|
|
|
Who's Online
There currently are 5373 guests online. |
|
Categories
|
|
Information
|
|
Featured Product
|
|
|
 |
|
|
There are currently no product reviews.
 ;
Very quality copy of original service manual, which contains the circuit diagrams, PCB and lists of components, well as recommendation for calibration procedures of device, also everything else, that need for repair, tuning and use this oscilloscope.
All presented copies have high-resolution, so you can view all in detail.
This manual will very useful for simple owners and for repairers.
I recommend these manual, because myself is owner of Philips PM3216 and I need sometimes servicing these oscilloscope (principally calibrating).
Also, these document is an example of excellent design of technical documentation.
;
Excellent printing quality.
A complete and very usefull service manual with all details.
GREAT SERVICE AT VERY LOW PRICE!
A+++++++++++++++++++++++++
 ;
manual excelente completo , diagramas y esquemas bien presentados y buena calidad de imagen.
;
muy buen manual completo de buena calidad de impresion preciso y detallado , muy útil para la reparación.
;
The service manual is a good quality scan of the Panasonic NV-850, which is electrically identical to the Philips VR 6920, but mecanically just nearly.
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 �
|
|
|
> |
|
