|
|
|
Who's Online
There currently are 5710 guests online. |
|
Categories
|
|
Information
|
|
Featured Product
|
|
|
 |
|
|
There are currently no product reviews.
 ;
Do a quick order, scan quality is high.
I recommend to all!
;
This manual is perfect! Just what I needed. Thanks!
;
This manual was very clear and complete, the prices can't be beat, great to have older manuals available!
 ;
Doubted for buy this manual as it is my first order here and at not have cover image, I assumed would haven't. However, within 24 hs, already possessed the link to download it. The manual are scanned correctly and have all what is needed. Includes adjustments and diagrams of all circuits. Very satisfied.
;
Really good quality, аll readable.! Wonderful work shop. I recommend to all!
CD SECTION
Note: 1. CD Block is basically constructed to operate without adjustment. Therefore, check each item in order given. 2. Use YEDS-18 disc (3-702-101-01) unless otherwise indicated. 3. Use an oscilloscope with more than 10M� impedance. 4. Clean the object lens by an applicator with neutral detergent when the signal level is low than specified value with the following checks. S Curve Check
oscilloscope BD board
Note: Clear RF signal waveform means that the shape ��� can be clearly distinguished at the center of the waveform.
RF signal waveform
VOLT/DIV : 200mV TIME/DIV : 500ns level : 1.45 ± 0.25 Vp-p
E-F Balance (1 Track Jump) check
oscilloscope BD board TP (FE) TP (VC) + � TP (TE) TP (VC) + �
Procedure : 1. Connect the oscilloscope to test points TP (FE) and TP (VC). 2. Connect TP (FEI) and GND, and TP (AGCCON) and GND of the BD board with lead wires. 3. Press the 1/u button to turn the set ON. 4. With the disc (YEDS-18) loaded, press the ·P button and perform focus search. (Focus search will be performed in the same way even while the disc table is pushed in and out.) 5. Check the symmetry and peak to peak level of the oscilloscope waveform (S curve) at this time.
S-curve waveform
symmetry
Procedure: 1. Connect oscilloscope to test point TP (TE) on BD board. 2. Press the 1/u button to turn the unit ON. 3. Put disc (YEDS-18) in to play the number five track. 4. Press the ·P button. 5. Check the level B of the oscilloscope's waveform and the A (DC voltage) of the center of the Traverse waveform. Confirm the following: � A/B x 100 = less then ± 22 (%) � B = 1.3 ± 0.6 Vp-p
1 track jump waveform
Center of the waveform
A Within 4 ± 1 Vp-p B
B A (DC voitage)
0V
6. After check, remove the lead wire connected in step 2. Note: � Try to measure several times to make sure than the ratio of A : B or B : A is more than 10 : 7. � Take sweep time as long as possible and light up the brightness to obtain best waveform. RF Level Check
oscilloscope BD board TP (RF) TP (VC) + � TP (VC)
Symmetry level : 1.3 ± 0.6 Vp-p
Adjustment Location : [ BD BOARD ] � SIDE A �
Procedure : 1. 2. 3. 4. 5. 6. Connect oscilloscope to test point TP (RF) and TP (VC) on BD board. Connect TP (AGCCON) and GND of the BD board with lead wires. Press the 1/u button to turn the set ON. Put disc (YEDS-18) in and playback 5 track. Confirm that oscilloscope waveform is clear and check RF signal level is correct or not. After check, remove the lead wire connected in step 2.
TP (RF)
TP (AGCCON) TP (FE) TP (TE) TP (FE1)
� 18 �
|
|
|
> |
|
