Sharp CD-M4000W Service Manual download pdf (Page 42)

CD-M4000W//CP-M4000

:.(I)

,Focus-HF

system.check.

‘,‘.

Although a CD is inserted and the cover is closed, “NO

DISC” is displayed.

Press the OPEN/CLOSE switch

(SWl)

without inserting a

disc, and try starting the playback operation.

Does the pickup move to the PICKUP-IN Switch (SW4)

oosition

I-

Sled motor

(MZ).

Figure

42-1

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

(Waveform drawing Figure 42-l)

t-4

Check the focus peripheral circuit.

3. Is the laser lit

)

Check the laser diode driver

peripheral circuit.

4. Is the turntable rotating

When a disc is loaded, start playback operation.

)

Spindle motor (Ml).

1. Is focus servo activated

(Waveform drawing Figure 42-2)

)

Pins 7-12, 79 and 80 on

ICl

Check the laser diode driver

peripheral circuit.

Yes

)

Is the disc rotating

---)

Check the spin system.

If the disc is spinning and a HF waveform is generated,

DRF will go H.

3. Is the HF waveform normal

(Waveform drawing

the level is not normal.

Figure 42-3)

Figure 42-2

Figure 42-3

-42-

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Sharp CD-M4000W Service Manual Page 42

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