U Tube to the rescue
We have a Kenwood Chef Titanium KMC010I and I found a U-tube video of how to take it apart. The machine was stuck on high speed only. I had a choice of buying the 3 electronic parts only for about £11 or buying the whole of the control printed circuit board with the silver rotating control knob for £31. I have a soldering iron and solder sucker but the down side is that I felt there was no gaurantee that it would be one of those 3 parts that needed replacing (although likely to be) and that I could damage the pc board if not carefull. Taking the machine apart is tricky at first and access to some of the screws is a bit difficult. Once achieved this complete part makes it easy, replacing everything including the mechanical rotating knob which I noticed from other articles, can get stuck also. It's very good quality and looks just like the original. The machine now works perfectly and this part provides a low-cost solution, considering the high cost of the Chef.
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