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Aiwa F770 cassette from 1985

carrier

pulley.

but

to

both new bands and cleaned pulleys. moving from REW to play causes the band to fall off, presumably due to a snatching / breaking / imbalance associated with this double connection to the tape presumably at take up. If I put in a guide then it can't fall off and will presumably self centre back up the vague hump on the periphery of the "reverse" flywheel. On baluster/ bulbous motor pulleys they usually have a preventer disc either side of the bulging active part. This pulley has a larger pulley on one side but nothing on the other in the way of a preventer.

Reply to
N Cook
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N Cook ha escrito:

Hmmm....if thers no sign of there having being a preventer in the past, i'd be inclined to think that the belt is not the correct replacement - too slack?? It should be albe to withstand the change of tension without slipping or wandering.

-B.

Reply to
b

band

associated

centre

either

side

No signs of any preventers removed. I think its the other way round. The one I replaced it with was a bit too short/tight as you would normally do, it is probably highly critical. The problem point is at moment of power switch on so the trailing pulley is static, so inertial slack in the belt . The force in the belt to pull it down the vague hump is higher than the differential force at the hump to push it to the maximum part of the hump it would seem. If it rides down initially to the axial paired larger pulley then no trouble but if it goes the other way it falls off.

-- Diverse Devices, Southampton, England electronic hints and repair briefs , schematics/manuals list on

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Reply to
N Cook

Have you checked for slight wear in the bearing of the shaft with the barrel shaped pulley? Is the new belt the same width as the old one?

Ron(UK)

Reply to
Ron(UK)

I've come across this one occasionally, and have fixed it by adding a fixed guard each side, not by the drivewheel but beside the belt close to where it goes onto the wheel. That way the belt momentarily impacting the guard does not cause problems, and steers it properly on the wheel.

I dont know why or how this can happen, but the fix works.

NT

Reply to
meow2222

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