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Electronics Repair (sci.electronics.repair) Discussion of repairing electronic equipment. Topics include requests for assistance, where to obtain servicing information and parts, techniques for diagnosis and repair, and annecdotes about success, failures and problems. |
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Aiwa F770 cassette from 1985
According to the internet a respected deck in its day.
Had to deal with the slip clutch buried in the mechanism. Photoed before disassembly just in case. Reassembled and the 2 pinch wheels were fighting one another. A strange pair of springs one acting against the other for the "reverse" pinch wheel assembly. I must have put one of these springs back with wrong anchor position. Correcting that and its playing and FF and REW ok. These units are called 4 head, 4 pairs of screened stereo wires going to the head but all seem to relate half the tape. So one question is why 2 pinch wheels when there seems to be no proper "reverse" side play or loop control function as a fixed head. Repeat sends back to replay the same side. The "reverse" pinchwheel seems to operate only just clear of the reverse capstan spindle and has a strange guide that protrudes around the pinchwheel and into the recess of the cassette - what is the function of that protrusion and a non pinching pinch wheel ? What do the 4 stereo heads do ? -- Diverse Devices, Southampton, England electronic hints and repair briefs , schematics/manuals list on http://home.graffiti.net/diverse:graffiti.net/ |
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