Anritsu ML8720B User manual

Second Edition
Read this manual before using the equipment.
Keep this manual with the equipment.
ML8720B
W-CDMA Area Tester
Service Manual
Measurement Solutions
ANRITSU CORPORATION
Document No.: M-W1893BE-2.0

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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
symbols BEFORE using the equipment.
Some or all of the symbols may not be used on this equipment. In addition, when drawings are included in this
manual, labels on the equipment may not be shown on them.
Safety Symbols Used in Manual
DANGER
WARNING
CAUTION
Safety Symbols Used on Equipment and/or in Manual
The following safety symbols are used inside or on the equipment near operation locations, and/or in manual 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
symbolically in or near the barred circle.
This indicates an obligatory safety precaution. The obligatory operation is
indicated 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.
ML8720B
W-CDMA Area Tester
Service Manual
23 February 2001 (First Edition)
14 June 2002 (Second 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
This indicates a very dangerous procedure that could result in death or serious
injury if not performed properly.
This indicates a hazardous procedure that could result in death or serious injury
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

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For Safety
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 the document or
in the equipment operation manual.
Although not recommended by Anritsu Corporation, if it is really im-
perative 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
hazards.
Anritsu Corporation will not accept liability for any injuries sustained
as a result of opening the equipment covers.

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For Safety
DANGER
NEVER touch parts where the label shown on the left is attached.
Such parts have high voltages of at least 1 kV and there is a risk of
receiving a fatal electric shock.
WARNING
1. ALWAYS refer to the operation manual when working near loca-
tions at which the alert mark shown on the left is attached. If the
operation, etc., is performed without heeding the advice in the
operation manual, there is a risk of personal injury. In addition,
the equipment performance may be reduced.
Moreover, this alert mark is sometimes used with other marks and
descriptions indicating other dangers.
2. When supplying power to this equipment, connect the accessory
3-pin power cord to a 3-pin grounded power outlet. If a grounded
3-pin outlet is not available, before supplying power to the equip-
ment, use a conversion adapter and ground the green wire, or
connect the frame ground on the rear panel of the equipment to
ground. If power is supplied without grounding the equipment,
there is a risk of receiving a severe or fatal electric shock.
3. This equipment cannot be repaired by the user. DO NOT attempt
to open the cabinet or to disassemble internal parts. Only Anritsu-
trained service personnel or staff from your sales representative
with a knowledge of electrical fire and shock hazards should ser-
vice this equipment. There are high-voltage parts in this equip-
ment presenting a risk of severe injury or fatal electric shock to
untrained personnel. In addition, there is a risk of damage to pre-
cision parts.
HIGHVOLTAGE/高電圧
DANGER/感電警告
or
Repair
WARNING

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For Safety
WARNING
4. This equipment should be used in the correct position. If the cabi-
net is turned on its side, etc., it will be unstable and may be dam-
aged if it falls over as a result of receiving a slight mechanical
shock.
5. When replacing the battery, use the specified battery and insert it
with the correct polarity. If the wrong battery is used, or if the
battery is inserted with reversed polarity, there is a risk of explo-
sion causing severe injury or death.
6. DO NOT short the battery terminals and never attempt to disas-
semble it or dispose of it in a fire. If the battery is damaged by any
of these actions, the battery fluid may leak.
This fluid is poisonous.
DO NOT touch it, ingest it, or get in your eyes. If it is accidentally
ingested, spit it out immediately, rinse your mouth with water and
seek medical help. If it enters your eyes accidentally, do not rub
your eyes, irrigate them with clean running water and seek medi-
cal help. If the liquid gets on your skin or clothes, wash it off care-
fully and thoroughly.
7. This instrument uses a Liquid Crystal Display (LCD); DO NOT
subject the instrument to excessive force or drop it. If the LCD is
subjected to strong mechanical shock, it may break and liquid
may leak.
This liquid is very caustic and poisonous.
DO NOT touch it, ingest it, or get in your eyes. If it is ingested
accidentally, spit it out immediately, rinse your mouth with water
and seek medical help. If it enters your eyes accidentally, do not
rub your eyes, irrigate them with clean running water and seek
medical help. If the liquid gets on your skin or clothes, wash it off
carefully and thoroughly.
Falling Over
Replacing Battery
Battery Fluid
LCD

