ANRITSU MS4782A, MS4782D Schematic

MODEL

MS4782A/MS4782D

TEST SET FOR

POWER AMPLIFIER TEST SYSTEM

MAINTENANCE MANUAL

490 JARVIS DRIVE l MORGANHILL,CA95037-2809

P/N: 10410-00238

REVISION: A

PRINTED: JANUARY 2001

COPYRIGHT 2001 ANRITSU CO.

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. Buyers shall prepay transportation charges for equipment returned to ANRITSU
for warranty repairs. Obligation is limited to the original purchaser. ANRITSU is not liable for con
sequential damages.

LIMITATION OF WARRANTY

The foregoing warranty does not apply to ANRITSU connectors that have failed dueto 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 other warranty is expressed or implied, and the remedies provided herein
are the Buyer’s sole and exclusive remedies.

TRADEMARK ACKNOWLEDGEMENTS

V Connector and K Connector are registered trademarks of ANRITSU Company.
ANACAT is a registered trademark of EEsof, Inc.
Ink Jet and Think Jet are registered trademarks of Hewlett-Packard Co.
MS-DOS is a registered trademark of Microsoft Corporation.

NOTICE

-

ANRITSU Company has prepared this manual for use by ANRITSU Company personnel and cus
tomers 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.

-

Table of Contents, Narrative

Chapter 1 — General Service Information

This chapter provides a general description of the Model MS4782X Test Set for the ME7840A Power
Amplifier Test System. It explains the level of maintenance covered in this manual and the service
strategy used throughout this manual. It also contains static-sensitive component handling precau
tions and a list of recommended test equipment.

Chapter 2 — Replaceable Parts

This chapter lists all replaceable subassemblies and components for the MS4782A and MS4782D
models. It explains the ANRITSU exchange assembly program and provides parts ordering informa
tion.

Chapter 3 — Performance Verification Procedures

This chapter provides detailed procedures for verifying that the performance of the MS4782X meets
minimum performance standards.

Chapter 4 — Troubleshooting

This chapter provides information for troubleshooting the MS4782X Test Set. The troubleshooting
procedures contained in this chapter support fault isolation down to a replaceable subassembly.

Chapter 5 — Removal and Replacement Procedures

This chapter describes how to gain access to all of the major assemblies and major parts for trouble­shooting and/or replacement.

-

-

Appendix A — Connector Maintenance Check Procedures

This appendix contains procedures and information needed to perform maintenance checks (includ
ing pin-depth measurements) for the connectors on all ANRITSU supplied Calibration/Verification
Kit components, Through-cables, and other associated RF/microwave components.

Index

-

MS4782X MM i/ii

Chapter 1 General Information

Table of Contents

1-1 SCOPE OF MANUAL .......................1-3

1-2 INTRODUCTION .........................1-3

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

1-4 ONLINE MANUAL ........................1-3

1-5 SYSTEM DESCRIPTION .....................1-4

1-6 RELATED MANUALS ......................1-4

1-7 STANDARD OPTIONS ......................1-4

1-8 SERVICE STRATEGY.......................1-5

Functional Assembly Level Troubleshooting ···········1-5
Internal Hardware Adjustments and Calibrations········1-5
Internal Service Log ························1-5
System Test/Certification ·····················1-6
Preventive Service ·························1-6
Servicing Specially Modified Instruments ············1-6

1-9 SERVICE SUPPORT .......................1-6

Technical Support ·························1-7
Field Service Kits ·························1-7
Service Software ··························1-7
Verification Kits ··························1-8
Test Fixtures/ Aids·························1-8

Failed Assembly Exchange Program ···············1-8

1-10 PERFORMANCE SPECIFICATIONS ..............1-9

1-11 SERVICE CENTERS .......................1-9

1-12 STATIC SENSITIVE COMPONENT HANDLING

PROCEDURES ..........................1-9

1-13 RECOMMENDED TEST EQUIPMENT ·············1-9

Figure 1-1. Typical MS4782X Test Set

Chapter 1
General Information

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

formation for the ANRITSU MS4782A and MS4782D Test Set for the
ME7840A Power Amplifier Test System. It contains procedures for:

Testing the instrument for proper operation.

q

Verifying measurement accuracy and traceability to National In

q

stitute of Standards and Technology (NIST).
Troubleshooting a failed instrument to the exchange subassem

q

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

q

Throughout this manual, the terms “MS4782X” and “Test Set” will be
used interchangeably to refer to both Models of MS4782X Test Set,
unless otherwise noted.

1-2 INTRODUCTION This chapter provides a general description of PowerAmplifier Test

System serial numbers, frequency ranges, and related manuals. It also
includes service strategy, available service facilities, and static-sensitive
component handling precautions, and a list of recommended test equip
ment.

1-3 IDENTIFICATION

NUMBER

All ANRITSU instruments are assigned a six-digit ID number, such as
“401001”. 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, part number
10920-00035, is provided free of charge with this manual.

1-5 PATS SYSTEM

OVERVIEW

The ANRITSU ME7840A Power Amplifier Test System (PATS) is in
tended for the measurement and real-time graphical display of the fol
lowing parameters of a power amplifier in the frequency range of 800
MHz to 2.4 GHz:

MS4782X MM 1-3

-

-

HARDWARE DESCRIPTION GENERAL INFORMATION

S-Parameters including Hot S

q

K Factor

q

Gain Compression and Phase Distortion

q

Intermodulation Distortion

q

Harmonics

q

Drain Current and Power Added Efficiency (PAE)

q

PATS is designed to facilitate alignment, tuning and pass/fail testing
of the components, modules and subassemblies of a power amplifier as
well as the completed amplifier.

22

1-6 HARDWARE

DESCRIPTION

The ME7840A hardware (below) consists of a MS462XC, Direct Re
ceiver Access (DRA) Scorpion, a MS4782X Test Set, a customer sup

-

­plied Personal Computer (PC), and an optional current probe. The
MS462XC is available in two frequency ranges: 10 MHz to 3 GHz or 10
MHz to 6 GHz.

The Test Set is available in two configurations, as described in Table
1-1 The MS4782D is standard, and the MS4782A is Option 2. A block
diagram of the PATS is shown in Figure 1-2 and the Option 2 system
in Figure 1-1.

1-4 372XXC/373XXC MM

GENERAL INFORMATION HARDWARE DESCRIPTION

SOURCE 2 SOURCE 1

ACCESS

SCORPION

DIRECT RECEIVER

OPTIONAL
EXTERNAL

PREAMPLIFIERS

ATTENUATORS
70dB, 10dB/step

RF3

N

N

COMBINER

STEP

RF1

REVERSE

FORWAR

D

TRANSFER SWITCH

GPIB

ANALOG IN

SYSTEM

CONTROLLER

(PC)

GPIB

RECEIVERS

EXT I/O

a

b

1

1

N

KKKN

K

a

b

2

K

KKN

RF2

2

CONTROL
LINES

NK

-30dB

LIMITER

ER

POW

OPTIONAL

SPECTRUM

ANALYZER

POWER

METER

POWER
SUPPLY

MS478A Test Set

NK

OPTIONAL

MODULATION

SYNTHESIZER

OPTIONAL

EXTERNAL

PRE-AMP

HIGH

STEP

ATTENUATOR

-30dB

-30dB

N

K

70dB, 10dB/step

-30dB

N

TERMINATION

N

AUT

CURRENT PROBE

Indicates coaxjumper in the as-shipped configuration

Figure 1-1. Overall Functional Block Diagram of the Option 2 Power Amplifier Test System (PATS) with MS4782A

Test Set

MS4782X MM 1-5

HARDWARE DESCRIPTION GENERAL INFORMATION

SOURCE 2 SOURCE 1

MS4782D Test Set

ACCESS

SCORPION

DIRECT RECEIVER

OPTIONAL

EXTERNAL

PREAMPLIFIERS

ATTENUATORS
70dB, 10dB/step

RF3

N

N

COMBINER

-30dB

STEP

RF1

REVERSE

FORWAR

D

TRANSFER SWITCH

GPIB

ANALOG IN

SYSTEM

CONTROLLER

(PC)

GPIB

RECEIVERS

EXT I/O

a

b

1

1

N

KKKN

K

LIMITER

STEP

ATTENUATOR

70dB, 10dB/step

a

b

2

2

K

KKN

RF2

-30dB

CONTROL
LINES

NK

K

C3

K

C2

EXTERNAL

100 W

TERMINATION

K

C1

CIRCULATOR

OPTIONAL

SPECTRUM

ANALYZER

NK

OPTIONAL

MODULATION

SYNTHESIZER

OPTIONAL

EXTERNAL

PRE-AMP

-30dB

N

K

-30dB

N

N

AUT

POWER

METER

POWER
SUPPLY

CURRENT PROBE

Indicates coaxjumper in the as-shipped configuration

Figure 1-2. Overall Functional Block Diagram of the Basic Power Amplifier Test System (PATS) with MS4782D Test

Set

1-6 MS4782X MM

GENERAL INFORMATION SYSTEM DESCRIPTION

Table 1-1. Test Set Configurations

Model

MS4782A 800 to 1000 50 Yes Internal
MS4782D 800 to 2400

Notes:

1. This frequency range does not account for any restricting effects caused by use of external circulator.

2. This Max AUT power assumes a minimum isolation of 23 dB provided by external circulator(s). Two circulators may
have to be used to provide the required isolation.

Frequency Range

(MHz)

(Note 1)

Max AUT Power Output

(Watts)

100
(Note 2)

Reverse Measurements

, Hot S22,S12Possible)

(S

22

Yes External

Circulator

(at AUT Output Path)

1-7 SYSTEM DESCRIPTION Brief descriptions of the DRA Scorpion (MS462XC) and MS4782X

Test Set are given below.

DRA Scorpion The Scorpion Direct Receiver Access (DRA) version Vector Network

Measurement System (VNMS) (Figure 1-2) functions under control of
the software residing in the PC through GPIB commands. The soft­ware supports tuning and alignment operations by generating real
time graphic 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.

rd,5th

and 7thorder IMD products can be mea-

The DRA Scorpion includes the following capabilities:

q

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

q

Complete built-in capability for IMD measurements. A combiner
is provided in the Test Set.

q

Internal Transfer Switch enabling S22and Hot S22measure

-

ments. The reflectometer set-up is provided in the Test Set.

q

Direct access to each of the four receiver channels (two reference
channels and two test channels) for maximum flexibility in mea

­suring forward and reverse S-parameters over a wide range of
AUT output power. The Test Set provides incident and reflected
signal separation.

