Universal Serial Bus (Usb) Cannot Be Used Normally - Brother PR600 Service Manual

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