|
|
|
Categories
|
|
Information
|
|
Featured Product
|
|
|
 |
|
|
There are currently no product reviews.
 ;
The manual describes this product very good. It has the basic things to know and also a more detailed look. Very well made!
;
An excellent document to assist in the repair of my old personal tape player. It includes full circuit diagrams and physical layout drawings and full instructions on disassembly and fault finding.
Well worth the meagre price.
;
Very good conversation, Pretty fast Service, wood do it again,
Have paid by Paypal, so i got the Service Manual online after 15 Min.
Very helpfully.
Greeting from Germany,
Hans
;
Good-quality scans. Detailed description. I hope I can repair the machine.
;
High-quality scanning. Detailed description. Recommend for all technician. A+++
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 �
|
|
|
> |
|
