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Speed controllers reduce the power provided to the mixer motor and have to "soak up" some of the power not used. If the mixer was used on low speed but heavy load, it could have burned out the speed controller. Some of them fail by shorting out which means that the motor always gets full power regardless of speed setting. It sounds like your speed controller has burned out.
If it does not start at all until you get to speed 10 then look for a broken wire an any of the wires NOT associated with the phase board. Highly unlikely since you have just been there. Next look at the operation of the switch low down inside the black speed control board. There is a primitive switch there operated by a shaft from your speed control lever. You may find the switch is not activating until it gets right up to speed 10. Have you checked the carbon brushes? The phase board you have just done is normally the culprit for your problem.
My Bamix stopped working--no shaft movement and loud motor noise (think disuse caused motor lubricant to thicken). Propped it upside down and put drops of quality machine oil at seam where narrow blade shaft enters larger shaft (in center of curved guard). Probably not necessary, but added a few drops where large shaft enters handle. Oil slowly seeps in. Attached a blade to manually turn for oil distribution. Did this periodically over several hrs. Turned on low speed and it gradually returned to full speed capacity.
You can get the high speed back if you want to play with those three screws. there is a timing scheme for your mixer and it is set and adjusted by manipulating those 3 screws. The bottom center screw is for speeds 6 8 and 10. The best choice is to replace this switch, about $10 bucks on ebay.
Hi GERALD.You don’t provide your model number so I can only provide a ‘generic’ solution to your problem. More than likely when you inadvertently stripped the plastic (worm) gear the speed control assembly was also damaged electronically. That’s why you get the higher speeds but not the lower speeds. I’ll assume you already have your mixer’s Parts List manual on-hand. If you're lacking one, you can download it from the KA website http://www.kitchenaid.com/flash.cmd?/#/page/home. Click on Customer Care>Locate Manuals & Guides>Enter the 6 character model number and select a file under Parts List (and then check to see it this matches your mixer model). Turn to pages titled "Motor And Control Parts", which provides an exploded view for the disassembly and reassembly of your mixer’s electrical components, along with all the parts.You’ll want to focus on "Control Plate Assembly." First inspect around the control plate assembly to ensure all the wire connections are OK.It's possible a connection has come loose during the reassembly from your first repair.Unfortunately the whole controller assembly is fabricated on a little PC board which was not meant to be 'home fixed', and my 'expertise' ends there.A local small appliance repair shop should be able to determine if the controller assembly is functioning properly or not, or you can just order replacement parts without the testing. 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 can vary widely between vendors, so do your comparison shopping. Here are five potential vendors in no particular order: RepairClinic.com; mendingshed.com; searspartsdirect.com; partstore.com; and Grainger.com. You should be search for ‘food grade grease’. Prices can vary widely between vendors, so do your comparison shopping. Finally, here are some links to several excellent websites that detail the disassembling/reassembly of a KA Mixer that are good to have in your ‘toolbox’.
It sounds like you may have an issue with either the governor assembly and or the main control. If the speed you are getting is constantly going up an down in RPM then this could indicate that the governor has simply become worn and its resistance is gone. If however you get no speed at all and then all of a sudden you get a high speed then it will most likely be the main control. Part number for the governor assembly is 17830. Part number for the main control is 240904−2. Both are relatively simple and cheap to replace. Hope this helps
If you can unplug the mixer and test resistance between leads of the selector switch. The resistance should vary from high to low as you move the selector from low to high. If cord and all else looks good and switch is bad replace the switch.