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

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)

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

iii

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.

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

Repair

WARNING

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

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

vii

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.

viii

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.

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.

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

Table of contents

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