I've been trying to figure out what is the problem with an old Pioneer PL 55, and early direct drive. Initially the problem seemed to be the oddball sequencing mechanism, which integrates (and damps so its all slow motion) the on off and the cuing, and a visibly bad capacitor in the power supply. Got that sorted out (cleaned out dried up lubricants and replaced the cap), but here's the problem: When you first turn the thing on, nothing much happens -- the platter moves a little, often the wrong way, and then as time passes its starts to actually rotate (especially if given a push or two) but not uniformly. More time, and it gets up to speed but wanders. And after about five minutes, it goes rock steady, and will start up instantly if you turn it on and off. But wait a day, and you are back at the bad behavior.
I've cleaned pots and the main bearing, looked for bad solder joints but can't find a schematic to help identify if components are bad. Its an early servo DD, so all parts are discrete, but the actual stators and their board are glued into the cast metal cup that holds the whole motor so I can't inspect the underneath.
I assume (without any actual reason) that if some of the stators are bad, the speed should vary even after warming up. But what would cause this problem?
Its not a great table (doesn't even have a strobe) and the arm is just a shinier PL 12d arm, but its nice looking, and I'd like to get it up and running.
I've cleaned pots and the main bearing, looked for bad solder joints but can't find a schematic to help identify if components are bad. Its an early servo DD, so all parts are discrete, but the actual stators and their board are glued into the cast metal cup that holds the whole motor so I can't inspect the underneath.
I assume (without any actual reason) that if some of the stators are bad, the speed should vary even after warming up. But what would cause this problem?
Its not a great table (doesn't even have a strobe) and the arm is just a shinier PL 12d arm, but its nice looking, and I'd like to get it up and running.
