CHAPTER 2. Index

TM 11-5805-387-34-2

CHAPTER 2

INDEX

PAGE

GENERAL INFORMATION

General ...............................................................................................................................................................

2-1

Repair Parts, Tools, Test Equipment, and Materials ............................................................................................

2-1

SECTION II

TROUBLESHOOTING

General Information ............................................................................................................................................

2-4

Modem Bench Test Setup and Test Conditions ...................................................................................................

2-5

Troubleshooting Symptom Index .........................................................................................................................

2-7

Troubleshooting Chart .........................................................................................................................................

2-8

Test Point Measurements....................................................................................................................................

2-24

SECTION III

MAINTENANCE PROCEDURES

Removing and Replacing Modules ......................................................................................................................

2-27

Removing and Replacing Front Panel Assembly .................................................................................................

2-28

Removing and Replacing Printed Circuit Boards A6, A7, A8, A9 .........................................................................

2-29

Removing and Replacing Power Transistors Q1, Q2, Q3 ....................................................................................

2-29

Removing and Replacing Connectors and Chassis Components .........................................................................

2-30

SECTION IV

ADJUSTMENT PROCEDURES

General Instructions ............................................................................................................................................

2-33

Regulated Voltage Adjustment ............................................................................................................................

2-34

Loop Current Adjustment.....................................................................................................................................

2-35

BFO Frequency Limits Adjustment ......................................................................................................................

2-37

Scope Module A2 Centering Adjustment .............................................................................................................

2-38

Scope Module A2 Alignment ...............................................................................................................................

2-39

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