8mm Forum: GS1200 noise in the speaker

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Topic: GS1200 noise in the speaker

Antoine Orsero
Master Film Handler

Posts: 374
From: marseille france
Registered: Jun 2003

posted January 12, 2010 03:45 AM

Hi,

In recent days, on my GS1200, when I turn on the projection lamp, I hear the motor noise in the loudspeaker.
What do you think?

Regards

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Tony

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Kevin Faulkner
Film God

Posts: 4071
From: Essex UK
Registered: Jun 2003

posted January 12, 2010 08:34 AM

It could be one of two possibilites. When the lamp is turned on the cooling fan speed is increased. It could be the carbon brushes arcing in the motor.
The other thing which could be causing the trouble is the relay which switches the lamp. This could have arcing contacts.

Kev.

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GS1200 Xenon with Elmo 1.0...great combo along with a 16-CL Xenon for that super bright white light.

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Antoine Orsero
Master Film Handler

Posts: 374
From: marseille france
Registered: Jun 2003

posted January 12, 2010 10:24 AM

Thank you very much Kevin!

I'll watch!

I note that the noise stops after a few minutes!

--------------------
Tony

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Steve Klare
Film Guy

Posts: 7016
From: Long Island, NY, USA
Registered: Jun 2003

posted January 12, 2010 10:52 AM

Hi Antoine,

I had a problem with motor noise in the speaker of one of my projectors a few weeks ago. I believe it was arcing due to worn motor brushes because I was able to also hear it on my son's walkie talkie, and when the noise on the walkie talkie went away, so did the noise through the projector's speaker.

Any AM radio will do the job.

The thing that really closed the case for me was since it was the main motor that was arcing, I was able to change the pitch of the noise by changing frame rate. With a fan, you don't have that luxury. (Although, I would imagine the frequency of a fan motor arcing would be a lot more steady than a relay breaking over.)

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All I ask is a wide screen and a projector to light her by...

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Paul Adsett
Film God

Posts: 5003
From: USA
Registered: Jun 2003

posted January 12, 2010 10:56 AM

I get a crackling noise in my GS1200 internal speakers when rewinding the film, but it is fine during projection. No idea what causes that, but it probably is brush noise in the rewind motor.

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The best of all worlds- 8mm, super 8mm, 9.5mm, and HD Digital Projection,
Elmo GS1200 f1.0 2-blade
Eumig S938 Stereo f1.0 Ektar
Panasonic PT-AE4000U digital pj

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Antoine Orsero
Master Film Handler

Posts: 374
From: marseille france
Registered: Jun 2003

posted January 12, 2010 11:07 AM

I injected Contact Cleaner in visible holes of the fan motor where there is coal and the noise is now gone!

I have coals alternative but must leave the engine to replace them and this is no small matter

--------------------
Tony

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