Sharp XL-HP500 Service Manual - Page 38

has dropouts.

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XL-HP500 (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 38-1) Check around pins 73~78 on IC1. Stopped CH1=500 mV DC 10:1 PDO1 3 CH3=1 V DC 10:1 1999/04/05 17:33:17 CH4=1 V DC 10:1 500 ms/div (500 ms/div) NORM:20 kS/s 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 38-1 (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 52 (C2F) on IC1 "L" ? No Yes 1. When playing at normal speed. Check the peripheral circuit at pin 39 (DOUT) on IC1 and the waveform (Figure 38-2). If OK, Check the unit. There are too many error flags on a damaged disc which makes error correction impossible. Check again using a known good disc. Stopped T CH1=2 V DC 10:1 T 1999/04/07 09:25:28 500 ns/div (500 ns/div) NORM:200 MS/s 1 DOUT =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 38-2 - 38 -

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XL-HP500
– 38 –
T
T
DOUT
Stopped
CH1=2 V
DC
10:1
500 ns/div
1999/04/07
09:25:28
(500 ns/div)
NORM:200 MS/s
1
=Record Length=
Smoothing :
ON
CH1
:
0.00 V
CH2
:
0.00 V
Main
:
1 K
Zoom
:
100
Mode
:
NORMAL
Type
:
EDGE CH1
Delay
:
2.887 ms
Hold off
:
0.2
μ
s
CH3
:
0.00 V
CH4
:
0.00 V
BW
: FULL
=Trigger=
=Filter=
=Offset=
T
FDO
PDO2
PDO1
Stopped
CH1=500 mV
DC
10:1
CH3=1 V
DC
10:1
CH4=1 V
DC
10:1
500 ms/div
(500 ms/div)
NORM:20 kS/s
1
4
3
=Record Length=
Smoothing :
ON
CH1
:
0.000 V
CH2
:
0.0 V
Main
:
100 K
Zoom
:
2 K
Mode
:
AUTO
Type
:
EDGE CH2
Delay
:
0.0 ns
Hold off
:
0.2
μ
s
CH3
:
0.00 V
CH4
:
0.00 V
BW
: FULL
=Trigger=
=Filter=
=Offset=
CH1
v/DIV
500 mV
1999/04/05
17:33:17
Is pin 52 (C2F) on IC1 "L" ?
Yes
No
The HF waveform is normal and the time is displayed
normally, but no sound is produced. Or the sound
has dropouts.
(5) Others.
There are too many error flags on a damaged disc which
makes error correction impossible.
Check again using a known good disc.
1. When playing at normal speed.
Check the peripheral circuit at pin 39 (DOUT) on IC1 and
the waveform (Figure 38-2).
If OK, Check the unit.
When a disc is loaded, start play operation.
(4) PLL system check.
The HF waveform is normal, but the TOC data cannot be
read.
Check the PDO waveform. (Figure 38-1)
Check around pins 73~78 on IC1.
Figure 38-1
Figure 38-2