File name 868TROUBLE.pdf
Turn power on.
NO Check power supply circuit.
Is power on? (Check PN 807)
Does initial read work? Check laser circuit.
Check focus circuit.
Does it play? Check tracking servo circuit.
Does it output audio? Check audio circuit.
- 10 -
Fails to initial read
Disc motor turns. NO Does laser light? A
Does RF Does tracking Does signal Does TE2 signal
NO NO NO NO
waveform servo work? appear at appear at pin 53 Defective IC
appear? Lower envelope TP801(TEO)? of IC801? 801, pick up
TP 801(RF) of TP801(RF) and/or open
waveform is flat. wire.
YES Detective pattern.
Does signal appear at IC 803
Pin 26 and Pin 27 ? NO Defective IC 801
and/or IC 803
YES Defective pick-up
Is rotation normal? NO Does GFS (IC802 pin 25) NO
show as below? Defective IC 801.
Is there no dropout of RF Scratch in disc
signal? initial read area.