Toshiba SD-22VB Service Manual page 94

DVD/CD ANALOG AUDIO DOES
NOT APPEAR
Are there waveform
at pin 136, 139 and 141
of IC4001?
YES
Are there waveform
at pin 20, 23 of IC8503?
YES
Is the voltage at pin 3
of CP8502 about 5V?
YES
Check IC8503
and peripheral circuit.
TROUBLESHOOTING GUIDE
Are there waveform
NO
at line of DVD DATA 0-7?
Check IC2001
and peripheral circuit.
NO
NO
E-32
YES
NO
Change IC8503.
Check IC8004
and peripheral circuit.
Change IC4001.