MS4782X Test Set The Series MS4782X Test Set contains a Wilkinson type combiner

that combines the two RF signals from Ports 1 and 3 (RF1 & RF3) of
the Scorpion. External preamplifiers can optionally be provided at the

MS4782X MM 1-7

SYSTEM DESCRIPTION GENERAL INFORMATION

combiner input to boost the input RF power to the amplifier-under­test (AUT). The combiner has power input rating of 30-Watts maxi
mum when terminated with a VSWR of 1.2:1. For an open or short at
the combiner output, the combiner input power rating is 0.5 Watts
maximum.

-

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

The combined signal from the Scorpion sources.

q

A modulated signal from an optional external modulation synthe

q

sizer.

A provision for the insertion of an optional external pre-amplifier (af

­ter the combiner and source selection switch) is also provided. Refer to
Chapter 7, “Preamplifier Operations,” for details.

The test set includes a bi-directional coupler at the input of the AUT
that separates the incident signal from the reflected signal. The power
rating of this bi-directional coupler is 100 watts average. The –30 dB
portion of the incident and reflected signals are applied to the Scor­pion reference port a
ment. The S

measurement determined by the DRA Scorpion is sim-

11

and test port b1, respectively, for S11measure-

1

ply the ratio of the reflected signal to the incident signal.
The amplified output of the AUT is fed to a high power coupler in the

test set. The power rating of this coupler is also 100-watts average.
The –30 dB coupled arm of this coupler is routed to the test port b

of

2

the Scorpion througha6dBresistive divider and a 0-dB to 70-dB step
attenuator (10dB/step). A limiter is also provided in this path provide
added protection for the Scorpion reference channel .

-

-

The divider enables the connections of a power meter or Spectrum An
alyzer, when desired, to measure the AUT b

output.

2

The through arm of the 100-W coupler is routed to a high power
(100-Watt) termination through a circulator. In the MS4782A Test
Set, the circulator is internal and has a rating of 100 watts average.
This circulator has an isolation specification of 20-dB minimum. This
means that the AUT output power is attenuated by 20 dB (plus other
losses) before reaching the Scorpion port 2. Since the maximum
(no-damage) power level for this port is 27 dBm (0.5 watt), this estab

-

lishes the maximum AUT output power at 50 watts.
In the MS4782D Test Set, the circulator is external as shown in Fig

­ure 1-2. In selecting an external circulator, the following criteria
should be used.

1-8 MS4782X MM

-

GENERAL INFORMATION SYSTEM DESCRIPTION

Power rating: Should be no less than the power output of the am

q

plifier-under-test (AUT). It should be noted that a 100 watt ter
mination is provided in the Test Set for the termination port of
the external circulator.

Bandwidth: Should be sufficiently wide to cover the frequency

q

band of the AUT.
Isolation: Should be no less than (Po-27 dB), where Pois the

q

power output in dBm of the AUT. Thus for Po = 47 dBm (50
watts), a 20 dB isolation is required. For a P

greater than 47

o

dBm up to 50 dBm (100 watts), two circulators in series can be
used.

Where S

or Hot S22measurements are not required, power amplifiers

22

with up to 100 watts average output power can be tested with the
MS4782D Test Set without any circulator by connecting the through
arm of the output coupler directly to the 100 watt termination (Port
C1 connected to Port C2 on the rear. The unit is shipped from the fac
tory with this loop jumper.)

For S

measurements, the transfer switch located within the Scorpion

22

routes the source 1 output signal to the output port of the AUT via
Port 2 (RF2) of the Scorpion. A separate 100-watt coupler in the test
set applies the –30 dB portion of this incident signal to the Scorpion
reference port a
AUT output port is applied to the Scorpion test port b

. The –30 dB portion of the signal reflected from the

2

by means of the

2

AUT output coupler.

-

-

-

The PATS calibration is performed with the test set in place, at the
connectors where AUT will be connected directly. Therefore, the test
set components and cables are included in the calibration loop and
their effects are calibrated out, resulting in correct and accurate mea
surements of the AUT.

The software supplied by ANRITSU supports operator control of the
source selection switch and step attenuator in the test set. This control
is achieved through the parallel TTL control lines available at the
Scorpion rear panel “External I/O” connector. The GPIB commands
from the PC to the Scorpion set the TTL control lines to the desired
states.

Connectors and Ports On the front panel of the Model MS4622/3C DRA Scorpion three Type

N (female) connectors are provided for Ports 1, 2 and 3.
Port 1 provides RF source 1 when the transfer switch is in the forward

position, and is terminated in 50 ohms to ground when the transfer
switch is in the reverse position.

-

MS4782X MM 1-9

SERVICE CENTERS GENERAL INFORMATION

Port 2 provides RF source 1 when the transfer switch is in the reverse
position, and is terminated in 50 ohms to ground when the transfer
switch is in the forward position.

Port 3 is allocated to RF source 2. Under independent control, port 3
provides RF source 2, or is terminated in 50 ohms to ground.

On the rear of the unit, four SMA connectors (Figure 1-) are provided
for Reference ports a
unit as well as all other mechanical specifications is the same as the
model MS4623B.

On the MS4782D Test Set, three additional SMA connectors provide
for connecting an external circulator. If reverse measurements (S
Hot S
through line should be connected between connectors C1 and C2 (Fig
ure 1-). The MS4782A is shipped from the factory with this through
line in place.

) are not desired, then a circulator is not required. Instead, a

22

and a2and Test Ports b1and b2. The front of the

1

22

and

-

1-8 SERVICE CENTERS ANRITSU Company offers a full range of repair and calibration services

at fully staffed and equipped service centers throughout the world. Table
2-1, located on page 2-2, lists all ANRITSU services centers.

1-9 STATIC SENSITIVE

COMPONENT HANDLING
PROCEDURES

1-10 RECOMMENDED TEST

EQUIPMENT

The Test Set contains components that can be damaged by static electric­ity. Figure 1-2 illustrates the precautions that should be followed when
handling static-sensitive subassemblies and components. If followed,
these precautions will minimize the possibilities of static-shock damage to
these items.

Table 1-2 lists the recommended test equipment to be used for all mainte
nance activities for the MS4782X models. Note the “Use” codes listed in
the right hand column of the table. These codes list the applicable
maintenance activities for the equipment listed.

-

1-10 MS4782X MM

GENERAL INFORMATION RECOMMENDED TEST EQUIPMENT

Table 1-2. Recommended Test Equipment

INSTRUMENT

Power Meter ANRITSU ML2437A or MS2438A
Power Sensor ANRITSU MA2472A
GPIB Cable IEEE 488-2 compliant ANRITSU 2100-2, or equivalent
Offset Termination SC5237 6 dB Return Loss

SC5270 20 dB Return Loss
Termination Return Loss 35 dB, DC to 3 GHz ANRITSU 28L50LF
Power Divider ANRITSU 11N50B
Adapter ANRITSU 34NN50A
Adapter ANRITSU 34NFNF50

Thru Line ANRITSU 3670NN50-2 or

Thru Line Phase stable

Length: 4 feet (2 each)
Calibration Kit ANRITSU 3653 or 3753LF

** USE CODES:

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

CRITICAL

SPECIFICATION

ANRITSU SC5237
ANRITSU SC5270

ANRITSU 34SFSF50
ANRITSU 34NKF50

15NN50-0.6B
GORE PhaseFlex

Part number EJD01D010480

RECOMMENDED

MANUFACTURER/MODEL

TM

USE*

*

P
P
P
P

OT

P
P

O, T

P

O, T

P,O

MS4782X MM 1-11

STATIC HANDLING GENERAL INFORMATION

Do not touch exposed contacts on

1.

any static sensitive component.

Wear a static-discharge wristband

4.

when working with static sensitive
components.

Do not slide static sensitive compo

2.

nent across any surface.

Label all static sensitive devices.

5.

Do not handle static sensitive com

-

3.

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

Keep component leads shorted to-

6.

gether whenever possible.

-

Handle PCBs only by their edges.

7.

Do not handle by the edge connec
tors.

-

Lift & handle solid state devices by

8.

their bodies – never by their leads.

Transport and store PCBs and

9.

other static sensitive devices in
static-shielded containers.

10. ADDITIONAL PRECAUTIONS:

·

Keep workspaces clean and free of any objects capable of holding or storing a static charge.

·

Connect soldering tools to an earth ground.

·

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

Figure 1-2. Static Sensitive Component Handling Procedures

1-12 MS4782X MM

Chapter 2 Replaceable Parts

Table of Contents

2-1 INTRODUCTION .........................2-3

2-2 EXCHANGE ASSEMBLY PROGRAM ..............2-3

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

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

Table 2-1. Anritsu Service Centers

UNITED STATES

ANRITSU COMPANY
490 Jarvis Drive
Morgan Hill, CA 95037-2809
Telephone: [phone]
1-800-ANRITSU
FAX: [phone]

ANRITSU COMPANY
10 New Maple Ave., Unit 305
Pine Brook, NJ 07058
Telephone: [phone], 1-800-ANRITSU
FAX: [phone]

ANRITSU COMPANY
1155 E. Collins Blvd
Richardson, TX 75081
Telephone: 1-800-ANRITSU
FAX: [phone]

AUSTRALIA

ANRITSU PTY. LTD.
Unit 3, 170 Foster Road
Mt Waverley, VIC 3149
Australia
Telephone: [phone]
FAX: [phone]

BRAZIL

ANRITSU ELECTRONICA LTDA.
Praia de Botafogo, 440, Sala 2401
CEP22250-040, Rio de Janeiro, RJ, Brasil
Telephone: [phone]
FAX: [phone]

CANADA

ANRITSU INSTRUMENTS LTD.
215 Stafford Road, Unit 102
Nepean, Ontario K2H 9C1
Telephone: [phone]
FAX: [phone]

FRANCE

ANRITSU S.A
9 Avenue du Quebec
Zone de Courtaboeuf
91951 Les Ulis Cedex
Telephone: [phone]
FAX: [phone]

GERMANY

ANRITSU GmbH
Grafenberger Allee 54-56
D-40237 Dusseldorf, Germany
Telephone: [phone]
FAX: [phone]

INDIA

MEERA AGENCIES (P) LTD.
A-23 Hauz Khas
New Delhi 110 016
Telephone: [phone]
FAX: [phone]

