Sharp CD-M4000 - References; Troubleshooting Chart

CD-M4000W//CP-M4000
:.(I) ,Focus-HF system.check.
‘,‘. :
Although a CD is inserted and the cover is closed, “NO
DISC” is displayed.
r-
Press the OPEN/CLOSE switch (SWl) without inserting a
disc, and try starting the playback operation.
c
1. Does the pickup move to the PICKUP-IN Switch (SW4)
oosition ?
I-
No Sled motor (MZ).
Figure 42-1
2. Does the focus (lens) move up and down ?
(Waveform drawing Figure 42-l)
No
t-4
Check the focus peripheral circuit.
I I
No
3. Is the laser lit ?
) Check the laser diode driver Cl peripheral circuit.
4. Is the turntable rotating ?
When a disc is loaded, start playback operation.
No
) Spindle motor (Ml).
1. Is focus servo activated ?
(Waveform drawing Figure 42-2)
No
)
Pins 7-12, 79 and 80 on ICl
Check the laser diode driver Cl peripheral circuit.
I Yes
No
) Is the disc rotating ?
No
---) Check the spin system.
I
I
I
I
,
If the disc is spinning and a HF waveform is generated,
DRF will go H.
3. Is the HF waveform normal ? (Waveform drawing
If the level is not normal.
Figure 42-3)
Figure 42-2
Figure 42-3
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