Section V. TROUBLESHOOTING

TM 11-5895-1141-34

Section V. TROUBLESHOOTING

SECTION CONTENTS

Page

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

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

4-12.

GENERAL

a. Troubleshooting may be viewed as occurring at two distinct levels. The first level involves locating and repairing

those malfunctions that result in an inoperative system which requires immediate attention. The symptoms are readily

apparent and the fault must be localized to a particular module or assembly so as to facilitate repair. The faulty module

may then be replaced to restore system operation, minimizing "down" time. The malfunctioning module may be installed in

the MTS-2400 module test set for testing and troubleshooting.

The following tables in this chapter can be of assistance in localizing and locating the first level malfunctions:

c. Tables 4-1, 2, 3, 4. These tables contain normal voltage measurements taken at key points in the system

modules. Comparison of voltage measurements can help to localize malfunctions.

Table 4-5. This table contains normal resistance measurements taken in the selector module.

e. Table 4-18. This table is located in this section and contains a comprehensive list of gross malfunctions that

could occur in the system. The faults or symptoms resulting from these malfunctions as well as a tabulation of checks and

procedures for troubleshooting them are included in the table. The malfunctions are localized to three board circuit areas;

transmitting circuits, receiving circuits, and lamp displays.

A second level of troubleshooting involves those malfunctions that degrade system performance, but the system

remains operational. These malfunctions can be detected and repaired using the system test procedures described in

section II and section III of this chapter.

g. The circuit schematic diagrams, circuit board assembly and wiring diagrams and unit wiring diagrams provided

in this manual (APPENDIX A) should all be used to facilitate module troubleshooting.

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