Description: Heating belt low temperature error (1) The fusing unit thermistor in the middle of the unit has detected low temperature.
Causes: • Defective connection between engine control board (CN15) and fusing unit • Defective thermistor • Defective connection between fusing unit and thermistor • Pin 7 (CN32 on engine control board) unable to send signal • Defective IH unit or IH power supply board
Remedy: 5. Replace the IH unit or IH power supply board. 6. Connect the cable between the engine board and fusing unit correctly. 7. Replace the thermistor. 8. Connect the cable between fusing unit and thermistor correctly. 9. Replace the engine control board.
Code: 554
Description: Heating roller low temperature error (2) The fusing unit thermistor at the left end of the unit has detected much lower temperature than the other fusing unit thermistor does.
Causes: • Defective connection between engine control board (CN15) and fusing unit • Defective thermistor • Defective connection between fusing unit and thermistor • Pin 7 (CN32 on engine control board) unable to send signal • Defective IH unit or IH power supply board
Remedy: 5. Replace the IH unit or IH power supply board. 6. Connect the cable between the engine board and fusing unit correctly. 7. Replace the thermistor. 8. Connect the cable between fusing unit and thermistor correctly. 9. Replace the engine control board.
Code: 580
Description: Fusing belt rotation error The rotation of the fusing unit is not normal.
Causes: • Defective fusing belt, gear, or rotation plate • Defective connection between engine control board (CN15) and fusing unit • Defective connection of fusing unit connector • Pin 4 (CN15) unable to send 1.4-second (or less) encoder pulse
Remedy: 1. Replace the fusing unit. 2. Connect the cable between the engine control board (CN15) and fusing unit correctly. 3. Connect the fusing unit connector correctly. 4. Replace the engine control board.
Code: 581
Description: Fusing unit low voltage error The voltage applied to the fusing unit is out of the normal range.
Causes: • Defective IH power supply board • Defective thermostat
Remedy: 1. Replace the IH power supply board. 2. Replace the IH unit.
Code: 622
Description: Option paper unit communication error After the system starts, the communication with the paper tray is unexpectedly interrupted.
Causes: • Defective cable connection
Remedy: 1. Connect the cable to the paper tray correctly.
Code: 640
Description: Controller to engine communication error. Checksum error detected between the controller and the engine board.
Remedy: 1. Check the connection between the controller and the engine board. 2. Replace the engine board if the error is frequent. 3. Replace the controller board if the error is frequent.