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TM-9-2350-311-20-2 Maintenance Manual Volume 2 for M109 Cab Download

Page 228 of 828

TM 9–2350–311–20–2 3–116 i. INTERCOMMUNICATION SYSTEM — CONTINUED (4) OPERATOR CANNOT COMMUNICATE AT GUN- NER’S OR COMMANDER’S CONTROL BOX. INITIAL SETUP Test Equipment Multimeter (item 6, Appx H) Tools Artillery and turret mechanic’s tool kit (SC 5180–95–CL–A12) Equipment Condition Amplifier AM 1780/VRC POWER switch to OFF (TM 9–2350–311–10) Vehicle MASTER switch to OFF (TM 9–2350–311–10) 1. Disconnect operator’s mic/headset from control box. 2. Connect mic/headset to a control box that is operating correctly. 3. Turn MASTER and amplifier AM 1780/VRC POWER switches to ON. 4. Operate mic/headset. Does mic/headset operate properly? yes no A Replace mic/headset. 1. Turn MASTER and amplifier AM1780/VRC POWER switches to OFF. 2. Place control box MONITOR switch to ALL and VOLUME to maximum. 3. Disconnect cable CX4723 from J801 or J804 connector. 4. Place one multimeter lead in socket L of J801 or J804 connector and other lead to pin B of J802 connector. 5. Check for continuity. Is continuity present? NOTE The following checks must be made on connectors J801 and J804. B CONTINUED ON NEXT PAGE + – J801 OR J804 CONNECTOR SOCKET L J802 CONNECTOR PIN B