The Main Shaft Does Not Rotate Normally - Brother PR600II Service Manual

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Failure Investigation for Electronic Parts The main shaft does not rotate normally.
Is the main shaft encoder deformed,
bent, or damaged due to contact?
Is the main shaft sensor's lead
properly connected to CN17 on the
main PCB?
Is the main shaft motor's lead
properly connected to CN1 on the
main PCB?
Does the machine function normally when the main
shaft sensor PCB is replaced with a reliable one?
Is the resistance between pins 1 and 2 of the
main shaft motor 1.0 - 2.0Ω when the motor's
connector CN2 is removed from the main PCB?
Does the machine function normally when the
power PCB is replaced with a reliable one?
5 - 12
The main shaft does not rotate
normally.
Y
Y
Y
N
Y
N
Change main PCB.
N
Change main shaft encoder.
N
Connect it properly.
N
Connect it properly.
Y
Change main shaft sensor
PCB.
N
Change main shaft motor.
Y
Change power PCB.

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