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Very detailed product, also it is a scanning from original, very useful if you have to service this type of amplifier ! Very good product, very hard to find!
the Manual was made available as promised, the scans were excellent..Good Work !!!
It's complete and helpful manual with good quality of scan. Thanks very much.
The service was quick and simple, finding the service manual easy and it appears to be the original with colour schematics. It contained the info I was after and so sorted the problem.
I have copied it to CD and attached the envelope to the inside back cover of the owners manual. Good manual and excelent service. Robin Wood, Wood Electronics, New Zealand.
Exactly what was needed to assess the product - excellent value and great service
Note : A clear RF signal waveform means that the shape âââ can be clearly distinguished at the center of the waveform.
RF signal waveform
VOLT/DIV : 200mV TIME/DIV : 500ns
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 10Mâ¦ 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) + â
level : 1.3 +0.25 Vp-p
E-F Balance (Traverse) Check
oscilloscope BD board
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. Turned Power switch on. 4. Put disc (YEDS-18) in and turned 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 3Â±1 Vp-p.
TP (TE) TP (VC)
Procedure : 1. Connect oscilloscpe to test point TP (TE) on BD board. 2. Connect the lead wire to both ends of the land of SL702 (ADJ) and SL703 (AFADJ) of the VIDEO board. 3. Turned Power switch on. Press FUNCTION button to select CD. 4. Short the lead wire. 5. Put disc (YEDS-18) in to play the number five track. 6. Press the REPEAT button. (The tracking servo and the sledding servo are turned OFF.) 7. 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 Â± 22%
Center of the waveform
A Within 3 Â± 1 Vp-p B
6. After check, remove the lead wire connected in step 2. Note : â¢ Try to measure several times to make sure than the ratio of A : B or B : A is more than 10 : 7. â¢ 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) + â
B 0V A (DC voltage)
level : 1.3 Â± 0.6 Vp-p
8. Press the REPEAT button. (The tracking servo and sledding servo are turned ON.) Confirm the C (DC voltage) is almost equal to the A (DC voltage) is step 7.
Procedure : 1. Connect oscilloscope to test point TP (RF) on BD board. 2. Turned 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.
C (DC voltage)
Tracking servo Sled servo OFF
Tracking servo Sled servo ON
9. Remove the lead wire connected step 1.
â 15 â