Fact And Fe For Dvd9 (Dual Disc); System Clock Of Mpeg Ic - Zenith DVB318 Service Manual

22. FACT and FE for DVD9 (Dual disc)

FE signal becomes like the waveform 2, in case of DVD dual layer disc since the laser
beam is reflected on both layer 0 and layer 1.
A

23. System clock of MPEG IC

The waveform and the block diagram as below show a clock input and output between IC501 and X501.
Clocks generated in X501 is output and input into pin120 of IC501.
The clock frequency is 27MHz.
If this clock is abnormal or does not appear, replace the X-tal or MPEG IC
IC506
Buffer IC
R500
C541
A diagram for a colck input of IC501
L508
IC501
C542
Layer0 Layer1
IC501
pin120
3-12
MPEG CLOCK