TROUBLESHOOTING INDEX -820360111

TM 9-1240-375-34&P

0023 00

DIRECT SUPPORT

M172/M172A1 TELESCOPE AND QUADRANT MOUNT

(1240-01-037-7290/1240-01-517-2171)

TROUBLESHOOTING INDEX

INTRODUCTION

a. The troubleshooting procedures are limited to those listed in the troubleshooting symptom index.

The table lists the common malfunctions, which you may find during the operation or maintenance of the

M172/M172A1 Telescope and Quadrant Mount. You should perform the tests/inspections and corrective

actions in the order listed.

b. This manual cannot list all malfunctions that may occur, or all tests or inspections and corrective

actions. If a malfunction is not listed or is not corrected by listed corrective actions, notify your supervisor.

c. Each work package is headed by an initial setup. This setup outlines what is needed as well as

certain conditions, which must be met before starting the task. DON'T START A TASK UNTIL:

You understand the task;

You understand what you are to do;

You understand what is needed to do the work;

You have the things you need.

MALFUNCTION/SYMPTOM INDEX

a. The malfunction/symptom index is a quick reference index for finding troubleshooting procedures.

Associated with each symptom name is a work package sequence number representing the starting point in

the troubleshooting sequence. Should any one symptom require more than one troubleshooting sequence to

arrive at the most likely area of investigation, the additional starting point numbers are presented.

b. As the troubleshooting activity progresses to the conclusion of a particular sequence, a reference is

made to the next logical troubleshooting sequence by work package sequence number or by referring to the

malfunction/symptom index to locate the next failure symptom work package. This type of activity

continues until successful fault isolation is achieved.

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