Sharp CD-M4000W Service Manual download pdf (Page 43)

CD-M4000W/CP-M4000

the waveform shown in Figure

43-1

appears and soon after

NO DISC appears

Yes

The tracking servo is not activated.

Check the peripheral circuits at pins 14, 15 and 20 on

IC1,

and

CNSl

A/B.

“Initialization” is possible, but play is not possible

Yes

A normal jump operation cannot be completed or the beginning of

the track cannot be found.

Check the around pin 20 on

ICl.

“Initialization” is not possible.

Data cannot be read. Check the VCO-PLL system.

Figure

43-1

Press the OPEN/CLOSE switch without inserting a disc, and

then try starting the play operation.

1. The turntable rotates a little

(Waveform drawing -- The spin driver circuit is OK.

Figure 43-2)

Yes

2. The turntable doesn’t rotate.

Check around pin 22 on ICI, pins 15 and 16 on

IC3,

and

CNSBAIB.

Figure 43-2

1 2 ... 38 39 40 41 42 43 44 45 46 47 48 ... 53 54

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Sharp CD-M4000W Service Manual Page 43