Speed selector is fussy, and a short has occured
CCFSILVER - When you say your speed selector is fussy, do you mean fussy in a 'electrical' sense or fussy in a 'mechanical' sense? Also, you didn't say if the short is causing power to the motor to be cut or what specifically the short is doing. For now I'll assume that you mean 'fussy' in an electrical manner. That being said, the speed selector is fixable. If your mixer is under warranty, contact KA and ask them to remedy the problem. If it is not under warranty, then you can attempt to fix it yourself. This will not be for the weak of heart, as you have to disassemble your mixer. It that is not within your capabilty than you should take the mixer to an authorized KA repair shop in your area. If you think you can do it your self, great!
First, do you still have the KSM90 Parts List? If not, you can download a PDF version from the KA website. Click on Customer Care>Locate Manuals & Guides> Enter the 6 character model number (in your case, use KSM90P) and select one of the files that appear under Parts List. If you turn to page 6 you will find the exploded view of the motor and the speed control. I suspect your fussy selector issues are being caused by Illus Nos. 24, 25, or 27 (the Governor Assembly, the Control Plate Assembly or Phase Control Board, repsectively). I would order all three parts on the assumption that if one has gone bad, the others aren't far behind. As far as parts go, here are four potential vendors in no particular order: RepairClinic.com; mendingshed.com; searspartsdirect.com; partstore.com. Prices for the same part may vary widely between vendors, so do your comparison shopping.
Good Luck, I hope this is helpful. Howard, Burke, VA
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