Anritsu MT8820A Manuale utente

Document No.: M-W1940BE-3.0

Measurement Solutions

ANRITSU CORPORATION

To ensure that this equipment is used safely, impor-

tant safety items are explained in the MT8820A Op-

eration Manual. This document explains important

service items related to service. Read both the op-

eration manual and this document, and keep both

with the MT8820A.

MT8820A

Radio Communication Analyzer

Service Manual

Third Edition

iiii

Safety Symbols

To prevent the risk of personal injury or loss related to equipment malfunction, Anritsu Corporation uses the following

safety symbols to indicate safety-related information. Insure that you clearly understand the meanings of the sym-

bols BEFORE using the equipment.

Some or all of the following five symbols may not be used on all Anritsu equipment. In addition, there may be other

labels attached to products which are not shown in the diagrams in this manual.

Symbols used in manual

This indicates a very dangerous procedure that could result in serious injury or

death if not performed properly.

This indicates a hazardous procedure that could result in serious injury or death if

not performed properly.

This indicates a hazardous procedure or danger that could result in light-to-severe

injury, or loss related to equipment malfunction, if proper precautions are not taken.

Safety Symbols Used on Equipment and in Manual

The following safety symbols are used inside or on the equipment near operation locations to provide information

about safety items and operation precautions. Insure that you clearly understand the meanings of the symbols

and take the necessary precautions BEFORE using the equipment.

This indicates a prohibited operation. The prohibited operation is indicated sym-

bolically in or near the barred circle.

This indicates an obligatory safety precaution. The obligatory operation is indicat-

ed symbolically in or near the circle.

This indicates warning or caution. The contents are indicated symbolically in or

near the triangle.

This indicates a note. The contents are described in the box.

These indicate that the marked part should be recycled.

MT8820A

Radio Communication Analyzer

Service Manual

20 August 2001 (First Edition)

20 March 2002 (Third Edition)

publisher.

The contents of this manual may be changed without prior notice.

Printed in Japan

DANGER

WARNING

CAUTION

For Safety

iii

iiiiii

iii

For safety, do not open the equipment covers.

If repair is required, contact the sales representative, branch office, or

agent at the telephone number and address given in this document or in

the equipment operation manual.

Although not recommended by Anritsu Corporation, if it is really impera-

tive to open the covers for emergency repair, take great care not to touch

any dangerous parts.

Always request repair by a trained engineer who understands the haz-

ards.

Anritsu Corporation will not accept liability for any injuries sustained as a

result of opening the equipment covers.

CAUTION

Before changing the fuses, ALWAYS remove the power cord from the

poweroutlet and replace the blown fuses. ALWAYS use new T6.3A

fuses.

T6.3A indicates a time-lag fuse.

6.3A or F6.3A indicate a normal fusing type fuse.

There is risk of receiving a fatal electric shock if the fuses are replaced

with the power cord connected.

Changing Fuse

iviv

Trademark

MS, Microsoft, MS-DOS, Windows and Visual Basic are registered

trademarks of Microsoft Corporation.

IBM and AT are registered trademarks of International Business Machi-

nes Corporation.

About This Manual

The MT8820A Radio Communication Analyzer Service Manual describes

how to locate a faulty module of MT8820A in trouble and repair it by mod-

ule replacement. It does not mention repairing the faulty module itself.

This manual is prepared for service men of Anritsu or its agencies who

have completed the necessary training courses and have complete under-

standing about the danger of fire or electric shock.

IIII

II.

Table of Contents

For Safety ................................................... iii

About This Manual ....................................... I

Section 1 General...................................... 1-1

Section 2 Circuit Description ................... 2-1

2.1 Outline........................................................................... 2-2

2.2 Circuit Description of Each Unit .................................... 2-15

Section 3 Troubleshooting ....................... 3-1

3.1 Outline........................................................................... 3-2

3.2 Service Kits ................................................................... 3-2

3.3 Instruments Required for Troubleshooting ................... 3-5

3.4 Circuit Reference .......................................................... 3-6

3.5 Overall Troubleshooting................................................ 3-7

Section 4

Adjustment and Compensation.....

4-1

4.1 Outline........................................................................... 4-2

4.2 Instruments Required for Adjustment

and Compensation........................................................ 4-3

4.3 Change Parts on A01 MAIN CPU UNIT ....................... 4-4

4.4 Carrier Leak Adjustment ............................................... 4-5

4.5 Output Level and Input Frequency Character

Compensation............................................................... 4-8

4.6 FM Deviation Adjustment.............................................. 4-9

Section 5 Mechanical Configuration

.........

