KMX50 would start and accelerate to high speed, then slow down some with fairly erratic speed. I tried changing the triac on the main speed control board, then also the whole board (£45). It made no difference.
The only other component I realised it might be was the speed control board which is on the rear end of the motor under the main cover (I found this component on a site selling Kenwood parts, and was where I got the main board from, which is how I know it's speed control). When I inspected it I found two of the terminals broken. You had to look very closely to see they were broken. It's a poor design as the three legs of the terminals are quite long, and very thin, so on high speed when kneading there is much vibration, which is why I suspect the terminals broke. I cut them back just enough to resolder. The component isn't quite fully inside the sensor wheel on the motor shaft, but it still picks up sufficient signal to control the speed and now works fine. Haven't tried it under load yet, but no reason to think it won't work correctly. So check this before ordering a £45 board!
SOURCE: Blakeslee (Kenwood) A717 mixer speed control
I had the same problem. Had to strip the machine down to get to the motor. On the top is a moving plate with various capacitors etc mounted. On the front side there was a Capacitor (At least I think it was) with the wire broken.
I resoldered it and the machine now works fine.
I hope this helps
SOURCE: Blakeslee A717 speed control
Hi,
where are you from, i have phone number to agents that still provide support for A700 series.
SOURCE: Speed control not work - constantly on high
If you can't get the 450 ohm 15watt, use 2 x IKohm 10watt in parallel
SOURCE: Kenwood Chef - slowest speed
if you have max speed you have to replace the .1uf capacitor the 2 spring loaded screws serve far fine adjustment
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