Re: Repairing Alesis M1 Active mk2 Monitor Speakers

Apparently hot enough to cook the cap.

Re: Repairing Alesis M1 Active mk2 Monitor Speakers

C7 was a typo, I meant C6 (but can't edit). You're right that R4 isn't paralleling C7, however... once it does startup, It's only 15v or so short of the divider I was describing, and R3/R4 still have about 145v across 47k. I don't see anything about how much current the kick starter needs to operate - just "low". I don't know if upping those resistors to lower heat dissipated right there would prevent it from starting up. If it just has to kick the gate driver over once it shouldn't take much at all. It can't really be...

Re: Repairing Alesis M1 Active mk2 Monitor Speakers

C8 is the bulk filter cap for the UC3844 VCC rail. R3 and R4 are just dividers on the input voltage doubler. I'm really not sure why they chose such a stiff divider just to balance voltage across caps in series on the 120Hz side. I was looking at the schematic to see if I could relocate them, but I'm actually thinking that upping them to 150k or 220k 1/2w, that should cut the combined dissipation down from 1.1W to 1/4w and make C6 less prone to cooking.

I did loose a trace underneath C6 as well, but it just goes...