Sharp CMS-R600X(BK) Service Manual page 40

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CMS-R600X/R600XT
• Playback can only be performed when a disc
is loaded.
Is the Focus servo active? (Can you hear it working?)
Yes
Does the DRF signal change from "L" to "H"?
Yes
Is HF waveform normal (see the Fig. 40-1,2)?
Yes
Check the tracking system.
HF
1.0V/DIV
0.5µsec/DIV(DC)
(When playing
back the disc)
Figure 40-1
• Check the tracking system.
Check waveform of IC1 pin 7 (TE).
Yes
The waveform shown in Fig.
40-3 appears, and no-disc
state appears soon.
Yes
Play is possible in
TEST mode.
Yes
Data cannot be read.
No
No
No
Yes
Tracking servo is
inoperative.
Yes
Although IL is possible,
play is impossible.
Yes
Check the VCO-PLL system.
5ms
1.00 V
IC1 7 TE
5 ms
5.0 V
IC1 54 DRF
Figure 40-3
– 40 –
Check the laser diode driver.
Check the area around IC1(16) - (21) (focus servo circuit).
If the disc is not turning, the
DRF should not change to "H".
Level is abnormal.
Waveform is unstable.
0.5s
1.00 V
IC1 16 FD
0.5s
10.0 V
IC2 12 CLV+
0.5s
10.0 V
IC1 54 DRF
0.5s
2.00 V
IC1 7 TE
Figure 40-2
Check the periphery of IC 1
Yes
pin 8 to pin 15, and IC 5 to
CNP3.
Yes
Normal jump is impeded,
and the program top
cannot be reached.
4
3
Yes
Check the spin system.
Yes
Check the periphery of
IC1 pins 41 and 42.
Yes
Check the spin system.
Waveform
in case
of normal
play-back
2
1
3
4
Yes
Check the periphery
of IC 1 pin 14.

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