TM-9-6920-430-14

COOLANT RECHARGING UNIT, TRAINING GUIDED MISSILE SYSTEM M80 AND CHARGER, BATTERY PP-7309/T

TECHNICAL MANUAL; OPERATOR’S AND ORGANIZATIONAL DIRECT SUPPORT, AND GENERAL SUPPORT MAINTENANCE MANUAL

AUGUST 1980

TM-9-6920-430-14 - Page 115 of 180

Table 3-3.

CPU Troubleshooting

MALFUNCTION

TEST OR INSPECTION

CORRECTIVE ACTION

TM 9-6920-430-14

Guidance Chart (Continued)

IF GPU DOES NOT START WITH AC POWER APPLIED AND THE SAFETY

COVER IS PROPERLY SECURED, THE SAFETY INTERLOCK SWITCH, STARTER

RELAY, OR COMPRESSOR MOTOR MAY BE DEFECTIVE. USING AN

OHMMETER CHECK THE SAFETY INTERLOCK SWITCH FOR CONTINUITY

WITH BUTTON DEPRESSED. IF CONTINUITY IS NOT OBSERVED SWITCH IS

DEFECTIVE.

REPLACE DEFECTIVE SWITCH IN ACCORDANCE WITH PARA. 3-25.

REMOVE ACCESS COVER FROM MOTOR JUNCTION BOX, USING AN AC VOLT-

METER MEASURE MOTOR INPUT VOLTAGE ACROSS BLACK LEADS. IF

VOLTAGE IS NOT MEASURED ACROSS BLACK INPUT LEADS RELAY IS

DEFECTIVE.

REPLACE DEFECTIVE RELAY IN ACCORDANCE WITH PARA. 3-21 (PAGE 3-81).

IF 110 VAC IS MEASURED ACROSS MOTOR INPUT LEADS COMPRESSOR MOTOR

IS DEFECTIVE

REPLACE COMPRESSOR ASSEMBLY IN ACCORDANCE WITH PARA. 3-18

(PAGE 3-76) .

2. GPU FAILS TO STOP WHEN OFF PUSHBUTTON IS DEPRESSED.

IS OFF SWITCH DEFECTIVE?

LIFT SAFETY COVER, IF GPU STOPS OFF SWITCH IS DEFECTIVE.

REPLACE DEFECTIVE OFF SWITCH IN ACCORDANCE WITH PARA. 3-24.

M1416967B

Change 1

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