Brother PR600II Service Manual page 308

Failure Investigation for Electronic Parts Error message
Is the main shaft motor's lead
properly connected to CN1 on the
main PCB?
Is the resistance between pins 1 and 2 of the
main shaft motor 1.0 - 2.0Ω when the motor's
connector CN2 is removed from the main PCB?
Does the machine function normally when the
power PCB is replaced with a reliable one?
5 - 26
Main motor current error
(Dialog message)
Y
Y
Y
Change power PCB.
N
Connect it properly.
N
Change main shaft motor.
N
Change main PCB.