Paasche D500SR Problems

some side note, the stop motion the motor makes is the main reason that the counter weight is dislocated, if you had everything setup up but keep the compressor power on without using, the motor will constantly do an quick start/stop motion to fill the little air that had lost while left on, this will cause the counter weight to dislocate rather fast

the problem is probably because the counter weight was dislocated from the motor through intense use, to check and fix this, open the front hatch (the side with the regulator and stuff), the counter weight, which is a piece of magnet, is right inside, normally it should be locked onto the metal handle on the side that is facing you, and screwed onto the motor on the other, if the metal handle isn't doing motions while the motor is running, then the counter weight had dislocated on the motor side, you can try to relocate it from here, but it's kind hard, or you can open the hatch on the other side, while inside, remove

FOUR long screw in there, and the compressor body should be able to split in two part from the middle, then you can just screw the rotor onto the counter weight, easy fix

It sounds like the motor is not turning or the piston binds. Does the motor case get hot quickly? If it does, do not leave it on.

If the D500SR is less than one year old, contact Paasche for a replacement or repair under warranty. It it is older than a year, it may be time to look for a new compressor. The "made-in-China" airbrush compressor (no matter what brand it is) has a large percentage of early demise.

If you want to do something yourself, look at the D500SR parts breakdown picture and identify the starter capacitor. You can try replacing it and see if it helps.