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

Page 225 of 828

TM 9–2350–311–20–2 3–113 CONTINUED FROM STEP L yes no M CONTINUED ON NEXT PAGE – + DRIVER’S CONTROL BOX 1. Reconnect cable CX9640 at driver’s control box. 2. Disconnect driver’s mic/headset from control box. 3. Connect mic/headset to a control box that is operating properly. 4. Turn MASTER and amplifier AM 1780/VRC POWER switches to ON. 5. Operate mic/headset. Does mic/headset operate properly? Replace mic/headset. 1. Turn MASTER and amplifier AM 1780/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? N NOTE The following checks must be made on J801 and J804 connectors. yes no Replace control box (para 8–16). J802 CONNECTOR PIN B J801 OR J804 CONNECTOR