Brother MFC640CW - Removing the PF Sensor PCB

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Removing the PF sensor PCB
(11) Disconnect the PF motor/sensor PCB harness from the PF sensor PCB.
(12) Remove the screw from the PF sensor PCB and release the PCB from the engine unit, taking
care not to touch the PF encoder disk.
Ejection idle gear
Engine unit
PF motor/sensor PCB harness
PF sensor PCB
Registration sensor
Screw, bind M2.6x8
PF encoder sensor
PF encoder disk
Paper feed roller