OPERATING COMMUNICATION EQUIPMENT - Continued
The AM-1780/VRC is the master control for your intercom system. Nothing works
until both drivers MASTER switch and AM-1780/VRC are turned on.
Before starting vehicle engine, make certain MAIN PWR
switch (1) is off. Otherwise, engine start could damage
With vehicle power on, set MAIN PWR switch (1) to INT ONLY and POWER
CKT 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.