ISRAEL

TECH-CENT, LTD.
4 Raul Valenberg St
Tel-Aviv 69719
Telephone: [phone]
FAX: [phone]

ITALY

ANRITSU Sp.A
Roma Office
Via E. Vittorini, 129
00144 Roma EUR
Telephone: [phone]
FAX: [phone]

KOREA

ANRITSU CORPORATION LTD.
14F, Hyunjuk Bldg
832-41 Yeoksam-Dong
Kangnam-Ku
Seoul South Korea 150 010
Telephone: [phone]
FAX: [phone]

JAPAN

ANRITSU CUSTOMER SERVICE LTD.
1800 Onna Atsugi-shi
Kanagawa-Prf. 243 Japan
Telephone: [phone]
FAX: [phone]

SINGAPORE

ANRITSU (SINGAPORE) PTE LTD.
6 New Industrial Road #06-01/02
Hoe Huat Industrial Bldg
Singapore 536199
Telephone: [phone]
FAX: [phone]

SOUTH AFRICA

ETECSA
12 Surrey Square Office Park
330 Surrey Avenue
Ferndale, Randburt, 2194
South Africa
Telephone: [phone]
FAX: [phone]

SWEDEN

ANRITSU AB
Botivid Center
Fittja Backe 1-3
S145 84 Stockholmn
Telephone: [phone]
FAX: [phone]

TAIWAN

ANRITSU CO., LTD.
6F, No. 96, Section 3
Chien Kuo N. Road
Taipei, Taiwan, R.O.C.
Telephone: [phone]
FAX: [phone]

UNITED KINGDOM

ANRITSU LTD.
200 Capability Green
Luton, Bedfordshire
LU1 3LU, England
Telephone: [phone]
FAX: [phone]

Chapter 2
Replaceable Parts

2-1 INTRODUCTION This chapter provides replaceable parts information for both MS4782X

models. The major replaceable Test Set assemblies and parts are
listed in Table 2-2 . The locations of these assemblies/parts are shown
in Figure 2-1.

2-2 EXCHANGE ASSEMBLY

PROGRAM

ANRITSU maintains a module exchange program for selected subassem
blies. 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

When sending a failed assembly to the factory for ex­change, a copy of the Service Log must always accompany
the failed assembly. This copy may be a printout, or a
saved disk copy. Due to the importance of the service log
information to the ANRITSU factory Service Engineers,
the exchange prices are only valid if the service log data is
included with the failed assembly.

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 rep
resentative or call ANRITSU Customer Service direct (refer to para
graph 2-4.

-

-

-

2-3 REPLACEABLE

SUBASSEMBLIES AND
PARTS

Table 2-2 lists the major replaceable subassemblies and parts for the
MS4782X. These assemblies/parts are presently covered by the
ANRITSU exchange assembly program.

MS4782X MM 2-3

PARTS ORDERING INFORMATION REPLACEABLE PARTS

Table 2-2. Replaceable Subassemblies

Part Number Description Where used

1000-50 A7 Circulator, 800 to 1000 MHz, 50W MS4782A internal, MS4782D external
1000-52 A7 Circulator, 1.8 to 2.5 GHz, 50W MS4782D external
1000-53 A7 Circulator, 1.8 to 2.5 GHz, 79W MS4782D external
1015-51 A8 High Power Termination MS4782A and MS4782D
ND55507 A10 SPDT Switch Assembly MS4782A and MS4782D
1091-305 A4 Combiner MS4782A and MS4782D
1091-307 A1 Coupler MS4782A and MS4782D
1091-307 A2 Coupler MS4782A and MS4782D
1091-307 A3 Coupler MS4782A and MS4782D
1091-308 Dual Coupler MS4782A and MS4782D
1K50A A5A2 RF Limiter MS4782A and MS4782D
339H40998A A5 Step Attenuator MS4782A and MS4782D
40-133 A6 Power Supply MS4782A and MS4782D
43045-3 A9 System Control PCB Assy MS4782A and MS4782D
K240B A5A1Power Divider MS4782A and MS4782D
ND55508 Fan Assembly MS4782A and MS4782D

2-4 PARTS ORDERING

INFORMATION

All parts listed in Table 2-2 may be ordered from your local ANRITSU
service center (Table 2-1, page 2-2). 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: [phone]
FAX: [phone]

2-4 MS4782X MM

REPLACEABLE PARTS PARTS ORDERING INFORMATION

A

r

A6 Power
Supply

A10 SPDT
Switch

A8 High Power
Termination

7 Circulator

(MS4782A only)

A9 Control PCB
Assembly

A6

A8

A3 Coupler

A5A2 Limiter

A5A2

A9

A3

A5

A5 Step Attenuato

A5A1 Power Divider

A10

A7

A2

A1

A4

A2 Coupler

A4 Combiner

A1 Coupler

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

MS4782X MM 2-5/2-6

Chapter 3 Performance Verification Procedure

Table of Contents

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

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

3-3 TEST EQUIPMENT .......................3-3

3-4 SOURCE OUTPUT ACCURACY .................3-5

3-5 RETURN LOSS CONFIDENCE TEST ..............3-6

Test Procedure: ··························3-7

3-6 SYSTEM DYNAMIC RANGE ..................3-9

3-7 RECEIVER DISPLAY LINEARITY ..............3-11

Chapter 3
Performance Verification
Procedure

3-1 INTRODUCTION The following are the specific tests that should be used to verify the

performance of the Power Amplifier Test System (PATS). This is the
same procedure that appears in the system OMM, ME7840A Opera
tion and Maintenance Manual.

Source Output Level Accuracy Test

q

Return Loss Measurement Confidence Test

q

System Dynamic Range Test

q

Receiver Magnitude Display Linearity Test

q

3-2 CONVENTIONS In the tests in this chapter, instructions will direct use front panel

hard keys and softkeys. The hard keys and softkeys will appear in a
different typeface. For example:

-

Step 1. Press the Utility key and select:

DIAGNOSTICS
TROUBLESHOOTING
MORE
VERIFY ALC CALIBRATON

The Utility key is a front panel hard key and DIAGNOSTICS, TROU
BLESHOOTING, MORE, and VERIFY ALS CALIBRATION are all

softkeys.

-

3-3 TEST EQUIPMENT The following equipment is required to perform the verification proce

dures.

q

ANRITSU Model ML243XA Power Meter

q

ANRITSU Model MA247XA Power Sensor

q

ANRITSU Model 3653 or 3753LF N connector Calibration Kit

q

ANRITSU Model SC5237 6 dB Offset Termination

q

ANRITSU Model SC5270 20 dB Offset Termination

q

ANRITSU Model 11N50B Power Divider

-

MS4782X MM 3-3

TEST EQUIPMENT PERFORMANCE VERIFICATION

ANRITSU Model 3670NN50-2 Cable

q

ANRITSU Model 34NN50A Adapter

q

ANRITSU 2100-2 GPIB cable

q

3-4 MS4782X MM

PERFORMANCE VERIFICATION SOURCE OUTPUT ACCURACY

3-4 SOURCE OUTPUT

ACCURACY

This test verifies the source output accuracy of the MS462XC. The test
procedure uses the Power ALC Verification built-in function of the
MS462XC Basic Measurement software.

Setup:

Step 1. Connect a GPIB cable between the power meter GPIB connector and

the MS462XC dedicated GPIB connector, as shown in Figure 3-1.

00000001

WARNING

NOOPERATORSERVICE-

ABLEPARTSINSIDE.

REFERSERVICINGTO
QUALIFIEDPERSONNEL.

N274

PARALLELPRINTER

RS232

B

IEEE488.2

GPIB

Dedicated

GPIB

Madei nUK

GPIB/ IEEE 488

WARNING

NOOPERATORSERVICE-

ABLEPARTSINSIDE.

A

CALIBRATOR

SerialPort

Ethernet

CAUTION

85-250VAC

DONOTOPERATE

47-440Hz

WITHUNGROUNDED

40VAMAX

POWERCORD.

OUTPUT1 OUTPUT 2 INPUT1

DIGITAL

SEEMANUAL FOR VOLTAGE RANGES ON BNC CONNECTORS

VGA

Ext
Analog
Output

INPUT2

12-24VDC

ANALOG

(1.3A)

SCSI-2

CAUTION

FORCONTINUED FIRE

PROTECTIONREPLACE

ONLYWITHSPECIFIED

TYPEAND RATEDFUSE.

CAUTION

DONOTOPERATE
WITHPOWERCORD

UNGROUNDED

ExtI/O

47-440Hz
85-264VAC

REPLACEFUSE ONLYWITH

SAMETYPEAND RATING

LPTLine Printer

Ext

Trigger

Port2

Port2

Noise

In

Noise

+28V

Port1

Bias

BiasFuse

Bias

Ext

Port1

BiasFuse

Ext10 MHz

ExtAnalog

Source

In

In

Figure 3-1. ML2430A Series Power Meter GPIB connection to the MS462XX Vector Network Measurement System

Step 2. Turn on the MS462XC VNMS and allow it to warm-up at least one

hour.

Test Procedure

Step 1. Disconnect cables between MS462XC Port 1 and Port 1 of MS4782 Test

Set and between Port 3 of MS462XC and Port 3 of MS4782 Test Set.

Step 2. Press Utility key and select:

DIAGNOSTICS
TROUBLESHOOTING
MORE
VERIFY ALC CALIBRATON

Step 3. Calibrate and zero the power sensor.

MS4782X MM 3-5

RETURN LOSS CONFIDENCE TEST PERFORMANCE VERIFICATION

Step 4. Connect power sensor to MS462XC Port 1 and select START VERIFI

CATION softkey.

Step 5. Verify that Source 1 passes this test.

Note

The worst case test result will be displayed on the screen
when the instrument fails this test only. The failed test re
sult is also recorded in the Service Log.

Step 6. Press the SELECT SOURCE soft key to select 2
Step 7. Connect power sensor to MS462XC Port 3 and select START VERIFI

CATION soft key.

Caution

The TROUBLESHOOTING function must be properly ex
ited to restore normal measurement operation.

Step 8. Verify that Source 2 passes this test.
Step 9. Select the menu soft key as follows to exit the TROUBLESHOOTING

mode:

-

-

-

-

3-5 RETURN LOSS

CONFIDENCE TEST

RETURN
RETURN
FINISHED, RECOVER FROM TROUBLESHOOTING

Step 10. Reconnect cables between MS462XC Port 1 and Port 1 of MS4782 Test

Set and between Port 3 of MS462XC and Port 3 of MS4782 Test Set.

