volume knobs not working - AVS Forum
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Old 07-03-2014, 05:58 AM - Thread Starter
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Question volume knobs not working

Just a warning, I'm an audio noobs and did not install anything myself!

My old home had an [Audioplex MJ-1 distribution hub](http://www.audioplex.com/MJSeries.htm) in the basement that made the whole house act as a single zone which I just connected an old speaker [Midiland S4-8200](http://www.anandtech.com/show/527)

I connected the 'input' to the L/R output on the sub and then an apple TV to the control box of the speakers. Everything just 'worked' and we had a poor man's single zone sonos with functioning volume knobs in each room, yay

Here is a picture of the dist hub, http://i.imgur.com/Lz8qMpP.jpg, looks like it has 'protection' set to out.

New home is similar setup of house speakers, only the speaker wires come in to media cabinet on first floor and there is no distribution hub, just every rooms wires all coming out loose.

So I took a random pair (turned out to be bedroom) and hooked it up to the Midiland again. Sound came out but I could not control the volume at the knobs. I tried other sets and similarly I could not control volume in the room at the knob, so I took them out to have a look (I did not do this at previous home so I dont know what I had there)

Most are set to 8x but the 2 knobs for the outdoor speakers were set to 1x and looked burned/melted? Here are some pics http://imgur.com/a/F1T24#0

I'm assuming this is bad..

What should I do so it doesn't melt and how do I get working volume at the knob again?

Is there a decent distribution hub I can use until I can afford a proper setup for zones, the MJ-1 said discontinued

Is there anything else I can provide to help figure this out?
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Old 07-03-2014, 11:54 AM
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Use contact spray for electronics, this worked to get the knob on my velodyne f1200 working again.
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Old 07-04-2014, 11:03 AM - Thread Starter
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Originally Posted by kpotier16 View Post
Use contact spray for electronics, this worked to get the knob on my velodyne f1200 working again.
where do I spray?

Also are those boards with the dark marks fried or safe to use?
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Old 07-04-2014, 08:08 PM
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Originally Posted by gifpaste View Post
where do I spray?

Also are those boards with the dark marks fried or safe to use?
Sorry to be the one to bring you the bad news
It look fried from the picture

That would explain your problem
I am not an electronic teck, but you can definatly see something did melt down

Ray

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Old 07-05-2014, 04:55 AM - Thread Starter
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Originally Posted by darthray View Post
Sorry to be the one to bring you the bad news
It look fried from the picture

That would explain your problem
I am not an electronic teck, but you can definatly see something did melt down

Ray
Would that cause all the other volume knobs to equally not work?
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Old 07-05-2014, 07:53 AM
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Originally Posted by gifpaste View Post
Would that cause all the other volume knobs to equally not work?
I would say Yes.

Personally I would remove this piece of equipement or replace-it!
Your home is more Important than a piece of audio gear in case it might induce a fire (un-likely, but better be safe than sorry).

Yes this will set you back, but over time the money will be forgeten and you know that you and Love one are safe!

Thing like this, might cost just as much to fix than replace.
I personally think there was a short somewhere to cause this and you should investigate what is the cause before replace-it.

Ray

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Old 07-06-2014, 07:26 AM - Thread Starter
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I personally think there was a short somewhere to cause this and you should investigate what is the cause before replace-it.

Ray
Thanks for all of your help. I agree replacing is a pittance compared to value of home.

Is there a good method or tool to test for a short?
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Old 07-06-2014, 08:07 AM
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Thanks for all of your help. I agree replacing is a pittance compared to value of home.

Is there a good method or tool to test for a short?
I cannot be of any help on this on.
It could have been as simple, as 2 speaker wire touching each other even if it was only 1 strand or it could have been something else.

But I would definatly say that the board look fried to me.

Since the unit need to be replace!
What I would do is;
move that speaker wiring to another zone
if it frys the other the zone, than you have elimated all others

Disclaimer!!!
If you do this, stay near the unit with a proper fire extinguisher and look for anything not normal and smell the unit for any sign!

Hopefully other can chime in on better way than my caveman testing.

Ray

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