Question about Alesis M1-Active MkII Main / Stereo Speaker

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Alesis 620 m1 active studio monitors sound cutting out

I recently got these amazing speakers but one of them is cutting out when I crank the volume. the gain is at 12:00 and the settings are at normal. speaker cables inside are connected properly so it cant be a loose cable maybe, can this be a power problem?

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It could be a power problem, unless you have blown the driver ?, carefully pull out the power supply board, and look to see if anything looks melted, burned, or capacitors popped etc. Be carefull though as I do not want to be responsible if you get an electric shock, etc. preferably look and dont touch, just use common sense ;)

Posted on Jun 02, 2009

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1 Answer

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1 Answer

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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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