Hi Spec,
Thanks for the sound advice!
I'll start fresh here with more details that should help my situation.
I bought this used Subwoofer and it was working "fine" with the exception of a bit of intermittent audio "crackle" on start up,
and sometimes for a minute or so until it warmed up.
I took the unit apart for a visual inspection, and found a Diode was visibly showing issues.
Here's a pic of the unit first apart (Issue is where the Diode is installed):
Up Close of the Diode:
First Action: Sprayed the area with contact cleaner (not knowing I should have tested the diode itself).
After I re-installed, and fired up the unit.. The power light goes on, and there's clearly no audio.
However, interestingly enough, since it's a Sub, and has outputs to 2 studio monitors, there is signal going thru, and I can hear
those monitors (just no sub).
After disassembly this time, I removed the Diode to inspect it. It broke in half. I removed a 2nd Diode so I could identify what it was, and luckily found a package of replacements at a local Radio Shack.
I replaced the 2 Diodes (got savvy and tested them both with my VM which has a diode setting).
Plugged in, and still no sub audio. Everything else was good (power, and monitor signal).
Then I took it apart again, and noticed this (which I may have missed the first time). Lesson to be learned here (my thought):
Two Resistors on the other side after a bit of clean up:
In context this is where this is on the board:
I also took some images of the whole kit in context to this board.
Back Panel:
Back Panel Side:
Inside (showing the power - volume control board / pre):
The other side from that (the ins/outs):
From a reference stand point, I haven't found a service manual yet, but here are a few links:
https://www.krksys.com/krk-subwoofers/10s.html
The one I own is 1 rev back than the one listed above.
Here’s a PDF of the manual (page 18 has the specs which are not detailed enough):
https://www.krksys.com/manuals/subwoofers/MANUAL_KRK10S-D_Web.pdf
I found that @ Full Compass it’s possible to buy a completed Replacement Amp Assembly here:
https://www.fullcompass.com/prod/259996-KRK-AMPK00055
Hope all this is useful!