This test verifies the accuracy of return loss measurements.

Setup: Set up the Test Set as described below.

Step 1. Turn on the MS462XC VNMS and MS4782X Test Set and allow them

to warm up for 30 minutes.

Step 2. Press Default key then 0 key.
Step 3. Press Seq key and select:

TTL I/O.
PARALLEL OUT SETUP
SET PARALLEL OUT PORT (0-255)

Step 4. Change the value from 0 to 8.

3-6 MS4782X MM

PERFORMANCE VERIFICATION RETURN LOSS CONFIDENCE TEST

Step 5. Select:

RETURN
RETURN

Step 6. Press Display key and select:

DISPLAY MODE
SINGLE CHANNEL
RETURN

Step 7. Press Ch 4 key and then Display key.
Step 8. Select:

GRAPH TYPE
LOG MAGNITUDE

Step 9. Press Ch 1 key and select LOG MAGNITUDE.

Test Procedure: Insert the Calibration Component Coefficients disk into the MS462XC

floppy disk drive.

Step 1. Press Cal key and select:

COMPONENT UTILTIES
INSTALL KIT INFO FROM FLOPPY DISK
RETURN

Step 2. Follow the prompts and select:

PERFORM CAL: 2 PORT
CAL METHOD: STANDARD
LINE TYPE: COAXIAL
SELECT CALIBRATION TYPE: REFLECTION ONLY – PORT 1 ONLY
FREQUENCY RANGE OF CALIBRATION: 800 MHz TO 2400 MHz
SELECT CALIBRATION DATA POINTS: NORMAL
DATA POINTS: 401 POINTS
PORT 1 CONNECTOR TYPE: N (F)
LOAD TYPE: BROADBAND LOAD

Step 3. Select START CAL soft key to begin calibration.
Step 4. Install calibration device per instruction on the display. Select the ap

propriate soft key to measure the calibration device.

-

Step 5. When the “CALIBRATION SEQUENCE COMPLETED” message is

displayed, press the Enter key to continue.

MS4782X MM 3-7

RETURN LOSS CONFIDENCE TEST PERFORMANCE VERIFICATION

Step 6. Connect SC5237 6 dB Offset Termination to Test Port 1 of MS4782

Test Set. Record the measured value in Table 3-3 and verify the mea
sured S

Step 7. Connect SC5270 20 dB Offset Termination to Test Port 1 of MS4782

Test Set. Record the measured value in Table 3-3 and verify the mea
sured S

Step 8. For MS4782D with no circulator installed, skip steps 8 to 15.
Step 9. Press Cal key.

Step 10. Follow the prompts and select:

PERFORM CAL: 2 PORT
CAL METHOD: STANDARD
LINE TYPE: COAXIAL
SELECT CALIBRATION TYPE: REFLECTION ONLY – PORT 2 ONLY
FREQUENCY RANGE OF CALIBRATION: See below:

value is 6 ±0.4 dB. Remove SC5237 Termination.

11

value is 20 ± 1.0 dB. Remove SC5270 Termination.

11

-

-

Model Frequency Range
MS4782A 800 MHz to 1000 MHz
MS4782D w/1000-50 Circulator 800 MHz to 1000 MHz
MS4782D w/1000-52 Circulator

or 1000-53 Circulator

1.8 GHz to 2.4 GHz

SELECT CALIBRATION DATA POINTS: NORMAL
DATA POINTS: 401 POINTS
PORT 2 CONNECTOR TYPE: N (F)
LOAD TYPE: BROADBAND LOAD

Step 11. Select START CAL soft key to begin calibration.
Step 12. Install calibration device per instruction on the display. Select the ap

propriate soft key to measure the calibration device.

Step 13. When the “CALIBRATION SEQUENCE COMPLETED” message is

displayed, press the Enter key to continue.

Step 14. Connect SC5237 6 dB Offset Termination toTest Port 2 of MS4782

Test Set. Record the measured value in Table 3-3 and verify the mea
sured S

value is 6 ± 0.4 dB. Remove SC5237 Termination.

22

-

-

Step 15. Connect SC5270 20 dB Offset Termination to Test Port 2 of MS4782

3-8 MS4782X MM

PERFORMANCE VERIFICATION SYSTEM DYNAMIC RANGE

3-6 SYSTEM DYNAMIC

RANGE

Test Procedure:

Test Set. Record the measured value in Table 3-3 and verify the mea
sured S

Table 3-3. Offset Terminator Specifications

Offset
Termination

SC5237 6 ±0.4 dB
SC5270 20 ±1.0 dB
* Do not apply to MS4782D with no circulator installed

value is 20 ± 1.0 dB. Remove SC5270 Termination.

22

Measured S
Value

11

Measured S
Value*

22

Specification

This test verifies the PATS system dynamic range.

Step 1. Press Default key then 0 key of MS462XC to reset the system.
Step 2. Press Seq key.
Step 3. Select:

TTL I/O.
PARALLEL OUT SETUP
SET PARALLEL OUT PORT (0-255)

-

Step 4. Change the value from 0 to 8.
Step 5. Select:

RETURN
RETURN

Step 6. Press Ch 3 key.
Step 7. Press Display key and select:

DISPLAY MODE
SINGLE CHANNEL
RETURN
GRAPH TYPE
LOG MAGNITUDE
RETURN

Step 8. Press Cal key.

MS4782X MM 3-9

SYSTEM DYNAMIC RANGE PERFORMANCE VERIFICATION

Step 9. Follow the prompts and select::

PERFORM CAL: 2 PORT
CAL METHOD: STANDARD
LINE TYPE: COAXIAL
SELECT CALIBRATION TYPE: TRANSMISSION FREQUENCY RE
SPONSE
PATH: FORWARD PATH (S
USE OF ISOLATION IN CALIBRATION: INCLUDE
FREQUENCY RANGE: 800 MHz TO 2400 MHz
SELECT CALIBRATION DATA POINTS: NORMAL
DATA POINTS: 401 POINTS
TEST SIGNAL/PORT 1 POWER: 10 dBm

)

21

-

Step 10. After the selections are complete, press the START CAL soft key to be

gin calibration.

Step 11. Install calibration device per instruction on the display. Select the ap

propriate soft key to measure. Connect a cable between Test Port 1 and
Test Port 2 of MS4782X Test Set when the software prompts for a
throughline on the display.

Step 12. When the “CALIBRATION SEQUENCE COMPLETED” message is

displayed, press the Enter key to continue.

Step 13. Press Avg key and select:

SELECT I.F. BANDWIDTH
I.F. BW 10 Hz

Step 14. Remove the through cable between Test Port 1 and Test Port 2 of

MS4782X Test Set and connect terminations to both ports.

Step 15. Press Display key and then select SCALE.
Step 16. Set REFERENCE VALUE to -80.
Step 17. Verify that the trace is less than -80 dB.

-

-

3-10 MS4782X MM

PERFORMANCE VERIFICATION RECEIVER DISPLAY LINEARITY

3-7 RECEIVER DISPLAY

LINEARITY

Step 1. Set up the test equipment as shown in Figure 3-2

ML243XA
Power Meter

PowerMeter

ML2408A

8

9

7

4

5

6

1

0

ON/ OFF

Power Meter

3

2

+/-

CLR

Channel

Sensor

This test verifies the magnitude display linearity of the receiver.

NOTE

Zero and calibrate Power Sensor prior to connecting to the
power divider.

Setup: Set up the test equipment as described below.

MS462X3C

GPIB

CALIBRATOR

A

B

System

Trigger

Cal/ Zero

Port 3

50 Ohm Terminations

Port 1 Port 2

Port 1 Port 2Port 3

Test

Test

Port 2

Port 1

34NN50A

DRA Scorpion

MS4782A
Test Set

POWER SENSOR

Figure 3-2. Receiver Magnitude Display Linearity Test Setup

Step 2. Allow the system to warm up for at least one hour.
Step 3. Press Default key then 0 key.
Step 4. Press Seq key and select:

TTL I/O
PARALLEL OUT SETUP
SET PARALLEL OUT PORT (0-255)

Step 5. Change the value from 0 to 8.
Step 6. Select:

RETURN
RETURN

11N50B

POWER DIVIDER

MS4782X MM 3-11

RECEIVER DISPLAY LINEARITY PERFORMANCE VERIFICATION

Step 7. Press Freq key.
Step 8. Change START FREQUENCY to 800 MHz and STOP FREQUENCY to

1 GHz.

Step 9. Toggle C.W. MODE OFF soft key to C.W. MODE ON.
Step 10. Change C.W. Frequency to 1 GHz.
Step 11. Press Config key and select:

DATA POINTS
POINTS DRAW IN C.W. – 51 POINT(S)

Step 12. Press Avg key and select:

SELECT I.F. BANDWIDTH
I. F. BW 10 Hz

Step 13. Press Power key and select SOURCE 1 SETUP.

Note

Ensure that the Power Sensor Cal Factor is set for 1 GHz.
Refer to the ML24XXA Operational Manual.

Step 14. Adjust SOURCE 1 POWER so that the power meter readout is 0 dBm

± 0.1 dB.

Step 15. Press Ch 3 key.
Step 16. Press Meas key and select USER DEFINED.
Step 17. Change RATIO to b2/1.
Step 18. Select S21/USER 1 soft key to use user defined parameter.
Step 19. Press Display key and select:

GRAPH TYPE
LOG MAGNITUDE
RETURN
TRACE MEMORY

Step 20. Allow the trace to sweep twice. Select:

STORE DATA TO MEMORY
VIEW DATE (/) MEMORY

Step 21. Press Marker key and select MARKER READOUT.

3-12 MS4782X MM

PERFORMANCE VERIFICATION RECEIVER DISPLAY LINEARITY

Step 22. Use the soft key to turn on Marker 1. Then use the numeric data en

try key to change POINT to 25.

Step 23. Press Marker key again.
Step 24. Use the soft key to SCREEN DISPLAY ON.
Step 25. Press Power key and select SOURCE 1 SETUP.
Step 26. Set PORT 1 ATTN to 10 dB. Record the Power Meter Readout and the

Marker 1 Readout to the table on next page. Repeat this step for other
PORT 1 ATTN setting listed in the table.