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CAUTION
This equipment uses a lithium battery to back-up the memory. This
battery must be replaced by a service engineer when it has reached
the end of its useful life; contact the Anritsu sales section or your near-
est representative.
This equipment uses ATA memory cards as external media for stor-
ing data and programs.
If this media is mishandled, important data may be lost. To prevent
this chance occurrence, all important data and programs should be
backed-up.
Anritsu will not be held responsible for lost data.
Pay careful attention to the following points. In particular, never re-
move the ATA memory card from the equipment, while it is being ac-
cessed. For details, refer to the section 2.5.1 in the operation manual
dealing with ATA memory cards.
(ATA memory card)
• ATA memory cards are easily damaged by static electric charges.
(Backup Memory)
• Backup memory is easily damaged by static electric charges.
Note: The battery used in this equipment has a maximum useful life of
7 years. It should be changed before this period has elapsed.
Changing memory
back-up battery
Storage media
For Safety

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Equipment Certificate
Anritsu Corporation certifies that this equipment was tested before shipment us-
ing calibrated measuring instruments with direct traceability to public testing or-
ganizations recognized by national research laboratories including the
Electrotechnical Laboratory, the National Research Laboratory of Metrology and
the Communications Research Laboratory, and was found to meet the published
specifications.
Anritsu Warranty
Anritsu Corporation will repair this equipment free-of-charge if a malfunction
occurs within 1 year after shipment due to a manufacturing fault, provided that
this warranty is rendered void under any or all of the following conditions.
• The fault is outside the scope of the warranty conditions described in the op-
eration manual.
• The fault is due to mishandling, misuse, or unauthorized modification or repair
of the equipment by the customer.
• The fault is due to severe usage clearly exceeding normal usage.
• The fault is due to improper or insufficient maintenance by the customer.
• The fault is due to natural disaster including fire, flood, earthquake, etc.
• The fault is due to use of non-specified peripheral equipment, peripheral parts,
consumables, etc.
• The fault is due to use of a non-specified power supply or in a non-specified
installation location.
In addition, this warranty is valid only for the original equipment purchaser. It is
not transferable if the equipment is resold.
Anritsu Corporation will not accept liability for equipment faults due to unfore-
seen and unusual circumstances, nor for faults due to mishandling by the cus-
tomer.
Anritsu Corporation Contact
If this equipment develops a fault, contact Anritsu Corporation or its representa-
tives at the address in this manual.

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Trademark
MS-DOS is a registered trademark of Microsoft Corporation
USA in USA and other countries.
Waste Management Plan
•The electrical circuit of this equipment contains arsenic.
The user must comply with the regulations of his country/
district for the disposal of the equipment.
•This equipment uses lithium batteries. The user must com-
ply with the regulations of his country/district for their dis-
posal.
Please contact ANRITSU or the sales representatives of
Anritsu if there are any doubts or questions about the dis-
posal of waste.

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About This Manual
This is the service manual of the ML8720B W-CDMA Area Tester for smooth
maintenance and service work of the service personnel, and not be supplied to
customers.
Refer to the separate operation manual (an accessory supplied to the equipment)
for handling the instruments.
Our basic policy to the repair is return to the factory system, i.e. the defective
instrument should be returned to Anritsu for repair.
However, it may be time consuming and some kinds of repairs can be easily done
in the field.
Therefore, Anritsu allows only those whom Anritsu has authorized to open the
instrument and repair it.
As clearly stated in the WARRANTY statement, any unauthorized modification,
repair, or attempt to repair will render the warranty void.

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Table of Contents
For Safety ...................................................... iii
About This Manual ........................................ I
Section 1 General......................................... 1-1
1.1 Introduction ................................................................ 1-2
1.2 Safety Precautions..................................................... 1-2
Section 2 Preparation .................................. 2-1
2.1 Introduction ................................................................ 2-2
2.2 Precautions................................................................ 2-2
2.3 Installing and Removing the Unit and
the Battery Pack ........................................................ 2-3
Section 3 Troubleshooting.......................... 3-1
3.1 Introduction ................................................................ 3-2
3.2 Recommended Test Equipment ................................ 3-2
3.3 Overall Circuit Description ......................................... 3-3
3.4 Detecting Faulty Module ............................................ 3-7
3.5 Replacement of Faulty Module .................................. 3-12
3.6 Adjustment After Module Replacement ..................... 3-13
3.7 Compensation............................................................ 3-13
3.8 Performance Test ...................................................... 3-16
Section 4 Removing the Exchange Module
in the Unit .................................... 4-1
4.1 List of the Exchange Module/Registry ....................... 4-2
4.2 Removing the Exchange Module
in the Measurement Unit............................................ 4-3
4.3 Removing the Exchange Module
in the Display Unit...................................................... 4-13