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Excellent quality service manual. Quick processing, fair prices. Love to do business again. Thank you!!!
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Excellent service manual, the only known point of note is the alignment of improvability scanned pages within the pdf page. The resolution is good.
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I was very glad recieving the service manal from You. Additionaly very fast. Extremaly nice servicing. Thanks very mach! Now my GX-220 working better, than it was made. Alexander from Moscow, Russia/
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Sweet! I won the item on eBay and couldn't adjust the geometry or even keep a steady picure. This guide has the full schematics (not available anywhere else as far as I could tell), and was a bargain for the wealth of knowledge it contains. I hooked it up to my testing equipment, tweaked a few potentiometers and got it playing videogames in no time. Thanks!
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It was just what I need to fix my old BMW's CD player. Very convenient also. Thank you.
CD-C831W
� Playback can only be performed when a disc is loaded.
Is the Focus servo active? (Can you hear it working?) Yes Yes Does the DRF signal change from "L" to "H"? Yes Yes Is HF waveform normal (see the Fig.37-1, 2)? Yes Check the tracking system. Waveform is unstable.
0.5s 1.00 V IC1 16 FD 0.5s 10.0 V IC2 13 CLV+ 0.5s 10.0 V IC1 54 DRF 0.5s 2.00 V IC1 7 TE 2 1 3 4
No
Check the laser diode driver. Check the area around IC1(16) - (21) (focus servo circuit).
No
If the disc is not turning, the DRF should not change to "H".
Check the spin system.
No
Level is abnormal. Yes
Check the periphery of IC1 pins 41 and 42.
Check the spin system.
Waveform in case of normal play-back
HF 1.0V/DIV 0.5µsec/DIV(DC) IC1 41 (When playing back the disc)
Figure 37-1 � Check the tracking system.
Figure 37-2
Check waveform of IC1 pin 7 (TE). The waveform shown in Fig. 37-3 appears, and nodisc state appears soon. Tracking servo is inoperative. Yes Check the periphery of IC 1 pin 8 to pin 15, and IC 3 to CNP2.
Yes
Play is possible in TEST mode.
Yes
The unit will be initialized in Normal mode,but it will not Yes playback.
Normal jump is impeded, and the program top Yes cannot be reached.
Check the periphery of IC 1 pin 14.
Data cannot be read.
Yes
Check the VCO-PLL system.
5ms 1.00 V IC1 7 TE
4
5 ms 5.0 V IC1 54 DRF
3
Figure 37-3 � 37 �
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