ANRITSU MN4790A, ME7842B Schematic

MODEL

MN4790A TEST SET FOR THE

ME7842B

TOWER MOUNTED AMPLIFIER TEST SYSTEM

MAINTENANCE MANUAL

490 JARVIS DRIVE l MORGAN HILL, CA 95037-2809

P/N: 10410-00245

REVISION: A

PRINTED: MARCH 2003

WARRANTY

The Anritsu product(s) listed on the title page is (are) warranted against defects in materials and workmanship for three years from the date of shipment. Anritsu’s obligation covers repairing or replacing products which prove to be defective during the warranty period. Buyersshall prepaytransportation chargesfor equipment returned to Anritsu for warranty repairs. Obligation is limited to the original purchaser. Anritsu is not liable for consequential damages.

LIMITATION OF WARRANTY

The foregoing warranty does not apply to Anritsu connectors that have failed due to normal wear. Also,the warranty does not apply to defects resulting from improper or inadequate maintenance by the Buyer, unauthorized modification or misuse, or operation outside of the environmental specifications of the product.No otherwarranty isexpressed or implied, andthe remedies provided herein are the Buyer’s sole and exclusive remedies.

TRADEMARK ACKNOWLEDGEMENTS

Scorpion and Scorpion Navigator are registered trademarks of Anritsu Company. Windows is a registered trademark of Microsoft Corporation.

NOTICE

Anritsu Company has prepared this manual for use by Anritsu Company personnel and customers as a guide for the proper installation, operation and maintenance of Anritsu Company equipment and computer programs. The drawings, specifications, and information contained herein are the property of Anritsu Company, and any unauthorized use or disclosure of these drawings, specifications, and information is prohibited; they shall not be reproduced,copied, or used in whole or in part as the basis for manufacture or sale of the equipment or software programs without the prior written consent of Anritsu Company.

Symbols used in manuals

Safety Symbols

To prevent the risk of personal injury or loss related to equipment malfunction, ANRITSU Company uses the following symbols to indi cate safety-related information. For your own safety, please read this information carefully BEFORE operating the equipment.

DANGER

Indicates a very dangerous procedure that could result in serious in jury or death if not performed properly.

WARNING Indicates a hazardous procedure that could result in serious injury or

death if not performed properly.

CAUTION 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 Manuals

Some or all of the following five symbols may or may not be used on all ANRITSU equipment. In addition, there may be other labels attached to products that are not shown in the diagrams in this manual.

The following safety symbols are used inside or on the equipment near operation locations to provide information about safety items and op eration precautions. Ensure that you clearly understand the meanings of the symbols and take the necessary precautions BEFORE operating the equipment.

This symbol indicates a prohibited operation. The prohibited operation is indicated symbolically in or near the barred circle.

This symbol indicates a compulsory safety precaution. The required operation is indicated symbolically in or near the circle.

This symbol indicates warning or caution. The contents are indicated symbolically in or near the triangle.

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

These symbols indicate that the marked part should be recycled.

MN4790A MM Safety-1

For Safety

WARNING

Always refer to the operation manual when working near locations 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.

Repair

WARNING

Moreover, this alert mark is sometimes used with other marks and descrip tions indicating other dangers.

WARNING

When supplying AC 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, use a conversion adapter and ground the green wire, or connect the frame ground on the rear panelof the equipment to ground. If power is supplied without grounding the equipment, there is a risk of receiving a severe or fatal electric shock.

WARNING

This equipment cannot be repaired by the operator. DO NOT attempt to re move the equipment covers or to disassemble internal components. Only qualified service technicians with a knowledge of electrical fire and shock hazards should service this equipment. There are high-voltageparts in this equipment presenting a risk of severe injury or fatal electric shock to un trained personnel. In addition, there is a risk of damage to precision com ponents.

WARNING

If this equipment is used in a manner not specified by the manufacturer, the protection provided by the equipment may be impaired.

