Re: Repairing Alesis M1 Active mk2 Monitor Speakers

OK,
Sorry for the delay, finally got some time to work on the board, everything apart from the C6 cap seemed fine. But I'm replacing the caps and R3 and R4.
Parts should come tomorrow or the day after, I'll post how it goes.

Anyone know what gauge wire I should use the replace the burnt out trace from C6 to R3?

Re: Repairing Alesis M1 Active mk2 Monitor Speakers

Ah Khron, you are an absolute legend, you have helped immensely.
I've picked up a few things since then and understand the circuit slightly better.

I'll pull the parts and do a few more tests before ordering replacements.
I'll post back my findings and how I get on, might be useful for others with the revision board. I also have a capacitance meter now.

Thanks for your help Khron!

Hi Khron,

Sorry to bothered you but I'm trying to fix an Alesis M1 active MK2 monitor and I have a few questions I thought you might be able to answer.
I've been looking over this thread and most of the information I've gotten has been from your posts, you also seemed to be familiar with the revision of the power supply.
I'm having trouble identifying a few components and wondered if you could help.

I made a post at the end of the thread with broader explanation.
[url]https://www.badcaps.net/forum/showthread.php?t=10910&page=8[/url]

...

Re: Repairing Alesis M1 Active mk2 Monitor Speakers

I forgot, some pictures.
Also is that big blob of hot glue they've put all over my diodes gonna be a problem? should I just replace them? I doubt I can get them out of the resin without destroying them. You can see it in the Board picture over Diodes 1-4...

Re: Repairing Alesis M1 Active mk2 Monitor Speakers

Hi all,

So far this thread has been a great help, thanks all!

So, after having not used my M1s for a while I turn them on and one gives out the most awful sound and I immediately turn them off. When I turn them on again there is a bang.
Opening it up its seems C6 had blown, taking with it the trace leading to R3. I removed it along with C7, R3, R4 and C16.
Through this thread I've discovered that my board is likely one of the revisions. The serial in the bottom right corner the PCB ends...