Anritsu MS2681A Manuale utente

MS2681A/MS2683A/MS2687A

Spectrum Analyzer

Service Manual

To ensure that this equipment is used safety, important

safety items are explained in the MS2681A/83A/87A

Operation Manual. This document explains important

service items related to service. Read both the

operation manual and this document, and keep both

with the MS2681A/83A/87A.

Second Edition

Measurement Solutions

ANRITSU CORPORATION

Document No.: M-W1754BE-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 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 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 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

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.

MS2681A/83A/87A

Spectrum Analyzer

Service Manual

16 June 2000 (First Edition)

12 October 2001 (Second Edition)

publisher.

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

Printed in Japan

Safety Symbols

DANGER

WARNING

CAUTION

iii

For Safety

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 imperative 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.

Trademark

MS, Microsoft, MS-DOS, Windows and Word98 are the registered

trademarks of Microsoft Corporation US in the US and other countries.

IBM and AT are the registered trademarks of International Business

Machines Corporation.

NI-488.2TM is a registered trademark of National Instruments

Corporation.

Power Line Fuse Protection

For safety, Anritsu products have either one or two fuses in the AC power lines as

requested by the customer when ordering.

Single fuse: A fuse is inserted in one of the AC power lines.

Double fuse: A fuse is inserted in each of the AC power lines.

Example: An example of the double fuse is shown below:

Fuse Holders

About This Manual

This Service Manual for the MS268*A Spectrum Analyzer provides the trouble-

shooting instructions on how to identify and replace the faulty modules. Instruc-

tions on repairing module's internal parts are beyond the scope of this manual.

This service manual is written for both our own and our dealer's service personnel

who have completed a prescribed training course and are aware of the danger of

fire and electrical shock and other accidents.

“MS268*A” in the main chapter means “MS2681A/83A/87A”.

II.

Table of Contents

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

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

Section 1 Description of Module Operation 1-1

1.1 Outline........................................................................... 1-2

1.2 List of Replacement Modules........................................ 1-21

1.3 Module Operation.......................................................... 1-23

Section 2 Troubleshooting........................ 2-1

2.1 Troubleshooting Flow.................................................... 2-3

2.2 Mechanical Configuration ............................................. 2-5

2.3 Check after Module Replacement................................. 2-33

Section 3 Adjustment and Calibration...... 3-1

3.1 Service Kit ..................................................................... 3-2

3.2 Required Equipment ..................................................... 3-2

3.3 Sweep Adjustment ........................................................ 3-3

3.4 YTF D/A Adjustment (for MS2683A)............................. 3-5

3.5 YTF D/A Adjustment (for MS2687A)............................. 3-6

3.6 YTF Adjustment (for MS2683A or MA2687A)............... 3-7

3.7 CAL OSC Adjustment ................................................... 3-9

3.8 IF Gain2 Adjustment (for MS2683A or MA2687A)........ 3-10

3.9 Maintenance Mode........................................................ 3-12

3.10 Frequency Characteristics Compensation .................... 3-13

3.11 Internal Calibration ........................................................ 3-17

3.12 Installing Software......................................................... 3-19

3.13 Mechanical Switch Counter Setting .............................. 3-20

Section 1 Description of Module Operation

1-1

1.1 Outline ....................................................................... 1-2

1.1.1 Outline for MS2681A ................................................. 1-2

1.1.2 Outline for MS2683A ................................................. 1-4

1.1.3 Outline for MS2687A ................................................. 1-6

1.2 List of Replacement Modules .................................... 1-21

1.2.1 List of Replacement Modules for MS2681A .............. 1-21

1.2.2 List of Replacement Modules for MS2683A .............. 1-21

1.2.3 List of Replacement Modules for MS2687A .............. 1-22

1.3 Module Operation ...................................................... 1-23

Section 1 Description of Module Operation

1-2

1.1 Outline

1.1.1 Outline for MS2681A

Please refer to Fig. 1-1 Overall Block Diagram.

The MS2681A is a superheterodyne system scanning-type spectrum analyzer.

For RF input after passing through the 8 GHz STEP ATTENUATOR frequency of 9

kHz to 3.0 GHz the signal pass through the Coaxial LPF and then to A10 3 GHz

CONVERTER.

In the A10 3 GHz CONVERTER, RF input signal gets mixed with first Local

Oscillator signal to generate a 4060.69 or 4066 MHz first IF signal by first mixer.

After passing several filters and amplifier, First IF signal gets mixed with second

Local Oscillator signal (4000 MHz) to generate a 60.7 or 66 MHz second IF signal

by second mixer, and fed to A06 IF.

The first Local signal generated at YTO (YIG tuned oscillator) is frequency-swept by

scan signal from A05 SCAN/AD after phase-lock to reference signal (its frequency is

26 to 32 MHz) generated on A08 LOCAL02 at the center frequency of its sweeping

range, in normal sweep condition.

The YTO output is passed through an amplifier, and then divided into two paths with

a directional coupler. One of divided signal is fed to sampler circuit, sampling

signal (its frequency is 194 to 206 MHz) generated on A08 LOCAL02 is frequency

multiplied, and mixed with YTO output to generate sampler IF signal with a

frequency of 26 to 32 MHz.

The 4-GHz second local signal is phase-locked to 100-MHz VCXO signal, of which

the frequency is also phase-locked to 10-MHz crystal oscillator.

In the instrument, high accuracy 625-kHz/50-MHz signals are present for calibration.

These signals are generated by dividing the reference signal, and the CAL ATT

varies power level of 625-kHz signal with 1-dB steps.

Internal calibration operation being carried out, these calibration signal is fed to RF

signal-route through the switch in 8 GHz STEP ATTENUATOR.

66 MHz second IF signal is selected when resolution band width (RBW) setting is 1,

3, 5, 10, or 20 MHz. For other settings, 60.7 MHz is selected.

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