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Stitch Length And Zigzag Width Cannot Be Done By Manual Adjustment - Brother NV-10A Service Manual

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Failure Investigation for Electronic Parts
Stitch length and zigzag width
cannot be done by manual
adjustment.
Is the display of LCD nomally turned
on and off with eatch switch?
And is there a click feeling of each
switch?
Is the resistance between pins 1 & 2
and pins 3 & 4 on the Z pulse motor
and the F pulse motor connectors 6.7
– 7.7 Ω?
Is the connector of the Z pulse motor
correctly connected to CN8 of the
main PCB assy.?
Is the connector of the F pulse motor
correctly connected to CN10 of the
main PCB assy.?
Stitch length and zigzag width cannot be
done by manual adjustment
Y
Y
Y
Y
Replace the main PCB assy.
Set the switch correctly
N
or
Replace the operation PCB
assy.
N
Replace the pulse motor
N
Reconnect it correctly
N
Reconnect it correctly
5 - 11

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