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I PURHASED THIS PRODUCT BECAUSE I WAS HAVING PROBLEMS WITH MY CDR20 HARMAN KARDON RECORDER. WHICH I PURCHASED NEW 12 YEARS AGO. AFTER REVIEWING THE MANUAL, I WAS ABLE TO ADJUST THE TENSIONER IN THE SYSTEM. WORKS LIKE A CHAMP!.
SAVED ME AT LEAST 100.00 WHICH WAS WHAT A SERVICE REPAIR STATION WANTED. GREAT MANUAL EASY TO READ. SPECIALLY AFTER I PRINTED THE PAGES WHICH DEALT WITH MY RECORDER. THANKS A LOT!!!!!!!!
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You can fully trust on this one!
All the schematics are very crear an in one piece per page
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I have never bought a service manual which is as competely readable as this althogh it was a scanned pdf. Thank you for this succesful manual also cheaper than other sites.
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Thanks for a very good and readable servicemanual. Just what I needed as a "dinosaur technician". I really recommmend this site and will come back.
Åsbjörn
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The manual I purchased was just what I needed. I was glad to find a site where I can find so many manuals on a wide variety of products.
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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