TM-9-2350-311-20-2 Maintenance Manual Volume 2 for M109 Cab Download
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TM 9–2350–311–20–2 3–135 j. NBC SYSTEM CIRCUIT — CONTINUED (6) NBC CONTROL BOX ASSEMBLY INDICATOR LIGHT ILLUMINATES, BUT SECTION CHIEF’S M3 ELECTRICAL AIR HEATER DOES NOT OPERATE. INITIAL SETUP Applicable Configuration M109A4/M109A5 howitzers Test Equipment Multimeter (item 6, Appx H) Tools Artillery and turret mechanic’s tool kit (SC 5180–95–CL–A12) Equipment Condition Vehicle MASTER switch to OFF (TM 9–2350–311–10) CAB NBC POWER switch to OFF (TM 9–2350–311–10) 1. Turn MASTER and CAB NBC POWER switches to OFF. 2. Disconnect NBC power lead assembly at J2 connector on NBC control box assembly. 3. Place red multimeter lead in connector of wire 136D and black lead to pin F of NBC power lead assembly connector. 4. Check for continuity. Is continuity present? 1. Disconnect wire 136D from section chief’s M3 electrical air heater. 2. Turn MASTER and CAB NBC POWER switches to ON. 3. Place red multimeter lead in wire 136D and black lead to ground. 4. Check for voltage. Is battery voltage present? A yes no B CONTINUED ON NEXT PAGE WIRE 136D – + Replace M3 electrical air heater (para 15–2). NBC POWER LEAD ASSEMBLY CONNECTOR PIN F SECTION CHIEF’S HEATER WIRE 136D – + 1. Turn MASTER and CAB NBC POWER switches to OFF. 2. Disconnect NBC power lead assembly at J2 connector on NBC control box assembly. 3. Place red multimeter lead connector of wire 136D and black lead to pin F of NBC power lead assembly connector. 4. Check for continuity.