HCD-VX99, MHC-VX99 — Sony Audio Service Manual (repair manual). Page 4

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4
SECTION 1
SERVICE NOTE
Screw hole
Attach the panel board with 
six screws (+BVTP 2.6 
× 8 ) 
after the board is removed once.
Do not tighten the screws excessively.
1
 Cut the eleven melted-connection points with a cutting plier.
Note for installing the panel board
2
 Panel board
Hot melt
SELF-DIAGNOSIS
This model has the self-diagnosis function for the VIDEO and AUDIO decoder sections.
Connecting to the LED between TP522 and TP523 on the VIDEO BOARD.
Immediately after the power on, the self-diagnosis function searches each operation of IC’s around the mechanism control microcomputer
(IC701). and TP5
The results can be checked by LED of the VIDEO board.
Oscilloscope (Waveform)
Symptom
No error
MPEG decoder (IC505)
error
MPEG decoder (IC505)
or
DRAM (IC507) error
[VIDEO BOARD] (SIDE A)
H
L
Light
2 time blinking
H
L
H
L
3 time blinking
TP523 TP522
LED
IC505
100
91
33
64
90
65
1
32
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