This is topic Sound problems Elmo ST 600 in forum 8mm Forum at 8mm Forum.

To visit this topic, use this URL:;f=1;t=010214

Posted by Brian Erikson (Member # 4960) on September 22, 2015, 03:36 AM:
Hi all , I need help for a elmo st 600
Track 2 records and plays back ok but it is muffled when I switch to track 1 and two, I can hear track 2 but low down
Track 1 wont record and playback just muffled sound
sometimes I can hear high piched sound from the movie
amongst the noise
sound meter works on both tracks when volume is high
any help welcomed
Posted by Maurice Leakey (Member # 916) on September 22, 2015, 04:19 AM:
The connections on the record switch may not be making good contact.
You could try to "clean" the connections by operating the record switch for a number of times. Make sure there is no film in the projector!
Posted by Brian Erikson (Member # 4960) on September 22, 2015, 05:43 AM:
Thanks Maurice I have already done this but no change
I will keep trying this process
Posted by Steve Klare (Member # 12) on September 22, 2015, 08:27 AM:
It still sounds like a standard-issue case of switch contact oxides, but there are more contacts than just the record switch. (This is a leader among the usual suspects, though.)

Try this:

Unplug the machine. Find every sound related switch you can find and switch it about a dozen times. (I'm big on the track select switch in this case. I had this same thing happen on my ST-1200HD)

Go to every sound jack you can find: plug and unplug the correct connector into and out of it a dozen times also.

Plug the machine in and try the sound again.
Posted by Martin Jones (Member # 1163) on September 22, 2015, 08:46 AM:
Muffled sound, low sound and inablity or difficulty in recording are classic symptoms of "dirty" heads. Cleaning with Isopropyl (or spit) usally clears this.
Posted by Brian Erikson (Member # 4960) on September 23, 2015, 01:56 AM:
Thanks steve
I will do as you said ,I thought it was the track switch
but wasn't sure ,thanks to all posts
will update soon
Posted by Brian Erikson (Member # 4960) on September 24, 2015, 03:53 AM:
I have removed the main circuit board and their is a smell
of burnt components .will check and see
Posted by Andrew Woodcock (Member # 3260) on September 24, 2015, 04:02 AM:
That's a good result Brian. At least now you have an idea where to start testing. Well done.

Visit for free equipment manual downloads. Copyright 2003-2019 Film-Tech Cinema Systems LLC

Powered by Infopop Corporation