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Author 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      Profile for Douglas Warren     Send New Private Message       Edit/Delete Post 
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      Profile for Phil Murat   Email Phil Murat   Send New Private Message       Edit/Delete Post 
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      Profile for Douglas Warren     Send New Private Message       Edit/Delete Post 
Thank you for the advice Phil and I'll give your suggestions a try.

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Turn out the lights,the movie is starting!

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