• 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 toner sensor C. Failure of locking the developer waste slot at setup. 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 toner sensor C. Replace developer unit C.
  Failure of locking the developer waste slot at setup. Check whether the developer waste slot has been unlocked and unlock if necessary.
  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 toner sensor M. Failure of locking the developer waste slot at setup. 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 toner sensor M. Replace developer unit M.
  Failure of locking the developer waste slot at setup. Check whether the developer waste slot has been unlocked and unlock if necessary.
  Defective engine PWB. Replace the engine PWB and check for correct operation.

• Code: 7104
• Description: Toner sensor Y 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 toner sensor Y. Failure of locking the developer waste slot at setup. 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 Y and front PWB (YC15) Front PWB (YC2) and engine PWB (YC10)
  Defective toner sensor Y. Replace developer unit Y.
  Failure of locking the developer waste slot at setup. Check whether the developer waste slot has been unlocked and unlock if necessary.
  Defective engine PWB. Replace the engine PWB and check for correct operation.

• Code: 7200
• Description: Broken outer temperature sensor 2 wire
  The sensor input sampling is greater than 230.
• Causes: Defective connector cable or poor contact in the connector. Defective outer temperature sensor 2. 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. Outer temperature sensor 2 and front PWB (YC19) Front PWB (YC2) and engine PWB (YC10)
  Defective outer temperature sensor 2. Replace outer temperature sensor 2.
  Defective engine PWB. Replace the engine PWB and check for correct operation.

• Code: 7210
• Description: Short-circuited outer temperature sensor 2
  The sensor input sampling is less than 69.
• Causes: Defective connector cable or poor contact in the connector. Defective outer temperature sensor 2. efective 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. Outer temperature sensor 2 and front PWB (YC19) Front PWB (YC2) and engine PWB (YC10)
  Defective outer temperature sensor 2. Replace outer temperature sensor 2.
  Defective engine PWB. Replace the engine PWB and check for correct operation.

• Code: 7221
• Description: Broken LSU thermistor K wire
  The sensor input sampling is greater than 230.
• Causes: Defective connector cable or poor contact in the connector. Defective LSU thermistor 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. Laser scanner unit and LSU relay PWB (YC5) LSU relay PWB (YC3) and engine PWB (YC12)
  Defective LSU thermistor K. Replace the laser scanner unit.
  Defective engine PWB. Replace the engine PWB and check for correct operation.

• Code: 7222
• Description: Broken LSU thermistor C wire
  The sensor input sampling is greater than 230.
• Causes: Defective connector cable or poor contact in the connector. Defective LSU thermistor 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. Laser scanner unit and LSU relay PWB (YC10) LSU relay PWB (YC3) and engine PWB (YC12)
  Defective LSU thermistor C. Replace the laser scanner unit.
  Defective engine PWB. Replace the engine PWB and check for correct operation.

• Code: 7223
• Description: Broken LSU thermistor M wire The sensor input sampling is greater than 230.
• Causes: Defective connector cable or poor contact in the connector. Defective LSU 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. Laser scanner unit and LSU relay PWB (YC8) LSU relay PWB (YC3) and engine PWB (YC12)
  Defective LSU thermistor M. Replace the laser scanner unit.
  Defective engine PWB. Replace the engine PWB and check for correct operation.