Im so sorry im rising such old topic from the ashes, but it is the only one on the internet with same problem as mine. I recieved my machine and it could only go to about 500 RPMS less than specified. I was sent by manufaturer adjustment procedure and while trying it the motor has jumped 5800 RPM and fuses exploded. My PCB is a newer variant with IKCS22F60F2C . It could be seen PCB was hand repaired before as many other junk Chinese packed on this machine (i was an one time buyer, so great way to get rid of various defective parts that were not shipped to Optimum). I replaced the burnt PFC stage, IKCS22F60F2C, input rectifier and my board works now. However the motor does not work and PCB only makes short 6 flashes (error code maybe?) and freezes. I managed to get a new tested board, but this behave same as one i repaired.

Im suspecting the motor, but never worked with BLDC motors in past. How should i test this motor? Its same as motor allready shown here. Should i open it up and test Hall sensors?