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Electronic Parts
Failure Investigation for Electronic Parts
Cannot sew pattern well
Replace NP F2 PCB assy.
Normal pattern is not generated
When the upper shaft pulley is slowly
turned by hand, does the voltage
between pins 4 & 1 and pins 5 & 1 on the
main NF3D PCB assy. vary 0 – 5 V DC?
N
Adjust the attachment of the
needle-presser module
N
Replace main NF3D PCB assy.
Y
Y
With the power OFF, can you lightly
move the needle bar left and right by
hand?
Replace pulse motor
N
Y
Is the resistance between pins 1 & 2
and pins 3 & 4 on the Z pulse motor
and F pulse motor connectors 4 – 6 Ω ?
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