Brother PR655 Service Manual page 266

Failure Investigation for Electronic Parts
Does the machine function normally when the Y
area sensor PCB is replaced with a reliable one?
Does the machine function normally when the
connect PCB is replaced with a reliable one?
Is the resistance between pins 1 and 2,
and 3 and 4 of the X motor 5.4 - 6.8Ω,
respectively, when the motor's connector
CN2 is removed from the connect PCB?
Is the resistance between pins 1 and 2,
and 3 and 4 of the Y motor 5.2 - 6.4Ω,
respectively, when the motor's connector
(CN24) is removed from the main PCB?
The hoop does not move normally.
From the previous page
N
N
Y
Y
Change the main PCB.
5 - 11
Y
Change the Y area sensor PCB.
Y
Change the connect PCB.
N
Change the X motor.
N
Change the Y motor.