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Krups produce a premium product and it would be surprising if they didn't also have a repair or exchange service. Sometimes such a service is a reasonable cost and it is advisable to at least make the enquiry before proceeding further with your home repair.
Early food mixers used a number of series resistors for speed control and the circuit was fairly straightforward to check with a multimeter and any capacitors found are likely to be radio interference suppressors.
Later mixers use an electronic speed control and the best mixers use feedback to maintain the speed and torque when mixing or beating viscous material that would otherwise slow the speed significantly.
Checking/troubleshooting the electronics are beyond the scope of home repair, however, the circuit can be checked to the speed control fairly simply and then from the speed control to the motor and the motor itself. If everything else checks out then it would be reasonable to assume the electronic speed control has failed.
Early electronic speed control used either a thyristor as the control device or a diac/triac pair mounted on a small circuit board. Later types probably use a speed control module similar in principle to those found in power drills...
The speed selector circuit has been compromised but either an electrical short, or disruption from particles that entered the switching mechanism and covered contacts. Needs technical attention.
On the professional 600 model there is a speed control board (Computer board) that is probably the culprit. Easy fix cost $30-$35.00 dollars for the part plus shipping. if you are under warranty then Kitchenaid will fix. If not you can do it quickly. Go to kitchenaid site look for support tab on right top side of window and click it, look for get user guides and manuals in the next window, click it, enter on the right side of the next page the model number and who you are (consumer), then you will be taken to another page that has the manuals listed on the left the upper manual is for user guide the lower manual is for parts list. Down load the parts guide / list so that you can find your particular speed board and it will show you how to disassemble and replace. It really is an easy fix. Not messy or complicated, just take your time and lay your parts out in a manner that will make YOU remember how they go back in. There are no other computer boards in the mixer so you will have no problem recognizing it. call Kitchenaid customer service and ask where the nearest service center is, if you live close by take your part number to the center and you can probably get it at the parts desk (fast parts, more expensive than internet, no shipping costs) Please let us know if this helps or if you need more help, that's why we're here.
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