Sharp XL-HF201P Service Manual page 11

(1) Focus-RF 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)
position?
2. Does the focus (lens) move up and down?
(Waveform drawing Figure 1)
. 3 s I h t e a l s r e i l t?
4. Is the turntable rotating?
When a disc is loaded, start playback operation.
1. Is focus servo activated?
(Waveform drawing Figure 2)
2. Is the RF waveform normal?
(Waveform drawing Figure 3)
IC1
FDO
1
102
IC1
TE
4
63
Yes
Yes
Yes
Yes
Figure 2
1
FDO
IC1
102
TDO
IC1
2
101
No
Sled motor (NM2).
No Check the focus peripheral circuit.
N o
Check the laser diode driver Q5 peripheral circuit.
No Spindle motor (NM1).
No Pins 98, 99, 101,102,106 ~113 on IC1
Check the laser diode driver Q5 peripheral circuit.
No If the level is not normal.
RFOUT
IC1
118
7
4 – 2
XL-HF201P
Figure 1
Figure 3