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(1) Focus-HF system check.
Although a CD is inserted and the cover is closed, "NO
DISC" is displayed.
Press the DISC EJECT switch (SW708) without inserting a disc,
and try starting the playback operation.
1. Does the pickup move to the PICKUP-IN Switch position?
2. Does the focus (lens) move up and down?
(Waveform drawing Figure 1)
3. Is the laser lit?
4. Is the turntable rotating?
When a disc is loaded, start playback operation.
1. Is focus servo activated?
(Waveform drawing Figure 2)
2. Does DRF change from "L" to "H"?
3. Is the HF waveform normal?
(Waveform drawing Figure 3)
Stopped
CH1=500 mV
CH2=10 V
DC 10:1
DC 10:1
FDO
1
TE
3
CH Position To
-3 div
-1 div
0 div
=Filter=
=Offset=
Smoothing : ON
CH1 :
0.000 V
BW : FULL
CH2 :
0.0 V
CH3 :
0.00 V
CH4 :
0.00 V
Figure 2
Yes
Yes
Yes
Yes
No
Yes
CH3=1 V
500 ms/div
DC 10:1
(500 ms/div)
NORM:20 kS/s
CH2
Position
0.20 div
+1 div
+3 div
=Record Length=
=Trigger=
Main :
100 K
Mode : AUTO
Zoom :
2 K
Type : EDGE CH1
Delay :
0.0 ns
Hold off :
0.2 µs
Stopped
CH1=500 mV
DC 10:1
T
FDO
1
TDO
3
=Filter=
Smoothing : ON
BW : FULL
No
Sled motor.
No
Check the focus peripheral circuit.
No
Check the laser diode driver Q801 peripheral circuit.
No
Spindle motor.
No
Pins 5~9,11, 14 and 18,19 on IC801.
Check the laser diode driver Q801 peripheral circuit.
Is the disc rotating?
No
No
If the level is not normal.
RF
7 – 2
CH3=500 mV
500 ms/div
DC 10:1
(500 ms/div)
NORM:20 kS/s
CH1
v/DIV
500 mV
=Offset=
=Record Length=
=Trigger=
CH1 :
0.000 V
Main :
100 K
Mode : AUTO
CH2 :
0.0 V
Zoom :
2 K
Type : EDGE CH1
CH3 :
0.000 V
Delay :
0.0 ns
Hold off :
0.2 µs
CH4 :
0.00 V
Figure 1
Check the spin system.
If the disc is spinning and a HF waveform
is generated, DRF will go H.
Vp-p=1.0 V~1.3 V
0.5 mV/div,0.5 µsec/div
Figure 3
XL-MP9H
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