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TM-9-2350-311-20-1 Maintenance Manual for Volume 1 M109 Hull Download

Page 450 of 1275

TM 9-2350-311 -20-1 3-3 TROUBLESHOOTING CHART — CONTINUED af. VENTILATED FACE PIECE SYSTEM CIRCUIT — (5) AIR PURIFIER, DRIVER’S AND CANNONEER NO. 2 CONTINUED NBC HEATERS FAIL TO OPERATE — CONTINUED CONTINUED FROM STEP B I C 1. 2. 3. 4. 5. Reconnect lead 438 to NBC switch. Disconnect lead 438 from circuit breaker output. Place red lead of multimeter on circuit breaker output and black lead to ground. Turn MASTER switch ON and check for voltage. Turn MASTER switch OFF. Is voltage present? I Repair or replace lead 438 of NBC switch-to-circuit breaker lead assembly (para 8-86). D 1. Reconnect lead 438 to circuit breaker output. 2. Disconnect lead 10 from circuit breaker input. 3. Place red lead of multimeter in lead 10 and black lead to ground. 4. Turn MASTER switch ON and check for voltage. 5. Turn MASTER switch OFF. Is voltage present? I I Replace circuit breaker (para 8-34). I I Repair or replace lead 10 of power lead assembly (para 8-56). END OF TASK 3-350