Sharp AR-651 Service Handbook page 195

[EA9] Saddle stitcher door opened during printing
Is there any paper remaining on the transport path in the finisher, saddle stitcher section or main unit?
YES
Remove the paper.
NO
Is the saddle stitcher door closed?
NO
Close the door.
YES
Is either of the connectors J10 or J11 on saddle stitcher controller PC board disconnected?
Are the harnesses connecting the saddle stitcher controller PC board and cover opening sensors
(PI2S: front door opening/closing sensor, PI3S: delivery cover sensor, PI19S: inlet cover sensor)
open-circuited?
YES
Connect the connector securely. Replace the harness.
NO
Are the cover opening sensors working properly?
NO
1. Connect the connectors of the cover opening sensors securely.
2. Replace the cover opening sensors.
YES
Replace the finisher controller PC board.
5 - 45 AR-651/810 TROUBLE SHOOTING