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Topic: Eumig RS3000
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Steve Klare
Film Guy
Posts: 7016
From: Long Island, NY, USA
Registered: Jun 2003
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posted March 12, 2015 03:25 PM
OK,
So what you have is internal hum, not an external ground loop. This can be the result of grounding problems inside the machine, or electrolytic power supply capacitors that have dried out and have fallen in value or magnetic pickup.
Pickup is the collision of two things that happen at once: one is the fact that we have this very sensitive sound head sensing this feeble little magnetic field on the stripe and sending it off to be amplified into sound, the second is we have this great big power transformer with a huge magnetic field that can't help but share a little with the sound head.
Eumig wasn't very shy about putting the transformer closer to the head than they should have, and particularly on the 800 series this is a big part of the hum problem. I don't know your machine as well, but the same people designed it.
Try this: if you are wearing a wedding ring, bring it close (not touching...) to the head and see if the hum changes in volume. (DON'T get married just so you can do this!)
This is a good thing to try first because it's easy and free.
By the way, is this a new problem, or just a "new" machine?
-------------------- 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
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posted March 16, 2015 12:27 PM
Well Steve, one of the things that I think is nice about the Eumig 900 stereo machines, is the fact that the electronics is all on one very neat board which is mounted by itself inside the base of the machine, totally separated from all the mechanical stuff. I don't know if that helps or hinders servicing electronic problems, but it certainly looks like a very neat electronic packaging design. Contrast that with the GS where the electronics are strung all around the machine on multiple boards and modules, all hooked together by wire harnesses and connectors.
-------------------- 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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