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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 Tray1 CD Eject Button without inserting a disc, and try
starting the playback operation.
1. Does the pickup move to the PICKUP-IN Switch (SW1A) posi-
tion ?
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
T
DRF
2
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
CH1 :
BW : FULL
CH2 :
CH3 :
CH4 :
No
Sled motor (M2A).
No
Check the focus peripheral circuit.
No
Check the laser diode driver Q1 peripheral circuit.
No
Spindle motor (M1A).
No
Pins 7~11, 79 and 80 on IC1
Check the laser diode driver Q1 peripheral circuit.
Is the disc rotating ?
No
No
If the level is not normal.
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=
0.000 V
Main :
100 K
Mode : AUTO
0.0 V
Zoom :
2 K
Type : EDGE CH1
0.000 V
Delay :
0.0 ns
0.00 V
Hold off :
0.2 µs
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-HP707
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