Re: Repairing Alesis M1 Active mk2 Monitor Speakers
Hi all!
Inherited a set of these speakers from an old housemate who ran away to avoid paying rent. I'm a musician and haven't looked at a circuit board since A Level Physics ten years ago.
They worked for a while, but then one dropped out, and then the other. Now neither of them turn on at all (no light, no sound).
Figured it's finally time to get round to repairing them, but the main thing I've noticed is that the common issue (C8 proximity to resistors) is not possible on this board.
I don't know if these speakers are a more recent production than the ones commonly described in the guides here and on Youtube... I read through this whole thread and am still totally unsure.
On my board, C8 and the little blue C14 have swapped places.
So, C8 is between U1 and R24, and C14 is next to R3 and R4.
There is also only one little C14, instead of two like on this video: https://www.youtube.com/watch?v=ThjO7vlb79E
I have no idea what process I should be undertaking to fix the speakers then, as the video guides now seem inappropriate due to it being a different board!
I don't really know what to look for in terms of 'signs of damage' or anything. The big black power cylinders all seem to have flat tops (one is dubious, but more flat than warped).
Guessing I should start with the fuses? I can say with certainty that one of the fuse 'beds' needs replacing (the metal clips that hold the fuse in place are broken).
Thanks for any help, I hope you can excuse my extreme lack of knowledge!
Hi all!
Inherited a set of these speakers from an old housemate who ran away to avoid paying rent. I'm a musician and haven't looked at a circuit board since A Level Physics ten years ago.
They worked for a while, but then one dropped out, and then the other. Now neither of them turn on at all (no light, no sound).
Figured it's finally time to get round to repairing them, but the main thing I've noticed is that the common issue (C8 proximity to resistors) is not possible on this board.
I don't know if these speakers are a more recent production than the ones commonly described in the guides here and on Youtube... I read through this whole thread and am still totally unsure.
On my board, C8 and the little blue C14 have swapped places.
So, C8 is between U1 and R24, and C14 is next to R3 and R4.
There is also only one little C14, instead of two like on this video: https://www.youtube.com/watch?v=ThjO7vlb79E
I have no idea what process I should be undertaking to fix the speakers then, as the video guides now seem inappropriate due to it being a different board!
I don't really know what to look for in terms of 'signs of damage' or anything. The big black power cylinders all seem to have flat tops (one is dubious, but more flat than warped).
Guessing I should start with the fuses? I can say with certainty that one of the fuse 'beds' needs replacing (the metal clips that hold the fuse in place are broken).
Thanks for any help, I hope you can excuse my extreme lack of knowledge!
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