GX-CD30/30C/130/130C
Y Playback can only be performed when a disc
is loaded.
Is the Focus servo active? (Can you hear it working?)tCheck the laser diode driver.
NoCheck the area around IC801(16) - (21) (focus servo circuit).
Yes
tYes
Does the DRF signal change from "L" to "H"?tIf the disc is not turning, the DRFCheck the spin
Noshould not change to "H".system.t
Yes
Yes
t
NoCheck the periphery
Is HF waveform normal (see the Fig.11-1, 2)?tLevel is abnormal.t
of IC801 pins 41 and
42.
Yes
Yes
t
Check the tracking system.tWaveform is unstable.tCheck the spin
system.
HFWaveform in case 0.5s
0.1V/DIV1.00 Vof normal play-
0.5?sec/DIV(DC)IC801 16 FDback
(When playing
0.5s
back the disc)
10.0 V
IC801 12 CLV+
2
1
0.5s
310.0 V
IC801 54 DRF
4
0.5s
2.00 V
IC801 7 TE
Figure 11-1Figure 11-2
Y Check the tracking system.
Check waveform of IC801 pin 7 (TE).
tThe waveform shown in Fig. 11-3tTracking servo is inoperative.tCheck the periphery of IC801
appears, and no-disc state appearsYesYespin 8 to pin 15, and IC804 to
soon.BI801/CNS801.
tPlay is possible in ttAlthough IL is possible,Normal jump is impeded, and theCheck the periphery oft
TEST mode.Yesplay is impossible.Yesprogram top cannot be reached.YesIC801 pin 14.
tData cannot be read.tCheck the VCO-PLL system.
Yes
5ms
1.00 V
IC801 7 TE
4
5 ms
5.0 V
IC801 54 DRF
3
Figure 11-3
� 11 � |
ACEC
