8mm Forum: Sankyo 700 Speed Control Issue

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Topic: Sankyo 700 Speed Control Issue

Douglas Warren
Master Film Handler

Posts: 282
From: West Chester, OH, USA
Registered: Feb 2008

posted November 30, 2016 08:40 AM

I recently got (as a gift from my wife) a Sankyo Sound 700 Super-8 Projector. The issue I'm having is that it will run at normal speed (24 fps) for the first couple of minutes then start to slow down to a crawl. Could this be an issue with the speed control circuit? The motor seems strong and the belts in good condition, though the main belt between the pulleys might be a bit slack. Any thoughts,suggestions welcomed.

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Turn out the lights,the movie is starting!

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Phil Murat
Jedi Master Film Handler

Posts: 671
From: Villeneuve St Georges, France
Registered: Dec 2015

posted November 30, 2016 09:11 AM

Hi Douglas,

Here is what I suggest :

- Projector not powered, Hand rotate main shaft, it has to turn freely......(as necessary, put some drops of light oil on bearings or bushings, observe any changes)
Take this oppornuty to glance motors connectors (for loosen wires, conectors, etc....)

- Projector powered, monitor DC voltage on motor (Set multimeter for 50 V range approx)
Observe voltage for fluctuations when projector runs and record when slowing down.....

Let us know

Phil

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Douglas Warren
Master Film Handler

Posts: 282
From: West Chester, OH, USA
Registered: Feb 2008

posted November 30, 2016 09:58 AM

Thank you for the advice Phil and I'll give your suggestions a try.

--------------------
Turn out the lights,the movie is starting!

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