• Code: 544
• Description: Fusing low temperature error
  A fusing temperature of lower than 100°C is detected for 1 second by the fusing thermistor during operation or stand-by mode.
• Causes: • Fusing lamp open • Fusing thermistor defective • Power supply board defective • Fusing thermistor open • Fusing thermostat open

• Code: 546
• Description: Unstable fusing temperature
  The fusing temperature does not rise 3 °C or more within 5 seconds after the fusing lamp has been on over 8 seconds.
• Causes: • Thermistor defective • Power supply unit defective

• Code: 547
• Description: Zero cross signal malfunction
  Zero cross signals are not detected within 5 seconds after the main power switch is turned on, or are not detected within 1 second after operation begins.
• Causes: • Power supply board defective • IOB defective • BiCU defective

• Code: 620
• Description: Communication error between IOB and ADF
  The IOB does not receive a response from the ADF main board for 4 seconds or more.
• Causes: • Poor connection between the IOB and ADF main board (DF connector) • ADF main board defective • IOB defective

• Code: 691
• Description: Communication error between BiCU and fax controller
  The BiCU board cannot communicate with the fax controller.
• Causes: • Poor connection between the BiCU board and the fax controller • BiCU board defective • Fax controller defective

• Code: 692
• Description: Communication error between BiCU and printer controller
  The BiCU board cannot communicate with the printer controller.
• Causes: • Poor connection between the BiCU board and the printer controller. • BiCU board defective • Printer controller defective

• Code: 695
• Description: Fax firmware error
  The fax program cannot be started.
• Causes: • The fax firmware download has not been completed correctly. Try again.

• Code: 760
• Description: ADF gate abnormal
  The ADF Gate signal line between the ADF main board and the IOB is disconnected.
• Causes: • ADF main board defective • Input/output board defective • Poor connection (ADF Gate line) between the ADF main board and the IOB.