DIY Audio Projects Forum

Alesis M1 Active 620 Repair
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Author:  conradel [ 09 Nov 2012, 12:21 ]
Post subject:  Alesis M1 Active 620 Repair


Im not too sure whether this is the suitable place for queries like this, so sorry if not but incase anyone would be kind enough to help anyway!

Monitors are roughly 3 years old.

Upon switching on one of the monitors a dull popping noise sounded from within the unit. and smoke came out of the bass air inlet hole. and it smelt like burning a little.

The monitor then did not switch on.

To see whether it was possibly a faulty plug that caused this i used the kettle lead from the unit that had just 'blown' on my other M1 Active 620 Studio Reference Monitor. This caused it to stop working also but without any pop or smoke/smell like the first speaker had.

I have opened both units up to see if i could solve the issue (hoped could have possibly been a blown fuse, which i have ruled out through testing both fuses with a multimeter, and both seeming fine)

on the first unit that broke (with the smoke and smell) i found a blackened area on the circuit board* see pictures

Inside the other i can see no obvious problems.

Hope to hear from you soon as to what can be done to fix my monitors.

Thank you


Author:  conradel [ 12 Nov 2012, 05:43 ]
Post subject:  Re: Alesis M1 Active 620 Repair

Anyone got any idea as to what may have happened here?

Just re-checked the pictures and they might not be all that clear, the 'blackened area is above the 2nd black cylinder...

any help here would be fantastico, thanks allot in advance

Author:  Gio [ 14 Nov 2012, 23:20 ]
Post subject:  Re: Alesis M1 Active 620 Repair

The photo is not all that clear, but I will guess likely the cap. Have the burns damaged the PCB traces?


Author:  conradel [ 15 Nov 2012, 11:25 ]
Post subject:  Re: Alesis M1 Active 620 Repair

Hi Gio, thanks for your response. are PCB traces the lines on the circuit board? If so, yes i think the burns may be going over them. although i do not have the unit in front of me now to confirm that. I will try and get some clearer pictures up tomorrow :) thanks again

Author:  turk 182 [ 01 Dec 2012, 00:38 ]
Post subject:  Re: Alesis M1 Active 620 Repair

after looking at your pics i'd venture a guess that one of the voltage regulators on that aluminum heatsink has given up the ghost(magic white smoke) take a closer look at the one closest your burn mark to see if you can spot a burn hole or a crack in the die casing on that device

Author:  pmook [ 03 Jan 2018, 10:31 ]
Post subject:  Re: Alesis M1 Active 620 Repair

Exact same thing just happened to me this week lol... Sorry for the necromancer post. Any updates?

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