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Mackie 450, signal light off, Sound only comes out when amp. turned up above 75%, when usually used at 40-50%. too loud at 75% and UP, does not Work at ALL below 75%. only 2 years old, with 25 uses... i must have unplugged it while it was still on! is this a Simple problem?? just a fuse?

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Hi,

If the receiver uses a rotary type volume control then it is a problem with the carbon pads inside. A simple temporary workaround is to spray the insides of the volume control with electronic contact cleaner. Of course best would be to replace it. This is not a critical job and would only require basic knowledge of soldering.and nearby electronics parts store. Pls note down which wire go to which pin/terminal.before removing the old volume control.

Hope this be of initial help/idea. Pls post back how things turned up or should you need additional information.

Good luck and kind regards.

Thank you for using FixYa.

Posted on Mar 14, 2008

  • Louie  Role
    Louie Role Mar 14, 2008

    Hi MrSoundman7,

    Guess we're on the same track. Cheers.

  • Louie  Role
    Louie Role Mar 20, 2008

    Hi again,



    Any developments with your concern?

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  • 142 Answers

Doesn't sound like a fuse. They don't fix themselves when you reach 75%.

Try shaking the volume knob while in the 30-50% range and/or try (with the power off) rotating the volume knob numerous times from 0% to 100%. If when you plug it back in it responds ANY differently, you might have a bad volume potentiometer. If when you shake the knob you hear static or intermittent sound, you have a bad volume pot.

The only other thing I can think of is that the wiper of the volume pot is not in contact with the windings inside the pot until you reach the 75% mark. When the volume comes on at 75%, does it start off kind of "static" then come in loud and clear? Also try this.... adjust the volume pot to 74% (or when the sound just begins to come on). At this point shake the knob. If you hear static, replace the volume pot.

Unplugging it when still on shouldn't cause any damage... in fact it probably hasn't considering it works at 75% plus.

Posted on Mar 14, 2008

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