8mm Forum: Eumig 824 sound not working

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Topic: Eumig 824 sound not working

Luke Coiro
Junior
Posts: 12
From: Sydney, Australia
Registered: Dec 2008

posted November 14, 2012 07:35 AM

Not getting any sound with one of my two Eumig 824 projectors. I know it's not the speaker as I swapped over the covers between the two machines and I get sound with the one that works with either cover. Any ideas on what could be the problem?

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Martin Jones
Phenomenal Film Handler

Posts: 1269
From: Thetford , Norfolk,England
Registered: May 2008

posted November 14, 2012 09:02 AM

Only one piece of advice that can be given on this point as you have already exonerated the speaker and its external speaker socket by changing the backs.
You will find the Amplifier Fuse either on the sound panel nearest to the back (in a clip mounting) or on the connection panel of the large transformer (in a plastic tube mount, the end is a bayonet fit cover).
Try a replacement of the next higher milliamp rating; if everything is OK revert to the correct rating. If it still does not work, I would ONLY recommend consulting an EXPERIENCED audio technician as these amplifiers are not only difficult to get at but are also relatively "crude" in their design and construction (although brilliant in their performance when working properly !)and are difficult to work on. Enormous damage can be inflicted by a rouge soldering iron!
I am always filled with trepidation when I have to work on one of my Eumigs, despite having over 45 years of Audio Servicing experience.
Martin

--------------------
Retired TV Service Engineer
Ongoing interest in Telecine....

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Luke Coiro
Junior
Posts: 12
From: Sydney, Australia
Registered: Dec 2008

posted November 15, 2012 03:13 PM

Well I seemed to have fixed the sound problem. All I did was removed the fuse on the board and it checked ok with a multimeter. Then played around with the record button (pushed it in and out with no film running) and adjusted the two pins on the cover that make contact with the board. Put the cover back on, ran a film and the sound is now there. Thank god it wasn't anything major like the amp failing.

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Pasquale DAlessio
Film God

Posts: 3523
From: Bristol,RI, USA
Registered: May 2010

posted November 15, 2012 06:14 PM

Well done Luke!

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Janice Glesser
Film Goddess

Posts: 3468
From: Sunnyvale, CA USA
Registered: Sep 2011

posted November 15, 2012 08:24 PM

Glad it was something easy Luke!

--------------------
Janice

"I'm having a very good day!"
Richard Dreyfuss - Let It Ride (1989).

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Maurice Leakey
Film God

Posts: 5895
From: Bristol. United Kingdom
Registered: Oct 2007

posted November 16, 2012 02:39 AM

Luke
Do you mean the two spring contacts for the speaker connection?

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Maurice

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Luke Coiro
Junior
Posts: 12
From: Sydney, Australia
Registered: Dec 2008

posted November 16, 2012 04:02 AM

Yes the spring contacts. Don't think it was them as the cover worked when I swapped them around with my other machine. I think it had something to do with fiddling around with the record button.

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Paul Adsett
Film God

Posts: 5003
From: USA
Registered: Jun 2003

posted November 16, 2012 09:22 AM

I think the electronics on the Eumigs are extremely reliable, and I have never experienced any electronic problems in 40 years of owning many Eumig projectors. The circuit board design and construction quality is really excellent, with good spacing between components and circuit tracks, and trouble free soldering. Eumigs do not seem to suffer from cracked soldering and delamination of printed circuit boards that sometimes occur on Elmo's.
The 824 problem was almost certainly a dirty or corroded contact on the record button slider switch, which is located on the circuit board and connects to the red button via a wire cable. Just working the switch solved the problem, and a drop of switch cleaner will lubricate and clean the contacts and avoid any futher problems.

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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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