ATO LOGIC
The C 272 amplifier may be turned on in any one of three discrete ways
for complete system flexibility: From the front-panel switch, the 12V-
TRIGGER circuit, or by a ?SLEEP/WAKE? signal-sensing circuit. The
ON/OFF power control is managed by the Automated Turn-On logic or
ATO Logic circuit that requires the amplifier to be switched back to
standby in the same manner by which it was activated. In other words,
if the amplifier is switched on via a 12V-control signal, it cannot be
switched to standby via the front-panel switch, it must wait for removal
of the 12V-control signal. In practice, you probably would use only one
of the methods once the NAD C 272 amplifier is installed.
ATO LOGIC CHART
Amber LED overGreenGreenGreen
SWITCH
front power switchSWITCH LED12V-TRIGGER LEDSENSE LED
VACATION switch set to OFFOFFOFFOFFOFF
VACATION switch set to ONAmberOFFOFFOFF
Press front power switch withGreenONOFFOFF
VACATION switch set to ON
Press front power switch with
AmberOFFOFFOFF
VACATION switch set to ON
Amber LED overGreenGreenGreen
12V TRIGGER
front power switchSWITCH LED12V-TRIGGER LEDSENSE LED
VACATION switch set to OFFOFFOFFOFFOFF
VACATION switch set to ONAmberOFFOFFOFF
12 V INPUT TRIGGER = 0V with
AmberOFFOFFOFF
VACATION switch set to ON
12V INPUT TRIGGER = 12V with
GreenOFFONOFF
VACATION switch set to ON
Amber LED overGreenGreenGreen
SLEEP/WAKE
front power switchSWITCH LED12V-TRIGGER LEDSENSE LED
VACATION switch set to OFFOFFOFFOFFOFF
VACATION switch set to ONAmberOFFOFFOFFGB
SLEEP/WAKE SENSE DEFEAT switch
set to SENSE DEFEAT with VACATIONAmberOFFOFFOFF
switch set to ON
SLEEP/WAKE SENSE DEFEAT switch
set to SLEEP/WAKE and any source
GreenOFFOFFON
input greater than 20mV with
VACATION switch set to ON
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