• Code: 6990
• Description: Fuser power supply incompatibility
  Information won’t match between the engine backup and the fuser IH PWB.
• Causes: Defective fuser IH PWB.
  Defective engine PWB.
• Remedy: Defective fuser IH PWB. Replace the fuser IH PWB and check for correct operation.
  Defective engine PWB. Replace the engine PWB and check for correct operation.

• Code: 7001
• Description: Toner motor K error
  A state in which the lock signal is detected for 20 times has been detected 3 times during the toner motor K is activated.
• Causes: Defective connector cable or poor contact in the connector.
  Defective screw sensor K.
  Defective toner motor K.
  Defective engine PWB.
• Remedy: Defective connector cable or poor contact in the connector. Reinsert the connector. Also check for continuity within the connector cable. If none, replace the cable. Toner motor K and engine PWB (YC27)
  Defective toner motor K. Replace the toner motor K.
  Defective engine PWB. Replace the engine PWB and check for correct operation.

• Code: 7002
• Description: Toner motor C error
  A state in which the lock signal is detected for 20 times has been detected 3 times during the toner motor C is activated.
• Causes: Defective connector cable or poor contact in the connector.
  Defective screw sensor C.
  Defective toner motor C.
  Defective engine PWB.
• Remedy: Defective connector cable or poor contact in the connector. Reinsert the connector. Also check for continuity within the connector cable. If none, replace the cable. Toner motor C and engine PWB (YC27)
  Defective toner motor C. Replace the toner motor C.
  Defective engine PWB. Replace the engine PWB and check for correct operation.

• Code: 7003
• Description: Toner motor M error
  A state in which the lock signal is detected for 20 times has been detected 3 times during the toner motor M is activated.
• Causes: Defective connector cable or poor contact in the connector.
  Defective screw sensor M.
  Defective toner motor M.
  Defective engine PWB.
• Remedy: Defective connector cable or poor contact in the connector. Reinsert the connector. Also check for continuity within the connector cable. If none, replace the cable. Toner motor M and engine PWB (YC27)
  Defective toner motor M. Replace the toner motor M.
  Defective engine PWB. Replace the engine PWB and check for correct operation.

• Code: 7004
• Description: Toner motor Y error A state in which the lock signal is detected for 20 times has been detected 3 times during the toner motor Y is activated.
• Causes: Defective connector cable or poor contact in the connector.
  Defective screw sensor Y.
  Defective toner motor Y.
  Defective engine PWB.
• Remedy: Defective connector cable or poor contact in the connector. Reinsert the connector. Also check for continuity within the connector cable. If none, replace the cable. Toner motor Y and engine PWB (YC27)
  Defective toner motor Y. Replace the toner motor Y.
  Defective engine PWB. Replace the engine PWB and check for correct operation.

• Code: 7101
• Description: Toner sensor K error
  Sensor output value of 60 or less or 944 or more continued for 3 s.
• Causes: Defective connector cable or poor contact in the connector.
  Defective engine PWB.
• Remedy: Defective connector cable or poor contact in the connector. Reinsert the connector. Also check for continuity within the connector cable. If none, replace the cable. Toner sensor K and front PWB (YC9) Front PWB (YC2) and engine PWB (YC10)
  Defective engine PWB. Replace the engine PWB and check for correct operation.

• Code: 7102
• Description: Toner sensor C error
  Sensor output value of 60 or less or 944 or more continued for 3 s.
• Causes: Defective connector cable or poor contact in the connector.
  Defective engine PWB.
• Remedy: Defective connector cable or poor contact in the connector. Reinsert the connector. Also check for continuity within the connector cable. If none, replace the cable. Toner sensor C and front PWB (YC13) Front PWB (YC2) and engine PWB (YC10)
  Defective engine PWB. Replace the engine PWB and check for correct operation.

• Code: 7103
• Description: Toner sensor M error
  Sensor output value of 60 or less or 944 or more continued for 3 s.
• Causes: Defective connector cable or poor contact in the connector.
  Defective engine PWB.
• Remedy: Defective connector cable or poor contact in the connector. Reinsert the connector. Also check for continuity within the connector cable. If none, replace the cable. Toner sensor M and front PWB (YC11) Front PWB (YC2) and engine PWB (YC10)
  Defective engine PWB. Replace the engine PWB and check for correct operation.