Read Sony HCD-GPX5G Service Manual online
HCD-GPX5G/GPX7G/GPX8G
2
SECTION 1
SERVICING NOTES
TROUBLESHOOTING
Switching Regulator Diagnosis Flow
The Output from Switching regulator is checked.
Is following power voltage up to standard?
Standby
Demo mode Power On
CN 3 1pin:
CN 2 1pin:
0V 0V
AC
IN
Ye
s
No
Ye
s
END
No
( 1
)
(2
)
(
3)
(4
)
( 5
)
(
6
)
(1) AC
input
(2) Fuse
(3) Sub Power transformer
(4) CN 3 Connector
pin1:13.5V , pin2:GND , pin3:
AC DET
, pin4: MAIN ON
pin5: SUB ON
(5) MAIN Power transformer
(6) CN 2 Connector
pin1-3: PVDD (DC+54.5V)
pin4: PVDD (DC+22V)
pin5: GND
pin6: PVDD (DC-22V)
pin7-9: PVDD (DC-54.5V)
Checks whether the state of a Cable and Outlet are normal.
If there are no problems, checks circumference circuit for
Main on/Sub on Output of Main mount side.
Replaces Switching regulator if it is not up to standard.
The Power Control signal to Switching regulator is checked.
Is following power voltage OK?
Main on/Sub on Standby
Demo mode Power On
CN 3 :4pin: Low (0V) Low (0V)
Hi (3V)
CN 3 :5pin
Low (0V) Hi (3V) Hi (3V)
7.5V±0.5V
13.5V ±0.5V
13.5V ±0.5V
54.5V ±0.5V
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