Kenwood Prospero board defective
 

Hi,
I have a Prospero food processor that most probably has a design
failure. When I turn the knob on, the motor has a jerk then stops.
No defective component visually. I suspect this comes from a poor design
of the current sensor that works well with a new motor, and that is
fooled by the collector transients after a year of operation.
Maybe it is possible to improve the design, provided the schematic and
source code for the microcontroller are available.
Does anyone have these documents?
Thanks in advance !
Jean-Marc