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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? 
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Rank: Advanced Member
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Joined: 7/27/2010(UTC) Posts: 1,395  Location: near the middle of nowhere Was thanked: 24 time(s) in 24 post(s)
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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.
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Rank: Member
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There is no fuse.
Would the boards be available as parts?
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Rank: Advanced Member
Groups: Expert
Joined: 7/27/2010(UTC) Posts: 1,395 Location: near the middle of nowhere Was thanked: 24 time(s) in 24 post(s)
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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. 
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Rank: Member
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Joined: 1/5/2017(UTC)
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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.
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