Question about Behringer XENYX 2442FX Mixer

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Mixer Switch on and after a short period theres a noise that sound like a machinegun and a Hiss sound through the speakers

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I assume that the power-amp is good.
This noise, of course due to defective parts inside.
But, which section is it? Chances are:

  • Amplifier circuit in the Main-Outputs. If the MAIN MIX in the minimum position and still noisy, then the damage in that section.
  • At one or several channels. Let's test.
    Set to minimum volume for all channels and MAIN MIX. EQ=flat. FX=minimum. TRIM at half (let's try at 12 o'clock).
    Raise the MAIN MIX, let's say at 15.
    Gently, raise channel 1 volume to maximum, listen, if there is no noise, channel 1 is safe. Lower the volume to the minimum again. Move to another channel in the same way.
    If found noise, that is where the problem is.
Actually, many more detailed steps for testing, but the description is too long. This above is a simple way.
Circuit power supply should also be checked, whether all normal voltage.

Mixer Switch on and after    a short period theres - mixer-switch-after-short-period-theres-imlh0v44wkwtg1kaqtxpxnrr-2-0.jpg



It is part of the image of the amplifier section circuit.
Parts which may be broken is the IC 64,65,77.

Posted on Sep 15, 2015

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Posted on Jan 02, 2017

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1 Answer

Hiss


If trim controls or gains are set near maximum, HISS is normal as electronics generates a thermal type noise.

If gains are set in normal operating area, the noise SHOULD be minimal.

Other sources of interference like nearby radio transmitters, welders, arc lights, etc. can create noise.

Start with ALL gains turned down and find which if any cause the noise to be unacceptable.

MAKE SURE all power to this and ALL the other connected equipment come from a single receptacle to avoid ground loops.

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