Brother PR655 Service Manual page 284

Failure Investigation for Electronic Parts
Main motor current error
(Dialog message)
Is the main motor's lead properly
connecte d to the power supply
PCB's lead?
Is the power motor's lead properly
connecte d to CN4 on the power
supply PCB?
Does the machine function normally
when the power supply PCB unit is
replaced with a reliable one?
Change the power supply
PCB unit.
Error message
Y
Y
Y
Y
5 - 29
N
Connect it properly.
N
Connect it properly.
N
Change the main motor.
N
Change the main PCB.