Read Sharp DK-KP80PH (serv.man2) Service Manual online
DK-KP80PH
4 – 2
Although a CD is inserted and the cover is
closed, "NO DISC" is displayed.
closed, "NO DISC" is displayed.
(1) Focus-HF system check.
Press the Tray1 CD Eject Button without inserting a disc,
and try starting the playback operation.
and try starting the playback operation.
1. Does the pickup move to the PICKUP-IN Switch position?
No
No
Sled motor.
Yes
2. Does the focus (lens) move up and down?
(Waveform drawing Figure 1)
(Waveform drawing Figure 1)
No
Check the focus peripheral circuit.
Yes
Check the laser diode driver Q5 peripheral circuit.
3. Is the laser li ?
t
Yes
4. Is the turntable rotating?
No
Spindle motor.
When a disc is loaded, start playback operation.
1. Is focus servo activated?
(Waveform drawing Figure 2)
(Waveform drawing Figure 2)
No
Pins
114,115, 117,118 ( 122 ~129) on IC1
Check the laser diode driver Q5 peripheral circuit.
Yes
2. Is the HF waveform normal?
(Waveform drawing Figure 3)
(Waveform drawing Figure 3)
No
If the level is not normal.
Figure 2
118
117
IC1
IC1
1
2
FOP
TRP
Figure 1
118
78
IC1
IC1
1
4
FOP
TE
134
IC1
RFOUT
7
RFOUT
Figure 3
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