I am professional electronics technician of the 'old school'. I hand-drew the schematic for Pfaff 1222 which I was repairing. I know it is not too good looking, but it is accurate for the machine I worked on. It will be useful for technicians wishing to do repairs to the Pfaff electronic motor control section. These brilliant machines are getting really old and suffer failure in many electronic components but all can be replaced by competent person!