Sony MHC-V41D Service Manual page 42

MHC-V41D
4 SMPS Board Mount Diagnosis Flow
Connect the power supply cord.
The voltage of the following is outputted.
NO6501: pin 9 (MAIN ON)
Yes
The voltage of the following is outputted.
NO6501:
pin 1 (A-supply),
pin 4, 5 (M-supply)
CN6500: pin 6 to 9 (V1)
Yes
End
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Standby Demo mode
Low (0 V) Hi (3.3 V)
Standby Demo mode
17.4 V ± 5 % 17.4 V ± 5 %
58.5 V ± 5 % 58.5 V ± 5 %
No Check whether the state of the power
supply cord and AC outlet are normal.
Power on
If there are no problems, check the
surrounding circuit for MAIN ON signal
Hi (3.3 V)
output on the MOTHER board.
No Check the following 2 points.
Power on
opened.
applied to the varistor (VR6000).
17.4 V ± 5 %
58.5 V ± 5 %
varistor (VR6000), and check the voltage
again.
Replace the SMPS board.
No
Yes