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Nad C 272 User Manual Page 7

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7
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.
Amber LED over
front power switch
Green
SWITCH LED
Green
12V-TRIGGER LED
Green
SENSE LED
Amber LED over
front power switch
Green
SWITCH LED
Green
12V-TRIGGER LED
Green
SENSE LED
OFF OFF OFF OFF
VACATION switch set to OFF
SWITCH
12V TRIGGER
Amber LED over
front power switch
Green
SWITCH LED
Green
12V-TRIGGER LED
Green
SENSE LED
SLEEP/WAKE
Amber OFF OFF OFF
VACATION switch set to ON
Green ON OFF OFF
Press front power switch with
VACATION switch set to ON
Amber OFF OFF OFF
Press front power switch with
VACATION switch set to ON
OFF OFF OFF OFF
VACATION switch set to OFF
Amber OFF OFF OFF
VACATION switch set to ON
Amber OFF OFF OFF
12 V INPUT TRIGGER = 0V with
VACATION switch set to ON
Green OFF ON OFF
12V INPUT TRIGGER = 12V with
VACATION switch set to ON
OFF OFF OFF OFF
VACATION switch set to OFF
Amber OFF OFF OFF
VACATION switch set to ON
Amber OFF OFF OFF
SLEEP/WAKE SENSE DEFEAT switch
set to SENSE DEFEAT with VACATION
switch set to ON
Green OFF OFF 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
ATO LOGIC CHART
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