8mm Forum: Keystone 109D Motor issue?

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Topic: Keystone 109D Motor issue?

Chris Smart
Junior
Posts: 30
From: Toronto, Canada
Registered: Jul 2019

posted August 26, 2019 08:44 PM

Hi everyone, I need some help! My projector has been running fine up until tonight when it started fluctuating in speed. It happened while watching a film, it slowly came to a stop near the end of the reel. I usually run films at half speed and thought it might be caused by a warped reel and the film getting caught on the sides. I turned the dial to a higher speed and it started moving again but now when I run it without film I can hear fluctuations in its speed and if I reduce the speed it sometimes crawls to a stop.

Is this an issue with the motor or does it need to be greased?

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csmart

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Chris Smart
Junior
Posts: 30
From: Toronto, Canada
Registered: Jul 2019

posted August 27, 2019 10:12 PM

Does anyone have experience taking apart these projectors? I'm trying to access the gears connected to the motor.

Thanks

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csmart

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Nantawat Kittiwarakul
Master Film Handler

Posts: 280
From: Rajburana, Bangkok, Thailand
Registered: Aug 2017

posted August 28, 2019 05:32 AM

Not specifically to this projector but...

My general rule in such a case is to isolate the cause first. Is it mechanical or electrical problem? If you can somehow disengage the drive motor from the mechanic that will be much easier.

If the motor runs fine when disengaged, then check for sticky mechanism.
If the motor runs slow even with no load, check the motor itself.

Recently spent a few nights trying to bring back this beast from death (it sometime runs for a few second, then back to death). After nights spent without progress and I'm about to give up. I then noticed gunk/goo INSIDE the drive motor (around the armature). A total disassembly+clean up+lubrication+reassembly, and it's back to life again. [Big Grin]

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Just a lone collector from a faraway land...

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Chris Smart
Junior
Posts: 30
From: Toronto, Canada
Registered: Jul 2019

posted August 28, 2019 06:14 AM

Thank you Nantawat for the reply! I have hit a snag (literally) while disassembling the casing around the motor. My problem is that I cannot disassemble it for further inspection. I have removed all visible screws that retain the motor and it's housing and shields but it seems to be obstructed in the area of the motor and the belt or gearbox?. Inadequate movement of the loosened covers prevent observing just what is holding it. The loosened cover moves perhaps 1/4 in all directions but no more. I don't want to force it and damage the belt or something else. The motor casing has been misaligned so much now I strongly suspect a full disassembly will have to be completed before I can get it back together.

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csmart

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Chris Smart
Junior
Posts: 30
From: Toronto, Canada
Registered: Jul 2019

posted August 29, 2019 07:11 AM

Can anyone recommend a safe way to remove a belt around a motor safely without damaging it?

I have kept the screw in place on the casing (top of picture) to prevent the weight of the motor from pulling on the belt. I need the belt removed to get access to all the gears.

Thanks!

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csmart

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Nantawat Kittiwarakul
Master Film Handler

Posts: 280
From: Rajburana, Bangkok, Thailand
Registered: Aug 2017

posted August 29, 2019 10:38 PM

Not sure...but if you can somehow "slip" the belt out of the pulley - literally disengaging the motor from the rest of the mechanic, that would be enough for inspection.
With the belt disengaged, can you turn the projector easily with your hand? How does the motor behave without the load?

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Just a lone collector from a faraway land...

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Chris Smart
Junior
Posts: 30
From: Toronto, Canada
Registered: Jul 2019

posted September 04, 2019 09:30 AM

Thank you Nantawat. I decided to play it safe and bring it to a local camera repair specialist who can also repair projectors. I didn't want to chance damaging the belt.

Thanks for your help!

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csmart

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