Question about Alesis M1-Active MkII Main / Stereo Speaker

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M1 Active Mk2 blows fuse as soon as it's turned on., I bought them second hand so not under warranty. Anyone have any ideas if this is easy/expensive to fix or should I cut my losses and get a new pair ?

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Hi i have exactly the same problem with mine .. there is some yellow **** like glue splattered around some parts and it looks like its meant to be there.. however round the large black capacitors its turned a darker yellow with spots of orange in it.. also one of black capcitors also apears to be buldgeing out the top a little bit like its expanded.. i dont know if this is the problem?

do u have any idear on where we can take them to get fixed and if its going to cost a lot of money? i live in leicestershire uk

Posted on May 26, 2010

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It is related to the 1st problem which is similar a little.
But in this situation the real problem is the Amplifier IC which sent a high ampere
back to power supply and cut out the fuse.
The best thing to do bring it to repair shop to trouble shoot the power supply.
I suggest that because the a lot of parts or IC brand suited to this specification for
replacing the exact defective parts.


Posted on Nov 29, 2008

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Remove the power supply board (4 corner screws and 2 mains connector screws) and disconnect the two plugs. Carefully desolder C8 and replace it. Its value is not critical (220 to 470 uF will do) but it should be a 105 deg. type, preferably at 50V.

Remove R4 and replace it with a similar resistor with its leads bent so that it is nowhere near C8, otherwise the fault will return. One end may be connected to one of the existing R4 solder pads (furthest from rear of board), and the other to the top end of resistor R3. Check that you have connected it correctly by inspecting the PCB tracks.

Replace the board and all screws and plugs before testing.

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