Safety-2 MN4790A MM

Chapter 1 General Information

1-1 SCOPE OF MANUAL .......................1-1

1-2 INTRODUCTION .........................1-1

1-3 IDENTIFICATION NUMBER ..................1-1

1-4 ONLINE MANUAL ........................1-1

1-5 TMATS SYSTEM OVERVIEW ..................1-2

1-6 HARDWARE DESCRIPTION...................1-2

1-7 SYSTEM DESCRIPTION .....................1-2

MS4623B VNMS ·······················1-2

MN4790A Test Set ······················1-3

1-8 RECOMMENDED TEST EQUIPMENT .............1-6

1-9 STATIC SENSITIVE

COMPONENT HANDLING PROCEDURES...........1-6

1-10 SERVICE CENTERS .......................1-8

Chapter 2 Replaceable Parts

2-1 INTRODUCTION .........................2-1

2-2 EXCHANGE ASSEMBLY PROGRAM ..............2-1

2-3 REPLACEABLE SUBASSEMBLIES AND PARTS .......2-2

2-4 PARTS ORDERING INFORMATION ..............2-2

Chapter 3 Performance Verification Procedure

3-1 INTRODUCTION .........................3-1

3-2 CONVENTIONS..........................3-1

3-3 PRELIMINARY ..........................3-1

MS4623B VNMS ·······················3-1

ME7842B TMATS ······················3-2

Required Equipment·····················3-2

Preliminary Setup ······················3-2

3-4 DIRECTIVITY AND TEST PORT MATCH............3-5

Test Procedure ························3-5

3-5 DYNAMIC RANGE........................3-11

Test Procedure ·······················3-11

MN4790A MM i

3-6 IMD MEASUREMENT......................3-14

Test procedure ·······················3-14

Chapter 4 Troubleshooting

4-1 INTRODUCTION .........................4-1

4-2 OPERATIONAL CHECK .....................4-1

Required Equipment·····················4-1

4-3 INTERNAL SIGNAL PATH INSERTION LOSS CHECK....4-1

Test Setup ··························4-1 Test Procedure ························4-2

4-4 TEST CHANNEL STEP ATTENUATOR CHECK ........4-4

Test Setup ··························4-4 Test Procedure ························4-4

4-5 TROUBLESHOOTING ......................4-6

Test Set Fails to Power Up··················4-6 Line Source and Interface Checks··············4-6 Power Supply Voltage Check ················4-6

Chapter 5 Removal and Replacement Procedures

5-1 INTRODUCTION .........................5-1

5-2 EQUIPMENT REQUIRED ....................5-1

5-3 REMOVING THE COVERS....................5-1

Preliminary··························5-1

Procedure···························5-1

5-4 A1 GPIB PARALLEL INTERFACE PCB .............5-4

5-5 A2 COMBINER ..........................5-5

5-6 A3 STEP ATTENUATOR .....................5-6

5-7 A4 AND A5 BIAS TEES......................5-7

5-8 A6 POWER SUPPLY .......................5-8

5-9 A7 CONTROL PCB .......................5-10

5-10 FAN ASSEMBLY.........................5-11

5-11 SP3T AND SPDT SWITCHES..................5-12

ii MN4790A MM

Appendix A Connector Maintenance Check Procedures

A-1 INTRODUCTION .........................A-1

A-2 PRECAUTIONS ..........................A-1

Pin Depth Problems ·····················A-1 Pin Depth Tolerance·····················A-2 Avoid Over Torquing Connectors ··············A-2 Teflon Tuning Washers ···················A-2 Avoid Mechanical Shock ··················A-2 Keep Connectors Clean ···················A-3 Visual Inspection ······················A-3

A-3 REPAIR AND MAINTENANCE .................A-3

Index

MN4790A MM iii/vi

Chapter 1 General Information

1-1 SCOPE OF MANUAL This manual provides general service and preventive maintenance

information for the Anritsu MN4790A test set for the ME7842B Tower Mounted Amplifier Test System.It contains procedures for:

Testing the instrument for proper operation

Verifying measurement accuracy and traceability to National In

stitute of Standards and Technology (NIST)

