SHARP CDE800W Repair Manual

CD-E800W
Stopped
(1) Focus-HF system check.CH1=500 mVCH3=500 mV500 ms/div
DC 10:1DC 10:1(500 ms/div)
TNORM:20 kS/s
Although a CD is inserted and the cover is closed, "NO
DISC" is displayed.FDO
1
Press the OPEN/CLOSE switch (SW1) without inserting a
disc, and try starting the playback operation.
TDO
3
CH1
v/DIV
500 mV
=Filter==Offset==Record Length==Trigger=
Smoothing : ONCH1 : 0.000 VMain : 100 KMode : AUTO
BW : FULLCH2 : 0.0 VZoom : 2 KType : EDGE CH1
CH3 : 0.000 VDelay : 0.0 ns
CH4 : 0.00 VHold off : 0.2 ?s
Figure 40-1
No
1. Does the pickup move to the PICKUP-IN Switch (SW4)Sled motor (M2).
position ?
Yes
2. Does the focus (lens) move up and down ?No
Check the focus peripheral circuit.
(Waveform drawing Figure 40-1)
Yes
No
3. Is the laser lit ?Check the laser diode driver Q1 peripheral circuit.
Yes
No
4. Is the turntable rotating ?Spindle motor (M1).
When a disc is loaded, start playback operation.
No
1. Is focus servo activated ?Pins 7~11, 79 and 80 on IC1
(Waveform drawing Figure 40-2)Check the laser diode driver Q1 peripheral circuit.
Yes
No
No
2. Does DRF change from "L" to "H" ?Is the disc rotating ?Check the spin system.
YesIf the disc is spinning and a HF waveform is generated,
DRF will go H.
No
3. Is the HF waveform normal ?If the level is not normal.
(Waveform drawing Figure 40-3)
Stopped
CH1=500 mVCH2=10 VCH3=1 V500 ms/div
DC 10:1DC 10:1DC 10:1(500 ms/div)
NORM:20 kS/s
FDO
1
TDRF
2
TE
3
CH2
Position
CH Position To 0.20 div
-3 div-1 div0 div+1 div+3 div
=Filter==Offset==Record Length==Trigger=Vp-p=1.0 V~1.3 V
Smoothing : ONCH1 : 0.000 VMain : 100 KMode : AUTO0.5 mV/div,0.5 ?sec/div
BW : FULLCH2 : 0.0 VZoom : 2 KType : EDGE CH1
CH3 : 0.00 VDelay : 0.0 ns
CH4 : 0.00 VHold off : 0.2 ?s
Figure 40-3
Figure 40-2
� 40 