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Church and H.O.W. – Forums for HOW Sound and AV - Your Displayed Name Must Be Your Real Full Name To Post In The Church and HOW Forums => Church Sound => Topic started by: Jeremywhit on January 27, 2018, 07:24:06 PM
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I am trying to troubleshoot an intermittent problem with an Yamaha emx5000 powered 20 channel mixer. Sometimes after power up, the main speakers will not work unless someone taps on a mic... any mic. The monitors will work just fine and the signal also gets to the headphones. Once you tap on a mic or give the board a large input signal it seems operate just fine. I think it has "shut down" if the board was not used for a while but still powered on. To my knowledge it does not have a noise gate or something along that line (or at least one that a user is able to adjust). Its a fairly basic board.
This is very annoying to say the least to start out the church service with a loud pop, not to mention we are a small church and rely on not so knowledgeable volunteers to help run sound. Please help with any suggestions, I'm not even sure where I can go for repair as we are on a very limited budget.
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I am trying to troubleshoot an intermittent problem with an Yamaha emx5000 powered 20 channel mixer. Sometimes after power up, the main speakers will not work unless someone taps on a mic... any mic. The monitors will work just fine and the signal also gets to the headphones. Once you tap on a mic or give the board a large input signal it seems operate just fine. I think it has "shut down" if the board was not used for a while but still powered on. To my knowledge it does not have a noise gate or something along that line (or at least one that a user is able to adjust). Its a fairly basic board.
This is very annoying to say the least to start out the church service with a loud pop, not to mention we are a small church and rely on not so knowledgeable volunteers to help run sound. Please help with any suggestions, I'm not even sure where I can go for repair as we are on a very limited budget.
My first question is how old is the board?
My "guess" from looking at the block diagram is that the protective relay is at fault. Depending on age and use, the contacts could have some corrosion. If you can open it up, depending on the kind of relay, you could remove the cover and buff the contacts. Again, just a "guess".
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Perhaps a dirty insert jack, or dirty switch...
JR
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Perhaps a dirty insert jack, or dirty switch...
JR
Or bad solder joint.
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That is the classic sign of a slightly oxidized set of contacts somewhere in the signal path. The relay that David mentioned could very well be the problem.
The power amp input jacks most likely have pass through contacts in them, those could be the issue, with it turned off take a plug and insert it a few times in each of those jacks. Better yet get some contact cleaner and a small brush to clean the jack with....power unplugged.
Move the power amp selector switches back and forth a few times.
Are you using the Speakon or 1/4 inch speaker connections
Have you tried cleaning and re seating the speaker cable plugs, even more so if you use the 1/4 jacks.
It could still be a circuit board level problem but my guess is that it's an oxidized contact somewhere.
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Thank you very much I will try these suggestions
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Thank you very much I will try these suggestions
Just make sure to unplug it first! 8)
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Maybe there is a gate somewhere. Either in outboard processing, or DSP etc.