Troubleshooting a failed instrument to the exchange subassem

bly level or to the subsystem requiring adjustment Locating and replacing failed parts

Throughout this manual, the terms ME7842B and Tower Mounted Amplifier Test System (or TMATS) will be used interchangeably to re-

fer to the entire ME7842B Tower Mounted Amplifier Test System;the terms MS4623B, Vector Network Measurement System (or VNMS), and

Scorpion Vector Network Measurement System; the terms MN4790A and test set will be used interchangeably to refer to the model MN4790A test

set, unless otherwise noted.

will be used interchangeably to refer to the model MS4623B

1-2 INTRODUCTION This chapter provides a general description of the T owerMounted

Amplifier Test System’ sserial numbers ,frequency ranges, and related manuals.It alsoincludes a service strategy,availableservice facilities , static-sensitive component handling precautions, and a list of recom mended test equipment.

1-3 IDENTIFICATION

NUMBER

All Anritsu instruments are assigned a six-digit ID number, such as “021001.”This number appears on a decal affixed to the rear panel. Please use this identification number during any correspondence with Anritsu Customer Service about this instrument.

1-4 ONLINE MANUAL This manual is available on CD ROM as an Adobe Acrobat™ (*.pdf)

file. The file can be viewed using Acrobat Reader™, a free program that is also available on the CD ROM. This file is “linked” such that the viewer can choose a topic to view from the displayed “bookmark” list and “jump” to the manual page on which the topic resides.The text can also be word-searched. A copy of this CD ROM can be ordered from Anritsu.

MN4790A MM 1-1

TMATS SYSTEM OVERVIEW GENERAL INFORMATION

1-5 TMATS SYSTEM

OVERVIEW

1-6 HARDWARE

DESCRIPTION

The Anritsu ME7842B Tower Mounted Amplifier Test System is in tended for the measurement and real-time graphical displayof a tower mounted amplifier in the frequency range from 10 MHz to 6 GHz of the following parameters:

S-Parameters Including Hot S

K-Factor

Gain Compression and Phase Distortion

Intermodulation Distortion (500 MHz to 6 GHz)

Harmonics

Noise Figure

Drain Current and Power Added Efficiency (PAE)

Adjacent Channel Power Ratio (ACPR)

The ME7842B hardware (Figure 1-) consists of an MS4623B 3-port Scorpion, an MN4790A test set, and a customer supplied personal computer (PC).

1-7 SYSTEM DESCRIPTION An overall block diagram of the TMATS is shown in Figure 1-2 on

page 1-5.Brief descriptions of the MS4623B 3-port Scorpion and the MN4790A test set are given below:

MS4623B VNMS The Scorpion Vector Network Measurement System functions under

GPIB control of the software residing in the PC. The software supports tuning and alignment operations by generating real time graphical displays of the measured data on the PC screen.

Under software control, 3 sured and displayed. Also, the Upper and Lower Side Band (USB & LSB) components of the IMD products are measured and displayed separately.

The 3-port Scorpion includes the following capabilities:

Two internal,independent RF sources. Each source has a range of –15 dBm to +5 dBm. A 0 dB to 70 dB step attenuator (10 dB-per-step) is provided for each source resulting in a power output range of –85 dBm to +5 dBm from each source.

Complete built-in capability for IMD measurements (A combiner is provided within the test set.)

Complete built-in reflectometer for S-parameter measurements

rd,5th

and 7thorder IMD products can be mea

1-2 MN4790A MM

GENERAL INFORMATION SYSTEM DESCRIPTION

MN4790A Test Set The Series MN4790A test set contains two SPDT pin switches at Test

Port 1 and Test Port 3. One output of each switch is linked to a Wilkinson type combiner that combines the two RF signals from Port 1 and Port 3 of the Scorpion.As an option to boost the input RF power to the amplifier-under-test (AUT), external preamplifiers can be inserted between:

Scorpion Port 1 and the test set Test Port 1

Scorpion Port 3 and the test set Test Port 3

The output of the combiner is fed to a SP3T source selection switch that enables one of the following to be applied to the AUT:

The combined signal from the Scorpion sources

The signal from the Scorpion Source 1 via Port 1

(bypassing the combiner) A modulated signal from an optional, external modulation

synthesizer

The second output of the switch at Test Port 1 is linked to the source selection switch.The second output of the switch at Test Port 3 is linked to the Bypass output port at the front panel.

