8mm Forum: Eumig 820 Sonomatic No Sound

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Topic: Eumig 820 Sonomatic No Sound

Martin Dew
Expert Film Handler

Posts: 204
From: Henley-on-Thames, UK
Registered: Jan 2017

posted December 20, 2017 09:50 AM

I've just got hold of an Eumig 820 Sonomatic very cheaply and in excellent cosmetic condition, but there is no sound, and the 2A fuse on the amplifier board was blown on arrival. I tried another identical fuse 2A (5mm x 20mm), and it zapped immediately on turning on.

I've read as many threads as I can about similar issues on the forum, and realise there can be many causes.

However, are there any obvious or common visual physical signs I can look out for that might be causing the failure?

I will take the projector to John White in the New Year, but if there was a way to solve the problem and save a trip, any suggestions would be gratefully received!

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Maurice Leakey
Film God

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

posted December 20, 2017 10:59 AM

Probably a capacitor gone down in the amplifier.

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Maurice

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Paul Browning
Phenomenal Film Handler

Posts: 1006
From: West Midlands United Kingdom
Registered: Aug 2011

posted December 20, 2017 12:35 PM

Hi martin, does the rest of the machine work ok, or does the fuse shut down the projector completely?. I have had both these on different projectors, as Maurice says a shorted cap will take out the fuse, but so will an amplifier transistor, which will draw this kind of current on switch on.

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Steve Klare
Film Guy

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

posted December 20, 2017 12:48 PM

The problem with something like this is there could be so many possibilities.

-another good one is the rectifier right where the AC power comes in from the transformer. These commonly short after cooking for a couple of decades.

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

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Martin Dew
Expert Film Handler

Posts: 204
From: Henley-on-Thames, UK
Registered: Jan 2017

posted December 20, 2017 01:01 PM

Yes, projector is actually running very well and quietly.

Okay, if it's a cap or transistor or rectifier, I'll have to wait to see Mr. White. I wondered if it might be a common simpler issue, but clearly not.

Thanks to all of you...

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