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Fully functional usable service manual. Considering the age of the manual and device quality was better than expected
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Thank you very much, I've been very happy to find this manual on "Owner Manual". It's a perfect copy and it has been really useful for my work!
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It took about 24-hours after my payment before I was able to get to the download. Apparently, payment processing is not 100% automated. That is no big deal, just be aware of that going in.
After I got to it, it was in good shape, easy to read, etc. Not some cheap FAX copy looking thing.
Also, this site was the cheapest I found. Another Plus!
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Good price, very legible manual, exactly what I needed -- but had to wait a day to actually get the download of the manual. Would have preferred to download it immediately after payment rather than waiting for someone to "process" my order. I was surprised that I had to wait that long.
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As the only source for this manual it rather rank quite high since it is well scanned and perfectly readable.
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 ± 0.3 Vp-p
Checking Location : BD board E-F Balance (1 Track Jump) check
oscilloscope TP (FE) TP (VC) + � TP (TE) TP (VC) + � BD board
Procedure : 1. Connect the oscilloscope to test points TP (FE) and TP (VC). 2. Connect TP (FEI) and Ground, and TP (AGCCON) and Ground 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 ( 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) and TP (VC) 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 ( 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
IC103
B A (DC voitage)
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. Checking Location : BD board RF Level Check
oscilloscope BD board TP (RF) TP (VC) + �
0V
Symmetry level : 1.3 ± 0.6 Vp-p
Checking Location : BD board Checking Location : BD board [ BD BOARD ] � SIDE B �
TP (VC) IC102 TP (RF) TP (AGCCON) TP (FE) IC101 TP (TE) TP (FEI)
Procedure : 1. Connect oscilloscope to test point TP (RF) and TP (VC) on BD board. 2. Connect TP (AGCCON) and Ground of the BD board with lead wires. 3. Press the 1/u button to turn the set ON. 4. Put disc (YEDS-18) in and playback 5track. 5. Confirm that oscilloscope waveform is clear and check RF signal level is correct or not. 6. After check, remove the lead wire connected in step 2.
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