Step 27. Verify if the difference of the two measured values are within specifi

cations (Table 3-4).

Table 3-4. Receiver Magnitude Display Linearity Specifications

PORT 1 ATTN

Setting (dB)

10
20
30

Power Meter

Reading

MS462XC Marker 1 Reading

Difference Between Two

Readings

-

-

Specification

£0.3 dB
£0.3 dB
£0.3 dB

40
50
60

£0.3 dB
£0.3 dB
£0.3 dB

MS4782X MM 3-13/3-14

Chapter 4 Troubleshooting

Table of Contents

4-1 INTRODUCTION ............................4-3

4-2 OPERATIONAL CHECK .....................4-3

4-3 COMBINER CHECK .......................4-3

Equipment Required: ·······················4-3
Setup:································4-3
Test Procedure: ··························4-6

4-4 COUPLER CHECK ........................4-9

Equipment Required: ·······················4-9
Setup:································4-9
Test Procedure: ··························4-11

4-5 TEST CHANNEL STEP ATTEN. CHECK ...........4-12

Setup: ·······························4-12
Test Procedure: ··························4-13

4-6 INT. TERM. RESISTANCE CHECK ................4-14

Test Procedure: ··························4-14

4-7 TROUBLESHOOTING......................4-14

If Test Set Does Not Power Up··················4-14
Line Source And Interface Checks················4-14
Power Supply
Voltage Check···························4-15
If The Pats System Fails Return Loss Confidence Tests ····4-15
If The Pats System Fails System Dynamic Range Test·····4-16
If The Pats System Fails Receiver Display Linearity Test · · · 4-16

Chapter 4
Troubleshooting

4-1 INTRODUCTION The tests in this section provide a method of testing the MS4782X

Test Set for proper operation. These tests are intended to be used as a
troubleshooting tools for checking the operational functionality of the
components in the MS4782X.

4-2 OPERATIONAL CHECK Operational Tests for the MS4782X consists of the following:

Combiner Check

q

Coupler Check

q

Test Channel Step Attenuator Check

q

Internal Termination Resistance Check

q

Caution

Prior to performing these tests, the MS462XC must be ver­ified to be in good condition.

4-3 COMBINER CHECK This test checks whether the Combiner functions properly.

Equipment Required: Anritsu ML243XA Power Meter

Anritsu MA2472A Power Sensor
Anritsu 2100-2 GPIB Interface Cable
Anritsu 34NFNF50 Adapter
Anritsu 3670NN50-2 Through cable or Anritsu 15NN50-0.6B cable

Setup: Set up the equipment as shown in Figure-4-1

Step 1. Turn on the ML243XA Power Meter, MS462XC Vector Network Mea

surement System and the MS4782X Power Amplifier Test Set. Allow
warm up 30 minutes.

Step 2. Press Default key and then 0 key to reset the MS462XC.
Step 3. Change the START frequency to 800 MHz.
Step 4. Change the STOP frequency to 2400 MHz.
Step 5. Press Seq key.

-

MS4782X MM 4-3

COMBINER CHECK TROUBLESHOOTING

00000001

PARALLELPRINTER

MadeinUK

CAUTION

85-250VAC

DONOTOPERATE

47-440Hz

WITHUNGROUNDED

40VAMAX

GPIB/IEEE 488

WARNING

NOOPERATORSERVICE-

ABLEPARTSINSIDE.

Ethernet

POWERCORD.

OUTPUT1 OUTPUT2 INPUT1

DIGITAL

SEEMANUALFOR VOLTAGERANGESON BNC CONNECTORS

VGA

Ext
Analog
Output

Port2

Bias

INPUT2

12-24VDC

ANALOG

(1.3A)

SCSI-2

ExtI/O

LPTLinePrinter

Ext
Trigger

Port1

Bias

47-440Hz

85-264VAC
REPLACEFUSEONLYWITH
SAMETYPEAND RATING

CAUTION

FORCONTINUEDFIRE

PROTECTIONREPLACE

ONLYWITHSPECIFIED

TYPEANDRATEDFUSE.

CAUTION

DONOTOPERATE
WITHPOWERCORD
UNGROUNDED

Port2

Port1

Ext

Ext10MHz

ExtAnalog

BiasFuse

BiasFuse

Source

In

In

RS232

B

A

CALIBRATOR

SerialPort

IEEE488.2

GPIB

Dedicated

GPIB

WARNING

NOOPERATORSERVICE-

ABLEPARTSINSIDE.

REFERSERVICINGTO
QUALIFIEDPERSONNEL.

N274

Noise

Noise

+28V

In

Rear panel power meter GPIB connection

GPIB

ML243XA
Power Meter

ML2408A

7

4

1

0

ON/ OFF

PowerMeter

8

5

2

9

6

Power Meter

3

+/-

CLR

Trigger

Channel

Sensor

CALIBRATOR

A

System

B

Cal/ Zero

POWER SENSOR

Figure 4-1. Test Equipment Setup for Combiner Check

Port 3

Port 3

50 Ohm Terminations

Port 1

Port 1

Test
Port 1

Port 2

Port 2

Test
Port 2

Connect as directed by procedure

MS462X3C
DRA Scorpion

MS4782X
Test Set

4-4 MS4782X MM

TROUBLESHOOTING COMBINER CHECK

Step 6. Select:

TTL I/O
PARALLEL OUT SETUP
SET PARALLEL OUT PORT (0-255)

Step 7. Change the value from 0 to 8.
Step 8. Select:

RETURN
RETURN

Step 9. Press Display key.

Step 10. Select:

DISPLAY MODE
SINGLE CHANNEL
RETURN
GRAPH TYPE
LOG MAGNITUDE
RETURN

Step 11. Press Meas key.
Step 12. Select:

MORE
S23
MORE
USER DEFINED
CHANGE RATIO
b2 (Tb)
1
S23/USER 6
RETURN

Step 13. Press Ch 3 key and then Display key.
Step 14. Select:

GRAPH TYPE
LOG MAGNITUDE
RETURN

Step 15. Press Meas key.
Step 16. Select:

MORE
S21
MORE
USER DEFINED

MS4782X MM 4-5

COMBINER CHECK TROUBLESHOOTING

CHANGE RATIO
b2 (Tb)
1
S21/USER 1
RETURN

Step 17. Press Config key.
Step 18. Select:

DATA POINTS
201 MAX PTS

Step 19. Disconnect the N male connector of the interconnect RF cable from “To

Port 1” front panel connector. Refer to Figure 4-1.

Step 20. Zero and calibrate the power sensor. Install the 34NFNF50 adapter to

the input of the Power Sensor.

Step 21. Connect the Power Sensor to the end of the RF cable.
Step 22. Press Power key.
Step 23. Select:

SOURCE 1 SETUP
FLAT TEST PORT POWER CAL
POWER TARGET 0.00 dBm
BEGIN CAL

Step 24. After the calibration is complete, remove the power sensor from the

RF cable and reconnect the cable to “To Port 1” front panel connector.

Step 25. Disconnect the N male connector of the interconnect RF cable from “To

Port 2” front panel connector. Refer to Figure 4-1.

Step 26. Connect the power sensor to the end of the RF cable.
Step 27. Press Power key.
Step 28. Select:

SOURCE 2 SETUP
FLAT TEST PORT POWER CAL
POWER TARGET 0.00 dBm
BEGIN CAL

Step 29. After the calibration is complete, remove the power sensor from the

RF cable and reconnect the cable to “To Port 2” front panel connector.

Test Procedure:

Step 1. Connect a through cable between Test Port 1 and Test Port 2 of the

MS4782X Test Set.

4-6 MS4782X MM

TROUBLESHOOTING COMBINER CHECK

Step 2. Press Display key.
Step 3. Select:

TRACE MEMORY

Step 4. Allow the trace to sweep twice.
Step 5. Select:

STORE DATA TO MEMORY
DISK OPERATIONS
SAVE MEMORY TO HARD DISK
CREATE NEW FILE

Step 6. Enter “COMBTST” as file name and select DONE to save the data to

hard disk.

Step 7. Press CH1 key.
Step 8. Press Display key.
Step 9. Select:

TRACE MEMORY
DISK OPERATIONS
RECALL MEMORY FROM HARD DISK
COMBTST NRM
VIEW DATA (/) MEMORY

Step 10. Verify that the displayed trace is withina1dBwindow.
Step 11. If this test fails, replace the A4 combiner. Refer to Figure-4-2.

MS4782X MM 4-7

COMBINER CHECK TROUBLESHOOTING

A

r

A6 Power
Supply

A10 SPDT
Switch

A8 High Power
Termination

7 Circulator

(MS4782A only)

A9 Control PCB
Assembly

A6

A8

A3 Coupler

A5A2 Limiter

A5A2

A9

A3

A5

A5 Step Attenuato

A5A1 Power Divider

A10

A7

A2

A1

A4

A2 Coupler

A4 Combiner

A1 Coupler

Figure 4-2. Major Assemblies Location Diagram (Top View)

4-8 MS4782X MM

TROUBLESHOOTING COUPLER CHECK

4-4 COUPLER CHECK This test checks whether the Port 1 and Port 2 Couplers function prop

erly.

Equipment Required: Gore PhaseFlexTM cables (p/n EJD01D01048.0) or equivalent (2

each)
Anritsu 34SFSF50 Adapter or equivalent
Anritsu 34NKF50 Adapters (2 each) or equivalent
Anritsu 28N50LF Termination or equivalent
Anritsu 28L50LF Termination or equivalent

Setup: Setup the test equipment as described below.

Step 1. Disconnect all inter-connect RF cables between the MS462XC Vector

Network Measurement System and the MS4782X Power Amplifier
Test Set.

Note

Do not disconnect the cable connected between Ext I/O
port of the MS462XC and Control In port of the MS4782X.

Step 2. Connect the MS462XC as shown in Figure 4-3.

MS462XC Front Panel

VectorNetwork Measurement System

10MHz-6GHz

MS4623B

Port3

Keyboard

Power

DataEntry

G/ns/m

8

9

7

Enter

M/s/cm

m

6

4

5

k/ms/mm

3

1

2

Clr

.

X1

-

0

Local

Channels

Appl

Meas

Display

Marker

Hold

Port1

Enhancement

Ch2

Ch1

Ch3

Freq

Power

Cal

Seq

Ch4

Avg

Utility

System

Stimulus

Hard

Sweep

Print

Copy

Save/

Config

Default

Recall

Port2

ProbePower

MS462XC Rear Panel

SerialPort

IEEE488.2

GPIB

Dedicated

GPIB

WARNING

NOOPERATORSERVICE-

ABLEPARTSINSIDE.

