Sharp CD-ES600 Service Manual page 69

(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 (NSW1) 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
(500 ms/div)
DC 10:1
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 (NM2).
No Check the focus peripheral circuit.
No Check the laser diode driver Q1 peripheral circuit.
No Spindle motor (NM1).
No Pins 7~11, 13,19 and 20 on IC1
Check the laser diode driver Q1 peripheral circuit.
Is the disc rotating? No
No If the level is not normal.
7 – 2
CD-ES600/CD-ES66
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