SOURCE: MAKE MY TONEARM STOP SKATING
It's possible your weight adjustment has been mis-adjusted since you last used your turntable. On the tonearm, there should be a weight adjustment wheel. Turn this all the way towards the needle (IN). Now, adjust it backwards until there is no resistance in the tone arm - this is your zero point, reset the wheel on the weight adjustment knob to read 0. Now, adjust it forward to 3 grams of downward pressure. This is usually the minimum amount of force needed on a record. If it still skates at this setting, adjust it with gradual amounts of greater force until the skating stops.
SOURCE: Arm does not track properly but skips across records
Just guessing, but it sounds like you haven't counterbalanced your tone arm. When a tone arm skips, it's usually because there's too much counter weight on the rear of the tone arm. You want between 3-5 grams, but first you have to calibrate your tone arm (balance it so you know where zero is). If you don't know how to do this, refer to the Ion directions called "Tonearm Setup" in the instructions.
SOURCE: Turntable tonearm returns but starts playing record over again.
http://www.vinylengine.com/library/pioneer/pl-570.shtml
on page 8 of the above service manual for your model it shows 4 electrical switches that tell the computer what 'state' the mechanism is in at any given time. Either one or more of the switches are intermittant or the mechanism has dried up grease that is slowing down the operation and basically gumming up the works. the old grease would have to be removed and replaced when it is causing binding. The switch just to the right of where is says "microswitch ksf-023" is an 'open air' type and so would be the most likely suspect. it simply needs to be cleaned with a super fine file designed only for cleaning switch contacts. THIS SERVICE SHOULD ONLY BE PERFORMED BY QUALIFIED PERSONNEL ONLY!!!!!
SOURCE: JVC - problem. The turntable does not move,
Most modern day turntables are semi-automatic. You move the tonearm from the rest post
over to the record and the platter will start turning. There is a small microswitch inside
either below the arm base or near. There should be a flat bar connected to the base of the arm
and this will actuate the microswitch. The switch is wired in series to the rotation motor.
Solution: 1. Obviously verify the belt is on. Take off the rubber mat and rotate the platter.
The rotation motor is on the left and it has a small brass spindle. The belt should
be visable through the holes in the platter. If not pull the platter gently up, there will
be some resistance. The belt wraps around a smaller inner ring on the underside
of the platter and the rotation motor spindle. If it is degraded it will be stuck to the
platter or fall apart. Generally there 3 common sizes. ( 21.4 / 23.6 / 25 inch) they
readily available on E-Bay, search term "turntable belt".
2. Obviously check power.
3. Check the microswitch, it should "click", verify with ohm meter.
4. Some turntables have a "cut" or stop function. The arm must return first to rest before
starting again, again the microswitch is the trigger.
SOURCE: tonearm lifter in UP position - how to fix
I have also had this problem with the same model turntable. I opened mine up and the problem seems to have been that the grease on the arm lift and cueing lever was gumming up the linkage between the two. (I suspect that my turntable hadn't been used in some time.) I managed to free up the parts by manually working the the arm lift (pressing it down) several times. I'm not sure that I needed to open up the chasis for this fix but it did help me to see what was going on. Good luck with yours.
Tim Orange
Make a note of the tracking force setting.
Make sure the turntable is level.
Unplug the power to the turntable.
Using the tonearm elevation control, raise the tonearm.
Manually move the tonearm in toward the platter.
Manually rotate the platter ClockWise a few turns to disengage any cueing mechanisms.
Set the Stylus Pressure/Tracking setting to 0.
Disengage the tonearm elevation control. The tonearm will either float or drop. This is why we have no power, just in case it hits the platter.
Adjust the counterweight until the tonearm floats exactly horizontal. Use the flat portion of the tonarm rest as a gauge.
Return the tonearm to its rest.
Dial in the prescribed tracking force on the Stylus Pressure/Tracking control. Play records.
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