Sharp XL-DV60 Service Manual download pdf (Page 52)

XL-DV60

7 – 2

Although a DVD/CD is inserted and the cover is closed,

"NO DISC" is displayed.

(1) Focus-HF system check.

Press the OPEN/CLOSE switch (SW717) without inserting a

disc, and try starting the playback operation.

Figure 1

Stop

1. Does the pickup move to the PICKUP-IN Switch position? No Sled motor.

Yes

2. Does the focus (lens) move up and down?

(Waveform drawing Figure 1)

No Check the focus peripheral circuit.

Yes

3. Is the laser lit? No Check the laser diode driver Q10,Q11 peripheral circuit.

Yes

4. Is the turntable rotating? No Spindle motor.

When a disc is loaded, start playback operation.

1. Is focus servo activated?

(Waveform drawing Figure 2)

No Pins 39~41, 79 and 63 on U7.

Check the laser diode driver Q10,Q11 peripheral circuit.

Yes

3. Is the HF waveform normal?

(Waveform drawing Figure 3)

No If the level is not normal.

Figure 2

Stop

Figure 3

Stop

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Sharp XL-DV60 Service Manual Page 52