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I have 2 Mackie m2600 power amps that are both distorting on channel 2. Any possible hints as to what the probable cause is?
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Around that era Mackie had problems with ribbon cables in their amps & mixers, so as a first step you could try tugging/moving those while monitoring the amp for any changes. -
A few questions if you will.
Is the distortion at all power levels?
Were the amps run in bridge mode?
Is the Stereo Switch enabled?Comment
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They distort in both mono/bridge and stereo mode. Doesn't matter what level it's set at. Gonna put it back on the bench.Comment
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Low & high volume causes distortion?Comment
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Yes. It doesn't matter what volume I have it set at. But channel 1 is fine.Comment
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If it helps, someone has kindly made the service manual available at:
Mackie M2600 Service Manual free download,schematics,datasheets,eeprom bins,pcb,repair info for test equipment and electronicsComment
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Mackie M2600 Service Manual
The third file of that RAR download is corrupt.
Here is 1 & 2.Comment
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enjoy !
are the +/-15v supplies ok, if the distortion is at all volumes, the fault may be in the op amp input circuitry, also try with the limiter OFF, the problem could also be in the various fault detection circuits, im not sure if these are easilyComment
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and the rest of the filesComment
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K, thanks a bunch! I'll let you know what happens.Comment
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My brother gave me one of these with the same stated problem. Turns out, inductor L2 on the channel 2 board was open, not allowing q1,q5,q8, and q11 to turn on. 10 cent repair!!
Also recapped the supply and shes back alive and clean once again!
Thanks for the schematics MozwellComment
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