Service manual

CD-C471 W
0, Playback can only be performed when,a disc is
loaded. ‘. .-
. .
Is the Focus servo active? (Can you hear it working?)
Yes
1 No
Check the laser diode driver.
Check the area around ICl(16) b (21) (focus servo circuit).
No
If the disc is not turning, the DRF
should not change to “H”.
Check the spin system.
Yes
Yes
Is HF waveform normal (see the Fig. 42-1, 2)?
Yes
Check the tracking system.
Hi
I .OV/DIV
0.5usec/DIV(DC)
(When playing
back the disc)
Waveform is unstable.
Yes
Check the spin system.
0.5s
1.00 v
ICI @ FD
Waveform in case of
normal play-back
0.55
10.0 v
10.0 v
ICI @ DRF
0.5s
2.00 v
ICl @TE
Figure 42-1
Figure 42-2
l :Checkth$ tiacking-system.
‘/ -- 2. :
:
Check waveform of ICl pin 7 (TE).
Check the periphery of
lC1 pins 41 and 42.
The waveform shown in Fig.
+ 42-3 appears, and no-disc
Tracking servo is
Yes ) inoperative.
state appears soon.
+i
Although IL is possible,
play is impossible.
t
Yes
Check the VCO-PLL system.
5ms
1 .oo v
ICl aTE
5 ms
5.0 v
ICI @ DRF
Figure 42-3
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