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Failure Investigation
for Electronic Parts
Failure Investigation for Electronic Parts
Universal serial bus (USB) cannot be used normally.
Universal serial bus (USB) cannot
be used normally.
Connect it properly.
N
Y
Y
Is the USB cable properly connected to both the
personal computer and the sewing machine?
Change USB cable.
Y
N
Does the machine function normally when the
USB cable is replaced with a reliable one?
Connect them properly.
N
Are relay connectors for the lead
on the USB PCB and USB lead A
properly connected to each other?
Y
Change USB PCB.
Y
Does the machine function normally when
the USB PCB is replaced with a reliable one?
N
Connect it properly.
N
Is USB lead A properly connected
to connector CN6 on the panel
PCB?
Y
Change panel PCB.
N
Does the machine function normally when
USB lead A is replaced with a reliable one?
Change USB lead A.
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