Platter not spinning

SOURCE: JVC Turntable won't turn, motor works, can't remove platter

http://www.vinylengine.com/library/jvc/jl-a20.shtml
Looks like this is a belt drive model.

http://www.turntablebasics.com/belts/jvc.html
This site claims to provide installation instructions with belt purchase. Good Luck.

SOURCE: tone arm comes out and touches record, then goes back to cradle

See what kind of arm position sensing elements are used in your turntable (micro switches, optics or possibly other) and check if they work correctly - sometimes a microswitch can be damaged or have oxydized internal contacts or a badly soldered / broken wire and it will not function properly, causing the unit to stop automatically, the same might happen if the sensor is of optical type and there is some dust or broken wires or if the emmiter or sensor is damaged. Also, it could be a problem with the part that activates the switch / optics, it might be displaced or damaged.

If all sensors / switches seem to work well, then check the section which has wires going to those sensors / switches, it's the next probable location of the fault (it might be an electronic controller so there could be damage to some components, broken wires, dirty connectors or bad solder contacts).

It could as well be something else in the mechanisms, wiring or electronics, i just suggested a few things that might cause the malfunction you described.

Hope you can get it fixed.

regards

3rq8 (Triarcuate)

SOURCE: platter wont spin on stanton

The belt that drives the platter may have shifter or the gears that turn the platter may be unaligned. Open it up yourself and check out the inside but be careful not to break anything or go into a local music/dj store. they may be able to help you for cheap or for free.