HP 85662A Instrucciones de funcionamiento

Troubleshooting

and

Repair

Manual

85662A

Spectrum

Analyzer

IF-Display

Section

HEWLETT

PACKARD

HP Part No. 85662-90085

Microfiche Part No. 85662-90086

Printed in USA December 1990

@Copyright Hewlett-Packard Company 1990

permission is prohibited, except as allowed under the copyright laws.

1212 Valley House Drive, Rohnert Park, CA 94928-4999, 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.

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 HP. Buyer shall prepay shipping charges to HP and HP shall pay shipping charges to

return the product to Buyer. However, Buyer shall pay all shipping charges, duties, and taxes

for products returned to HP from another country.

HP warrants that its software and firmware designated by HP for use with an instrument

will execute its programming instructions when properly installed on that instrument. HP

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. HP 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. HP SHALL NOT BE LIABLE FOR ANY DIRECT, INDIRECT, SPECIAL,

INCIDENTAL, OR CONSEQUENTIAL DAMAGES, WHETHER BASED ON

CONTRACT, TORT, OR ANY OTHER LEGAL THEORY.

Assistance

Product maintenance agreements and other customer assistance agreements are available for

Hewlett-Packard products.

For any assistance, contact your nearest Hewlett-Packard

Sales and Service

Ofice.

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 instrument. 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 or loss of life.

Do not proceed beyond a

warning

sign until the indicated conditions are fully

understood and met.

General Safety Considerations

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.

Warning

There are many points in the instrument which can, if contacted, cause personal

injury. Be extremely careful.

Any adjustments or service procedures that require operation of the instrument

with

protective covers removed should be performed only by trained service

personnel.

Caution

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.

Contents

IF-Display Section

General Information

IF Overall Block

Diagram

Al Display Section

A3 Digital Storage

Troubleshooting

A4 IF Section

Troubleshooting

Options

General Parts Listing

Major Assembly and

Component Locations

General information on the contents of the manual, including storage,

shipment, and packaging.

Mnemonic Table, Instrument Bus Pin Connection Table, and Overall

IF Block Diagram.

Al Display Section Troubleshooting information, Block Diagram, and

AlAl

through

AlAlO

service sheets.

A3 Digital Storage Troubleshooting information, Block Diagram, and

A3Al

through A3AlO service sheets.

A4 Section Block Diagram, and

A4Al

through A4AlO service sheets.

Information and service sheets that explain the difference between an

IF-Display Section with an option and a standard IF-Display Section.

Replaceable parts information and parts identification figures.

Major assembly and component locations.

Contents 1

IF-Display

Section

General

Information

IF-Display Section Service

Introduction

This Troubleshooting and Repair Manual contains information for the troubleshooting and

repair of the IF-Display Section of the instrument. This information is combined in service

sheets and indexed with tabs for quick reference.

Instruments Covered by This Manual

HP 85662A IF-Display Sections, serial number prefixes 2403A and above.

Option 067 (1

kHz

to 3 MHz Resolution Bandwidths for the HP 8567A Spectrum Analyzer),

Option 400 (400 Hz operation)

Option 462 (Impulse Bandwidths)

Option H96 (30 Hz-l MHz Resolution Bandwidths)

HP 85662A IF-Display Sections with serial number prefixes below 24038 are covered in both

Volume 3 of the HP 8566A Operating and Service Manual (HP part number 08566-90006) and

Volume 3 of the HP 85688 Operating and Service Manual (HP part number 08568-90012).

How the HP 85662A Is Used

HP 85662A IF-Display Section is used with:

HP 85660B RF Section as the HP 8566B Spectrum Analyzer

HP 85680B RF Section as the HP 8568B Spectrum Analyzer.

Option 462 is used with:

HP 85660B RF Section as the HP 8566B Option 462 Spectrum Analyzer

HP 85680B RF Section as the HP 8568B Option 462 Spectrum Analyzer

Option 067 is used with:

HP 856708 RF Section as the HP 85678 Spectrum Analyzer

Option H96 is used with:

•I HP 85680B Option H96 as the HP 8568B Option E96 Spectrum Analyzer

o HP 85680B Option H44 as the HP 8568B Option E44 Spectrum Analyzer.

IF-Display Section General Information 1

Service Sheets

The service sheets in this manual are organized in alpha-numeric order and are indexed with

tabs to make it easy to locate a specific service sheet. Each of the service sheets contain the

following information:

Circuit Description (where practical)

Troubleshooting Hints (where practical)

Replaceable Parts Lists

Block Diagram (where practical)

Component Location Illustrations

Schematic Diagrams

Repair Procedures

Repair procedures are included for use in removing and replacing assemblies for repair. They

are located in the following sections:

Front-Panel LED Replacement

Tab:

AlAl

Keyboard

Front Panel Removal and Repair

Tab:

AlAl

Keyboard

CRT Replacement

Tab:

AlA

High Voltage Regulator

IF-Display Section Internal Fuse Replacement

Tab:

AlA

f15

V Regulator and High Voltage

Major Assembly and Component Locations

Major assembly and component location illustrations for the IF-Section are located at the rear

of this manual.

Troubleshooting

Troubleshooting information for the IF-Section is divided into two levels as follows:

Section Level

IF Overall Block Diagrarn

Al Display Section Block Diagram

A3 Digital Storage Troubleshooting

A4 IF-Section Troubleshooting

Assembly Level

Most assemblies have troubleshooting hints immediately following their circuit

descriptions. Troubleshooting information is also located on assembly-level block

diagrams, notes, and schematics.

