Sony MHC-V4D Service Manual

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
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 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 OnDemo mode
Low (0V)Low (0V)
Standby
Power OnDemo mode
(1)
(2)
(3)
(6)
(4)
(5)
SECTION 5
TROUBLESHOOTING
Ver. 1.1

Sony MHC-V4D Specifications

General

Type	Home audio mini system
Cassette deck	No
Product color	Black
Optical disc player	Yes
Number of optical discs	1 discs
Bass reflex	-
Speaker type	3-way
RMS rated power	720 W
Woofer diameter	200 mm
Tweeter diameter	40 mm
Number of speakers	5
Mid-range driver diameter	100 mm
Equalizer modes	Custom, Pop, Flat, Rap, Rock
FM band range	87.5 - 108 MHz
Supported radio bands	FM
Power source	AC
Input voltage	120-240 V
Input frequency	50 - 60 Hz
Composite video out	1
Apple docking compatibility	Not supported
On Screen Display (OSD) languages	English
Playback modes	Program, Shuffle, Repeat, Normal
Audio formats supported	WMA, MP3
Display type	LCD

Weight and Dimensions

Depth	295 mm
Width	280 mm
Height	780 mm