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Failure Investigation for Electronic Parts
Thread tensioning does not go well
Set thread correctly
Thread tensioning is not right
Is the thread guide path correct?
N
Set the lower thread correctly
Is the lower thread placement correct?
N
Y
Use the correct combination
Is the material, thread and needle
combination correct?
N
Y
Adjust upper thread tension
or
Adjust upper thread tension disk
N
Y
Adjust inner rotary hook tension
Is the inner rotary hook tension right?
Is the tension right?
or
Is the thread tension adjuster gap correct?
N
Y
Replace pulse motor
Is the resistance between the 1 & 2
pins and 3 & 4 pins on the AT pulse
motor connectors (CN10) 4 – 6 Ω?
N
Y
Replace main NF3D PCB assy.
Y
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