Sharp CD-SW300H Service Manual download pdf (Page 82)

CD-SW300

7 – 3

Check the TE waveform at pin 16 on IC1.

(2) Focus-HF 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

DRF

Stopped

CH1=10 V

DC 10:1

CH2=1 V

DC 10:1

100 ms/div

(100 ms/div)

NORM:100 kS/s

=Record Length=

Smoothing : ON CH1 : 0.0 V

CH2 : 0.00 V

Main : 100 K

Zoom : 2 K

Mode : NORMAL

Type : EDGE CH1

Delay : 2.924 ms

Hold off : 0.2 µs

CH3 : 0.00 V

CH4 : 0.00 V

BW : FULL

=Trigger=

=Filter= =Offset=

(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 5 and 6 on CNP2.

Figure 5

PDOUT 0

PDOUT 1

Stopped

CH1=200 mV

DC 10:1

CH2=500 mV

DC 10:1

500 ms/div

1999/04/07 09:51:15

(500 ms/div)

NORM:20 kS/s

=Record Length=

Smoothing : ON CH1 : 0.000 V

CH2 : 0.000 V

Main : 100 K

Zoom : 2 K

Mode : NORMAL

Type : EDGE CH2

Delay : 2.924 ms

Hold off : 0.2 µs

CH3 : 0.00 V

CH4 : 0.00 V

BW : FULL

=Trigger=

=Filter= =Offset=

1 2 ... 77 78 79 80 81 82 83 84 85 86 87 ... 119 120

Comments to this Manuals

No comments

Sharp CD-SW300H Service Manual Page 82

Comments to this Manuals

Related products and manuals for Cassette players Sharp CD-SW300H