• Code: C8350
• Description: BF side registration motor 1 error Object: 4000-sheet finisher with the folding unit
• Causes: BF side registration sensor 1 does not turn on after passing 1s during the initial operation.
• Remedy: 1 Checking the lower BF side registration guide The lower BF side registration guide is not assembled properly. If the lower BF side registration guide is not operated manually, repair the part that restricts the operation. 2 Checking the lower BF side registration guide drive components The BF side registration lower guide drive components are not properly attached, or they are faulty. Reattach the BF side registration lower guide drive components. Then, replace them if they are not fixed. 3 Checking the wire The wire is not properly connected or is faulty. Reinsert the following wire connectors, and replace the wire when it has no continuity.• BF side registration motor 1 - BF main PWB• BF side registration sensor 1 - BF main PWB Electrical Diagram of PWBs 4 Replacing BF side registration motor 1 BF side registration motor 1 is faulty. Replace BF side registration motor 1 if it does not operate properly when checking the operation at U240. U240 Execution 5 Checking BF side registration sensor 1 BF side registration sensor 1 is not properly attached, or it is faulty. Reattach BF side registration sensor 1 and execute U241 to check the operation.If it does not operate properly, replace the sensor. U241 Execution 6 Replacing the BF main PWB The BF main PWB is faulty. Replace the BF main PWB.

• Code: C8360
• Description: BF main motor error Object: 4000-sheet finisher with the folding unit
• Causes: The lock-up signal was detected for 1s continuously during the motor operation.
• Remedy: 1 Checking the BF conveying roller The BF conveying roller is not assembled properly. If the BF conveying roller is not rotated manually, repair the part that restricts the operation. 2 Checking the BF conveying roller drive components The BF conveying roller drive components are not properly attached, or they are faulty. Reattach the BF conveying roller drive components. Then, replace them if they are not fixed. 3 Checking the wire The wire is not properly connected or is faulty. Reinsert the following wire connectors, and replace the wire when it has no continuity.• BF main motor - BF main PWB Electrical Diagram of PWBs 4 Replacing the BF main motor The BF main motor is faulty. Replace the BF main motor if it does not operate properly when checking the operation at U240. U240 Execution 5 Replacing the BF main PWB The BF main PWB is faulty. Replace the BF main PWB.

• Code: C8370
• Description: BF staple motor error 2 Object: 4000-sheet finisher with the folding unit
• Causes: The BF staple jam was detected 2 times continuously.(Detection condition of 2nd paper jam: The lock-up signal was generated for 500ms continuously during the motor operation.)
• Remedy: 1 Checking the BF staple unit The BF staple unit is not assembled properly. If the BF staple unit is not operated manually, repair the part that restricts the operation. 2 Checking the BF staple unit drive components The BF staple unit drive components are not properly attached, or they are faulty. Reattach the BF staple unit drive components. Then, replace them if they are not fixed. 3 Checking the wire The wire is not properly connected or is faulty. Reinsert the following wire connectors, and replace the wire when it has no continuity.• BF staple unit - BF main PWB Electrical Diagram of PWBs 4 Replacing the BF staple motor The BF staple motor is faulty. Replace the BF staple motor if it does not operate properly when checking the operation at U240. U240 Execution 5 Replacing the BF staple unit The BF staple unit is faulty. Replace the BF staple unit. 6 Replacing the BF main PWB The BF main PWB is faulty. Replace the BF main PWB.

• Code: C8410
• Description: PH slide motor error 1 Object: 4000-sheet finisher or 1000-sheet finisher with the punch unit
• Causes: The PH slide sensor does not turn on after shifting 30mm when relocating to the home position.
• Remedy: 1 Checking the punch unit The punch unit is not assembled properly. If the punch slide section is not shifted manually forwardbackward, repair the part that restricts the operation. 2 Checking the punch drive components The punch drive components are not properly attached, or they are faulty. Reattach the punch drive components. Then, replace them if they are not fixed. 3 Checking the wire The wire is not properly connected or is faulty. Reinsert the following wire connectors, and replace the wires when they have no continuity.• PH slide motor - PH main PWB• PH slide sensor - PH main PWB• PH main PWB - DF main PWB Electrical Diagram of PWBs 4 Replacing the PH slide motor The PH slide motor is faulty. Replace the PH slide motor if it does not operate properly when checking the operation at U240. U240 Execution 5 Checking the PH slide sensor The PH slide sensor is not properly attached, or it is faulty. Reattach the PH slide sensor and execute U241 to check the operation. If it does not properly operate, replace the sensor. U241 Execution 6 Replacing the PH main PWB The PH main PWB is faulty. Replace the PH main PWB. 7 Replacing the DF main PWB The DF main PWB is faulty. Replace the DF main PWB. DF Main PWB Replacement

