Thread Breakage Detection Does Not Function Normally - Brother PR600II Service Manual

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

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