Sharp CD-ES9 Service Manual - Page 79

The HF waveform is normal and the time is displayed nor, mally, but no sound is produced. Or

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Page 79 highlights

CD-ES900/CD-ES99 (4) PLL system check. When a disc is loaded, start play operation. Stopped CH1=500 mV DC 10:1 PDO1 3 CH3=1 V DC 10:1 1999/04/05 17:33:17 CH4=1 V 500 ms/div DC 10:1 (500 ms/div) NORM:20 kS/s The HF waveform is normal, but the TOC data cannot be read. Check the PDO waveform. (Figure 6) Check around pins 76~80 on IC1. 4 PDO2 T FDO 1 =Filter= Smoothing : ON BW : FULL =Offset= CH1 : 0.000 V CH2 : 0.0 V CH3 : 0.00 V CH4 : 0.00 V CH1 v/DIV 500 mV =Record Length= Main : 100 K Zoom : 2 K =Trigger= Mode : AUTO Type : EDGE CH2 Delay : 0.0 ns Hold off : 0.2 µs Figure 6 (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" ? No There are too many error flags on a damaged disc which makes error correction impossible. Yes 1. When playing at normal speed. Check the peripheral circuit at pin 39 (DOUT) on IC1 and the waveform (Figure 7). Check again using a known good disc. If OK, Check the unit. Stopped T CH1=2 V DC 10:1 T 1 DOUT 1999/04/07 09:25:28 500 ns/div (500 ns/div) NORM:200 MS/s =Filter= Smoothing : ON BW : FULL =Offset= CH1 : 0.00 V CH2 : 0.00 V CH3 : 0.00 V CH4 : 0.00 V =Record Length= Main : 1 K Zoom : 100 =Trigger= Mode : NORMAL Type : EDGE CH1 Delay : 2.887 ms Hold off : 0.2 µs Figure 7 7 - 4

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CD-ES900/CD-ES99
7 – 4
The HF waveform is normal and the time is displayed nor-
mally, but no sound is produced. Or the sound has drop-
outs.
(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 PDO waveform. (Figure 6)
Check around pins 76~80 on IC1.
Figure 6
T
FDO
PDO2
PDO1
Stopped
CH1=500mV
DC 10:1
CH3=1V
DC 10:1
CH4=1V
DC 10:1
500ms/div
(500ms/div)
NORM:20kS/s
1
4
3
=RecordLength=
Smoothing: ON CH1 : 0.000V
CH2 :
0.0V
Main : 100K
Zoom :
2K
Mode : AUTO
Type : EDGECH2
Delay :
0.0ns
Hold off :
0.2μs
CH3 :
0.00V
CH4 :
0.00V
BW :FULL
=Trigger=
=Filter=
=Offset=
CH1
v/DIV
500mV
1999/04/05 17:33:17
(5) Others.
Is pin 69 (C2F) on IC1 “L” ?
No
There are too many error flags on a damaged disc which makes
error correction impossible.
Yes
1. When playing at normal speed.
Check the peripheral circuit at pin 39 (DOUT) on IC1 and the
waveform (Figure 7).
Check again using a known good disc.
If OK, Check the unit.
Figure 7
T
T
DOUT
Stopped
CH1=2V
DC 10:1
500ns/div
1999/04/07 09:25:28
(500ns/div)
NORM:200MS/s
1
=RecordLength=
Smoothing: ON CH1 :
0.00V
CH2 :
0.00V
Main :
1K
Zoom : 100
Mode : NORMAL
Type : EDGECH1
Delay :
2.887ms
Hold off :
0.2μs
CH3 :
0.00V
CH4 :
0.00V
BW :FULL
=Trigger=
=Filter=
=Offset=