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I will definitely be back for more information when I need it.
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The service manual when downloaded and printed out was clear and easy to read. I would have liked to have been able to enlarge some details, but this was not possible as the file permissions did not allow this. The service was very good. The time taken from placing my order to downloading the document was only a few minutes.
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The manual is useful for trouble shooting for an old instrument. It saved money,and let me enjoy DIY.
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Perfect source of information for replacing the HDD and performing general diagnostics.
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Perfect source of information for replacing the HDD and performing general diagnostics.
SECTION 6 ELECTRICAL ADJUSTMENTS
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.
11. Turn OFF the power, and remove the lead wire connected at step 7.
Note : A clear RF signal waveform means that the shape ��� can be clearly distinguished at the center of the waveform.
RF signal waveform
S Curve Check
oscilloscope BD board TP (FE) TP (VC) + �
VOLT/DIV : 200 mV TIME/DIV : 500 ns level: 1.8 +0.3 Vp-p �0.2
Procedure : 1. Press the I/u button and turn ON the power supply. 2. Open the front cover, and press the [PLUS ONE] button. 3. Set the disc (YEDS-18) into the �PLUS ONE� slit. 4. 5. 6. 7. Close the front cover, and chuck the disc. Press the I/u button and turn OFF the power. Connect the oscilloscope to TP (FE) of the BD board. Connect TP (ADJ) of the MAIN board and connect TP (GND) with a lead wire. 8. Press the I/u button and turn ON the power. 9. The first track will be played back automatically. When the
E-F Balance (Traverse) Check The procedure for this checking method differs for when a general remote control unit is used and not used.
oscilloscope BD board TP (TE) TP (VC) + �
[CHECK] button is pressed, �S-JI mode� will be displayed on
the fluorescent indicator tube, and focus search will be repeated. 10. Check the oscilloscope waveform (S-curve) is symmetrical between A and B. And confirm peak to peak level within 1.8 ± 0.6 Vp-p.
S-curve waveform symmetry
When a general remote commander is used: 1. Press the I/u button and turn ON the power supply. 2. Open the front cover, and press the [PLUS ONE] button. 3. Set the disc (YEDS-18) into the �PLUS ONE� slit. 4. Close the front cover, and chuck the disc. 5. Press the I/u button and turn OFF the power. 6. Connect the oscilloscope to TP (TE) of the BD board. 7. Connect TP (ADJ) of the MAIN board and connect TP (GND) with a lead wire. 8. Press the I/u button and turn ON the power. 9. Playback the fifth track of the disc. 10. Press the [3] button on the remote commander. (The tracking servo and the sledding servo are turned OFF.) 11. 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 ± 10%
Traverse waveform B A (DC voltage) 0V Center of the waveform
A within 1.8 ± 0.6 Vp-p B
11. Turn OFF the power, and remove the lead wire connected at step 7.
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 (AC range) BD board TP (RF) TP (VC) + �
level: 0.9 ± 0.45 Vp-p
12. Press the [8] button on the remote control unit. (The tracking servo and sledding servo are turned ON.) Confirm the C (DC voltage) is almost equal to the A (DC voltage) is step 11.
Traverse waveform
Procedure : 1. Press the I/u button and turn ON the power supply. 2. Open the front cover, and press the [PLUS ONE] button. 3. Set the disc (YEDS-18) into the �PLUS ONE� slit. 4. Close the front cover, and chuck the disc. 5. Press the I/u button and turn OFF the power. 6. Connect the oscilloscope to TP (RF) of the BD board. 7. Connect TP (ADJ) of the MAIN board and connect TP (GND) with a lead wire. 8. Press the I/u button and turn ON the power. 9. Playback the fifth track of the disc. 10. Confirm that oscilloscope waveform is clear and check RF signal level is correct or not.
0V
C (DC voltage) Tracking servo Sled servo OFF Tracking servo Sled servo ON
13. Turn OFF the power, and remove the lead wire connected at step 7.
� 17 �
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