Sharp CD-BA3000 Manuel de service télécharger pdf (Page 39)

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CD-BA3000

FDO

SPDO

Stopped

CH1=200mV

DC 10:1

CH2=500mV

DC 10:1

500ms/div

1999/04/07 09:51:15

(500ms/div)

NORM:20kS/s

=Record Length=

Smoothing : ON CH1 : 0.000V

CH2 : 0.000V

Main : 100K

Zoom : 2K

Mode : NORMAL

Type : EDGE CH2

Delay : 2.924ms

Hold off : 0.2us

CH3 : 0.00V

CH4 : 0.00V

BW : FULL

=Trigger=

=Filter= =Offset=

DRF

Stopped

CH1=10V

DC 10:1

CH2=1V

DC 10:1

100ms/div

(100ms/div)

NORM:100kS/s

=Record Length=

Smoothing : ON CH1 : 0.0V

CH2 : 0.00V

Main : 100K

Zoom : 2K

Mode : NORMAL

Type : EDGE CH1

Delay : 2.924ms

Hold off : 0.2us

CH3 : 0.00V

CH4 : 0.00V

BW : FULL

=Trigger=

=Filter= =Offset=

The tracking servo is not activated.

Check the peripheral circuits at pins 18 and 19 on IC1, pin 23 on

IC2, and CNS1A/B.

If the waveform shown in Figure 39-1 appears and soon after

NO DISC appears.

(2) Tracking system check

Check the TE waveform at pin 18 on IC1.

A normal jump operation cannot be completed or the beginning of

the track cannot be found.

Check the around pin 23 on IC2.

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

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

"Initialization" is not possible.

Figure 39-1

Figure 39-2

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

then try starting the play operation.

(3) Spin system check

The spin driver circuit is OK.

1. The turntable rotates a little. (Waveform drawing

Figure 39-2)

Check around pin 25 on IC2, pins 15 and 16 on IC3, and CNS3A/B.

2. The turntable doesn't rotate.

Yes

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Sharp CD-BA3000 Manuel de service Page 39

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