Brother PR600 - Thread Is Not Cut Normally

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Failure Investigation
for Electronic Parts
Failure Investigation for Electronic Parts Thread is not cut normally.
Thread is not cut normally.
Connect it properly.
N
Y
Y
Is the thread cutter sensor's lead
properly connected to CN11 on the
main PCB?
Connect it properly.
N
Y
Is the thread cutter motor's lead
properly connected to CN6 on the
main PCB?
Change thread cutter sensor PCB.
Y
Does the machine function normally when the thread
cutter sensor PCB is replaced with a reliable one?
N
Change thread cutter motor.
N
Is the resistance between pins 1 and 2, and
3 and 4 of the thread cutter motor 5.6 - 6.4Ω,
respectively, when the motor's connector
CN6 is removed from the main PCB?
Change main PCB.