Brother PR600 - The Hoop Sensor Does Not Function Normally

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Failure Investigation
for Electronic Parts
Failure Investigation for Electronic Parts The hoop sensor does not function normally.
Change FFC (SML2CD-C).
N
Is the resistance between each terminal at
both ends 1Ω or below when both ends of the
FFC (SML2CD-C) are removed from the PCB?
Y
Change FFC (SML2CD-Y).
N
Is the resistance between each terminal at
both ends 1Ω or below when both ends of the
FFC (SML2CD-Y) are removed from the PCB?
Y
N
Change X area sensor PCB.
Y
Does the machine function normally when the X
area sensor PCB is replaced with a reliable one?
Change hoop sensor and
tune it again.
N
Does the hoop sensor's lever rotate smoothly
and return to the stopper by the force of its
spring when pressed with fingers?
Y
Change hoop sensor and
tune it again.
N
Does the resistance between pins 1 and 2, and 2
and 3 of the connector vary from approximately 0
to 1.2kΩ, respectively, as the lever rotates, when
the hoop sensor's lead is removed from the hoop
sensor PCB? Is the resistance between pins 1
and 3 approximately 1.2kΩ?
Y
Change hoop sensor PCB.
Y
Does the machine function normally when the
hoop sensor PCB is replaced with a reliable one?
N
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