Thread Cutter Does Not Work Normally - Brother NX600 Service Manual

Failure Investigation for Electronic Parts Thread cutter does not work normally
Do the thread hook assy. and lever
gear move easily?
Is the resistance between the 1 & 2
pins and 3 & 4 pins on the C pulse
motor connectors (CN11) 4 – 6 Ω?
5 - 14
Thread cutter does not operate
normally
Y
Y
Replace main F3D PCB assy.
N
Adjust the assembly of the
thread cutter module
N
Replace C pulse motor