8mm Forum: Eumig Mark S709

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Topic: Eumig Mark S709

Lee Bombard
Expert Film Handler

Posts: 139
From: Santa Clarita, CA, USA
Registered: May 2013

posted June 30, 2013 12:11 PM

I'm trying to get a Eumig Mark S709 up and running and it's in terrific condition in all regards except the audio plays back sounding like a boat motor...
Before I have it serviced by a tech any thoughts on anything I might try first to troubleshoot?
Thanks!

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Lee Bombard
Expert Film Handler

Posts: 139
From: Santa Clarita, CA, USA
Registered: May 2013

posted June 30, 2013 07:48 PM

Looks like the 709 needs a replacement sound head.
Anyone have one for sale?

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Mike McCord
Film Handler

Posts: 36
From: Birmingham, AL, USA
Registered: Jun 2013

posted July 01, 2013 08:01 AM

If the "motor-boating" sound (hum) is adjustable with the volume control, it is most probably in the direction of a bad sound head.
If the hum is not reduced by the volume control, then look in the direction of bad power supply filter capacitors. This is an old/common problem in the day of radios and TV's built with vacuum tubes.
PM me for more troubleshooting assistance...

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Lee Mannering
Film God

Posts: 3216
From: The Projection Box
Registered: Nov 2006

posted July 01, 2013 08:20 AM

Hi Lee. It could be that the sound pressure pad/pinch roller rocker is not free on its shaft. I had this as they tend to oxidise with age. Check that it is moving freely and smoothly when you turn the control knob for sound. Also well worth cleaning the black rubber pinch roller and silver capstan as you at it.

Check 1 is moving freely on its mounting shaft and 2 goes up and down.

Clean 3 with Isopropyl (audio head cleaner) on a cotton bud and also the metal capstain above it by rotating.

Underneath 2 the black swinging mount you will see some other metalwork which also needs to move freely.

Hope this helps.

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Lee Bombard
Expert Film Handler

Posts: 139
From: Santa Clarita, CA, USA
Registered: May 2013

posted July 01, 2013 02:32 PM

Lee - All the points you illustrating seem to be acting as they should. Can I assume that points to a bad sound head?

Mike - Sent you a PM.

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