Sharp CD-SW200 Service Manual page 77

(4) PLL system check.
When a disc is loaded, start play operation.
The HF waveform is normal, but the TOC data cannot be read.
Check the PDOUT waveform. (Figure 6)
Check around pins 26~30 on IC1.
(5) Others.
The HF waveform is normal and the time is displayed normally,
but no sound is produced. Or the sound has dropouts.
Is pin 69 (C2F) on IC1 "L" ?
1. When playing at normal speed.
Check the peripheral circuit at pin 39 (DOUT) on IC1 and the
waveform (Figure 7).
If OK, Check the unit.
Yes
Stopped
CH1=500 mV
DC 10:1
PDO1
3
4
PDO2
T
FDO
1
=Filter=
Smoothing : ON CH1 :
BW : FULL CH2 :
CH3 :
CH4 :
No There are too many error flags on a damaged disc which makes
error correction impossible.
Check again using a known good disc.
T
Stopped
CH1=2 V
DC 10:1
T
1
DOUT
=Filter= =Offset=
Smoothing : ON CH1 :
BW : FULL CH2 :
CH3 :
CH4 :
7 – 4
CD-SW200
1999/04/05 17:33:17
CH3=1 V CH4=1 V 500 ms/div
DC 10:1 DC 10:1 (500 ms/div)
NORM:20 kS/s
CH1
v/DIV
500 mV
=Offset= =Record Length= =Trigger=
0.000 V Main : 100 K Mode : AUTO
0.0 V Zoom : 2 K Type : EDGE CH2
0.00 V Delay : 0.0 ns
Hold off : 0.2 µs
0.00 V
Figure 6
1999/04/07 09:25:28
500 ns/div
(500 ns/div)
NORM:200 MS/s
=Record Length= =Trigger=
0.00 V Main : 1 K Mode : NORMAL
0.00 V Zoom : 100 Type : EDGE CH1
0.00 V Delay : 2.887 ms
0.00 V Hold off : 0.2 µs
Figure 7