• Code: 7412
• Description: Cyan drum unit non- installing error
  • The EEPROM (U401) on the drum PWB 2 (KP-972) inside the cyan drum unit does not communicate normally.
• Causes: Defective harness between drum PWB 2 (KP-972) and printer main unit or poor contact of the connector terminals. Defective drum PWB 2 (KP-972). Defective engine controller PWB (KP-1054). Defective LED print heads relay PWB (KP-1048). Defective harness (S02869) between engine controller PWB (KP-1054) and LED print heads relay PWB (KP-1048) or poor contact of the connector terminals.
• Remedy: Defective harness between drum PWB 2 (KP-972) and printer main unit or poor contact of the connector terminals. Check the connection of the cyan drum unit and the printer main unit, check the continuity of the harness (S02867), if there is trouble, remedy or replace. Defective drum PWB 2 (KP-972). Replace the drum PWB 2 (KP-972). Defective engine controller PWB (KP-1054). Replace the engine controller PWB (KP- 1054). Defective LED print heads relay PWB (KP-1048). Replace the LED print heads relay PWB (KP-1048). Defective harness (S02869) between engine controller PWB (KP-1054) and LED print heads relay PWB (KP-1048) or poor contact of the connector terminals. Check the continuity of the harness (S02869), check the connection YC3 connector of the engine controller PWB (KP- 1054), if there is trouble, remedy or replace.

• Code: 7413
• Description: Magenta drum unit non- installing error
  • The EEPROM (U401) on the drum PWB 1 (KP-972) inside the magenta drum unit does not communicate normally.
• Causes: Defective harness between drum PWB 1 (KP-972) and printer main unit or poor contact of the connector terminals. Defective drum PWB 1 (KP-972). Defective engine controller PWB (KP-1054). Defective LED print heads relay PWB (KP-1048). Defective harness (S02869) between engine controller PWB (KP-1054) and LED print heads relay PWB (KP-1048) or poor contact of the connector terminals.
• Remedy: Defective harness between drum PWB 1 (KP-972) and printer main unit or poor contact of the connector terminals. Check the connection of the magenta drum unit and the printer main unit, check the continuity of the harness (S02867), if there is trouble, remedy or replace. Defective drum PWB 1 (KP-972). Replace the drum PWB 1 (KP-972). Defective engine controller PWB (KP-1054). Replace the engine controller PWB (KP- 1054). Defective LED print heads relay PWB (KP-1048). Replace the LED print heads relay PWB (KP-1048). Defective harness (S02869) between engine controller PWB (KP-1054) and LED print heads relay PWB (KP-1048) or poor contact of the connector terminals. Check the continuity of the harness (S02869), check the connection YC3 connector of the engine controller PWB (KP- 1054), if there is trouble, remedy or replace.

• Code: 7414
• Description: Yellow drum unit non- installing error
  • The EEPROM (U401) on the drum PWB 3 (KP-972) inside the yellow drum unit does not communicate normally.
• Causes: Defective harness between drum PWB 3 (KP-972) and printer main unit or poor contact of the connector terminals. Defective drum PWB 3 (KP-972). Defective LED print heads relay PWB (KP-1048). Defective LED print heads relay PWB (KP-1048). Defective harness (S02869) between engine controller PWB (KP-1054) and LED print heads relay PWB (KP-1048) or poor contact of the connector terminals.
• Remedy: Defective harness between drum PWB 3 (KP-972) and printer main unit or poor contact of the connector terminals. Check the connection of the magenta drum unit and the printer main unit, check the continuity of the harness (S02867), if there is trouble, remedy or replace. Defective drum PWB 3 (KP-972). Replace the drum PWB 3 (KP-972). Defective LED print heads relay PWB (KP-1048). Replace the engine controller PWB (KP- 1054). Defective LED print heads relay PWB (KP-1048). Replace the LED print heads relay PWB (KP-1048). Defective harness (S02869) between engine controller PWB (KP-1054) and LED print heads relay PWB (KP-1048) or poor contact of the connector terminals. Check the continuity of the harness (S02869), check the connection YC3 connector of the engine controller PWB (KP- 1054), if there is trouble, remedy or replace.

• Code: 7600
• Description: Toner ID sensor error
  • The detection signal of the toner ID sensor was abnormal value.
• Causes: Defective toner ID sensor. Defective engine controller PWB (KP-1054). Defective harness (S02865) between engine controller PWB (KP-1054) and toner ID sensor or poor contact of the connector terminals.
• Remedy: Defective toner ID sensor. Replace the toner ID sensor. Defective engine controller PWB (KP-1054). Replace the engine controller PWB (KP- 1054). Defective harness (S02865) between engine controller PWB (KP-1054) and toner ID sensor or poor contact of the connector terminals. Check the continuity of the harness (S02865), check the connection YC11 connector of the engine controller PWB (KP- 1054), if there is trouble, remedy or replace.

• Code: F000
• Description: Operation panel PWB communication error
  • The operation panel PWB (KP-962) does not communicate to the main controller PWB (KP-957) normally 30 seconds.
• Causes: Defective main controller PWB (KP-957). Defective operation panel PWB (KP- 962).
• Remedy: Defective main controller PWB (KP-957). Replace the main controller PWB (KP-957). Defective operation panel PWB (KP- 962). Replace the operation panel PWB (KP-962).

• Code: F010
• Description: System DIMM PWB checksum error
  • The system DIMM PWB (KP-893) which stores the program checksum did not coincide.
• Causes: Defective system DIMM PWB (KP- 893). Defective main controller PWB (KP-957).
• Remedy: Defective system DIMM PWB (KP- 893). Replace the system DIMM PWB (KP-893). Defective main controller PWB (KP-957). Replace the main controller PWB (KP-957).

• Code: F020
• Description: Main controller PWB memory check error
  • It could not access to the standard memory or the optional expanding memory which are mounted on the main PWB (KP-957) normally.
• Causes: Defective main controller PWB (KP-957). Defective expanding memory.
• Remedy: Defective main controller PWB (KP-957). Replace the main controller PWB (KP- 1054). Defective expanding memory. If the expanding memory is installed, after removing or replacing the expanding memory, do the operation check. If operation is normal, replace the expanding memory.

• Code: F030
• Description: Main controller PWB system error
  • The error which is related to the system other than the error code F0 (F010) and F020 occurred.
• Causes: Defective main controller PWB (KP-957).
• Remedy: Defective main controller PWB (KP-957). Replace the main controller PWB (KP- 1054).