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Yes thank you i got the file i was after. There was a slight problem in my communication but it all worked out well.
A job well done.
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Great manual...really saved me. The only problem is that I thought I would be able to download it directly when I paid for it but never received the download instructions until the next morning. The board trace pages were somewhat light also: really need to turn up the contrast on the printer before printing them. The schematic page was great; very clear! Well worth the money.
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I've been in the electronic business for a long time. I used to buy Sam's Photofact for my needs which intailed having to go to the store and paying about $20 for a package of 3 different units so I was forced to buy more than I needed just to get one.
Owner manual is just at your keyboard and the information is almost instantansouly and the cost is very reasonable. Easy to print out if needed or simply read off of the screen. The larger the screen the better for obvious reasons.
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Very good manual, at a very good price. Received in a timely manner
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Only thу cover has poor quality, internal material has excellent quality - exactly what I needed
Thanks!
QT-CD141H/161H/162H
� Playback can only be performed when a disc is loaded.
Is the Focus servo active? (Can you hear it working?) No Yes
Check the laser diode driver. Check the area around IC801(16) - (21) (focus servo circuit).
Yes Does the DRF signal change from "L" to "H"? No Yes Yes Is HF waveform normal (see the Fig. 28-1, 2)? Yes Check the tracking system. Waveform is unstable. No
Level is abnormal.
If the disc is not turning, the DRF should not change to "H".
Check the spin system.
Check the periphery of IC801 pins 41 and 42. Yes
w
Check the spin system.
HF 0.1V/DIV 0.5µsec/DIV(DC) IC801 41 (When playing back the disc)
0.5s 1.00 V IC801 16 FD 0.5s 10.0 V IC801 12 CLV+ 0.5s 10.0 V IC801 54 DRF 0.5s 2.00 V IC801 7 TE
Waveform in case of normal playback
2 1 3 4
Figure 28-1 � Check the tracking system.
Check waveform of IC801 pin 7 (TE).
Figure 28-2
The waveform shown in Fig. 28-3 appears, and no-disc state appears soon.
Yes
Tracking servo is inoperative.
Yes
Check the periphery of IC801 pin 8 to pin 15, and IC803 to BI801/CNS801.
Play is possible in TEST mode.
Yes
The unit will be initialzed in Normal mode, but Yes it will not play back.
Normal jump is impeded, and the program top cannot be reached.
Yes
Check the periphery of IC801 pin 14.
Data cannot be read.
Yes
5ms 1.00 V IC801 7 TE
Check the VCO-PLL system.
4
5 ms 5.0 V IC801 54 DRF
3
Figure 28-3 � 28 �
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