• Code: C8800
• Description: Document finisher communication problem (optional 3000-sheet document finisher) No communication: there is no reply after 5 retries. Abnormal communication: a communication error (parity or checksum error) is detected five times in succession.
• Causes: Poor contact in the connector terminals. Defective PWB.
• Remedy: Poor contact in the connector terminals. Check the connection of connector on the finisher main PWB and the connector on the engine PWB, and the continuity across the connector terminals. Repair or replace if necessary. Defective PWB. Replace the finisher main PWB or engine PWB and check for correct operation.

• Code: C8900
• Description: Backup memory data problem (optional 3000-sheet document finisher) Read and write data does not match.
• Causes: Poor contact in the connector terminals. Defective finisher main PWB.
• Remedy: Poor contact in the connector terminals. Check the connection of connector on the finisher main PWB and the connector on the engine PWB, and the continuity across the connector terminals. Repair or replace if necessary. Defective finisher main PWB. Replace the finisher main PWB and check for correct operation.

• Code: C8910
• Description: Backup memory data problem (optional punch unit of 3000-sheet document finisher) Read and write data does not match.
• Causes: Poor contact in the connector terminals. Defective punch PWB.
• Remedy: Poor contact in the connector terminals. Check the connection of connector on the punch PWB and the connector YC4 on the finisher main PWB, and the continuity across the connector terminals. Repair or replace if necessary. Defective punch PWB. Replace the punch PWB and check for correct operation.

• Code: C8920
• Description: Backup memory data problem (optional mailbox of 3000-sheet document finisher) Read and write data does not match.
• Causes: Poor contact in the connector terminals. Defective mailbox main PWB.
• Remedy: Poor contact in the connector terminals. Check the connection of connector on the mailbox main PWB and the connector YC7 on the finisher main PWB, and the continuity across the connector terminals. Repair or replace if necessary. Defective mailbox main PWB. Replace the mailbox main PWB and check for correct operation.

• Code: C8930
• Description: Backup memory data problem (optional centerfold unit of 3000-sheet document finisher) Read and write data does not match.
• Causes: Poor contact in the connector terminals. Defective centerfold main PWB.
• Remedy: Poor contact in the connector terminals. Check the connection of connector on the centerfold main PWB and the connector YC5 on the finisher main PWB, and the continuity across the connector terminals. Repair or replace if necessary. Defective centerfold main PWB. Replace the centerfold main PWB and check for correct operation.

• Code: C9000
• Description: DP communication problem (optional DP) A communication error is detected.
• Causes: Poor contact in the connector terminals. Defective DP main PWB.
• Remedy: Poor contact in the connector terminals. Check the connection of connector YC7 on the scanner PWB and the connector of the DP, and the continuity across the connector terminals. Repair or replace if necessary. Defective DP main PWB. Replace the DP main PWB and check for correct operation.

• Code: C9040
• Description: DP lift motor going up error (optional DP) The pulse count raised to 10000 at lifting, however, the DP lift switch could not be turned on. After one time retry, the DP lift limit switch could not be turned on.
• Causes: Loose connection of the DP lift motor connector. Malfunction of the DP lift motor. Malfunction of the DP lift upper limit switch. Loose connection of the DP lift upper limit switch connector. Defective DP main PWB.
• Remedy: Loose connection of the DP lift motor connector. Reinsert the connector. Also check for continuity within the connector cable. If none, remedy or replace the cable. Malfunction of the DP lift motor. Replace the DP lift motor and check for correct operation. Malfunction of the DP lift upper limit switch. Replace the DP lift upper limit switch and check for correct operation. Loose connection of the DP lift upper limit switch connector. Reinsert the connector. Also check for continuity within the connector cable. If none, remedy or replace the cable. Defective DP main PWB. Replace the DP main PWB and check for correct operation.

• Code: C9050
• Description: DP lift motor going down error (optional DP) The pulse count lowered to 10000 at lifting down, however, the DP bottom limit switch could not be turned on. After one time retry, the DP bottom limit switch could not be turned on.
• Causes: Loose connection of the DP lift motor connector. Malfunction of the DP lift motor. Malfunction of the DP lift lower limit switch. Loose connection of the DP lift lower limit switch connector. Defective DP main PWB.
• Remedy: Loose connection of the DP lift motor connector. Reinsert the connector. Also check for continuity within the connector cable. If none, remedy or replace the cable. Malfunction of the DP lift motor. Replace the DP lift motor and check for correct operation. Malfunction of the DP lift lower limit switch. Replace the DP lift lower limit switch and check for correct operation. Loose connection of the DP lift lower limit switch connector. Reinsert the connector. Also check for continuity within the connector cable. If none, remedy or replace the cable. Defective DP main PWB. Replace the DP main PWB and check for correct operation.