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"Dead" right master channel on a console
Old 6th September 2011
  #1
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"Dead" right master channel on a console

I was given an old Studiomaster mixdown 16-8-16. Despite everything looking in order, the right channel appears to be dead. All I hear is a really tiny "ghost" signal.

I tried all possible outputs for the Right signal, and no luck. I tried different inputs panned to right, still no joy. When I set the defective channel on PFL, I get nothing.

I haven't touched anything yet. I really hope it's just the fader that's dirty, but I might be wrong.

Any suggestions on how to fix this?

Edit: When I solo a track, the track outputs in both speakers.
Old 7th September 2011
  #2
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Bump.
Old 7th September 2011
  #3
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SP2016's Avatar
Is there an insertion point in that right master channel ?
If so: check the switching contact of the connectors
Old 7th September 2011
  #4
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Hello.You may need to check the ribbon connectors in your Master section to see if they may have come loose ( unseated) also..Good luck..
Old 8th September 2011
  #5
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Update

OK, so i tried sending audio through the right channel insert, didnt work (it did work with the left channel though). Looked at the switch and it seems to be OK.

It appears that there's a piece at the back of the fader that's broken. That might explain why I still hear some "ghost" audio; it's as if the fader was all almost all the way down, some signal leaks through.

I've attached a couple pictures of the broken part.

So I'm wondering if I can just solder that in place or do I need another fader. I could always steal a fader from another channel if needed.
Attached Thumbnails
"Dead" right master channel on a console-dscn0124.jpg   "Dead" right master channel on a console-dscn0125.jpg  

Last edited by dechamplain; 8th September 2011 at 02:24 AM.. Reason: because I'm trying to make sense
Old 8th September 2011
  #6
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SP2016's Avatar
You will need a new fader.
These are carbon track faders and the piece that is broken makes the wire connection to the carbon track(s).
You cannot solder carbon.
Is there any marking on the fader ? Brand, type etc ?
Old 8th September 2011
  #7
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Quote:
Originally Posted by SP2016 View Post
You will need a new fader.
These are carbon track faders and the piece that is broken makes the wire connection to the carbon track(s).
You cannot solder carbon.
Is there any marking on the fader ? Brand, type etc ?
Here's the marking on the fader:

NOBLE 15A10K 8839.
Old 8th September 2011
  #8
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SP2016's Avatar
Quote:
Originally Posted by dechamplain View Post
Here's the marking on the fader:

NOBLE 15A10K 8839.
That is a low cost 10K audio taper, carbon track fader with 4.0" travel length.
8839 probably is the date of manufacturing: Week 39 in 1988.
It is not a very special fader. Also used in a lot of musical equipment.
There may be alternatives available, like the ALPS low profile N-type fader.
Not so long ago I ordered a couple of these at Canford Audio in the U.K. (order nr 58-267)


Also try Studio Electronics in Burbank California.
Old 9th September 2011
  #9
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Thank you very much SP. I just ordered a bunch of audio tapers (4$ each, so better have a few spares).
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