The output of the source selection switch is fed to a SPDT switch that enables the signal to be routed to the ANT A port or the ANT B port at the front panel.

An SPDT switch multiplexes the signal to and from the RBS A and RBS B ports at the front panel. The output of this switch is linked to a SP3T selection switch that enables the signal to be routed to one of the two AUX Out ports, or via the built-in step attenuator to Test Port 2 of the test set.

The MN4790A front and rear panels are illustrated in Figure 1-1 on the following page. Figure 1-2,on page 1-5, shows an overall block dia gram of the test system.

MN4790A MM 1-3

SYSTEM DESCRIPTION GENERAL INFORMATION

Front Panel

Rear Panel

Figure 1-1. MN4790A Test Set Front and Rear Panel

1-4 MN4790A MM

GENERAL INFORMATION SYSTEM DESCRIPTION

SCORPION

MS4623B

PORT 3 PORT 1 PORT 2

OPTIONAL

EXTERNAL

PREAMPLIFIERS

PORT 3 PORT 1

MN4790A TYPICAL TEST SE T

NOISE SOURCE

SCORPION VNMS

COMBINER

PORT 2

NNN

STEP ATTENUATOR 70 DB , 10 DB /STEP

GPIB

AUX-OUT2

AUX-OUT1

SYSTEM

CONTROLLER

(PC )

OPTIONAL SPECTRUM ANALYZER

MODULATIO N

ANALYZER

OPTIONAL

POWER

METER

RX/TX

NNNNNNN

DC BIAS 1

DC BIAS 2

POWER

SUPPLY

AUX-IN 1 AUX-IN 2

OPTIONAL

MODULATIO N

SYNTHESIZER

BYPASS ANT A ANT B RBS B RBS A

ANT

T YPICA L TM A D EVICE

BPF

LNA

BPF

Figure 1-2. Basic Functional Block Diagram of the Tower Mounted Amplifier Test System (TMATS) with the MN4790A Test Set

MN4790A MM 1-5

RECOMMENDED TEST EQUIPMENT GENERAL INFORMATION

1-8 RECOMMENDED TEST

EQUIPMENT

Table 1-1 lists the recommended test equipment to be used for all maintenance activities for the MN4790A models. Note the “Use”codes listed in the right hand column of the table. These codes list the appli cable maintenance activities for the equipment listed.

Table 1-1. Recommended Test Equipment

INSTRUMENT

Power Meter Anritsu ML2437A or ML2438A Power Sensor Anritsu MA2472A GPIB Cable IEEE 488.2 compliant Anritsu 2100-2, or equivalent Air Line Anritsu 18N50 or SC3833 Short Anritsu 22A50 Offset Termination 20 dB Return Loss Anritsu 29A50-20 Thru Line Return Loss 35 dB, DC to 3 GHz Anritsu 3670NN50-2 or 15NN50-0.6B Calibration Kit Anritsu 3753R or 3753LF Personal Computer Windows 98/2000/XP GPIB Interface IEEE 488.2

* USE CODES:

A Adjustment/ Internal Hardware Calibration O Operational Testing P PerformanceVerification T Troubleshooting

CRITICAL

SPECIFICATION

Any P, T National Instruments PCI-GPIB (Desktop)

National Instruments PCMCIA-GPIB (Notebook)

RECOMMENDED

MANUFACTURER/MODEL

USE*

P P P P P

P P, T P, T

1-9 STATIC SENSITIVE

COMPONENT HANDLING PROCEDURES

The MN4790A test set contains components that can be damaged by static electricity. Figure 1-3,on the following page, illustrates the pre cautions that should be followed when handling static-sensitive subas

semblies and components. If followed, these precautions will minimize the possibilities of static-shock damage to these items.

