• Code: 0503
• Description: Thermistor resistance failure • The difference between the temperature detected by thermistor/1 and that detected by thermistor/2 exceeds a predetermined value.
• Remedy: 1 Check the fuser unit for correct installation (whether it is secured in position). 2 Check the fuser unit, DCPU, and PRCB for proper connection and correct as necessary. 3 Change fuser unit. 4 Change PRCB. 5 Change DCPU.

• Code: 0510
• Description: Abnormally low heating roller temperature • The temperature detected by the thermistor /1 remains lower than the specified value for a given period of time or longer.
• Remedy: 1 Check the fuser unit for correct installation (whether it is secured in position). 2 Check the fuser unit, DCPU, and PRCB for proper connection and correct as necessary. 3 Change fuser unit. 4 Change PRCB. 5 Change DCPU.

• Code: 0520
• Description: Abnormally high heating roller temperature • The temperature detected by the thermistor /1 remains higher than the specified value for a given period of time or longer. • The heater lamp remains ON for a given period of time or longer.
• Remedy: 1 Check the fuser unit for correct installation (whether it is secured in position). 2 Check the fuser unit, DCPU, and PRCB for proper connection and correct as necessary. 3 Change fuser unit. 4 Change PRCB. 5 Change DCPU.

• Code: 0650
• Description: SCANNER MOTION ERROR CHECK SCANNER LOCK Scanner home sensor abnormalities • A low motor lock signal is not detected even after the lapse of a predetermined period of time after the polygon motor has been started. • The motor lock signal remains HIGH for a predetermined consecutive period of time while the polygon motor remains energized.
• Remedy: 1 Check to see if the lock lever of the Scanner unit is unlocked and unlock the lock lever if it is locked. 2 Check the M100 connector for proper connection and correct as necessary. 3 Check M100 for proper drive coupling and correct as necessary. 4 Check the PRCB connector for proper connection and correct as necessary. 5 M100 operation check. 6 Change PRCB. 7 Change DCPU.

• Code: 0F50
• Description: OHP sensor malfunction • It is determined that the OHP sensor is faulty through a check made at the end of the predrive.
• Remedy: 1 Check the PRCB connector for proper connection and correct as necessary. 2 PS7 sensor check. 3 Change PRCB.

• Code: 0F52
• Description: Toner level sensor /Y malfunction • An error occurs on the toner level sensor board (TLSB).
• Remedy: 1 Check the cable and connector for proper connection and correct as necessary. 2 Change TLSB. 3 Change PRCB.

• Code: 0F53
• Description: Toner level sensor / M malfunction • An error occurs on the toner level sensor board (TLSB).
• Remedy: 1 Check the cable and connector for proper connection and correct as necessary. 2 Change TLSB. 3 Change PRCB.

• Code: 0F54
• Description: Toner level sensor /C malfunction • An error occurs on the toner level sensor board (TLSB).
• Remedy: 1 Check the cable and connector for proper connection and correct as necessary. 2 Change TLSB. 3 Change PRCB.