I have a Sharp GF 5757 boombox. Nothing that special, but the wow and flutter is horrible. I changed out the belt, but there was no improvement. The motor itself seem to change speeds on its own. Turning the speed control screw on the motor does not give consistent results. Either the motor needs replacement or the power that regulates the motor is failing. So I bought a motor with the same dimensions, thinking, well I'll just adjust the screw to the right speed. Turns out, the motor is way too fast even when the screw is turned all the way down. I can't find a replacement motor anywhere with the exact model number, but there's plenty of electric motors on eBay. I'm sure one of those is what I'm looking for, but how do I go about knowing which one to get? The model number of the stock motor is MPM DC9V 262A. Any help or direction would be greatly appreciated!
I don't much about motors but I'd look for the following specs, Clockwise (CW) or Counter Clockwise (CCW) RPM Volts Size and mounting plate Amps Shaft length and type of connection. I think that's a Matsushita Motor, maybe CW rotation, search 9 volts and see what comes up.
I did get most everything down- except RPMs. Specifications on the service manual don’t say, and most boombox motors on eBay don’t say.
Motors have always puzzled me, there's so many variations. I work with them with shop tools and pumps and it's a little easier, most have similar mounting and wiring. My big pumps are three-phase knocked down with a VFD which gives you the ablity to change the motor RPM with a rotary switch, although you lose about 20% of the motor power. I was looking through the old MCM (Newark) catalog I've posted before, that's on archive.org, they had some of the other brands listed but not Matsushita. There has to be old catalog pages out there with the common motors.
