• Code: 515
• Description: Duplex unit communication error • A connection error occurs. • The signal is sent from the printer to the duplex unit every 3 seconds while paper is not transported by the unit. However, the duplex unit does not respond within 5 seconds.
• Causes: • Defective duplex unit board • Defective BCU • Defective IOB • Defective connection (Main unit - Duplex unit)

• Code: 520
• Description: Paper feed motor error . The motor starts or changes speed. - The lock signal does not continue for 1 second within a 3-second interval. . The motor starts. - The lock signal is detected and operation proceeds normally. - The lock signal is interrupted for 1 second.
• Causes: • Defective paper feed motor

• Code: 541
• Description: Thermistor disconnection (heating roller) The fusing unit starts warm up to the print ready temperature. - The temperature does not reach 7‹C for 10 seconds.
• Causes: • Defective thermistor • Thermistor loose connection • Defective connector

• Code: 542
• Description: Fusing warm-up timeout (heating roller) The main switch is turned on or a cover is closed. - The heating roller does not reach the warm-up temperature within 50 seconds.
• Causes: • Defective lamp (loose connection, thermostat failure, PSU, thermostat) • Incorrect detection (loose thermistor connection, fusing - drawer loose connection)

• Code: 543
• Description: Overheat error (heating roller) The heating roller thermistor detects 220°C for 5 seconds.
• Causes: • Short circuit • Defective BCU board • Defective PSU

• Code: 544
• Description: Low temperature error (heating roller) During standby or operation, the heating roller thermistor detects 100 °C or less for 5 seconds.
• Causes: • Defective lamp (loose connection, thermostat failure, PSU, thermostat) • Incorrect detection (loose thermistor connection, fusing - drawer loose connection)

• Code: 545
• Description: Full power error (heating roller) Fusing unit warm-up is complete. - The heating roller stops turning. - The heating roller lamp keeps outputting the maximum power for 30 seconds.
• Causes: • Thermistor loose connection • Fusing - drawer loose connection

• Code: 546
• Description: Unstable temperature (heating roller) • The heating roller thermistor detects unstable temperature increases or decreases within 60 seconds.
• Causes: • Thermistor loose connection • Fusing - drawer loose connection