Sharp AR-650 Service Handbook page 148

[CB4] alignment motor is abnormal
Is the aligning plate home position sensor normal?
No
Yes
Is the wiring between the finisher controller board and the alignment motor normal?
No
Yes
Is there a mechanical object caught on the alignment plate movement path?
Yes
No
Does replacement of the alignment motor (M3) rectify the trouble?
No
Yes
END
[CB5] Stapler motor is abnormal
Is the wiring between the stapler and the finisher controller board normal?
No
Yes
Does replacement of the stapler rectify the trouble?
No
Yes
END
TROUBLE SHOOTING
Replace the sensor.
Correct the wiring.
Correct the mechanical mechanism.
Replace the finisher controller board.
Correct the wiring.
Replace the finisher controller board.
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