Hi
Pressing turn starts the turntable rotating but does not permit the arm to move to the start position. It is used to clean a disc prior to playing. If the turntable does not rotate when turn is pressed then something is wrong.
Assuming that the arm does move to the start position when you press Start, if the arm is not dropping then you need to check the solenoid action. The solenoid might be stuck after a long time with no operation. The solenoid on my unit was partly stuck and had to be lubricated to get it to work freely again. In my case, the arm now drops too quickly and there seems to be a delicate balance between a damped fall and a totally free fall operation. I raised the question on this forum but no-one was able to advise me of the correct procedure for setting up the solenoid.
Good luck
Geoff