• Code: C8420
• Description: PH slide motor error 2 Object: 4000-sheet finisher or 1000-sheet finisher with the punch unit 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 does not move front and back manually, repair the position where restricts the operation. 2 Checking the PH drive parts The PH drive parts are not attached properly, or faulty. Reattach the PH drive parts. If not repaired, replace them. 3 Checking the connection The connector is not connected properly, or the wire is faulty. Clean the terminal of the following wire connectors and reconnect the connectors. If there is no continuity, replace the wire. . PH slide motor - PH PWB . PH paper edge sensor 1, 2 - PH PWB . PH PWB - DF PWB Section 8 "PWBs" 4 Replacing the PH slide motor The PH slide motor is faulty. Execute U240 [Motor] > [Punch Move]. If the PH slide motor does not operate properly, replace the DF staple unit. Maintenanc e Mode List 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 sensor 1 or 2, then check the sensor operation by executing U241. If PH paper edge sensor 1 or 2 does not operate properly, replace it. Maintenanc e Mode List 6 Replacing the PH PWB The PH PWB is faulty. Replace the PH PWB. Detaching and reattaching the PH PWB (PH- 7A/C/D Installation Guide) 7 Replacing the DF PWB The DF PWB is faulty. Replace the DF PWB. Detaching and reattaching the DF PWB

• Code: C8430
• Description: Main program error / Punch unit communication error Object: 1000-sheet finisher, 4000-sheet finisher (When punch unit is installed) The communication could not succeed after confirming the connection with the punch unit.
• Remedy: 1 Checking the connection The connector is not connected properly, or the wire is faulty. Clean the terminal of the following wire connectors and reconnect the connectors. If there is no continuity, replace the wire. . PH PWB - DF PWB Section 8 "PWBs" 2 Replacing the PH PWB The PH PWB is faulty. Replace the PH PWB. Detaching and reattaching the PH PWB (PH- 7A/C/D Installation Guide) 3 Replacing the DF PWB The DF PWB is faulty. Replace the DF PWB. Detaching and reattaching the DF PWB

• Code: C8500
• Description: Main program error / Mail Box communication error Object: 4000-sheet finisher with the mail box 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 connection The connector is not connected properly, or the wire is faulty. Clean the terminal of the following wire connectors and reconnect the connectors. If there is no continuity, replace the wire. . MT PWB - DF PWB Section 8 "PWBs" 3 Replacing the MT PWB The MT PWB is faulty. Replace the MT PWB. 4 Replacing the DF PWB The DF PWB is faulty. Replace the DF PWB. Detaching and reattaching the DF PWB

• Code: C8510
• Description: MB conveying motor error 1 Object: 4000-sheet finisher with the mail box The MT home position sensor does not turn on after passing 10s during the initial operation.
• Remedy: 1 Checking the MT conveying roller The MT conveying roller is not assembled properly. If the MT conveying roller is not rotated manually, repair the part that restricts the operation. 2 Checking the connection The connector is not connected properly, or the wire is faulty. Clean the terminal of the following wire connectors and reconnect the connectors. If there is no continuity, replace the wire. . MT conveying motor - MT PWB . MT home position sensor - MT PWB Section 8 "PWBs" 3 Replacing the MT conveying motor The MT conveying motor is faulty. Execute U240 [Mail Box] > [Conv]. If the MT conveying motor does not operate properly, replace it. Maintenanc e Mode List 4 Checking the MT home position sensor The MT home position is not properly attached, or it is faulty. Reattach the MT home position sensor, then execute U241 [Mail Box] > [Motor HP]. If the MT home position sensor does not operate properly, replace it. Maintenanc e Mode List 5 Replacing the MT PWB The MT PWB is faulty. Replace the MT PWB.

• Code: C8520
• Description: MB conveying motor error 2 Object: 4000-sheet finisher with the mail box The MT home position sensor does not turn off after passing 2s during the standby operation.
• Remedy: 1 Checking the MT conveying roller The MT conveying roller is not assembled properly. If the MT conveying roller is not rotated manually, repair the part that restricts the operation. 2 Checking the MT conveying roller drive parts The MT conveying roller drive parts are not properly attached, or they are faulty. Reattach the MT conveying roller drive parts. 3 Replacing the MT conveying roller drive parts The MT conveying roller drive parts are faulty. Replace the MT conveying roller drive parts. 4 Checking the connection The connector is not connected properly, or the wire is faulty. Clean the terminal of the following wire connectors and reconnect the connectors. If there is no continuity, replace the wire. . MT conveying motor - MT PWB . MT home position sensor - MT PWB Section 8 "PWBs" 5 Replacing the MT conveying motor The MT conveying motor is faulty. Execute U240 [Mail Box] > [Conv]. If the MT conveying motor does not operate properly, replace it. Maintenanc e Mode List 6 Checking the MT home position sensor The MT home position is not properly attached, or it is faulty. Reattach the MT home position sensor, then execute U241 [Mail Box] > [Motor HP]. If the MT home position sensor does not operate properly, replace it. Maintenanc e Mode List 7 Replacing the MT PWB The MT PWB is faulty. Replace the MT PWB.

• Code: C8800
• Description: Main program error / Engine - DF communication error (DF) Object: 1000-sheet finisher, 4000-sheet finisher 1. When turning on the power, there was an error in the main program. 2. The communication error between the Engine and DF is detected 10 times continuously. 3. The ready signal is not notified from the DF within 6s after the communication starts.
• Remedy: 1 Resetting the main power The program does not start up properly. Turn the power switch and the main power switch off . After 5s passes, turn the main power switch and the power switch on. 2 Firmware upgrade The firmware is not the latest version. Upgrade the DP firmware to the latest version. Firmware Update 3 Checking the connection The connector is not connected properly, or the wire is faulty. Clean the terminal of the following wire connectors and reconnect the connectors. If there is no continuity, replace the wire. . DF PWB - Engine PWB Section 8 "PWBs" 4 Replacing the DF PWB The DF PWB is faulty. Replace the DF PWB. Detaching and reattaching the DF PWB 5 Firmware upgrade The firmware is not the latest version. Upgrade the engine firmware to the latest version Firmware Update 6 Replacing the engine PWB The engine PWB is faulty. Replace the engine PWB. Detaching and reattaching the Engine PWB

• Code: C8900
• Description: DF backup error Object: 1000-sheet finisher, 4000-sheet finisher For internal count The writing data and the reading data mismatch 3 times continuously.
• Remedy: 1 Checking the connection The connector is not connected properly, or the wire is faulty. Clean the terminal of the following wire connectors and reconnect the connectors. If there is no continuity, replace the wire. . DF PWB - Engine PWB Section 8 "PWBs" 2 Replacing the DF PWB The DF PWB is faulty. Replace the DF PWB. Detaching and reattaching the DF PWB

• Code: C8930
• Description: BF unit backup error Object: 4000-sheet finisher with the folding unit For internal count The writing data and the reading data mismatch 3 times continuously.
• Remedy: 1 Checking the connection The connector is not connected properly, or the wire is faulty. Clean the terminal of the following wire connectors and reconnect the connectors. If there is no continuity, replace the wire. . BF PWB - DF PWB Section 8 "PWBs" 2 Replacing the BF PWB The BF PWB is faulty. Replace the BF PWB.