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My Mackie SRM450 appears to have a faulty volume pot. I have to tweek it in both directions several times and then it may come on but it's not reliable. I can relace the part myself but am unable to seperate the heatsink from the cct board. Any hints...??

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Inside the amp, on the back side of the circuit board is a tony Black Plastic "Jumper" with a "pull tab" on it.
If the pins have lost their 'straightness' from dropping the speaker or rolling it around in the van, the Jumper may be intermittently making contact.
Of course when full voltage is applied via the volume knob, there is enough to "connect" the jumper sleeve temporarily.
When you turn the volume back down, this repeates the cycle.
All you need to do, is remove the entire amp panel on the back, locate the "Jumper" (near the Volume Pot on the circuit board), straighten the pins, "clean" and inspect the jumper for "loose contacts" (very tiny parts in there!), and make sure it re-seats firmly.
This should solve the problem. If not, I would investigate a crack in the circuit board, etc...

Posted on Nov 19, 2009

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It may be just dirt. Try spraying it with either Super Servisol Switch Cleaner or Servisol Video 40.
Both can be found at Radio Shack (USA) or Maplin (UK).

Posted on Oct 07, 2009

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1 TAKE THE MAINS PLUG OUT
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