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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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Direct drive cassette motor drive
Capstan drive , motor and conventional belt, contrarotating different
size spindles, 1.89 and 2.09 mm. But FF/REW and spool take up is a second, 2 wire motor, with no slip clutch, cog to cog to cog, reversible via jockey swing-arm assembly . The first drive cog is different to all I've ever seen with teeth about 3 times longer than usual, usual pitch. Long teeth for some give/reduced noise? There is a hall sensor under the (normal direction drive) take up spool, is that used not just to sense a stop/jam but to give a variable feed to the main motion motor. Even then it has to be more drive than exactly required , by some degree, so does design allow for the motor to be used as a sort of slip clutch, as a DC motor not precise stepper motor Yamaha rare heavy ghetto blaster AST C10, 1989, otherwise just (just - hah-hah, horrible topology puzzle to get there) needs the rubber bands changing to silicone rubber bands ( futile exercise replacing with contemporaneous neoprene bands and no known suppliers who state they stock newly manufactured flat bands) |
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