TM 9-2350-287-10OPERATING AUXILIARY EQUIPMENT (continued)Operating the AN-1780/VRCThe AN-1780/VRC is the master control for the intercommunication system, AN/VIC-1(V).Nothing works until both driver’s MASTER switch and the AN-1780/VRC are turned on.CAUTIONBefore starting vehicle engine, make certain MAIN PWR switchis OFF. Otherwise, engine start could damage AN-1780/VRC.1. With vehicle power on, set MAlN PWR switch(1) to INT ONLY and set POWER CKT BKRswitch (6) to ON. POWER lamp (5) should light.2. Leave INT ACCENT switch (2) at OFF, RADIO TRANS switch (3) at LISTENINGSILENCE, and INSTALLATION SWITCH (4) at INT ONLY.2-191
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