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Complete manual as pdf-file in very good quality. Very helpful and fast availability.
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Complete service manual in very good scanning quality with all schematic and PWB graphics as well as assembly & maintenance instructions. A slight drawback is that the rastering of the PWB graphics sometimes makes it a bit difficult to follow fine traces, but no showstopper.
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Purchased the manual that I was looking for at a great price and could download it easily.. Great service experience and for future purchases I plan to use the site. Thank you very much
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Service manual in good quality, it was very helpful to me. Perfect service, I am very satisfied.
Jochen Kelm
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Exellent manual ,it was in great condition,and got all the info i expected,5 stars!!
SECTION 5 ELECTRICAL BLOCK CHECKING
Note: 1. CD Block is basically designed 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 TP (FE) TP (VC) BD board
Note: A 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 : 1.3 �0.20 Vp-p
+0.25
E-F Balance (1 Track Jump) Check (Without remote commander)
oscilloscope
Procedure : 1. Connect oscilloscope to test point TP (FE) on BD board. 2. Connect between test point TP (FEI) and TP (VC) by lead wire. 3. Turn Power switch on. 4. Put disc (YEDS-18) in and turn Power switch on again and actuate the focus search. (actuate the focus search when disc table is moving in and out.) 5. Check the oscilloscope waveform (S-curve) is symmetrical between A and B. And confirm peak to peak level within 3±1 Vp-p.
S-curve waveform
symmetry
TP (TE) TP (VC)
Procedure : 1. Connect oscilloscpe to test point TP (TE) on BD board. 2. Turn Power switch on. 3. Put disc (YEDS-18) in to play the number five track. 4. Press the �P (Pause)� button. (Becomes the 1 track jump mode) 5. Check the level B of the oscilliscope's waveform and the A (DC voltage) of the center of the Traverse waveform. Confirm the following : A/B x 100 = less than ± 22%
1 track jump waveform
A within 3 ± 1 Vp-p B B A (DC voltage) 0V Center of the waveform
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)
level : 1.3 ± 0.6 Vp-p
symmetry
E-F Balance (Traverse) Check (With remote commander)
oscilloscope BD board TP (TE) TP (VC)
Procedure : 1. Connect oscilloscope to test point TP (RF) on BD board. 2. Turn Power switch on. 3. Put disc (YEDS-18) in to play the number five track. 4. Confirm that oscilloscope waveform is clear and check RF signal level is correct or not.
Procedure : 1. Connect oscilloscpe to test point TP (TE) on BD board. 2. Connect the test point TP1 (ADJ) on MAIN board to the ground with a lead wire. 3. Turn the Power switch on to set the ADJ mode. 4. Put disc (YEDS-18) in to play the number five track. 5. Press the �3� button. (The tracking servo and the sledding servo are turned OFF.)
�8�
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