Read Sony HCD-GTR888 Service Manual online
10
<Boot up the SYSTEM >
(1) When the SYSTEM CONTROLLER(IC500) boots up ,outputs the
(1) When the SYSTEM CONTROLLER(IC500) boots up ,outputs the
PCONT SUB (SUB ON) and changes from Standby-mode to
Demo-mode.
When the Wakeup key input is detected from remote commander
or the main unit, outputs the PCONT MAIN (MAIN ON) and
changes to the Power mode.
Then
, the
variation of
AC
voltage monitors by AC-CUT signal and
controls the power.(Refer to 3-1-2(4))
<Unusual
detection
>
(2) The THERMA DETECT COMPARATOR
（
IC4900）
monitors the
temperature signal from thermistor. If the temperature reaches
more than fixed, the signal of shutdown outputs to SYSTEM
CONTROLLER and performs the shutdown operation.
(3) Also if the DC value of Speaker output is detected more than fixed ,
the signal is sent to DC DETECT SWITCH and outputs to
SYSTEM CONTROLLER and then performs the shutdown
operation.
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