Anritsu MT8820A User manual

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

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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)
Copyright © 2001-2002, ANRITSU CORPORATION.
All rights reserved. No part of this manual may be reproduced without the prior written permission of the
publisher.
The contents of this manual may be changed without prior notice.
Printed in Japan
DANGER
WARNING
CAUTION

For Safety
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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

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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.

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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.

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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
11
1 General
GeneralGeneral
General
1-
1-1-
1-1
11
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-
1-2
22
2.
..
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Section
SectionSection
Section 2 Circuit Description
2 Circuit Description2 Circuit Description
2 Circuit Description
2-
2-2-
2-1
11
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
22
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.