Question about Cuisinart SM-55 Stand Mixer

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My Cuisinart stand mixer won't work. It is getting electricity -- the timer light is on -- but when I press the on/off button, there is a click and no movement. This happens with the blender attachment, as well as the mixer. I think it is the motor. It is in a dedicated cabinet, and has been plugged in constantly. I have unplugged it to reset it, to no avail. Any ideas?

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  • trenton_deac
    trenton_deac Mar 28, 2012

    Traced the circuit on the board for days to find the problem. If you have an original unit you have a optocoupler on the board made by Sharp PC817b. It has died. The refurbished units now use a Sharp PC817c which is higher rated. You can order the higher rated unit online and replace it with some decent soldering skills. Verify by testing the diode across pins 1 and 2. Make note of the orientation of the chip on the board and replace. Be careful to not heat the chip up to much as this will burn the diode out again. This replacement will likely void your warranty. I wasn't going to pay for shipping on this thing. So I voided away! :)

  • Ben Franske
    Ben Franske Nov 09, 2013

    I had the same problem. I ordered some Sharp PC817c optos from ebay and replaced it which fixed the problem. A couple notes... The control board is inside the grey plastic enclosure in the vertical part of the mixer, you'll also need to take a heatsink off the control board in order to get to the opto, otherwise a very straightforward repair. Mine now works great again.

  • Ben Franske
    Ben Franske Nov 09, 2013

    Here is what the control board looks like removed from the mixer and the heatsink removed.

  • Gail
    Gail Nov 28, 2013

    I am trying to replace the relay on my SM70 mixer. Someone removed the original component so I don't have the particulars to order another. I believe it is by Omron. I am hoping that one of you folks might have an idea of what I am looking for. Thanks.

  • John Schonewille Dec 04, 2013

    Seach for "Mikofox " here, maybe a pm would get you on track, it is quite easy if you have (de)/soldering expeirience.

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Hi,
It sounds Motor Control Board got problem as you hear relay click but motor does not get power to rotate from motor control board.
It is electronic hardware failure issue, its not user level repair and professional can do it.
Click Cuisinart Contact link to find out nearest repair center in your area.
Hope these info will help you.
Thanks.

Posted on Oct 09, 2010

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If problem continues, here is an excerpt from the user manual found here.

http://www.cuisinart.com/share/pdf/manuals/sm-55.pdf

Problem: Your stand mixer has an
overload protection device and if
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Solution: In the unlikely even that this
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• Turn off and unplug the unit.
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