Read Sony HCD-V5500 / MHC-V5500 / MHC-V7700AV Service Manual online
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SECTION 1
SERVICING NOTE
SELF-DIAGNOSIS
This model has the self-diagnosis function for the VIDEO and
AUDIO decoder sections.
Immediately after the power on, the self-diagnosis function searches
each operation of IC’s around the mechanism control microcomputer
(IC701).
The results can be checked by connecting an oscilloscope to TP709
(LED) of the VIDEO board.
AUDIO decoder sections.
Immediately after the power on, the self-diagnosis function searches
each operation of IC’s around the mechanism control microcomputer
(IC701).
The results can be checked by connecting an oscilloscope to TP709
(LED) of the VIDEO board.
Note:
The LED for check (D701) is mounted to some sets
(FORMER TYPE). In this case, confirm the lighting
condition of LED.
condition of LED.
[VIDEO BOARD] (SIDE A)
[VIDEO BOARD] (SIDE B)
Oscilloscope (Waveform)
Symptom
No error
External SRAM (IC751)
error
error
MPEG decoder (IC201)
error
error
DRAM (IC251)
error
error
H
L
Light
H
L
1 time blinking
H
L
2 time blinking
H
L
3 time blinking
VIDEO board
TP709 (LED)
TP709 (LED)
Oscilloscope
+
_
D701
IC771
TP709 (LED)
X901
IC751
IC251
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