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Excellent service manual, the only known point of note is the alignment of improvability scanned pages within the pdf page. The resolution is good.
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I was very glad recieving the service manal from You. Additionaly very fast. Extremaly nice servicing. Thanks very mach! Now my GX-220 working better, than it was made. Alexander from Moscow, Russia/
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Sweet! I won the item on eBay and couldn't adjust the geometry or even keep a steady picure. This guide has the full schematics (not available anywhere else as far as I could tell), and was a bargain for the wealth of knowledge it contains. I hooked it up to my testing equipment, tweaked a few potentiometers and got it playing videogames in no time. Thanks!
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It was just what I need to fix my old BMW's CD player. Very convenient also. Thank you.
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Great Manual! It contains all the wiring schematics and mechanical exploded views that are essential for service and repair. I was surprised I even found this for such an old machine. Only wish I knew of this site many years ago.
2.4 TAPE TRANSPORT ADJUSTMENT In most cases the deck section is in need electrical adjustment, it results from replacement of worm mechanical parts or video heads. In the event of malfunction with electrical circuits, troubleshouting with the aid of proper test instruments most be done first, and then commence necessary repair, replacement and adjustment, etc. 2.4.1 Back tension 1. Set a cassette torque meter onto the deck and measure the back tension in standard REC mode to confirm that the back tension is 0.7x10-3 � 1.37x10-3 N�m. 2. If not, replace the tension band. When the value widely fluctuates in the measurement, replace the supply reel disk. 3. With the cassette torque meter, confirm that the play torque is 1.47x10-3 � 2.45x10-3 N�m. If necessary, replace the center pulley unit.
8. When the FM waveform breaks in the level varying process, subtly adjust the height of guide rollers at every breaking point so that the waveform varies as flat as possible. Repeat the above steps 6. and 7. several times to confirm that the waveform is flat as a whole. 9. Playback the SP stairstep signal of alighment tape and adjust the tracking control to maximize the FM waveform, confirm that FM waveform variation is always flat. 10. Record the signal and play it back in both of the SP and EP modes, and confirm that the FM waveform is flat in both modes. Note: Among the above-mentioned adjustment steps, the items of No.9 and No.10 are needed for the EP model only.
CH-2 1 field
Back tension 0.7x10-3 - 1.37x10-3 N�m (7-14gf·cm)
Play torque 1.47x10-3 - 2.45x10-3 N·m (15-25gf·cm)
Causer by wrong height of supply guide roller
Flatten waveform.
Caused by wrong height of take-up guide roller
Fig. 2-4-2 FM waveform-1
Fig. 2-4-1 Cassette torque meter 2.4.2 Tape pattern 1. Remove the Cover (JIG) shwon on Fig. 2-6-1 (Page 210). 2. Connect the jig connector cable to CN25 on the MAIN board as shwon on Fig. 2-6-1 (Page 2-10). 3. Observe signal at V. TP FM with external trigger from V. FF on the jig connector cable. 4. Playback the SP stairstep signal of the alignment tape and maximize the FM waveform by the tracking button. 5. Set the tracking control to the center position by simultaneously pressing the tracking (-) and (+) buttons and maximize the FM waveform by the tracking button. 6. If the observed FM waveform is not flat, adjust the height of the supply of take-up guide roller with the roller driver. Note: To prevent the tape from damage, turn the guide rollers slowly. 7. By operating the tracking button (both in + and � directions) in the manual tracking mode, vary the output level of the FM waveform from maximum to minimum and vice versa to confirm that the waveform varies nearly in a flat shape.
Correct variation of waveform
Bad variation of waveform
Fig. 2-4-3 FM waveform-2 (U)
2-7
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