Sharp XL-DV60 Service Manual page 52

XL-DV60
(1) Focus-HF system check.
Although a DVD/CD is inserted and the cover is closed,
"NO DISC" is displayed.
Press the OPEN/CLOSE switch (SW717) without inserting a
disc, and try starting the playback operation.
1. Does the pickup move to the PICKUP-IN Switch position?
2. Does the focus (lens) move up and down?
(Waveform drawing Figure 1)
3. Is the laser lit?
4. Is the turntable rotating?
When a disc is loaded, start playback operation.
1. Is focus servo activated?
(Waveform drawing Figure 2)
3. Is the HF waveform normal?
(Waveform drawing Figure 3)
Figure 2
Yes
Yes
Yes
Yes
No Sled motor.
No Check the focus peripheral circuit.
No Check the laser diode driver Q10,Q11 peripheral circuit.
No Spindle motor.
No Pins 39~41, 79 and 63 on U7.
Check the laser diode driver Q10,Q11 peripheral circuit.
No If the level is not normal.
7 – 2
Figure 1
Figure 3