CD-MPS440W
7 – 2
Although a CD is inserted and the cover is closed, "NO
DISC" is displayed.
(1) Focus-HF system check.
Press the OPEN/CLOSE switch (SW703) without inserting a
disc, and try starting the playback operation.
Figure 1
T
FDO
TDO
Stopped
CH1=500 mV
DC 10:1
CH3=500 mV
DC 10:1
500 ms/div
(500 ms/div)
NORM:20 kS/s
1
3
=Record Length=
Smoothing : ON
CH1 :
0.000 V
CH2 :
0.0 V
Main :
100 K
Zoom :
2 K
Mode : AUTO
Type : EDGE CH1
Delay :
0.0 ns
Hold off :
0.2 µs
CH3 :
0.000 V
CH4 :
0.00 V
BW : FULL
=Trigger=
=Filter=
=Offset=
CH1
v/DIV
500 mV
1. Does the pickup move to the PICKUP-IN Switch(SW1) posi-
tion?
No
Sled motor(NM801).
Yes
2. Does the focus (lens) move up and down?
(Waveform drawing Figure 1)
No
Check the focus peripheral circuit.
Yes
3. Is the laser lit?
No
Check the laser diode driver Q409 peripheral circuit.
Yes
4. Is the turntable rotating?
No
Spindle motor(NM802).
When a disc is loaded, start playback operation.
1. Is focus servo activated?
(Waveform drawing Figure 2)
No
Pins 5~9,11, 14 and 18,19 on IC401.
Check the laser diode driver Q409 peripheral circuit.
Yes
2. Does DRF change from "L" to "H"?
No
Is the disc rotating?
No
Check the spin system.
Yes
If the disc is spinning and a HF waveform
is generated, DRF will go H.
3. Is the HF waveform normal?
(Waveform drawing Figure 3)
No
If the level is not normal.
Figure 2
FDO
TE
Stopped
CH1=500 mV
DC 10:1
CH2=10 V
DC 10:1
CH3=1 V
DC 10:1
500 ms/div
(500 ms/div)
NORM:20 kS/s
1
3
=Record Length=
Smoothing : ON
CH1 :
0.000 V
CH2 :
0.0 V
Main :
100 K
Zoom :
2 K
Mode : AUTO
Type : EDGE CH1
Delay :
0.0 ns
Hold off :
0.2 µs
CH3 :
0.00 V
CH4 :
0.00 V
BW : FULL
=Trigger=
=Filter=
=Offset=
-3 div
-1 div
0 div
+1 div
+3 div
CH Position To
CH2
Position
0.20 div
Figure 3
Vp-p=1.0 V~1.3 V
0.5 mV/div,0.5 µsec/div
RF
Содержание CD-MPS440W
Страница 22: ...CD MPS440W 5 3 MEMO ...