5-1

5.1 Outline........................................................................... 5-2

5.2 Cabinet and Shield Case Assembly ............................. 5-3

5.3 Main Unit Removal........................................................ 5-5

5.4 Built-in Option Unit ........................................................ 5-9

5.5 Parts Lists ..................................................................... 5-11

Section

SectionSection

Section 1

1 General

GeneralGeneral

General

1-1-

1-1

This service manual explains how to maintain the MT8820A Radio Com-

munication Analyzer. Section 1 describes the configuration of this man-

ual.

Section 1 General

Describes the service manual configuration.

Section 2 Circuit Description

Describes the MT8820A circuit operations and the role of each unit

using block diagrams.

Section 3 Troubleshooting

Explains how to locate faulty parts when a problem has occurred in

the MT8820A.

Section 4 Adjustment And Compensation

Describes the adjustment and compensation procedures to be carried

out after troubleshooting.

Section 5 Mechanical Configuration

Presents the parts list used for troubleshooting or parts replacement

and explains how to remove the parts.

Section 1

Section 1Section 1

Section 1

General

GeneralGeneral

General

1-1-

1-2

Section

SectionSection

Section 2 Circuit Description

2 Circuit Description2 Circuit Description

2 Circuit Description

2-2-

2-1

2.1 Outline ....................................................................... 2-2

2.1.1 Outline of Circuitry......................................... 2-2

2.1.2 Power Line Description ................................. 2-9

2.1.3 Signal Lines Description................................ 2-10

2.2 Circuit Description of Each Unit................................. 2-15

2.2.1 A01 Main CPU Unit ....................................... 2-15

2.2.2 A41, A42 WCDMA COM Unit........................ 2-18

2.2.3 A51, A52 WCDMA BB Unit ........................... 2-21

2.2.4 A61, A62 MEAS DSP Unit............................. 2-23

2.2.5 A02 DAC/ADC Unit ....................................... 2-27

2.2.6 A71, A72 RF Unit .......................................... 2-30

2.2.7 A7101, A7201 Input LPF ............................... 2-33

2.2.8 A7102, A7202 Output AMP........................... 2-33

2.2.9 A7103, A7203 RF.......................................... 2-33

2.2.10 A7104, A7204 IF ........................................... 2-33

2.2.11 A81, A82 Local Unit....................................... 2-34

2.2.12 A04 Reference Unit ....................................... 2-39

2.2.13 A05 Mother Board ......................................... 2-43

2.2.14 A07 Panel Control Unit.................................. 2-44

2.2.15 Power Supply Unit......................................... 2-47

2.2.16 A21, A22 TDMA COM Unit............................ 2-48

2.2.17 A03 AUDIO Unit ............................................ 2-53

Section 2 Circuit Description

Section 2 Circuit DescriptionSection 2 Circuit Description

Section 2 Circuit Description

2-2-

2-2

2.1 Outline

This section explains the unit configuration of the MT8820A and the block

diagram for each unit.

2.1.1 Outline of Circuitry

Table 2-1 gives the unit outline and Figure 2-1 shows the overall block

diagram.

Table 2-1 Outline of Circuitry

A No. Name Description

A01 MAIN CPU •The main CPU unit provides functions to

control the entire system such as MMI and

hardware control.

•The main CPU unit mounts two processors:

PPC750 CPU and TI-C5420 DSP.

•The PPC750 CPU is for MMI and hardware

control and TI 5420 DSP is for analog

hardware control.

A21

A22

TDMA COM •The TDMA COM unit performs the TDMA-

system Layer 1 to 3 processing.

•This unit mounts one MPU and four DSP to

correspond to various communication

systems by replacing the software.

A31

A32

CDMA2K COM •(Development scheduled)

A41

A42

WCDMA COM •In collaboration with the A51/A52 WCDMA

BB unit, provides the WCDMA call

processing function.

•Performs WCDMA Layer 2 and 3 processing,

Layer 1 frame CODEC processing, coding

processing, etc.

A51

A52

WCDMA BB •Spreader

Performs spreading processing for downlink

transmission data from the A41/A42

WCDMA COM unit.

•Despreader

Performs IQ demodulation and despreading

processing for uplink IF signal and transmits

the results to the WCDMA COM unit.

A61

A62

MEAS DSP •Acquires the AD-sampled signal to be

measured, analyzes it according to the MAIN

CPU instructions and sends the results to the

MAIN CPU.

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