This is topic GS1200 noise in the speaker in forum 8mm Forum at 8mm Forum.


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Posted by Antoine Orsero (Member # 41) on 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
 
Posted by Kevin Faulkner (Member # 6) on 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.
 
Posted by Antoine Orsero (Member # 41) on January 12, 2010, 10:24 AM:
 
Thank you very much Kevin!

I'll watch!

I note that the noise stops after a few minutes!
 
Posted by Steve Klare (Member # 12) on 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.)
 
Posted by Paul Adsett (Member # 25) on 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.
 
Posted by Antoine Orsero (Member # 41) on 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
 


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