REFERSERVICINGTO
QUALIFIEDPERSONNEL.

N274

Noise

Noise

In

+28V

VGA

Ethernet

Ext

Analog

Output

Port2
Bias

SCSI-2

ExtI/O

LPTLinePrinter

Ext

Trigger

Port1
Bias

47-440Hz

85-264VAC
REPLACEFUSEONLYWITH
SAMETYPEAND RATING

CAUTION

FORCONTINUEDFIRE

PROTECTIONREPLACE

ONLYWITHSPECIFIED

TYPEANDRATEDFUSE.

CAUTION

DONOTOPERATE

WITHPOWERCORD

UNGROUNDED

Port2

Port1

Ext

Ext10MHz

ExtAnalog

BiasFuse

BiasFuse

Source

In

In

-

Port 1

34SFSF50 Adapter

Cable A
4 foot Gore PhaseFlex
cable (part number EJD01D01048.0)

Cable B
4 foot Gore PhaseFlex
cable (part number EJD01D01048.0)

b2 input

Figure 4-3. Coupler Check Test Setup

Step 3. Connect a through cable between the C1 and C2 connector ports of the

MS4782X.

Step 4. Turn on the MS462XC Vector Network Measurement System and the

MS4782X Test Set. Allow warm up 30 minutes.

Step 5. Press Default key and then 0 key to reset the MS462XC.
Step 6. Change the START frequency to 800 MHz.
Step 7. Change the STOP frequency to 2400 MHz.

MS4782X MM 4-9

COUPLER CHECK TROUBLESHOOTING

Step 8. Press Ch3 key and then Display key.
Step 9. Select:

DISPLAY MODE
SINGLE CHANNEL
RETURN
GRAPH TYPE
LOG MAGNITUDE
RETURN

Step 10. Press Meas key.
Step 11. Select:

MORE
S21
MORE
USER DEFINED
CHANGE RATIO
b2 (Tb)
1
S21/USER 1
RETURN

Step 12. Press Power key.
Step 13. Select:

Step 14. Verify the PORT 1 POWER is below –15 dBm. Adjust SOURCE 1

Step 15. Connect the two cables together with the 34SFSF50 Adapter.
Step 16. Press Display key.
Step 17. Select:

Step 18. Allow the trace to sweep twice. Select:

Step 19. Disconnect the connection between cable A and cable B at the adapter.

Test Procedure:

SOURCE 1 SETUP
PORT 1 ATTN 2*10 dB (0 – 70)

POWER control if necessary.

TRACE MEMORY

STORE DATA TO MEMORY
VIEW DATA (/) MEMORY

Step 1. Disconnect the Ext Pre-Amp RF loop cable between the Input and

Output connectors.

4-10 MS4782X MM

TROUBLESHOOTING COUPLER CHECK

Step 2. Connect cable A, cable B and termination to the connector ports as

stated in Table 4-1.

Table 4-1. Troubleshooting Connections

Tests

(from Port 1 of MS462XC)

Cable A

A Ext Pre-Amp Output connector of

MS4782X

B Test Port 1 connector of

MS4782X

C Test Port 2 connector of

(to b1 Input of MS462XC)

a1 Output connector of
MS4782X

b1 Output connector of
MS4782X

Aux Out connector of MS4782X b2 Output connector

Cable B

MS4782X

D To Port 2 connector of MS4782X a2 Output connector of

MS4782X

Step 3. Refer to Figure 4-4 and Figure 4-5 for connector locations.

Port 1 Port 2Port 3

50 Ohm Terminations

Test
Port 1

Termination

Test Port 1 Connec
tor

Ext Pre-Amp Output
connector of
MS4782X

and To Port 2 Con
nector of MS4782X

C3 connector of
MS4782D

Test
Port 2

-

-

Insertion

Loss

£ 33 dB
£ 33 dB

£40 dB

£ 33 dB

Figure 4-4. Test Set Front Panel

Step 4. Verify that the insertion loss in the corresponding path is within the

tolerance as stated in Table 4-1.

N274

a

Control

In

1

WARNING

NOOPERATOR SERVICE-

ABLEPARTS INSIDE.

REFERSERVICING TO
QUALIFIEDPERSONNEL.

Output

ExtPreamp

CAUTION

DONOT OPERATE

WITHPOWER CORD

UNGROUNDED

a

2

Input

b

1

b2To

AUT

TestPort 2

b

2

External
Circulator

C3

C2C1

50dBm

50dBm

Max

27dBm

Max

Max

100W

a2To

VNMS
Port2

Termination

(Internal)

LINE INPUT

85-240VAC

47-63Hz

100VA max

FUSE250 V 1.6 A T

CAUTION

FORCONTINUED FIRE

PROTECTIONREPLACE

ONLYWITH SPECIFIED

TYPEAND RATED FUSE

Figure 4-5. Test Set Rear Panel

Step 5. Repeat the test for the rest of the signal paths stated in Table 4-1.

MS4782X MM 4-11

TEST CHANNEL STEP ATTEN. CHECK TROUBLESHOOTING

Step 6. Reconnect all the inter-connect RF cables between the MS462XC Vec

Step 7. If Test A or Test B fails, replace A1 Port 1 Coupler (Figure 4-2).
Step 8. If Test C fails, replace:

Step 9. If Test D fails, replace A3 Coupler.

4-5 TEST CHANNEL STEP

ATTEN. CHECK

Setup: Turn on the MS462XC Vector Network Measurement System and the

Step 1. Press Default key and then 0 key.
Step 2. Press Seq key.
Step 3. Select:

tor Network Measurement System and MS4782X Test Set. Also
reconnect the Ext Pre Amp RF loop cable.

A2 Port 2 Coupler

q

A5A1 K240B Power Splitter

q

This test checks whether the Test Channel Step Attenuator functions
properly.

MS4782X Test Set and allow warm up 30 minutes.

-

TTL I/O
PARALLEL OUT SETUP
SET PARALLEL OUT PORT (0-255)

Step 4. Change the value from 0 to 8.
Step 5. Select:

RETURN
RETURN

Step 6. Press Display key.
Step 7. Select:

DISPLAY MODE
SINGLE CHANNEL
RETURN

Step 8. Press Ch 3 key and then Display key.
Step 9. Select:

GRAPH TYPE
LOG MAGNITUDE
RETURN

Step 10. Press Avg key.

4-12 MS4782X MM

TROUBLESHOOTING TEST CHANNEL STEP ATTEN. CHECK

Step 11. Select:

SELECT I.F. BANDWIDTH
I. F. BW 10 Hz

Test Procedure:

Step 1. Connect a through cable between Test Port 1 and Test Port 2.
Step 2. Select:

TRACE MEMORY

Step 3. Allow the trace to sweep twice. Select:

STORE DATA TO MEMORY
VIEW DATA (/) MEMORY
RETURN

Step 4. Select:

SCALE
10 dB/DIV

Step 5. Press Seq key.
Step 6. Select:

TTL I/O
PARALLEL OUT SETUP
SET PARALLEL OUT PORT (0-255)

Step 7. Change the SET PARALLEL OUT PORT value to 9.
Step 8. Verify whether the displayed S21 trace is within the range specified in

Table 4-2.

Table 4-2. Step Attenuator Specifications

PARALLEL OUT PORT VALUE Corresponding Step Attenuator Setting Expected Range

9 10dB 10±1dB
10 20dB 20±1dB
12 40dB 40±2dB

Step 9. Repeat Steps 7 and step 8 for the other PARALLEL OUT PORT values

in Table-4-2.

MS4782X MM 4-13

INT. TERM. RESISTANCE CHECK TROUBLESHOOTING

Step 10. If the test results are out of the expected range, replace:

Step Attenuator

q

Limiter

q

4-6 INT. TERM. RESISTANCE

CHECK

Test Procedure:

Step 1. For MS4782D, measure the DC resistance of the termination between

Step 2. Verify that the measured value is 50 ±5 ohms.
Step 3. If the measured value is out of the expected range, replace the termi-

This test checks whether the internal high power termination has
been overpowered.

the center conductor and the outer conductor of the Internal Termina
tion Input connector (C2) on the rear panel.

For the MS4782A:
Remove the cable between the termination and the internal circulator.
Measure the DC resistance between the center conductor and the
outer conductor of the termination connector.

nation (Figure 4-2).

4-7 TROUBLESHOOTING The following paragraphs provide suggestions for troubleshooting cer-

tain test set components.

If Test Set Does Not

Power Up

Check as follows:

-

Step 1. If the MS4782X Test Set does not power up when connected to an AC

power source and the Power key is pressed, perform the power supply
checks described below.

WARNING

Harzardous voltages are presented inside the instrument
when AC line power is connected. Turn off the instrument
and remove the line cord before removing any covers or
panels. Troubleshooting or repair procedures should only
be performed by service personnel who are fully aware of
the potential hazards.

Line Source And In

terface Checks

Step 1. Verify that AC power source is providing stable power at the correct

-

Check as follows:

line voltage.

4-14 MS4782X MM

TROUBLESHOOTING TROUBLESHOOTING

Note

The MS4782X is designed to automatically sense and oper
ate with AC line voltage in the range of 85 – 264 VAC,
with a frequency of 47 – 63 Hz.

Step 2. Verify that power input cord is in good condition.
Step 3. Verify that the power line fuse is installed, that it is not blown (open),

and that it is the correct value (1.6A, Slow blow, part number 631-81).

-

Power Supply
Voltage Check

Step 1. Turn off the Test Set, and disconnect the power cord from the instru

Step 2. Remove the top cover.
Step 3. Reconnect the power cord to the Test Set and turn it on.
Step 4. Using DMM or oscilloscope, measure the DC power supply voltage

Step 5. Connect the DMM or oscilloscope to the TEST POINTS on the Control

Step 6. If any of the DC voltage tests fails, replace the A6 DC power supply.

Check as follows:

­ment. Ensure all external cable connections to the Test Set front and
rear panel are also disconnected.

listed in Table 4-3.

Table 4-3. Power Supply Voltages

Measured Pin Common Pin DC Supply Voltage

TP2 TP1 +5 ± 0.05V
TP3 TP1 +24 ± 2.4 V
TP4 TP1 +15 ± 0.9 V

-

ler PCB assembly (Figure 4-1).

