NAD C 272 Manuel D'installation page 7

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.
SWITCH
VACATION switch set to OFF
VACATION switch set to ON
Press front power switch with
VACATION switch set to ON
Press front power switch with
VACATION switch set to ON
12V TRIGGER
VACATION switch set to OFF
VACATION switch set to ON
12 V INPUT TRIGGER = 0V with
VACATION switch set to ON
12V INPUT TRIGGER = 12V with
VACATION switch set to ON
SLEEP/WAKE
VACATION switch set to OFF
VACATION switch set to ON
SLEEP/WAKE SENSE DEFEAT switch
set to SENSE DEFEAT with VACATION
switch set to ON
SLEEP/WAKE SENSE DEFEAT switch
set to SLEEP/WAKE and any source
input greater than 20mV with
VACATION switch set to ON
ATO LOGIC CHART
Amber LED over Green
front power switch SWITCH LED
OFF OFF
Amber OFF
Green ON
Amber OFF
Amber LED over Green
front power switch SWITCH LED
OFF OFF
Amber OFF
Amber OFF
Green OFF
Amber LED over Green
front power switch SWITCH LED
OFF OFF
Amber OFF
Amber OFF
Green OFF
Green Green
12V-TRIGGER LED SENSE LED
OFF OFF
OFF OFF
OFF OFF
OFF OFF
Green Green
12V-TRIGGER LED SENSE LED
OFF OFF
OFF OFF
OFF OFF
ON OFF
Green Green
12V-TRIGGER LED SENSE LED
OFF OFF
OFF OFF
OFF OFF
OFF ON
GB
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