TM 9-2350-267-10OPERATING COMMUNICATION EQUIPMENT - ContinuedOperating AM-1780/VRCThe AM-1780/VRC is the master control for your intercom system. Nothing worksuntil both driver’s MASTER switch and AM-1780/VRC are turned on.CAUTIONBefore starting vehicle engine, make certain MAIN PWRswitch (1) is off. Otherwise, engine start could damageAM-1780/VRC.1.2.With vehicle power on, set MAIN PWR switch (1) to INT ONLY and POWERCKT BKR switch (2) to ON. POWER lamp (3) should light.Leave INT ACCENT switch (4) at OFF, RADIO TRANS switch (5) at LISTEN-ING SILENCE, and INSTALLATION SWITCH (6) at INT ONLY.2-195
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