Main Motor Does Not Turn - Brother XR9000 Service Manual

Failure Investigation
for Electronic Parts
Is the main motor connector correctly
connected to the power PCB assy. (CN401)?
Is the main motor resistance 2-5Ω
at any rotation position?
Is the power lead wire assy. free from
damage and correctly connected to
the main PCB assy. and power
supply PCB assy.?
When press the start/stop button,
reverse stitch button and needle
position button, does the buzzer
sound? Is "F6" displayed?
5 - 6

Main motor does not turn

Main motor does not turn.
Does the pulley turn smoothly?
Y
Y
Y
Y
Y
To next page
N
Reassemble the upper shaft
assy.
N
Connect it properly.
N
Replace the main motor.
N
Connect the power lead wire
assy. correctly or replace it.
N
Replace the SSVR PCB assy.