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Hi Mark, I am not an expert but you could take a look at the brushes on the motor. The motor on my GS 1200 doesn't work at all, the last time I used it it was fine, then nothing. I looked at the brushes and one of them was broken. I have ordered some new brushes and with a bit of luck this will solve the problem, if not I'm lost.
I hope this helps and good luck.
Had this similar symptom to my Fujicascope projector. The motor sorted of work, or very sluggish, or does not move at all some times. This happened in a totally random manner. I literally teared it apart and checked everything, power socket, rotary switch, transformer, power supply board, etc, but nothing suspicious.
Only when I'm about to give up and junked it away that I noticed TONS of gunk around the armature, to the point that it prevented good contact to the brushes. Total motor teardown/cleaning & half an hour later, it's back to full life.
Further on from Nantawat's comments above, over time black deposits of carbon also build up on the armature. This prevents the current getting through. Motor will not run.
Mark I had the same trouble with my GS1200 and all it turned out to be was a oxidized terminal above the motor brushes a 5 minute fix.
It might also be a faulty micro switch although I am not familiar with your model it really needs hands on.
Mark
Oldtimer Cameras do not have a Repair Manual for the ST 180, however, they do have a Repair Manual for the ST 600 which I believe is very much the same model, although there are some differences.
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