• Code: 0500
• Description: Fuser warm-up failure
• Causes: Fuser unit Printer control board (PRCB) DC power supply (DCPU)
• Remedy: 1 Change fuser unit. 2 1. Main switch is turned ON. 2. Open the top cover. 3. Press the following keys in this order. Clear key Rotate Toner key Clear key Rotate Toner key. 4. Main switch is turned OFF/ON. 3 Change PRCB. 4 Change DCPU.

• Code: 0502
• Description: Thermistor open-circuit failure
• Causes: Fuser unit Printer control board (PRCB) DC power supply (DCPU)
• 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
• Causes: Fuser unit Printer control board (PRCB) DC power supply (DCPU)
• Remedy: 1 Change fuser unit. 2 1. Main switch is turned ON. 2. Open the top cover. 3. Press the following keys in this order. Clear key Rotate Toner key Clear key Rotate Toner key. 4. Main switch is turned OFF/ON. 3 Change PRCB. 4 Change DCPU.

• Code: 0510
• Description: Abnormally low fuser temperature
• Causes: Fuser unit Printer control board (PRCB) DC power supply (DCPU)
• 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
• Causes: Fuser unit Printer control board (PRCB) DC power supply (DCPU)
• 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: 0F51
• Description: Waste toner full sensor trouble
• Causes: Waste toner full sensor (PS7) Printer control board (PRCB)
• Remedy: 1 Check the PRCB connector for proper connection and correct as necessary. 2 PS7 sensor check. 3 Change PRCB.

• Code: 13C0
• Description: Printer control board malfunction
• Causes: Printer control board (PRCB)
• Remedy: 1 Check the PRCB connector for proper connection and correct as necessary. 2 Change PRCB.

• Code: 13DD
• Description: Backup data error
• Causes: Printer control board (PRCB)
• Remedy: 1 Confirm mounting status of EEPROM on the printer control board, and make modification if necessary. 2 Change PRCB.