Question about Bob Mackie Mackie M-1400i Power Amplifier Car Audio Amplifier

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Mackie 1200/1400 blows all 4 10 amp fuses

The outputs and resistors seem to be OK, fuses on 80 volt supply

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You have more than 1 blown transistor if youre blowing most of the +/- 80 DC fuses.
This is not any easy amp to fix. The entire unit has to come apart
to change transistors

If this helps at all rate my help , please

Thanks

Posted on Aug 25, 2009

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Missmatched impedance, insufficient ground, blown transistor.

Posted on Aug 05, 2009

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1 Answer

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i) I assume the fuse you mentioned was in the mains plug - did you also check the fuse in the TH15A mains input socket? This is accessed by pulling out the tab in the bottom section of the socket (below the centre pin). This is a 3.15Amp antisurge fuse, 20mm type.

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Hi.
It very unlikely the voltage went down. I think you should re measure what the voltage should be yes it 13 volt is after the bridge you wil get this with dual 6.5 volt ac from the transformer, they don't change voltage unless you have a short at the output, and if you did you will blow the transformer, is your reading from 2 wires or is it three wires, output, the center to the end should be 6.5 and end to end maybe 13.8.
I would need to see the schematic to know what voltage you should be getting.
I wouldn't look on a bat transformer but ether, bad bridge or wireing.

I hope this help's

What About Bob

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