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Dead channel strips
Old 1 week ago
  #1
Here for the gear
 

Dead channel strips

Does anyone know how to go about troubleshooting a channel strip on a powered mixer?
Channels 4 and 5 don’t work. One of them was intermittent and now they don’t work at all. I don’t see anything obvious in any of the components. Channel 1 XLR input completely broke off and that’s an easy fix. This unit is an oldie but still puts out good power so I’d like to fix it to make it sellable.
Model: V-200PH

Thanks in advance.
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Old 1 week ago
  #2
Gear Maniac
 

If one input connector has already broken off, I'm going to guess that the whole thing has had a hard life. An intermittent often means there is a broken trace or solder joint somewhere. A magnifying glass can be helpful for finding those.

Another technique is to apply a signal with it powered up and gently flex the circuit board. You might find the fault(s) that way, but working on powered up gear is not something for the neophyte to try right off the bat. You need to know what you're doing and take appropriate precautions for your personal safety.

If you have a scope, applying a signal to a working and non-working channel at the same time and then comparing them might work too. You should get identical waveforms as you move from input to output on the two channels, until you get to the failed component (or PC trace).

Good luck. Be Careful!

Geoff
Old 6 days ago
  #3
if you are handy with a multi-meter, you can check the resistance (while powered off and unplugged) across a solder trace. if it's 0Ohms, then everything is fine. if it's OL (overload), then you have an opening in the trace which means something is broken.

beyond that, i'd take it to your local TV/stereo/amp repair shop.
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