My K5A is arcing on one of the two contacts on the control board. Any idea why? Replace the control board? Was working fine, then was stuck on high speed. Capacitor was shorted. Replaced with Radio Shack 0.1uF 250V. Worked fine after that, till it started sounding weird. Watched it run with cover off and observed the arcing and see marks from that. I don't remember any arcing there before.
You've accidentally bent the contacts on the control plate, bend them toward each other, they should make flush contact when stir is engaged. Also, turn the bottom screw in till the arcing stops, this will also increase the speed in stir. You further adjust it by turning the top two screws counterclockwise to slow it down. In stir mode, there should be only 10 revolutions in 10 seconds, 60p/m.
It was stuck on high speed because the phase control board went out, your fix may not be absolutely 100% and it is now causing an uneven distribution of the electric charge in the mixer and it is arching. My recommendation is to replace the speed control board (black and copper plate) and the phase control board. i bet it fixes the problem as these are the two parts that regulate the electricity in the mixer. Hope that helps. Buy the way if you don't fix the problem and continue to use the mixer you may have to replace the motor eventually as you can cause the armature and stator to short or burn out.
SOURCE: Kitchenaid K5A mixer 10 speed only runs on fast, no slow speed
Pull the back off and there will be two screws at the top of the Speed Control Plate and a 3rd screw at the bottom. Tighten the top two screws down. [email protected]. Let me know if it works.
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