Sony HCD-GTR888 Service Manual ▷ View online
9
Following are descriptions of the Main section.
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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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11
<Unusual detection>
(4) When the variation of AC voltage is detected by AC_CUT
(4) When the variation of AC voltage is detected by AC_CUT
signal ,proceed to
shutdown operation and the backup data is recorded
to memory
into SYSTEM CONTROLLER.
The data such as the time, tuner setting, sound field, volume and
speaker settings are stored as backups.
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12
Following are descriptions of the Display section.
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