Brother PR600 - The Picker Does Not Function Normally

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Failure Investigation for Electronic Parts The picker does not function normally.
The picker does not function normally.
Connect it properly.
N
Y
Y
Is the picker sensor's lead properly
connected to CN15 on the main
PCB?
Connect it properly.
N
Y
Is the picker motor's lead properly
connected to CN3 on the main
PCB?
Change picker sensor PCB.
Y
Does the machine function normally when the
picker sensor PCB is replaced with a reliable one?
N
Change picker motor.
N
Is the resistance between pins 1 and 2,
and 3 and 4 of the picker motor 4.7 - 5.7Ω,
respectively, when the motor's connector
CN3 is removed from the main PCB?
Change main PCB.