Panasonic SA-AK88 Service Manual page 18

Troubleshooting
Video CD blue back
Procedure2-2
Troubleshooting flowchart
Press the SELECT(
Press the STOP(
Does blue-back screen appear?
Is the following waveform present at pin
T=63.5 s
Troubleshooting
Video portion of video CD No picture
Procedure2-3
Troubleshooting
Audio portion of video CD
Procedure2-4
Troubleshooting flowchart
Audio signal line
Is the following waveform present at pin
No blue back
Load a video CD disc.
) button to start playback.
)button to stop playback.
NO
of CN1000?
2
T=16.7 s
NO
T=0.5 s
YES
YES
Normal
0.5V
YES
0.5V
No sound
of IC1000?
110
NO
6.2V
Likely location of fault
Faults is in the main board
(video output block)
IC1000
Likely location of fault: IC1000
Likely location of fault
IC1000
IC702