Electronics Repair Questions? Ask an Electronics Technician
Hi and welcome to Just answer.
Initially, if that is not constant it possibly the motor is faulty. The speed that must give the motor is possibly low or out of timing.
There is no mechanical adjustment on that case.
Hope this information will be helpful.
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The motor is variable speed , min. or max. does not change the feed problem. With film threaded completely through to the take up reel, the feed rack is reciprecating constantly but the film is not advancing constantly. It will feed a few frames, stop, then a few more. Like the fingers arent moving forward enough to catch the notches on the film...
I think the problem is the timing. check your chain belt if moves freely. If yes the motor is the primary suspect.
Try to check this link, CLICK HERE. You can get the parts of that projector or you can transfer the lens of your projector there to fix it.