Panasonic SA-AK88 Service Manual page 15

MASTER CLOCK SYSTEM WAVEFORM
a Video read clock
T=0.037 s
2.4V
F=27MHz
Diagnostic Procedures by Symptom
Symptom
CD-DA
TOC NG
Turntable fails to rotate.
Turntable rotates.
Audio normal
Audio normal
TOC OK, counter OK, but no
sound
b Write reference clock
T=0.354 s
3.0V
F=2.822MHz
Video-CD
TOC NG (both audio and video
are NG.) Blue black display.
Fails to rotate.
Rotates.
Audio normal, Video NG.
No sound, Video NG.
TOC OK, counter OK, but no
sound and video NG.
AUDIO DATA CLOCK SYSTEM WAVEFORM
A Audio bit clock
T=0.5 s
F=2MHz
Likely Location Fault
For TOC NG, fault in the CD servo circuit.
IC701, IC702, IC703, or traverse system.
Traverse system, focus servo system (IC701,IC703), supply
line, clock line system control.
Traverse system, tracking servo system/ CLV servo system/
traverse servo system (IC701, IC702, IC703)
IC1000
IC1000
CD disc other than DV "Karaoke" soft, video CD and CD-DA.
6.2V