• Code: F040
• Description: Engine controller PWB communication error
  • The main controller PWB (KP-957) does not communicate to the engine controller PWB (KP-1054) normally.
• Causes: Defective engine controller PWB (KP-1054). Defective main controller PWB (KP-957).
• Remedy: Defective engine controller PWB (KP-1054). Replace the engine controller PWB (KP- 1054). Defective main controller PWB (KP-957). Replace the main controller PWB (KP-957).

• Code: F050
• Description: Engine controller PWB flash ROM error
  • Abnormality occurring in the flash ROM which is mounted on the engine controller PWB (KP-1054), the main controller PWB (KP-957) received notification.
• Causes: Defective engine controller PWB (KP-1054).
• Remedy: Defective engine controller PWB (KP-1054). Replace the engine controller PWB (KP- 1054).

• Code: m1
• Description: "Close top cover" display is not cancelled to closing the top cover.
• Causes:
• Remedy: Right edge of the top cover floating, it is not closed completely. Close the top cover securely. Defective top cover switch 2. Replace the top cover switch 2. Defective top cover/paper feed unit switch (SW701) of the sensor PWB (KP-982). Replace the sensor PWB (KP-982). Defective harness (S02846) between engine controller PWB (KP-1054) and top cover switch 2 or poor contact of the connector terminals. Check the continuity of the harness (S02846), check the connection YC11 connector of the engine controller PWB (KP-1054), if there is trouble, remedy or replace. Malfunctioning interlock rod that interfaces between the top cover and the top cover/ paper feed unit switch (SW701). Check to see if the interlock rod malfunctions. If it malfunctions, repair it. Defective engine controller PWB (KP-1054). Replace the engine controller PWB (KP-1054). Defective harness (S02849) between engine controller PWB (KP-1054) and sensor PWB (KP-982) or poor contact of the connector terminals. Check the continuity of the harness (S02849), check the connection YC2 connector of the engine controller PWB (KP-1054), check the connection YC701 and YC702 connectors of the sensor PWB (KP-982), if there is trouble, remedy or replace.

• Code: m2
• Description: "Close side cover" display is not cancelled to closing the top cover.
• Causes:
• Remedy: Defective side cover switch (SW702) of the sensor PWB (KP-982). Replace the sensor PWB (KP-982). The actuator of the side cover switch (SW702) of the sensor PWB (KP-982) is bent. Check the bending of the actuator of the side cover switch, if there is trouble, remedy or replace. Defective sensor PWB (KP- 982). Replace the sensor PWB (KP-982). Defective engine controller PWB (KP-1054). Replace the engine controller PWB (KP-1054). Defective harness (S02849) between engine controller PWB (KP-1054) and sensor PWB (KP-982) or poor contact of the connector terminals. Check the continuity of the harness (S02849), check the connection YC2 connector of the engine controller PWB (KP-1054), check the connection YC701 and YC702 connectors of the sensor PWB (KP-982), if there is trouble, remedy or replace.

• Code: m3
• Description: "Close paper transfer unit" display is not cancelled to closing the paper feed unit.
• Causes:
• Remedy: Defective top cover/paper feed unit switch (SW701) of the sensor PWB (KP-982). Replace the sensor PWB (KP-982). Malfunctioning interlock rod that interfaces between the top cover and the top cover/ paper feed unit switch (SW701). Check to see if the interlock rod malfunctions. If it malfunctions, repair it. Defective engine controller PWB (KP-1054). Replace the engine controller PWB (KP-1054). Defective harness (S02849) between engine controller PWB (KP-1054) and sensor PWB (KP-982) or poor contact of the connector terminals. Check the continuity of the harness (S02849), check the connection YC2 connector of the engine controller PWB (KP-1054), check the connection YC701 and YC702 connectors of the sensor PWB (KP-982), if there is trouble, remedy or replace.

• Code: m4
• Description: "Cassette 1 not loaded" display is not cancelled to closing the paper cassette.
• Causes:
• Remedy: Defective cassette size switch. Replace the cassette size switch. Defective sensor PWB (KP- 982). Replace the sensor PWB (KP-982). Defective harness (S02861) between cassette size switch and sensor PWB (KP-982) or poor contact of the connector terminals. Check the continuity of the harness (S02861), check the connection YC703 connector of sensor PWB (KP-982), if there is trouble, remedy or replace. Defective harness (S02849) between engine controller PWB (KP-1054) and sensor PWB (KP-982) or poor contact of the connector terminals. Check the continuity of the harness (S02849), check the connection YC2 connector of the engine controller PWB (KP-1054), check the connection YC701 and YC702 connectors of the sensor PWB (KP-982), if there is trouble, remedy or replace. Defective engine controller PWB (KP-1054). Replace the engine controller PWB (KP-1054).

• Code: m5
• Description: "Check waste toner box" display is not cancelled to replacing the waste toner box.
• Causes:
• Remedy: The waste toner full sensor or the waste toner full sensor [PWB] (KP-974) the sensor section is dirty. Replace the waste toner full sensor or the waste toner full sensor [PWB] (KP-974). Defective harness (S02863) between bias high voltage PWB (KP-980) and waste toner full sensor [PWB] (KP-974) or poor contact of the connector terminals. Check the continuity of the harness (S02863), check the connection of YC802 connector of the bias high voltage PWB (KP-980), check the connection of YC682 connector of the waste toner full sensor [PWB] (KP-974) if there is trouble, remedy or replace. Defective harness (S02862) between waste toner full sensor and waste toner full sensor [PWB] (KP-974) or poor contact of the connector terminals. Check the continuity of the harness (S02862), check the connection YC681 connector of the waste toner full sensor [PWB] (KP- 974), if there is trouble, remedy or replace. Defective engine controller PWB (KP-1054). Replace the engine controller PWB (KP-1054).

• Code: m6
• Description: The paper size is not recognized as the size set with the paper size dial.
• Causes:
• Remedy: Defective cassette size switch. Replace the cassette size switch. Defective sensor PWB (KP- 982). Replace the sensor PWB (KP-982). Defective harness (S02861) between cassette size switch and sensor PWB (KP-982) or poor contact of the connector terminals. Check the continuity of the harness (S02861), check the connection YC703 connector of sensor PWB (KP-982), if there is trouble, remedy or replace. Defective engine controller PWB (KP-1054). Replace the engine controller PWB (KP-1054).