IFR COM-120C Service Manual

An Aeroflex Company

COM-120C Communications

Service Monitor

Maintenance Manual Supplement

1002-0601-4P0

advancing wireless test

MAINTENANCE MANUAL SUPPLEMENT

COMMUNICATIONS SERVICE MONITOR

COM-120C

PUBLISHED BY

IFR

COPYRIGHT
All rights reserved. No part of this publication may be reproduced, stored in a retrieval
system, or transmitted in any form or by any means, electronic, mechanical, photocopying,
recording or otherwise without the prior permission of the publisher.

 IFR 2003

10200 West York / Wichita, Kansas 67215 U.S.A. / [phone] / FAX [phone]

WARNING:

HIGH VOLTAGE EQUIPMENT

THIS EQUIPMENT CONTAINS CERTAIN CIRCUITS AND/OR
COMPONENTS OF EXTREMELY HIGH VOLTAGE POTENTIALS,
CAPABLE OF CAUSING SERIOUS BODILY INJURY OR DEATH. WHEN
PERFORMING ANY OF THE PROCEDURES CONTAINED IN THIS

MANUAL, HEED ALL APPLICABLE SAFETY PRECAUTIONS.

SAFETY FIRST: TO ALL SERVICE PERSONNEL

REFER ALL SERVICING OF UNIT TO QUALIFIED TECHNICAL PERSONNEL.

CASE, COVER OR PANEL REMOVAL

Removing protective covers, casings or panels from this unit exposes the technician to electrical hazards that
can result in electrical shock or equipment damage.

SAFETY IDENTIFICATION IN TECHNICAL MANUAL

This manual uses the following terms to draw attention to possible safety hazards, that may exist when
operating or servicing this equipment.

CAUTION: THIS TERM IDENTIFIES CONDITIONS OR ACTIVITIES THAT, IF IGNORED, CAN RESULT IN

EQUIPMENT OR PROPERTY DAMAGE (e.g., FIRE).

WARNING: THIS TERM IDENTIFIES CONDITIONS OR ACTIVITIES THAT, IF IGNORED, CAN RESULT IN

PERSONAL INJURY OR DEATH.

SAFETY SYMBOLS IN MANUALS AND ON UNITS

CAUTION: Refer to accompanying documents.

AC TERMINAL: Terminal that may supply or be supplied with ac or alternating voltage.

SWITCH OFF: AC line power to the device is OFF.

SWITCH ON: AC line power to the device is ON.

DANGEROUS VOLTAGE: Indicates electrical shock hazard due to high voltage levels.

EQUIPMENT GROUNDING PRECAUTION

Improper grounding of equipment can result in electrical shock.

USE OF PROBES

Check the specifications for the maximum voltage, current and power ratings of any connector on the unit
before connecting it with a probe from a terminal device. Be sure the terminal device performs within these
specifications before using it for measurement, to prevent electrical shock or damage to the equipment.

POWER CORDS

Power cords must not be frayed or broken nor expose bare wiring when operating this equipment.

USE RECOMMENDED FUSES ONLY

Use only fuses specifically recommended for the equipment at the specified current and voltage ratings.

CAUTION: INTEGRATED CIRCUITS AND SOLID STATE DEVICES SUCH AS MOS FETS, ESPECIALLY CMOS

TYPES, ARE SUSCEPTIBLE TO DAMAGE BY ELECTROSTATIC DISCHARGES RECEIVED FROM
IMPROPER HANDLING, THE USE OF UNGROUNDED TOOLS AND IMPROPER STORAGE AND
PACKAGING. ANY MAINTENANCE TO THIS UNIT MUST BE PERFORMED WITH THE FOLLOWING
PRECAUTIONS:

● BEFORE USE IN A CIRCUIT, KEEP ALL LEADS SHORTED TOGETHER EITHER BY THE USE OF
VENDOR-SUPPLIED SHORTING SPRINGS OR BY INSERTING LEADS INTO A CONDUCTIVE
MATERIAL.

● WHEN REMOVING DEVICES FROM THEIR CONTAINERS, GROUND THE HAND BEING USED
WITH A CONDUCTIVE WRISTBAND.

