TM-9-2350-311-20-2 Maintenance Manual Volume 2 for M109 Cab Download
Page 238 of 828
TM 9–2350–311–20–2 3–126 3–3 TROUBLESHOOTING — CONTINUED j. NBC SYSTEM CIRCUIT — CONTINUED (2) NBC SYSTEM DOES NOT OPERATE. — CONTINUED 1. Place one multimeter lead on terminal A and the other lead on terminal B of circuit breaker CB1. 2. Check for continuity. Is continuity present? 1. Place one multimeter lead on terminal B of circuit breaker CB1 and other lead on terminal 2 of switch S1. 2. Check for continuity. Is continuity present? 1. Place one multimeter lead at terminal A of circuit breaker CB1 and other lead at input side of J1 connector on NBC control box assembly. 2. Check for continuity. Is continuity present? CONTINUED ON NEXT PAGE yes no C Repair wire 1 (para 17–4). yes no D Replace circuit breaker CB1 (para 17–4). yes no E Repair wire 3 (para 17–4). CONTINUED FROM STEP B TERMINAL A CIRCUIT BREAKER CB1 TERMINAL B – + – + – SWITCH S1 TERMINAL 2 WIRE 3 TERMINAL B CIRCUIT BREAKER CB1 NBC CONTROL BOX ASSEMBLY WIRE 1 + J1 CONNECTOR INPUT CIRCUIT BREAKER CB1 TERMINAL A