies

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

4-37

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

4-40

Procedure 11.

Bl

Fan

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

4-42

Procedure 12.

BTl

Battery

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

4-43

Procedure 13. Rear Frame/Rear Dress Panel

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

4-44

Procedure 14. W3 Line Switch Cable

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

4-48

Procedure 15. EEROM (A2U500)

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

4-55

Procedure 16. A21 OCXO

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

4-56

5. Replaceable Parts

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

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

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

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

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

5-l

5-2

6. Major Assembly and Cable Locations

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

6-l

7. General Troubleshooting

Introduction

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

7-l

Assembly Level Text

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

7-l

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

Assembly Test Points

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

7-2

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

7-2

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

7-2

Ribbon Cables

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

7-2

Service Cal Data Softkey Menus

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

7-6

Troubleshooting to a Functional Section

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

7-8

TAM (Test and Adjustment Module)

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

7-10

Loading and Running the HP

8562E/TAM

Interface Software (TAM I/F SW)

7-10

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

7-10

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

7-11

Data

files

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

7-11

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

7-11

TAM Requirements

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

7-12

Test Connectors

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

7-13

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

7-13

Inconsistent Results

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

7-13

Erroneous Results

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

7-13

Blank Display

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

7-13

Automatic Fault Isolation

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

7-14

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

7-14

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

7-14

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

7-14

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

7-14

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

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

7-16

7-17

7-18

7-19

7-20

7-23

7-24

7-25

7-26

7-27

7-28

7-37

7-38

7-39

7-40

7-41

7-42

7-43

7-44

7-45

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

7-47

7-48

7-49

7-50

7-51

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

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

Al6 Assembly Fast ADC Circuits (Option 007)

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

Video Input Scaling Amplifiers and Limiter

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

8-4

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

8-23

8-24

8-25

8-26

8-27

8-28

8-29

S-30

8-31

Contents-6

B-Bit Flash ADC

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

Peak/Pit Detection

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

32 K-Byte Static RAM

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

Al6 Assembly Fast ADC Control Circuits (Option

007)

..........

CPU Interface and Control Registers

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

Reference Clock

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

Clock and Sample Rate Generator

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

Trigger

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

16-Bit Post-Trigger Counter

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

15-Bit (32 K)

C

ircular

Address Counter

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

Video Trigger Comparator

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

9. IF Section

Troubleshooting Using the TAM

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

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

VCXO

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

Input Switch

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

LO Switch

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

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

...........

8-32

8-33

8-34

8-36

8-37

8-38

8-39

9-3

9-4

9-8

9-9

9-10

9-11

9-12

9-13

9-14

9-15

9-16

9-17

9-18

9-19

9-20

9-21

9-22

9-26

9-29

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

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

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

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

9-31

9-32

9-33

9-34

9-38

10-2

10-4

10-5

10-7

10-10

10-11

10-12

10-13

10-14

10-15

lo-16

11-2

11-8

11-13

11-15

11-16

11-19

11-20

11-22

11-23

11-25

11-31

11-32

11-36

1 l-37

Contents-6

YTO Main Coil Span Problems (LO Spans

>20

MHz)

..........

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

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

13. Display/Power Supply Section

Troubleshooting Using the TAM

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

Blank Display (Using the TAM)

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

Blank Display

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

Blanking Signal

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

Display Distortion

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

Focus Problems

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

Intensity Problems

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

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)

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

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

12-6

12-7

12-8

12-9

12-11

12-12

12-13

12-16

12-17

12-18

12-19

12-20

13-4

13-5

13-6

13-7

13-8

13-9

13-10

13-12

13-13

13-14

Contents-9

Low Voltage Supplies

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

13-15

Buck Regulator Control Loop

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

13-15

High Voltage Supplies

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

13-15

CRT Supply Dropping Out

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

13-16

Buck Regulator Control

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

13-17

DC-DC Converter Control

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

13-17

Power Up

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

13-18

A. Component-Level Information Packets

Index

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

Bandpass

Adjustment Setup

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

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

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

2-

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

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

4-

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

AlAl

Wl

Cable Placement

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

4-l 1. A6 Power Supply Connections

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

4-12. Power Supply Cover

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

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.

4-14.

4-15.

4-16.

4-17.

4-18.

4-19.

4-20.

4-21.

4-22.

4-23.

4-24.

4-25.

4-26

1.

4-27

4-28

5-l

5-2

5-3

5-4

5-5

5-6

6-l

6-2

6-3

6-4

6-5.

6-6.

6-7.

6-8.

6-9.

7-l.

7-2.

7-3.

7-4.

7-5.

7-6.

7-7.

8-l.

8-2.

8-3.

9-l.

9-2.

9-3.

9-4.

9-5.

9-6.

9-7.

9-8.

9-9.

9-10.

/

Al6 Fast ADC and Al7 CRT Driver Mounting Screws

..........

HP 85623 Assembly Locations

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

A9 Mounting Screw at Right Side Frame

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

A10 Mounting Screws

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

HP 85623 All Mounting Screws at Right Side Frame

..........

Al4 and Al5 Assembly Removal

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

Al4 and Al5 Assembly Cables

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

Al6 and Al7 Mounting Screws

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

Al6 Cable Routing

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

Main Deck Screws

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

A6 Power Supply Cover

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

W3 Dress and Connection to A6 Power Supply

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

Line-Switch Mounting Screw and Cable Dress

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

W3 Cable Connector

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

Side Frame Mounting Screws

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

A21 OCXO Mounting Screws

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

Parts Identification, Assembly Mounting

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

Parts Identification, Cover Assembly

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

Parts Identification, Main Chassis

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

Parts Identification, RF Section

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

Parts Identification, Front Frame

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

Parts Identification, Rear Frame

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

Hinged Assemblies

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

Top View (A2 Unfolded)

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

Top View (A2 and A3 Unfolded)

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

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

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

Bottom View (Al5 Unfolded)

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

Bottom View (Al5 and Al4 Unfolded)

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

Al6 Fast ADC (Option 007)

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

HP 85623 Front End

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

Rear View

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

Assembly Test Points

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

Ribbon Cable Connections (1 of 2)

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

Service Cal Data Menu

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

Functional Sections

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

Phase Lock Loops

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

Simplified Block Diagram

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

Overall Block Diagram (1 of 3)

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

A3 Test Connectors

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

A3 Interface Assembly Block Diagram

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

Fast ADC (Option 007) Block Diagram

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

A4 and A5 Test Connectors

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

IF Section Troubleshooting with the TAM

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

IF Adjust Signature

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

Detailed IF Adjust Signature (1)

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

Detailed IF Adjust Signature (2)

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

Detailed IF Adjust Signature (3)

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

Detailed IF Adjust Signature (4)

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

Detailed IF Adjust Signature (5)

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

Noisy Signature

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

Noise with Correct Shape

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

Contents-12

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

6-5

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

9-25

9-26

9-27

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.

DEFl

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

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

nore Pin Numbers on Mating Connector) . .

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

U304

Pin 13

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

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

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

9-28

9-29

9-30

9-31

9-35

9-36

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

12-21

12-22

12-25

13-2

13-5

13-7

13-19

13-21

Contents-13

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