Sony HCD-SHAKE33, Service Manual

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HCD-SHAKE33/SHAKE77
22
Switching Regulator Diagnosis Flow (HCD-SHAKE33)
The Output from Switching regulator is checked.
Is following power voltage up to standard?
Standby
CN 3 pin1
CN 2 pin10
AC IN
Yes
No
Yes
END
No
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
CN 3 :pin6
13V±0.5V 13V±0.5V
0V 0V
pin7 0V 0V
pin5 0V 0V
pin4 0V 0V
pin1 0V 0V
13V±0.5V
61V±5%
24V±2.5V
-24V±2.5V
-61V±5%
16V~23V
(1) AC input
(2) Fuse
(3) Sub Power transformer
(4) CN 3 Connector
pin1-2: 13V
pin3-4: GND
pin5: AC-DET
pin6: MAIN-ON
(5) MAIN Power transformer
(6) CN 2 Connector
pin1: V3+ (DC+16V~23V) _ (ref-V1)
pin2-4: V1- (DC-61V)
pin5: V2- (DC-24V)
pin6: GND
pin7: V2+ (DC+24V)
pin8-10: V1+ (DC+61V)
Hi (3.3V)
Power On Demo mode
Low (0V)
Low (0V)
Standby
Power On Demo mode
(1) (2)
(3)
(6)
(5)
(4)
SECTION 5
TROUBLESHOOTING