![background image](http://html.mh-extra.com/html/sony/mhc-v3/mhc-v3_service-manual_1330104033.webp)
MHC-V3/V4D
33
Switching Regulator Diagnosis Flow (MHC-V3/V4D)
The Output from Switching regulator is checked.
Is following power voltage up to standard?
Standby
CN2005 pin1-4
CN4 pin1-9
AC
IN
Ye
s
No
Ye
s
END
No
Checks whether the state of a Cable and Outlet are normal.
If there are no problems, checks circumference circuit for
Main 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
CN2005: pin5
13.5V
±
0.5V
13.5V
±
0.5V
0V
0V
13.5V
±
0.5V
50V
±
5%
(1) AC
input
(2) Fuse
(3) Sub Power transformer
(4) CN2005 Connector
pin1-2: V2 (13.5V)
pin3-4: V2_GND
pin5: AC-DET
pin6: MAIN-ON
(5) MAIN Power transformer
(6) CN4 Connector
pin1-5: V1 (50V)
pin6-9: V1_GND
Hi (3.3V)
Power On
Demo mode
Low (0V)
Low (0V)
Standby
Power On
Demo mode
(1
)
(2
)
(3
)
(6
)
(4
)
(5
)
SECTION 5
TROUBLESHOOTING
Ver. 1.1