OPERATING AUXILIARY EQUIPMENT (continued)
Operating the AN-1780/VRC
The AN-1780/VRC is the master control for the intercommunication system, AN/VIC-1(V).
Nothing works until both drivers MASTER switch and the AN-1780/VRC are turned on.
Before starting vehicle engine, make certain MAIN PWR switch
is 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 BKR
switch (6) to ON. POWER lamp (5) should light.
2. Leave INT ACCENT switch (2) at OFF, RADIO TRANS switch (3) at LISTENING
SILENCE, and INSTALLATION SWITCH (4) at INT ONLY.