I bought a small oven, the Ktichenaid KCO275.
It has an internal speaker that loudly sounds for any input you give it.
To silence it I took it apart. As I was unsure where the speaker was I plugged it in to listen. While twisting an input knob the control board shifted and made contact with the frame.
My guess is that this created a short as I heard a fuse snap and the unit went dark.
Now I need to find and replace the fuse. Then find and remove the speaker.
I have no idea where the fuse is, my guess for the speaker is the round black element on the control board labeled BZ?
BZ would be buzzer or piezo buzzer. Yes it makes noise.
I hope your boards survived. Follow the power cord coming in. One side should have a fuse holder on it. Always replace the fuse with the same type and amperage.
There is no fuse.
Would the boards be available as parts?
It might look like this. I thought I could see the edge of one on the far right of your pic behind the circuit board.
Thanks for the help.
It turns out this model does not have a fuse. Power comes in, through a resistor and the 2 diodes. Then out the drain of the switching voltage regulator.
However, much simpler is the fact that I tripped the GFCI on the wall power outlet. After a re-set it now powers on.