Small update :
After replacing all of the capacitors on the amplifier board the sound is back to normal, and this Eiki are now fully operational.

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.

The focus knob did not work, and after disassembly it became clear what the problem was.
The rubber that were supposed to turn the lens forwards and backwards was dried up and had crumbled to pieces.

A piece of rubber hose sandpapered to correct size did the trick.

This is an EIKI RT-0 16mm film projector.

It has sat for a very long time and needs an overhaul.
Most of the moving parts are almost stuck, and needs to be cleaned and lubricated.
All of the rubber bands needs to be replaced, since they all have deteriorated.