Refer to Figure-4-6 Part Location Diagram.

If the PATS Fails the

Return Loss

Confidence Tests

Step 1. Use a different Calibration Kit for measurement calibration and re

Step 2. Verify the performance of the MS462XC per Chapter 3 of the MS462XX Mainte

Check as follows:

­peat the Return Loss Confidence Test. This step determines whether
the Calibration Kit is the cause of the failure.

nance Manual (part number 10410-00205). This step determines whether the
MS462XC is the cause of the failure.

MS4782X MM 4-15

-

TROUBLESHOOTING TROUBLESHOOTING

Figure 4-6. A6 Power Supply Parts Location Diagram

Step 3. Perform Coupler Check (page 4-9).

4-16 MS4782X MM

TROUBLESHOOTING TROUBLESHOOTING

If the PATS Fails the

System Dynamic Range

Test

Step 1. Verify the performance of the MS462XC per Chapter 3 of the

Step 2. Perform Test C of the Coupler Check (page 4-11).

If the PATS Fails the

Receiver Display Linearity

Test

Step 1. Verify the performance of the MS462XC per Chapter 3 of the

Step 2. Perform Test C of the Coupler Check (page 4-11).

Check as follows:

MS462XX Maintenance Manual (part number 10410-00205). This
step determines whether the MS462XC is the cause of the failure.

Check as follows:

MS462XX Maintenance Manual (part number 10410-00205). This
step determines whether the MS462XC is the cause of the failure.

MS4782X MM 4-17/4-18

Chapter 5 Remove and Replace Procedures

Table of Contents

5-1 INTRODUCTION .........................5-3

5-2 EQUIPMENT REQUIRED ....................5-3

5-3 A1, A2, A3 COUPLER .......................5-6

5-4 A4 COMBINER ..........................5-7

5-5 A5 STEP ATTENUATOR .....................5-8

5-6 A6 POWER SUPPLY .......................5-9

5-7 A7 CIRCULATOR (MS4782A)..................5-11

5-8 A8 HIGH POWER TERMINATION...............5-12

5-9 A9 SYSTEM CONTROL PCB .................5-13

5-10 FAN ASSEMBLY.........................5-14

Chapter 5
Remove and Replace
Procedures

5-1 INTRODUCTION This chapter provides procedures for removing and reinstalling the re

placeable subassemblies listed in Chapter 2, Table 2-2.

5-2 EQUIPMENT REQUIRED All procedures in this chapter require the use of either a #1 or #2 size

Phillips type screw driver. Most procedures require the use of a 5/16
inch wrench and the Anritsu 01-201 (8 in./pounds) Torque Wrench.

5-3 COVERS Troubleshooting operations require removal of the top cover. Replace-

ment of some Test Set assemblies and parts require removal of all cov­ers. The following procedure describes this process.

NOTE

It is only necessary to loosen the Test Set handle assem­blies to remove the top, bottom, or side covers. However, if
the front panel is to be removed, remove the handle as­semblies at this time.

Preliminary:

q

Switch the Test Set power off and remove the power cord.

Procedure:

Step 1. Loosen (or remove) the right and left handle assemblies, as follows:

-

n

Place the Test Set on its top (bottom-side up).

n

Loosen/remove the screws at the sides of the handle as
semblies.

n

If removing handles, pull them away from unit and set
aside.

The green headed screws have Metric
threads.

Step 2. To remove the top cover:

n

Place the Test Set in normal (top-side up) position.

CAUTION

-

MS4782X MM 5-3

COVERS REMOVE AND REPLACE

Remove the feet from the two top corners at the rear of

n

the Test Set (Figure 5-1).

Lift and slide cover back and
remove

Remove screw
from each side.

Remove
center screw

Figure 5-1. Top/Bottom Cover Removal

n Remove the center screw from rear of the top cover.
n Lift and slide the top cover away from the Test Set.

Step 3. To remove the bottom cover:

n

Place the Test Set on its top (bottom-side up).

n

Remove the feet from the two bottom corners at the rear
of the Test Set.

n

Remove the center screw from rear of the bottom cover.

n

Lift and slide the top cover away from the Test Set.

Remove green
screw from each
side.

5-4 MS4782X MM

REMOVE AND REPLACE COVERS

Step 4. To remove the left cover:

Place the Test Set on its right side.

n

Remove the feet from the two left-side corners at the

n

rear of the Test Set.
Remove the center screw from the left cover (Figure 5-2).

n

Remove
center screw

Figure 5-2. Side Cover Removal

n

Lift and slide the side cover away from the Test Set.

Step 5. To remove the right cover:

n

Place the Test Set its left side.

n

Remove the feet from the two right-side corners at the
rear of the Test Set.

n

Remove the center screw from rear of the right side
cover.

n

Lift and slide the side cover away from the Test Set.

To replace the instrument covers, perform the steps above in the re
verse order.

Remove screw
from each foot.

Remove green
screw from each
foot.

-

MS4782X MM 5-5

A1, A2, A3 COUPLER REMOVE AND REPLACE

5-4 A1, A2, A3 COUPLER This paragraph provides a procedure for removing and replacing the

A1, A2, or A3 Coupler.

Step 1. Remove top cover (paragraph 5-3).
Step 2. Disconnect the three connectors (Figure 5-3).
Step 3. Remove four screws.
Step 4. Remove coupler.

To replace coupler, reverse the order in the removal procedure.

A3Coupler

Figure 5-3. A1, A2, or A3 Coupler Removal

A3

Disconnect

Remove 4
screws

A1

A2

A1 Coupler

Disconnect

A2 Coupler

Disconnect

5-6 MS4782X MM

REMOVE AND REPLACE A4 COMBINER

sconnec

5-5 A4 COMBINER This paragraph provides a procedure for removing and replacing the

A4 Combiner.

Step 1. Remove top cover (paragraph 5-3).
Step 2. Disconnect the three connectors (Figure 5-4).
Step 3. Remove four screws.
Step 4. Remove combiner.
Step 5. To replace combiner, reverse the order in the removal procedure.

A4 Combiner

Figure 5-4. A4 Combiner Removal

Disconnect

Di

Disconnect

A4

Remove 4
screws

t

MS4782X MM 5-7

A5 STEP ATTENUATOR REMOVE AND REPLACE

5-6 A5 STEP ATTENUATOR This paragraph provides a procedure for removing and replacing the

A5 Step Attenuator and A5A2 RF Limiter.

Step 1. Remove top cover (paragraph 5-3).
Step 2. Disconnect the A5A2 RF Limiter from the step attenuator (Figure 5-5).
Step 3. Disconnect the fixed attenuator from the step attenuator.
Step 4. Disconnect the ribbon-cable connector from the step attenuator.
Step 5. Remove two screws.
Step 6. Remove step attenuator.

To replace step attenuator, reverse the order in the removal proce
dure.

A5 Step Attenuator

A5A2 RF Limiter

A5A2

A5

Disconnect

Remove 2
screws

Disconnect

Disconnect

Km

to Km

Adapter

A5A1 Power Divider

-

Figure 5-5. A5 Step Attenuator Removal

5-8 MS4782X MM

REMOVE AND REPLACE A6 POWER SUPPLY

5-7 A6 POWER SUPPLY This paragraph provides a procedure for removing and replacing the

A6 Power Supply.

Step 1. Remove top cover and bottom covers (paragraph 5-3).
Step 2. Disconnect three wiring connectors from power supply (Figure 5-6).
Step 3. Set Test Set on its front handles.
Step 4. Grasp the the power supply to hold it in place while removing the four

screws from the underside (Figure 5-7).

Step 5. Remove power supply

To replace power supply, reverse the order in the removal procedure.

A6 Power Supply

Disconnect

Disconnect

A6

Disconnect

Figure 5-6. A6 Power Supply Removal (Bottom View)

MS4782X MM 5-9

A6 POWER SUPPLY REMOVE AND REPLACE

F

l

rontPane

Remove 4
round-head
screws

Rear Panel

Figure 5-7. A6 Power Supply Removal (Bottom View)

5-10 MS4782X MM

REMOVE AND REPLACE A7 CIRCULATOR (MS4782A)

5-8 A7 CIRCULATOR

(MS4782A)

This paragraph provides a procedure for removing and replacing the
A7 Circulator on the MS4782A Test Set.

Step 1. Remove top cover cover (paragraph 5-3).
Step 2. Disconnect semirigid cables in three places (Figure 5-8).
Step 3. Remove four mounting screws.
Step 4. Remove circulator and bracket.
Step 5. Remove circulator from bracket.
Step 6. To replace high power termination, reverse the order in the removal

procedure.

Remove 4
screws

Remove 3
connectors

Figure 5-8. A7 Circulator Removal

A7

MS4782X MM 5-11

A8 HIGH POWER TERMINATION REMOVE AND REPLACE

screws

5-9 A8 HIGH POWER

TERMINATION

Disconnect

A8 High Power
Termination

This paragraph provides a procedure for removing and replacing the
A8 High Power Termination.

Step 1. Remove top cover (paragraph 5-3).
Step 2. Disconnect the cable connector from the termination (Figure 5-9).
Step 3. Remove the four screws, and remove the termination.

To replace high power termination, reverse the order in the removal
procedure.

A8

Remove 4

Figure 5-9. A8 High Power Termination Removal

5-12 MS4782X MM

REMOVE AND REPLACE A9 SYSTEM CONTROL PCB

5-10 A9 SYSTEM CONTROL

PCB

Step 1. Remove top cover (paragraph 5-3).
Step 2. Disconnect six wiring connectors from the A9 PCB (Figure 5-10).
Step 3. Remove the four corner screws, and remove the A9 PCB.

To A10 SPDT

Remove 4 screws

To A6 Power Supply

Not Used

This paragraph provides a procedure for removing and replacing the
A9 System Control PCB.

To replace A9 PCB, reverse the order in the removal procedure.

To Rear Panel Control In connector

To A5 Step Attenuator

P3 J1 J2

P1

A9

J5J4

To Front Panel LED

To Fan Assembly

J3

Remove all connectors

Figure 5-10. A9 System Control PCB Removal

A9

MS4782X MM 5-13

FAN ASSEMBLY REMOVE AND REPLACE

5-11 FAN ASSEMBLY This paragraph provides a procedure for removing and replacing the

rear panel fan assembly.

