Question about Alesis M1-Active MkII Main / Stereo Speaker
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Posted on Jan 02, 2017
The flashing blue LED and loss of sound on the Alesis M1 powered
monitor is caused by failure of capacitor C8 (220uF, 35V) on the power
supply board. It dries up due to its proximity to resistor R4 (47K, 2
W) which gets very hot. This is a design fault.
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.
Posted on Nov 28, 2007
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