PRELIMINARY TROUBLESHOOTING PROCEDURES

TM 10-3930-660-24-1

TROUBLESHOOTING INTRODUCTION - CONTINUED

0004 00

PRELIMINARY TROUBLESHOOTING PROCEDURES - CONTINUED

NOTE

Fluid leaks are classified as either Class I, Class II or Class III.

Class I:

Seepage of fluid (as indicated by wetness or discoloration) not great enough to form drops.

Class II:

Leakage of fluid great enough to form drops, but not enough to cause drops to drip from item

being checked/inspected.

Class III:

Leakage of fluid great enough to form drops that fall from item being checked/inspected.

Visually check for ruptured fluid hoses or tubes and for Class II or Class III leaks.

Check for mechanical jamming or binding caused by rocks or other foreign matter.

Check fluid levels in subject area and service as required (TM 10-3930-660-10).

Ensure all applicable Operator Troubleshooting has been performed before proceeding.

EXPLANATION OF TROUBLESHOOTING TABLE COLUMNS

The columns in troubleshooting Tables in WP 0006 00 are defined as follows:

MALFUNCTION. Indicates fault that has occurred in system/equipment.

TEST OR INSPECTION. Indicates test or inspection to be performed to isolate probable cause for fault symptom.

CORRECTIVE ACTION. Indicates procedure to correct the problem.

Analyze the symptoms and conditions and to determine the most likely cause for the problem, then troubleshoot that cir-

cuit first. The more information you have concerning the problem, the easier it will be to troubleshoot.

Isolate to the subsystem level (in cases where more than one subsystem is involved); next isolate the problem to a single

circuit within the subsystem; then, isolate the problem to the faulty component using the Troubleshooting Symptom

Frayed, broken, loose or corroded wiring is a common source of problems in any electrical circuit. Always make visual

inspection before starting detail troubleshooting. Observe in particular contacts to ground. Components with case

grounds are especially troublesome.

CAUTION

When making continuity checks, make sure the test equipment is isolated from power source.

Most of checks made are voltage checks. Pay particular attention to voltages being checked in procedures. This equip-

ment is a 24 volt system. Instructions prior to the step instruct to disconnect at test point from the potential malfunction-

ing component. Once the check has been made, either repair the component or go to the referenced step. If going to

another step, reconnect connection or do as otherwise instructed, such as install jumper wires using jumper wire kit.

When ready to make the prescribed check, apply power to the circuit (if required). A helper may be required if the

switch or power source is out of reach. Release the power function prior to going on, to avoid damage to equipment.

END OF WORK PACKAGE

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