1-6 MN4790A MM

GENERAL INFORMATION STATIC SENSITIVE COMPONENT HANDLING

PROCEDURES

Do not touch exposed contacts on

any static sensitive component.

Wear a static-discharge wristband

when working with static sensitive components.

Do not slide static sensitive com

ponent across any surface.

Label all static sensitive devices.

Do not handle static sensitive com

ponents in areas where the floor or work surface covering is capable of generating a static charge.

Keep component leads shorted to-

gether whenever possible.

Handle PCBs only by their edges.

Do not handle by the edge connec tors.

Lift & handle solid state devices by

their bodies – never by their leads.

Transport and store PCBs and

other static sensitive devices in static-shielded containers.

10. ADDITIONAL PRECAUTIONS:

Keep work spaces clean and free of any objects capable of holdingor storing a static charge.

Connect soldering tools to an earth ground.

Use only special anti-static suction or wick-type desoldering tools.

Figure 1-3. Static Sensitive Component Handling Procedures

MN4790A MM 1-7

SERVICE CENTERS GENERAL INFORMATION

1-10 SERVICE CENTERS Anritsu offers a full range of repair and calibration services at fully

staffed and equipped service centers throughout the world.Table 1-2 lists all of the Anritsu services centers.

Table 1-2. Anritsu Service Centers

UNITED STATES

ANRITSU COMPANY 490 Jarvis Drive Morgan Hill, CA 95037-2809 Telephone: (408) 776-8300 1-800-ANRITSU FAX: 408-776-1744

ANRITSU COMPANY 10 New Maple Ave., Unit 305 Pine Brook, NJ 07058 Telephone: (973) 227-8999 1-800-ANRITSU FAX: 973-575-0092

ANRITSU COMPANY 1155 E. Collins Blvd Richardson, TX 75081 Telephone: 1-800-ANRITSU FAX: 972-671-1877

AUSTRALIA

ANRITSU PTY. LTD. Unit 3, 170 Foster Road Mt Waverley, VIC 3149 Australia Telephone: 03-9558-8177 FAX: 03-9558-8255

BRAZIL

ANRITSU ELECTRONICA LTDA. Praia de Botafogo, 440, Sala 2401 CEP22250-040, Rio de Janeiro, RJ, Brasil Telephone: 021-527-6922 FAX: 021-53-71-456

FRANCE

ANRITSU S.A 9 Avenue du Quebec Zone de Courtaboeuf 91951 Les Ulis Cedex Telephone: 016-09-21-550 FAX: 016-44-61-065

GERMANY

ANRITSU GmbH Grafenberger Allee 54-56 D-40237 Dusseldorf, Germany Telephone: 0211-968550 FAX: 0211-9685555

INDIA

MEERA AGENCIES PVT. LTD. 23 Community Centre Zamroodpur, Kailash Colony Extension, New Delhi, India 110 048 Phone: 011-2-6442700/6442800 FAX : 011-2-644250023

ISRAEL

TECH-CENT, LTD. 4 Raul Valenberg St Tel-Aviv 69719 Telephone: (03) 64-78-563 FAX: (03) 64-78-334

ITALY

ANRITSU Sp.A Roma Office Via E. Vittorini, 129 00144 Roma EUR Telephone: (06) 50-99-711 FAX: (06) 50-22-4252

JAPAN

ANRITSU CUSTOMER SERVICE LTD. 1800 Onna Atsugi-shi Kanagawa-Prf. 243 Japan Telephone: 0462-96-6688 FAX: 0462-25-8379

SINGAPORE

ANRITSU (SINGAPORE) PTE LTD. 10, Hoe Chiang Road #07-01/02 Keppel Towers Singapore 089315 Telephone: 282-2400 FAX: 282-2533

SOUTH AFRICA

ETECSA 12 Surrey Square Office Park 330 Surrey Avenue Ferndale, Randburt, 2194 South Africa Telephone: 011-27-11-787-7200 FAX: 011-27-11-787-0446