Step 1. Remove top, bottom, and both side covers (paragraph 5-3).
Step 2. Remove four thumb nuts holding fan guard in place (Figure 5-11).
Step 3. Remove fan guard.
Step 4. With Test Set right-side up, remove the center screws from each side

(Figure 5-12).

Step 5. Carefully lower the rear panel to gain access to the four fan corner

screws.

Step 6. Remove the four screws, and lift the fan out.

To replace fan, reverse the order in the removal procedure.

Remove 4 thumb nuts

Figure 5-11. Fan Guard Removal

Remove fan guard

5-14 MS4782X MM

REMOVE AND REPLACE FAN ASSEMBLY

Remove screw
from each side

Figure 5-12. A5 Step Attenuator Removal

MS4782X MM 5-15/5-16

Appendix A Connector Maintenance Check Procedures

Table of Contents

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

A-2 PRECAUTIONS .........................A-3

Pin Depth Problems ························A-3
Pin-Depth Tolerance ·······················A-4
Avoid Over Torquing Connectors ················A-4
Teflon Tuning Washers ······················A-4
Avoid Mechanical Shock ·····················A-4
Keep Connectors Clean ······················A-4
Visual Inspection ·························A-5

A-3 REPAIR/ MAINTENANCE...................A-5

Appendix A

0

1

2

3

4

5

1

2

3

4

2

11

2

Connector Maintenance
Check Procedures

A-1 INTRODUCTION This appendix provides general, precautionary information and in

-

structions pertaining to precision connectors.

A-2 PRECAUTIONS The following paragraphs are precautionary notes relating to mainte

nance considerations for precision connectors

Pin Depth Problems Based on ANRITSU precision components returned for repair, destruc

tive pin depth of mating connectors is the major cause of failure in the

REFERENCE

PLANE

PIN

DEPTH

(INCHES)

FEMALE

REFERENCE

PLANE

(INCHES)

PIN

DEPTH

MALE

Figure A-1. N Connector Pin Depth

Definition

field. When a precision component is mated with a connector having a
destructive pin depth, damage will likely occur to the precision compo­nent’s connector. A connector is considered to have destructive pin
depth when the center pin is too long in respect to the connector’s ref­erence plane (Figure C-1).

Before mating an unknown or new device with your Test Set Port con­nectors or calibration devices, always measure the pin depth of the de­vice’s connectors. Use a ANRITSU Pin Depth Gauge, or equivalent, for
these measurements (Figure C-2). Also, measure the connector
pin-depth of a device when intermittent or degraded performance is
suspected.

Gauging sets for measuring the pin-depth of precision connectors are
available from your nearest ANRITSU Service center, or from the fac
tory. Instructions for measuring connector pin-depth are included with
the gauging set(s).

-

-

-

Figure A-2. Pin Depth Gauge

MS4782X MM A-3

PRECAUTIONS APPENDIX A

Pin-Depth Tolerance The center pin of a precision connector has a tolerances measured in

mils (one mil = 1/1000 inch). The connectors of test devices may not be
precision types and they may not have the proper pin-depth. These
connectors should be measured before mating to ensure suitability.

When gauging pin depth, if the connector being measured indicates
out of tolerance in the “+” region of the gauge (Table C-1), the center
pin is too long. Mating under this condition will likely damage the
mating connector. On the other hand, if the test device connector indi
cates out of tolerance in the “–” region, the center pin is too short.
While this will not cause any damage, it will result in a poor connec
tion and a consequent degradation in performance.

Table A-1. Connector Pin-Depth Tolerance

-

-

Avoid Over Torquing

Connectors

Teflon Tuning

Washers

Port/

Conn. Type

GPC-7

N Male

N Female

3.5 mm Male, Female

K Male, Female

V Male

V Female

Pin Depth

(MILS)

+0.000

–0.003
–0.000

20

+0.004

7

–0.004

20

+0.000

7

–0.000
+0.002

+0.0000
–0.0035

+0.000

to –0.001

+0.000

to –0.001

Gauge

Reading

Same As

Pin Depth

20

7

Same As

Pin Depth

+0.000
–0.004

Over-torquing connectors is destructive; it may damage the connector
center pin. Finger-tight is usually sufficient, especially on Type N con
nectors. Should it be necessary to use a wrench to tighten SMA or
WSMA connectors, use a torque wrench that breaks at 8 inch-pounds.
As a general rule, never use pliers to tighten connectors.

The center conductor on many precision connectors contains a small
teflon tuning washer located near the point of mating (interface). This
washer compensates for minor impedance discontinuities at the inter
face. The washer’s location is critical to the connector’s performance.

Do not disturb it.

-

-

Avoid Mechanical

Shock

Precision connectors are designed to withstand years of normal bench
handling. Do not drop or otherwise treat them roughly. They are labo
ratory-quality devices, and like other such devices, they require care

-

ful handling.

Keep Connectors

Clean

The precise geometry that makes a precision connector’s high perfor
mance possible can be disturbed by dirt and other contamination ad

-

-

A-4 MS4782X MM

-

APPENDIX A REPAIR/ MAINTENANCE

hering to connector interfaces. When not in use, keep the connectors
covered.

Visual Inspection Precision connectors should be inspected periodically. Check for the

following:

Bent or broken center pin

q

Damaged threads

q

Other bent or damaged connector parts

q

Dirt or foreign material in connector cavity.

q

A-3 REPAIR/

MAINTENANCE

ANRITSU recommends that no maintenance other than cleaning be
attempted by the customer. Any device with a suspected defective con
nector should be returned to ANRITSU for repair and/or service when
needed.

-

MS4782X MM A-5/A-6

Index

INDEX A TO P

Index

A

A1, A2, A3 COUPLER ·············5-6
A4 COMBINER ·················5-7
A5 STEP ATTENUATOR············5-8
A6 POWER SUPPLY···········5-9-5-10
A7 CIRCULATOR ···············5-11
A8 HIGH POWER TERMINATION ·····5-12
A9 SYSTEM CONTROL PCB ········5-13
Acrobat Reader ·················1-3
Adobe Acrobat··················1-3
ANRITSU Service Centers ········1-10,2-4
Avoid Mechanical Shock ············A-4
Avoid Over Torquing Connectors ·······A-4
Avoid Over Torquing Connectors ·······A-4

B

Bandwidth····················1-9

C

CDROM·····················1-3
COMBINER CHECK ···········4-3-4-8
Connector Maintenance

Cleaning ···················A-4
INTRODUCTION ··············A-3
Mechanical Shock ··············A-4
Pin Depth Problems ·············A-3
Pin Depth Tolerances ············A-4
Precautions··················A-3
Repair/Maintenance ·············A-5
Teflon Tuning Washer············A-4
Torque ····················A-4

Visual Inspection···············A-5
Connectors and Ports ··············1-9
CONVENTIONS ················3-3
COUPLER CHECK ···········4-9-4-11
COVERS ··················5-3-5-5

D

DRA Scorpion ················1-7,1-9

E

Electro-static discharge procedures······1-10

EQUIPMENT REQUIRED ···········5-3
EXCHANGE ASSEMBLY PROGRAM·····2-3

F

FAN ASSEMBLY ············5-14 - 5-15

H

HARDWARE DESCRIPTION ······1-4-1-6

I

IDENTIFICATION NUMBER ·········1-3
INT. TERM. RESISTANCE CHECK ·····4-14
INTRODUCTION········1-3,2-3,3-3,4-3,5-3
Isolation ·····················1-9

K

Keep Connectors Clean·············A-4

M

Major Assemblies Location Diagram
(Top View) ·················2-5,4-8
MANUAL SCOPE················1-3
MS4782X Test Set················1-7

O

ONLINE MANUAL ···············1-3
OPERATIONAL CHECK ············4-3

P

PARTS ORDERING INFORMATION · · 2-4 - 2-5
PATS SYSTEM OVERVIEW ··········1-3
Pin Depth

Problems ···················A-3

Tolerances ··················A-4
Pin Depth Problems ··············A-3
Pin-Depth Tolerance ··············A-4
Power rating···················1-9
Precautions ···················A-3
PRECAUTIONS ·············A-3-A-4

372XXB MM Index-3

R TO V INDEX

R

RECEIVER DISPLAY LINEARITY · · 3-11 - 3-13
RECOMMENDED TEST EQUIPMENT1-10 - 1-11
Remove and Replace

Equipment Required ·············5-3

Remove and Replace Procedures

A1, A2, A3 Couplers ·············5-6
A4 Combiner ·················5-7
A5 Step Attenuator··············5-8
A6 Power Supply ···········5-9-5-10
A7 Circulator ················5-11
A8 High Power Termination ········5-12
A9 System Control PCB ··········5-13
Covers ··················5-3-5-5

Fan Assembly ············5-14 - 5-15
REPAIR/ MAINTENANCE···········A-5
Replaceable Subassemblies···········2-4
REPLACEABLE SUBASSEMBLIES AND
PARTS······················2-3
RETURN LOSS CONFIDENCE TEST· · 3-6 - 3-8

S

Scope of Manual·················1-3
SCOPE OF MANUAL··············1-3
SERVICE CENTERS ·············1-10
SOURCE OUTPUT ACCURACY········3-5
STATIC SENSITIVE COMPONENT
HANDLING PROCEDURES ·········1-10
SYSTEM DESCRIPTION ·········1-7-1-9
SYSTEM DYNAMIC RANGE ······3-9-3-10

T

Teflon Tuning Washers·············A-4
Teflon Tuning Washers ············A-4
TEST CHANNEL STEP ATTEN. CHECK · 4-12 ­4-13
TEST EQUIPMENT············3-3-3-4
TEST EQUIPMENT ···········3-3-3-4
Torquing Connectors ··············A-4
Troubleshooting

Power Supply Voltage Check········4-15
TROUBLESHOOTING ·········4-14 - 4-17
Troubleshooting Checks

If Test Set Does Not Power Up · · · 4-14 - 4-17

If the PATS Fails the Receiver Display Linearity

Test ·····················4-17

If the PATS Fails the Return Loss Confidence

Tests·····················4-15

If the PATS Fails the System Dynamic

Range Test ·················4-17

Line Source and Interface Checks ·····4-14
Troubleshooting Procedures

Combiner Check ············4-3-4-8

Coupler Check·············4-9-4-11

Internal Termination Check ········4-14

Test Channel Step Attenuator

Check ·················4-12 - 4-13

V

Visual Inspection ················A-5

Index-4 372XXB MM