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Author
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Topic: Super 8mm repair help
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Steve Klare
Film Guy
Posts: 7016
From: Long Island, NY, USA
Registered: Jun 2003
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posted October 18, 2018 09:13 AM
From what I am seeing the Sankyo 500 has an electronically regulated DC motor. This usually means there is a printed circuit board inside with two potentiometers on it, one for 18 FPS and one for 24.
The trick is knowing that they are the right ones and also which one is which. (I don't own one of these machines: I dunno!)
These can be interesting to adjust. The ones I've done have a pretty substantial lag in the speed: you adjust the speed to where it seems right and stop, but the speed keeps changing. You were too fast, but now you are too slow! If you aren't patient you can chase the speed all over the map: just do small adjustments, let it settle, do another smaller one and let it settle again.
The Elmo sounds like a bad internal connection or even worse a component in the sound circuit that's starting to fail. (It never hurts to try working the switches and jacks with the power off.)
The rewind can be either of two things. There is an adjustable clutch on the front spindle that may be giving up too easily. Also, there is this interesting mechanism on the rear spindle that's supposed to allow the long drive belt to disengage during rewind. If the belt is still moving during rewind, the extra drag can overwhelm the clutch on the front spindle.
This can become messed-up when you replace the belt: I know because I've messed it up a couple of times!
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All I ask is a wide screen and a projector to light her by...
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