TM-9-2350-311-20-2 Maintenance Manual Volume 2 for M109 Cab Download
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TM 9–2350–311–20–2 3–118 3–3 TROUBLESHOOTING — CONTINUED i. INTERCOMMUNICATION SYSTEM — CONTINUED (4) OPERATOR CANNOT COMMUNICATE AT GUNNER’S OR COMMANDER’S CONTROL BOX. — CONTINUED 1. Disconnect cable CX4723 at amplifier AM1780/VRC. 2. Place one multimeter lead in position 1 and other lead in position 2 for individual continuity checks. POSITION 1 POSITION 2 L L K K H H 3. Check for continuity. Is continuity present? yes no F CONTINUED FROM STEP E END OF TASK 1. Reconnect cable CX4723 at amplifier AM1780/VRC. 2. Place one multimeter lead on cable CX4723 pin A and other lead to ground. 3. Check for continuity. Is continuity present? Replace cable CX4723 (para 8–16). Replace control box (para 8–16). If malfunction per- sists, replace amplifier AM1780/VRC (para 8–16). Replace cable CX4723 (para 8–16). yes no G Replace control box (para 8–16). yes no POSITION 2 CABLE CX4723 CONNECTORS POSITION 1 POSITION 1 POSITION 1 POSITION 2 POSITION 2 + – CABLE CX4723 CONNECTORS CABLE CX4723 CONNECTORS CABLE CX4723 CONNECTOR PIN A