• Code: 7253
• Description: Short-circuited developer thermistor M
  The sensor input sampling is less than 69.
• Causes: Defective connector cable or poor contact in the connector
  Defective developer thermistor 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. Developer unit M and front PWB (YC11) Front PWB (YC2) and engine PWB (YC10)
  Defective developer thermistor M. Replace developer unit M.
  Defective engine PWB. Replace the engine PWB and check for correct operation.

• Code: 7254
• Description: Short-circuited developer thermistor Y wire
  The sensor input sampling is less than 69.
• Causes: Defective connector cable or poor contact in the connector.
  Defective developer thermistor 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. Developer unit Y and front PWB (YC15) Front PWB (YC2) and engine PWB (YC10)
  Defective developer thermistor Y. Replace developer unit Y.
  Defective engine PWB. Replace the engine PWB and check for correct operation.

• Code: 7401
• Description: Developer unit K type mismatch error
  Absence of the developer unit K is detected.
• Causes: Defective connector cable or poor contact in the connector.
  Different type of the developer unit is installed.
• 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. Developer unit K and front PWB (YC9) Front PWB (YC2) and engine PWB (YC10)
  Different type of the developer unit is installed. Install the correct developer unit.

• Code: 7402
• Description: Developer unit C type mismatch error
  Absence of the developer unit C is detected.
• Causes: Defective connector cable or poor contact in the connector.
  Different type of the developer unit is installed.
• 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. Developer unit C and front PWB (YC13) Front PWB (YC2) and engine PWB (YC10)
  Different type of the developer unit is installed. Install the correct developer unit.

• Code: 7403
• Description: Developer unit M type mismatch error
  Absence of the developer unit M is detected.
• Causes: Defective connector cable or poor contact in the connector
  Different type of the developer unit is installed
• 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. Developer unit M and front PWB (YC11) Front PWB (YC2) and engine PWB (YC10)
  Different type of the developer unit is installed. Install the correct developer unit.

• Code: 7404
• Description: Developer unit Y type mismatch error
  Absence of the developer unit Y is detected.
• Causes: Defective connector cable or poor contact in the connector.
  Different type of the developer unit is installed.
• 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. Developer unit Y and front PWB (YC15) Front PWB (YC2) and engine PWB (YC10)
  Different type of the developer unit is installed. Install the correct developer unit.

• Code: 7601
• Description: ID sensor 1 error
  An abnormal value is detected in the input data to ID sensor 1.
• 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. ID sensor 1 and feed PWB 1 (YC10) Feed PWB 1 (YC1) and engine PWB (YC6)
  Defective engine PWB. Replace the engine PWB and check for correct operation.

• Code: 7602
• Description: ID sensor 2 error
  An abnormal value is detected in the input data to ID sensor 2.
• 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. ID sensor 2 and feed PWB 1 (YC10) Feed PWB 1 (YC1) and engine PWB (YC6)
  Defective engine PWB. Replace the engine PWB and check for correct operation.