8mm Forum: Eumig S810D

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Posted by Tim Murray (Member # 4555) on December 04, 2014, 03:21 PM:

Hi I have a Eumig S810D and had a couple of questions:
What is the quickest and easiest way to clean the sound heads
Does anyone have a speaker hum filter for sale

Any responses gratefully received.
Thanks

Posted by Martin Jones (Member # 1163) on December 04, 2014, 04:05 PM:

There is unfortunately no hum filter that you can fit in the speaker lead to remove hum. A firm named Craven used to make one.... but it was worse than useless.
Martin

Posted by John Last (Member # 3414) on January 03, 2015, 08:24 AM:

Tim, There should be no hum once the film is on the head. There will be hum if no film is in the projector and the volume is turned up. I believe that the sound head is directly underneath the lamp in the 810 and should be quite simple to remove to clean it. Pity you don't live nearer, we could sort it out then!

Posted by Steve Klare (Member # 12) on January 03, 2015, 11:41 AM:

Hum is a fact of life where audio circuits are concerned. Even the best of the best have a tiny amount that you have to measure electrically because it's too low to perceive. It's just one of those things that you get good enough and call it a day.

There are a lot of good things about the Eumig 800 series machines, but hum immunity is not their biggest strength. There are all sorts of stories about tweaking out the hum on these here.

Paul Adsett provided a procedure for cleaning Eumig 800 series heads. Method 2 down below is actually easier than it sounds and I've done it a few times myself. It's what I'd recommend.

quote:
Cleaning the Sound Head:

METHOD 1: (for a quick clean). The sound head is located right underneath the Bulb. It has a white cable coming out of it, which plugs into a receptacle on the chassis. For a real quick clean, take a can of air duster and blast air down into the Teflon film chute at the front of the sound head assembly. This will blow out any loose oxide particles in the sound head. This process is recommended after every couple of reels, to keep oxide from building up inside the head assembly.

METHOD 2: ( FOR A THOROUGH CLEAN, THIS PROCEDURE TAKES ABOUT 30 MINUTES, AND REQUIRES DISSASSEMBLY OF THE SOUND HEAD).
1. Set the control knob to the Forward position then pull off the black control knob at the side of the projector. Remove the lamp housing cover.
2. Pull off the volume control knob and the mixing control knob.
3. Undo the screw located between the volume control knob and the mixing knob, and pull the side panel forward and out to expose the inside of the projector.
4. Unplug the sound head, then undo the single screw which bolts the sound head to the chassis wall.
5. Remove the sound head.
6. Look at the sound head. There are a total of 6 screws in view. Do NOT touch the four innermost screws, they are used for the critical elevation and azimuth alignment of the sound head to the magnetic tracks on the film. Undo the 2 outer screws to remove only the MU-METAL magnetic shield, and the pressure pad assembly. You now have total access to the heads and pressure pads for a thorough cleaning with alcohol. Be very gentle in wiping the head areas. You may wish to de-magnetize the heads while you are at it, using a Radio Shack tape- head demagnetizing probe. Also polish the film channel and pressure pads with Pledge or Favor furniture polish.
7. After cleaning, reassemble the mu-metal shield and pressure pad assembly to the head, and tighten down the 2 outermost screws.
8. Align locating hole on the sound head with the pin in the chassis, and bolt back into place with the single screw. Plug the sound head back into the wall connector.
9. Reassemble the side panel, audio knobs, and Main control knob. Return the control knob to the OFF position

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