• Code: 0300
• Description: Polygon motor malfunction
  • The polygon motor does not rotate evenly even after the lapse of a given period of time after it has been started. • The motor lock signal remains HIGH for a given period of consecutive time while the polygon motor is being rotated.
• Remedy: 1 Check the cable and connector for proper connection and correct as necessary. 2 Change PH unit. 3 Change PRCB.

• Code: 0310
• Description: Laser malfunction
  • The SOS signal is not detected within a given period of time after the output of the laser has been started.
• Remedy: 1 Check the cable and connector for proper connection and correct as necessary. 2 Change PH unit. 3 Change PRCB.

• Code: 0500
• Description: Fuser warm-up failure
  • The thermistor /1 does not detect the specified temperature and the warm-up cycle is not completed even after the lapse of a given period of time after the cycle has been started.
• Remedy: 1 Change fuser unit. 2 1. Main switch is turned ON. 2. Open the top cover. 3. Press the following ten keys in this order 2-6-2-3-7. 4. Main switch is turned OFF/ON. 3 Change PRCB. 4 Change DCPU.

• Code: 0502
• Description: Thermistor open-circuit failure
  • The temperature detected by the thermistor does not reach a predetermined level even after the lapse of a given period time after the warm-up cycle has been started.
• 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: 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 Change fuser unit. 2 1. Main switch is turned ON. 2. Open the top cover. 3. Press the following ten keys in this order 2-6-2-3-7. 4. Main switch is turned OFF/ON. 3 Change PRCB. 4 Change DCPU.

• Code: 0510
• Description: Abnormally low fuser 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 fuser 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 home sensor abnormalities
• 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 M101 connector for proper connection and correct as necessary. 3 Check M101 for proper drive coupling and correct as necessary. 4 Check the PRCB connector for proper connection and correct as necessary. 5 M101 operation check. MFPB P2-1 to 4 1680MF: J-12 1690MF: J-6. 6 Change PRCB. 7 Change DCPU.