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Exactly what was needed to assess the product - excellent value and great service
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A site where discontinualed schematic diagrams and back dated information can be found on discontinued radios tv's and any electronic equipment can be found. Newer manuals either Service and operating manuals. Radio amateurs should find this site a great source for ham radio equipment manuals. I will return to this site should I need information on any electrical equipment. priced easy to download in a PDF format and print pages need to undertake the repair.
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Quality scan of the original. All the detail necessary to troubleshoot, repair and adjust the unit. I'm sure I will be downloading more manuals in the future as the need arises.
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Exactly as described, a Service Manual complete with the schematics and PCB layout delivered in a timely manner. Many thanks for the great service.
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some of the writing is a bit blur but the part in the schmatic was great and i have fixed the machine thanks
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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