Motor turns feebly, not enough to make the platter
Pioneer PL-990 turntable, several years old. Turned it on for the first time in over a year. Lights up, but platter doesn't turn. Upon removing platter and belt, I find that the motor turns feebly, but not enough to make the platter turn. Bad belt?, Needs oil?
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Re: motor turns feebly, not enough to make the platter
Sounds like the motor is bad if you say it turns feebly. See if you can turn the drive shaft with your fingers easily. If you find it hard, it's possible that something might have worn out. You could try oil in that case.
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PUT IT ROUND THE PLATTER BASE FIRST,THEN LOOP A BIT OF STRING ROUND THE BELT LONG ENOUGH, SO WHEN YOU PUT THE PLATTER BACK ON,YOU CAN LIFT IT UP A LITTLE BIT WHERE THE MOTOR WHEEL IS THAT TURNS THE BELT, PULL THE STRING TOWARDS IT SO THE BELT GOES OVER IT.DROP THE PLATTER THEN PULL THE STRING OUT.
This turntable is a belt driven type. The belt wraps around the underside of the platter and the drive motor spindle. If the belt has slipped off, broken or is so old that it is slipping - the platter will not turn. Usually you can remove the rubber cover on the top of the platter to use access openings beneath to put the belt back on.
The turntable product brochure, owner's manual and related info is available from Pioneer, here.
try cleaning the inner ring on the underside of the actual turntable platter and also the motor spindle using isoprynol alcohol or use neat clear spirits like bacardi/vodka with cotton wool etc. if black residue comes off either the platter or the motor spindle that will be residue from the old belt that could cause the fluctuation in speed? good luck.
Lift off the platter mat, then lift off the platter from the spindle - gently. Underneath the platter is a sub-platter around which you place the belt - it should be held there by the stretch of the belt while you turn the platter back up the right way and place it back on the spindle. Turning the platter by hand, you should see a small pulley come into view through one of the holes in the platter. You then stretch the belt slightly so that it slides over the pulley. Take care not to twist the belt while doing this.
It sounds like the motor pulley is too high. try to screw down the pulley, maybe it came loose...The platter is designed specifically for the turntable and should fit perfectly in place....Another reason might be that the platter does not belong to the turntable, it might be too small and therefore sits lower than it should.
That is the drive belt for the turntable . It's not that hard to set up. Take the mat off the platter and wrap the belt around the underneath -slightly-less-diameter portion.
With a pointed end needle or something like it , put the tip between the belt and the platter portion it's wrapped against. Pull the belt away from that( keeping the rest of the belt on the platter portion) and set it over the motor pulley. This is usually a small diameter brass spindle unit
Lift the platter. PLace the belt under the platter on the inside ring. PLace it back on the turntable, and you can stretch it back onto the motor with your finger or black stick through one of the holes on the platter, while the platter is positioned where it is accessible. if you need a replacement, try...