Sharp AR-651 Service Handbook page 239

[CBA] Abnormal saddle stitcher stitch motor (front)
[CBB] Abnormal saddle stitcher stitch motor (rear)
Are the front and rear stitchers and their stands installed properly?
NO
Install them properly.
YES
Are the stitcher home position switches (MS7S/MS5S) on the front and rear stitchers working nor-
mally?
NO
Replace the front or rear stitcher.
YES
Are the front and rear stitchers operating at the fixed timing?
NO
Replace the front or rear stitcher.
YES
Check the wiring between the stitcher and saddle stitcher controller PC board. If there is no problem,
replace the controller PC board.
[CBC] Abnormal saddle stitcher alignment motor
Is the alignment plate home position sensor (PI5S) working normally?
NO
Replace the sensor.
YES
Is the alignment motor (M5S) operating at the fixed timing?
YES
Replace the saddle stitcher controller PC board.
NO
Is the alignment plate drive mechanism normal?
NO
Fix the mechanism.
YES
Is the problem solved by replacing the alignment motor (M5S)?
NO
Replace the saddle stitcher controller PC board.
YES
END
5 - 89 AR-651/810 TROUBLE SHOOTING