Sharp CD-DK890N Manual de Serviço descarregar pdf (Página 60)

CD-DK890N

7 – 3

Check the TE waveform at pin 16 on IC1.

(2) Focus-RF system check.

If the waveform shown in Figure 4 appears and soon after NO

DISC appears ?

Yes

The tracking servo is not activated.

Check the peripheral circuits at pins 15, 16 and 23 on IC1,

and FFC1.

"Initialization" is possible, but play is not possible ?

Yes

A normal jump operation cannot be completed or the begin-

ning of the track cannot be found.

Check the around pin 23 on IC1.

"Initialization" is not possible. Data cannot be read. Check the VCO-PLL (Pin26~30 on IC1)

system.

Figure 4

IC1

RFOUT

(3) Spin system check.

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

then try starting the play operation.

1. The turntable rotates a little ?

(Waveform drawing Figure 5)

Yes The spin driver circuit is OK.

2. The turntable doesn't rotate. Check around pin 25 on IC1, pins 1 and 2 on CNP2.

Figure 5

IC1

FDO

SPDO

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Sharp CD-DK890N Manual de Serviço Página 60