Sharp XL-HF201P Service Manual page 13

(4) PLL system check.
When a disc is loaded, start play operation.
The RF waveform is normal, but the TOC data cannot be read.
Check the PLL waveform. (Figure 6)
Check around pins 125~ 128 on IC1.
IC1
5
126
127
6
IC1
102
1
IC1
4 – 4
PLLF
PLLFO
FDO
Figure 6
XL-HF201P