SWEDEN

ANRITSU AB Botivid Center Fittja Backe 13A 145 84 Stockholmn Telephone: (08) 534-707-00 FAX: (08) 534-707-30

TAIWAN

ANRITSU CO., INC. 7F, No. 316, Section 1 NeiHu Road Taipei, Taiwan, R.O.C. Telephone: 886-2-8751-1816 FAX: 886-2-8751-2126

1-8 MN4790A MM

Chapter 2 Replaceable Parts

2-1 INTRODUCTION This chapter provides replaceable parts information for the model

MN4790A test set. The major replaceable test set assemblies and parts are listed in Table 2-1, following page. The locations of these as semblies/parts are shown in Figure 2-1 on page 2-3.

2-2 EXCHANGE ASSEMBLY

PROGRAM

Anritsu maintains a module exchange program for selected subassemblies. If a malfunction occurs in one of these subassemblies, the defective item can be exchanged. Upon receiving your request, Anritsu will ship the exchange subassembly to you,typically within 24 hours. You then have 45 days in which to return the defective item. All exchange subassemblies or RF assemblies are warranted for 90 days from the date of shipment,or for the balance of the original equipment warranty, whichever is longer.

NOTE

Please have the exact model number and serial number of your unit available when requesting this service,as the information about your unit is filed according to the instrument’s model and serial number.For more information about the program, contact your local sales representative or call Anritsu Customer Service direct (refer to Section 2-4).

MN4790A MM 2-1

REPLACEABLE SUBASSEMBLIES AND PARTS REPLACEABLE PARTS

2-3 REPLACEABLE

SUBASSEMBLIES AND PARTS

Table 2-1. Replaceable Subassemblies

Part Number Description Location (Figure 2-1)

1020-46 SP3T Switch S1 and S7 1020-47 SPDT Switch S2 to S6 1091-346 Combiner A2 2000-989 GPIB Interface Assembly A1 40-159 Power Supply A6 SC6737 Bias Tee Assembly A4 and A5 ND60327 Fan Assembly FAN 43045-3 Control PCB Assembly A7 339H40998A Step Attenuator A3 B45259 N Type Test Port Connector N-Connectors

2-4 PARTS ORDERING

INFORMATION

Table 2-1 lists the major replaceable subassemblies and parts for the MN4790A. These assemblies and parts are presently covered by the Anritsu exchange assembly program.

All parts listed in Table 2-1 may be ordered from your local Anritsu service center (Table 1-2,page 1-8).Or, they may be ordered directly from the factory at the following address:

Anritsu Company ATTN: Customer Service 490 Jarvis Drive Morgan Hill,CA 95037-2809

Telephone: (408)-778-2000 FAX: (408)-778-0239

2-2 MN4790A MM

REPLACEABLE PARTS PARTS ORDERING INFORMATION

LINE MODULE

POWER SUPPLY

POWER SUPPLY LOAD

SOLDER JUNCTION

COMM

RBS A/B DC BIAS SOURCE/FUSE

FAN

COMBINER

RF PIN SWITCHES (7)

COMM

CONTROL

COMM

GPIB CONNECTOR

PCB

ATTENUATOR

COMM

GPIB

PARALLEL

INTERFACE

PCB

RBS A BIAS TEE

Figure 2-1. MN4790A Major Assemblies Location Diagram (Top View)

RBS B BIAS TEE

MN4790A MM 2-3

PARTS ORDERING INFORMATION REPLACEABLE PARTS

Figure 2-2. MN4790A Wiring Diagram (Top View)

2-4 MN4790A MM

REPLACEABLE PARTS PARTS ORDERING INFORMATION

Figure 2-3. MN4790A RF Cabling Diagram (Top View)

MN4790A MM 2-5/2-6

+ 47 hidden pages

ANRITSU MN4790A, ME7842B Schematic

ME7842B

Table of Contents

Chapter 1 General Information

Chapter 2 Replaceable Parts