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CD-BP2000W/210W/2000A/BK2000W/210W
(1) Focus-HF system check
Although a CD is inserted and the cover is closed, "NO
DISC" is displayed.
Press the OPEN/CLOSE switch (SW1) without inserting a
disc, and try starting the playback operation.
1. Did the pickup move to the PICKUP-IN Switch (SW4)
position?
Yes
2. Does the focus (lens) move up and down?
(Waveform drawing 44-1).
Yes
3. Is the laser lit?
Yes
4. Is the turntable rotating?
When a disc is loaded, start playback operation.
1. Is focus servo activated? (Waveform drawing 44-2)
Yes
2. Does DRF change from "L" to "H"?
Yes
3. Is the HF waveform normal? (Waveform drawing 44-3)
Stopped
CH1=500mV
CH2=10V
CH3=1V
DC 10:1
DC 10:1
DC 10:1
FDO
1
T
DRF
2
TE
3
CH Position To
-3div
-1div
0div
+1div
=Filter=
=Offset=
=Record Length=
Smoothing : ON
CH1 :
0.000V
Main :
BW : FULL
CH2 :
0.0V
Zoom :
CH3 :
0.00V
CH4 :
0.00V
Figure 44-2
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No
No
No
No
No
No
Is the disc rotating?
No
500ms/div
(500ms/div)
NORM:20kS/s
CH2
Position
0.20div
+3div
=Trigger=
100K
Mode : AUTO
2K
Type : EDGE CH1
Delay :
0.0ns
Hold off :
0.2us
– 44 –
Stopped
CH1=500mV
CH3=500mV
DC 10:1
DC 10:1
T
FDO
1
TDO
3
=Filter=
=Offset=
=Record Length=
Smoothing : ON
CH1 :
0.000V
Main :
BW : FULL
CH2 :
0.0V
Zoom :
CH3 :
0.000V
CH4 :
0.00V
Figure 44-1
Sled motor (M2)
Check the focus peripheral circuit.
Check the laser diode driver Q3 peripheral circuit.
Spindle motor (M1).
Pins 1~11 on IC1
Check the laser diode driver Q3 peripheral circuit.
Focus error circuit (pins 20 and 21 on IC1)
No
Check the spin system.
If the disc is spinning and a HF waveform is generated,
DRF will go H.
If the level is not normal, check around pins 27~29 on IC1.
Figure 44-3
500ms/div
(500ms/div)
NORM:20kS/s
CH1
v/DIV
500mV
=Trigger=
100K
Mode : AUTO
2K
Type : EDGE CH1
Delay :
0.0ns
Hold off :
0.2us
Vp-p=1.0V~1.3V
0.5mV/div,0.5µsec/div
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