Read Sharp XL-HF401PH (serv.man5) Service Manual online
XL-HF401PH
4 – 2
(1) Focus-HF system check.
Figure 2
Figure 3
102
101
IC1
IC1
1
FDO
TDO
Figure 1
Press the Tray1 CD Eject Button without inserting a disc, and try
starting the playback operation.
starting the playback operation.
2. Does the focus (lens) move up and down ?
(Waveform drawing Figure 1)
(Waveform drawing Figure 1)
1. Is focus servo activated ?
(Waveform drawing Figure 2)
(Waveform drawing Figure 2)
2. Is the RF waveform normal ?
(Waveform drawing Figure 3)
(Waveform drawing Figure 3)
1. Does the pickup move to the PICKUP-IN Switch (NSW1)
position ?
Sled motor (NM2).
Check the focus peripheral circuit.
Check the laser diode driver Q5 peripheral circuit.
Spindle motor (NM1).
If the level is not normal.
Pins 98, 99, 101, 102, 106 ~ 113 on IC1.
Check the laser diode driver Q4 peripheral circuit.
Check the laser diode driver Q4 peripheral circuit.
3. Is the laser lit ?
4. Is the turntable rotating ?
When a disc is loaded, start playback operation.
Although a CD is inserted and the cover is
closed, "NO DISC" is displayed.
closed, "NO DISC" is displayed.
Yes
Yes
Yes
Yes
No
No
No
No
No
No
2
102
63
IC1
IC1
1
4
118
IC1
7
FDO
TE
RFOUT
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