● TIPS OF SOLDERING IRONS AND/OR ANY TOOLS USED MUST BE GROUNDED.

● DEVICES MUST NEVER BE INSERTED INTO NOR REMOVED FROM CIRCUITS WITH POWER

ON.

● PC BOARDS, WHEN TAKEN OUT OF THE SET, MUST BE LAID ON A GROUNDED CONDUCTIVE
MAT OR STORED IN A CONDUCTIVE STORAGE BAG. REMOVE ANY BUILT-IN POWER
SOURCE, SUCH AS A BATTERY, BEFORE LAYING PC BOARDS ON A CONDUCTIVE MAT OR
STORING IN A CONDUCTIVE BAG.

● PC BOARDS, IF BEING SHIPPED TO THE FACTORY FOR REPAIR, MUST BE PACKAGED IN A
CONDUCTIVE BAG AND PLACED IN A WELL-CUSHIONED SHIPPING CONTAINER.

CAUTION

THIS EQUIPMENT CONTAINS PARTS

SENSITIVE TO DAMAGE

BY ELECTROSTATIC DISCHARGE (ESD)

CAUTION: SIGNAL GENERATORS CAN BE A SOURCE OF ELECTROMAGNETIC INTERFERENCE (EMI) TO

COMMUNICATION RECEIVERS. SOME TRANSMITTED SIGNALS CAN CAUSE DISRUPTION AND
INTERFERENCE TO COMMUNICATION SERVICES OUT TO A DISTANCE OF SEVERAL MILES.
USERS OF THIS EQUIPMENT SHOULD SCRUTINIZE ANY OPERATION THAT RESULTS IN
RADIATION OF A SIGNAL (DIRECTLY OR INDIRECTLY) AND SHOULD TAKE NECESSARY
PRECAUTIONS TO AVOID POTENTIAL COMMUNICATION INTERFERENCE PROBLEMS.

CAUTION: KEEP ALL VENT OPENINGS CLEAR AND UNOBSTRUCTED FOR PROPER EQUIPMENT COOLING

AND CONTINUED RELIABILITY. DO NOT OPERATE EQUIPMENT IN THE VERTICAL POSITION ON
PLUSH CARPET OR UPHOLSTERY TO AVOID IMPAIRING THE AIR EXHAUST. WHEN OPERATING
THE TEST SET IN THE NORMAL HORIZONTAL OR TILT BAIL POSITION, MAINTAIN AT LEAST

1.6 INCHES (FOUR CENTIMETERS) OF CLEARANCE BETWEEN THE EQUIPMENT REAR EXHAUST

FAN SCREEN AND OBJECTS OR WALLS.

PREFACE

SCOPE

This Maintenance Manual Supplement, containing maintenance information for the COM-120C,
is intended to be used in conjunction with the COM-120B Maintenance Manual.

ORGANIZATION

The COM-120C Maintenance Manual Supplement is composed of the following:

Paragraph Title Page

SECTION 1 - DRAWINGS

System Block Diagram....................................................................................... 1-3

Composite Assembly ......................................................................................... 1-6

System Interconnect Diagram............................................................................. 1-13

Front Panel Assembly ....................................................................................... 1-16

Front Panel Assembly Interconnect Diagram........................................................ 1-19

SECTION 2 - PARTS LIST

Composite Assembly ......................................................................................... 2-1

i

THIS PAGE INTENTIONALLY LEFT BLANK.

ii

SECTION 1 – DRAWINGS

FIGURE TITLE PAGE

1-1 COM-120C System Block Diagram 1-3
1-2 Composite Assembly (7003-0647-200) 1-6
1-3 System Interconnect Diagram (0000-0647-200) 1-13
1-4 Front Panel Assembly (7005-0647-100) 1-16
1-5 Front Panel Assembly System Interconnect Diagram (0000-0647-100) 1-18

1-1

THIS PAGE INTENTIONALLY LEFT BLANK.

1-2

Figure 1-1 COM-120C System Block Diagram

(Sheet 1 of 3)

1-3