The pressure arm at the sound drum were stuck, and needed a cleaning and lubrication to work again.

And the loop-restorer arm was also stuck, and it too needed a cleaning and lubrication to work.

The rubber belts arrived, and are now in place.

And the auto-thread system arm were cleaned and lubricated as well, since it too were stuck.

The projector now works, but the sound is very distorted.
I will take the amplifier board out and see if the capacitors needs replacement.
(They are old, så they may have dried out.)

I did a little modification to the mic input jack, so now it is used as a line out instead.
That way i could connect an external amplifier to check if the sound is distorted before the built in amplifier, or if it is the amplifier itself that is the problem.

Sound were fine when i used the line out jack, so it seems that the capacitors on the amplifier board needs replacement.