Panasonic SA-AK88 Service Manual page 17

Troubleshooting
Video CD
Procedure2-1
Troubleshooting flowchart
Press the SELECT(
Connected to TV
Does the menu appear on screen?
YES
Press the menu(+,-) to select the menu. Press
the select (
Image noise or unstable picture.
Check the waveforms at pin
pin of CN1000.
6
(Check)
Constant low(0V)
level 0V
Are the following waveforms present at pins
CDDATA
10
CDSCK
24
Video line
Procedure 2-3
No picture or No sound
Load a video CD disc.
) button to start playback.
Not connected to TV
NO
Press the STOP(
to stop playback.
TOC display normaly? (Are track
No. and time displays normal?)
) to start playback.
YES
of IC702 or
64
The following waveform is observed either
intermittently constantly during playback.
23 s
,
10
T=0.36 s
T=0.36 s
YES
Audio line
)button
YES
NO
Normal
YES
Is the sound unstable?
(Check)
23 s
3.2V
of CN1001?
24
3.2V
NO
3.0V
Procedure 2-4
Likely location of fault
Traverse deck. IC701, IC702
NO
NO
Faults is in the traverse deck
or main board (servo block).
IC1000