2 If-Display Section General Information

All assemblies are indexed by tab except for the ones listed in Table 1 at the end of this

section. Table 1 lists the index tabs where these assemblies can be found.

Assembly Locations

Assembly

Tab Location

AlA

Rectifier, Block Diagram

General Parts Listing, Table 6

AlVl

AlAll

AlA

High Voltage Regulator, Block Diagram

General Parts Listing, Table 6

AlA

High Voltage Regulator, Block Diagram

General Parts Listing, Table 4

Not Assigned

Storage and Shipment

Environment

The instrument may be stored or shipped in environments within the following limits:

Temperature

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

Humidity

..-40’Ct

+75OC

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

..5%t

90% at

0”to

40°C

Altitude

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

.Up

to 15,240 meters (50,000 feet)

The instrument should be protected from temperature extremes which might cause

condensation within the instrument.

Original Packaging

It is recommended that the original factory packaging materials be retained for use when

shipping the instrument. If original packaging material cannot be retained, packaging

materials identical to those used in factory packaging are available through Hewlett-Packard

offices. Part numbers and descriptions of the packaging materials are listed in Figure 1.

The combined weight of the two instrument sections is approximately 50 kg (112 lbs).

Because of the weight involved, do not package the instrument sections fastened together as

one unit. The instrument sections must be separated and packaged in separate containers.

The quantity of packaging materials in Figure 1 is for only one instrument section.

If the instrument is being returned to Hewlett-Packard for servicing, attach a tag to each

carton indicating the type of service required, return address, model number, and full serial

number. For your convenience, a supply of tags is included at the end of this section. Also,

mark each container FRAGILE to assure careful handling. In any correspondence, refer to the

instrument by model number and full serial number.

Other Packaging

If it is necessary to use packaging materials other than the type used in original factory

packaging, the following general instructions should be followed.

IF-Display Section General Information 3

1. Separate the two instrument sections and wrap each in heavy paper or plastic.

2. Place the instrument sections in separate containers with 8 to 10 cm (3 to 4 inches) of

shock-absorbing material around all sides to provide firm cushioning and prevent movement

inside the container. Protect front panels with cardboard. Double-wall corrugated cartons

of 125 kg (275 lb) bursting strength are sufficient for shipping containers.

3. Seal each container securely and, if shipping to a Hewlett-Packard office or service center,

attach a tag to each container indicating the type of service required, return address, model

number, and full serial number. For your convenience, a supply of tags is included at the

end of this section.

4. Mark each container FRAGILE to assure careful handling.

TEM

QTY

PART

NO.

921

l-4487

5180-2319

180-2320

DESCRIPTION

OUTER BOX

INNER FOAM PAD

INNER BOX

Figure 1. Packaging for Shipment Using Factory Packaging Materials

4 IF-Display Section General Information

Overall

Block

Diagram

Table 1. A3 Digital Storage Mnemonic

Table

Mnemonic Description Mnemonic Description

184MHZ

LO 18.4

MHz

Local

Oscillator

Signal

LDRMP

Load

Ramp

[MHZ

MHz

ADC

Clock

LDSR

LOW

Digital

Storage

Ready

21.4MHZ

21.4

MHz

Signal

LDX

Load

Position

MHZ 3

MHz

Signal

LDY

Load

Position

LOG

Log

Expand

Control

LFSEN

LOW

Fast

Sweep

Enable

All

Accumulator

Bus

Bits

through

10 Linear

Gain

Controls

AlOdB Attenuation

Controls

LG20

A20dB LGCLK

200

kHz

Line

Generator

Clock

A2dB

LGX

Line

Generator

Horizontal

Signal

A4dB

LGY

Line

Generator

Vertical

Signal

AMB

LINCRSA

Increment

Stroke

Address

ADRO Instrument

Bus

Address

Bits

through

LINTG

LOW

Integrator

Control

ADR3 LL Long

Line

AUX

BLANK

Auxiliary

Blanking

Output

LLGBLANK

LOW

Line

Generator

Blanking

Control

4ux

Auxiliary

Axis

Output LLL

LOW

Long

Line

4VdB Attenuation

Control

LMEMEN

LOW

Enable

Memory

Output

LOG

Log

Expand

Control Log/Linear

Control

BCI

Bll

Digital

Storage

Bus

Data

Bits

through

LOW

Selected

Qualifier

BLO

BL6

Branch

Length

Bus

Bits

through

LROMEN

LOW

ROM

Enable

BLINK Blink

CRT

Display

Control

LRSTO

LOW

Reset

Trigger

Occurred

BRIGHT

Bright

CRT

Display

Control LRTN

LOW

Enable

Interrupt

Return

Block

Switch

Control LRTRC

LOW

Retrace

Signal

BWS Bandwidth

Controls

LTlo

LOW=

IF-Display

Section

l/O

Strobe

BW63 LTON

LOW

Turn

BW68

LTSTA

LOW

Input

Test

Data

BW7

LTSTB

LOW

Input

Test

Data

Memory

Chip

Enable

LWRITE

Memory

Write

Control

ZHAR

Character

Mode

Display

Control

LZERO

Output

Zero

Check

ALU

Result

>LK

MHz

System

Clock

MAO-MA11

Memory

Address

Bus

Bits

through

IF Overall Block Diagram

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