Troubleshooting - Sony HCD-SHAKE33 Service Manual

Switching Regulator Diagnosis Flow (HCD-SHAKE33)
(5)
(6)
(3)
(4)
(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)
(2) (1)
The Power Control signal to Switching regulator is checked.
Is following power voltage OK?
Main on/Sub on
CN 3 :pin6
The Output from Switching regulator is checked.
Is following power voltage up to standard?
Standby
CN 3 pin1 13V±0.5V
CN 2 pin10
pin7
pin5
pin4
pin1
AC IN
No
Standby Demo mode Power On
Low (0V) Low (0V) Hi (3.3V)
Yes
Demo mode Power On
No
13V±0.5V 13V±0.5V
0V 0V 61V±5%
0V 0V 24V±2.5V
0V 0V -24V±2.5V
0V 0V -61V±5%
0V 0V 16V~23V
Yes
END
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.