TM-9-2350-311-20-2 Maintenance Manual Volume 2 for M109 Cab Download
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TM 9–2350–311–20–2 3–125 j. NBC SYSTEM CIRCUIT — CONTINUED (2) NBC SYSTEM 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. Disconnect wire 100 from J1 connector on bottom of NBC control box assembly. 2. Turn MASTER switch to ON. 3. Place red multimeter lead in wire 100 and black lead to ground. 4. Check for voltage. Is battery voltage present? Troubleshoot contact arm assembly (para 3–3g.). yes no A B yes no Replace J1 connector (para 17–4). CONTINUED ON NEXT PAGE NBC CONTROL BOX ASSEMBLY + – 1. Turn MASTER switch to OFF. 2. Place one multimeter lead on output side and other lead to input side of J1 connector on NBC control box assembly. 3. Check for continuity. Is continuity present? J1 CONNECTOR INPUT J1 CONNECTOR OUTPUT J1 CONNECTOR WIRE 100 + –