Hello, I am stumped with a bit of a problem. The ClearCom system that
is installed at the concert hall I work at has been developing a
temper lately. Ever since last year it has had a buzz in it. Well,
it's not specifically a buzz, it's a combo of a hum, buzz, and static.
Last year, if you were to plug in a belt pack at various ClearCom
jacks around the hall, a short would occur and the call light would
lock on on every receiver (PS. they are all in series). If you
unplugged that pack, then everything would go back to normal. Well,
this year, it's my board that is causing the problem. I am using a
Mackie SR40-8. Last year my board didn't cause any problems, but I
came back in the fall and it was doing it. The only thing that I can
think of is to take a multi-meter and go down the series and probe
each jack to see when a voltage change occurs. Does that seem like a
possible plan or is it a crap plan. I'm honestly shooting in the dark
here. Please help me out.
-Luther

Luther Bell wrote:
Hello, I am stumped with a bit of a problem. The ClearCom system that
is installed at the concert hall I work at has been developing a
temper lately. Ever since last year it has had a buzz in it. Well,
it's not specifically a buzz, it's a combo of a hum, buzz, and static.
Last year, if you were to plug in a belt pack at various ClearCom
jacks around the hall, a short would occur and the call light would
lock on on every receiver (PS. they are all in series). If you
unplugged that pack, then everything would go back to normal. Well,
this year, it's my board that is causing the problem. I am using a
Mackie SR40-8. Last year my board didn't cause any problems, but I
came back in the fall and it was doing it. The only thing that I can
think of is to take a multi-meter and go down the series and probe
each jack to see when a voltage change occurs. Does that seem like a
possible plan or is it a crap plan. I'm honestly shooting in the dark
here. Please help me out.
-Luther

Have you considered the possibility you have a BAD cable on the belt
pack that is then shorting out the line? If its a single channel unit,
it should be a standard 3 pin XLR. The dual channel units are a
*******ized 4 or 5 pin. You have 24 volts DC or so on one pin of the
line. If that voltage drops after plugging in the pack, you have a
problem. Most clearcom supplies will shut down and go into current limit
if there is a direct short on the line for more than a second or so.
Its better NOT to hot plug the packs. Plug in all the packs then turn
the power supply on. Any pack will make a thump when plugging it in.
Or screech in your ear if you unplug it with your headphones still on.

If your wiring is all in parallel in a series string , you might need to
take each wall plate off and check for proper soldering or any wires
shorting together or to ground.

Bob


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