• Code: C8420
• Description: PH slide motor error 2 Object: 4000-sheet finisher or 1000-sheet finisher with the punch unit
• Causes: The paper edge cannot be detected even if shifting 30mm when detecting the paper edge.
• Remedy: 1 Checking the punch unit The punch unit is not assembled properly. If the punch slide section is not shifted manually forwardbackward, repair the part that restricts the operation. 2 Checking the punch drive components The punch drive components are not properly attached, or they are faulty. Reattach the punch drive components. Then, replace them if they are not fixed. 3 Checking the wire The wire is not properly connected or is faulty. Reinsert the following wire connectors, and replace the wires when they have no continuity.• PH slide motor - PH main PWB• PH slide sensor - PH main PWB• PH main PWB - DF main PWB Electrical Diagram of PWBs 4 Replacing the PH slide motor The PH slide motor is faulty. Replace the PH slide motor if it does not operate properly when checking the operation at U240. U240 Execution 5 Checking the PH paper edge sensors 1, 2 PH paper edge sensors 1, 2 are not properly attached, or they are faulty. Reattach PH paper edge sensors 1, 2. Then, execute U241 to check the operation. If it does not operate properly, replace the sensors. U241 Execution 6 Replacing the PH main PWB The PH main PWB is faulty. Replace the PH main PWB. 7 Replacing the DF main PWB The DF main PWB is faulty. Replace the DF main PWB. DF Main PWB Replacement

• Code: C8430
• Description: Main program error / Punch unit communication error
• Causes: The communication could not succeed after confirming the connection with the punch unit.
• Remedy: 1 Checking the wire The wire is not properly connected or is faulty. Reinsert the following wire connectors, and replace the wire when it has no continuity.• PH main PWB - DF main PWB Electrical Diagram of PWBs 2 Replacing the PH main PWB The PH main PWB is faulty. Replace the PH main PWB. 3 Replacing the DF main PWB The DF main PWB is faulty. Replace the DF main PWB. DF Main PWB Replacement

• Code: C8500
• Description: Main program error / Mail Box communication error Object: 4000-sheet finisher with the mail box
• Causes: The communication failed after confirming the connection with the mail box.
• Remedy: 1 Resetting the main power The PWB malfunctions. Turn the power switch and the main power switch off . After 5s passes, turn the main power switch and the power switch on. 2 Checking the wire The wire is not properly connected or is faulty. Reinsert the following wire connectors, and replace the wire when it has no continuity.• MB main PWB - DF main PWB Electrical Diagram of PWBs 3 Replacing the MB main PWB The MB main PWB is faulty. Replace the MB main PWB. 4 Replacing the DF main PWB The DF main PWB is faulty. Replace the DF main PWB. DF Main PWB Replacement

• Code: C8510
• Description: MB conveying motor error 1 Object: 4000-sheet finisher with the mail box
• Causes: The MB home position sensor does not turn on after passing 5s during the initial operation.
• Remedy: 1 Checking the MB conveying roller The MB conveying roller is not assembled properly. If the MB conveying roller is not rotated manually, repair the part that restricts the operation. 2 Checking the wire The wire is not properly connected or is faulty. Reinsert the following wire connectors, and replace the wires if there is no continuity.• MB conveying motor - MB main PWB• MB home position sensor - MB main PWB Electrical Diagram of PWBs 3 Replacing the MB conveying motor The MB conveying motor is faulty. Replace the MB conveying motor if it does not operate properly when checking the operation at U240. U240 Execution 4 Checking the MB home position sensor The MB home position is not properly attached, or it is faulty. Reattach the MB home position sensor and execute U241 to check the operation. If it does not operate properly, replace the sensor. U241 Execution 5 Replacing the MB main PWB The MB main PWB is faulty. Replace the MB main PWB.