5 - 9
Failure Investigation
for Electronic Parts
Failure Investigation for Electronic Parts
Thread breakage detection does not function normally.
Thread breakage detection does
not function normally.
Connect it properly.
N
Y
Y
Is the FFC for the thread quantity sensors
properly connected to each thread quantity
sensor and connectors (CN1 - CN6) on the head
PCB? Is the orientation of the FFC correct?
Connect it properly.
N
Y
Is the head lead properly connected to
connector CN7 on the head PCB and
connector CN8 on the main PCB?
Change thread quantity
sensor's FFC.
N
Y
Is the resistance between each terminal at both
ends 1Ω or below when the thread quantity
sensor's FFC is removed from the PCB?
Change head leads.
N
Y
Is the resistance between each pin at both ends
1Ω or below when connectors at both ends of
the head leads are removed from the PCB?
Change thread quantity
sensor PCB.
Y
N
Does the machine function normally when the thread
quantity sensor PCB is replaced with a reliable one?
Change main PCB.
N
Does the machine function normally when the
head PCB is replaced with a reliable one?
Change head PCB.
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