• Code: 546
• Description: Unstable fusing temperature
  While the fusing lamp is on, the fusing temperature varies 50°C or more within one second; and this occurs two consecutive times.
• Causes: • Defective thermistor
  • Incorrect installation of the thermistor
  • Defective power supply unit

• Code: 547
• Description: Zero cross signal malfunction
  The zero cross signal is not detected within five seconds after the main power switch is turned on. Or, the zero cross signal is not detected within one second after operation begins.
• Causes: • Defective power supply unit
  • Defective BICU

• Code: 559
• Description: Consecutive fusing jam
  The paper jam counter for the fusing unit reaches 3 times. The paper jam counter is cleared if the paper is fed correctly. This SC is activated only when SP1159-001 is set to "1" (default "0").
• Causes: • Paper jam in the fusing unit.

• Code: 590
• Description: Exhaust fan motor error
  The exhaust fan motor is locked for five seconds.
• Causes: • Loose connection of the exhaust fan motor
  • Overload

• Code: 630
• Description: CSS communication error
  The machine tries to communicate with one of the terminals of a relevant service center. An error signal returns.
• Causes: • Communication error on the public telephone network (logged only; the machine can still operate)

• Code: 632
• Description: MF accounting device error 1
  The machine sends a data frame. No normal end signal returns. This symptom happens three times.
• Causes: • Defective or broken line between machine and device

• Code: 633
• Description: MF accounting device error 2
  The machine is communicating with the accounting device. The break signal returns.
• Causes: • Defective or broken line between machine and device

• Code: 634
• Description: MF accounting device error 3
  A backup RAM error is reported from the accounting device.
• Causes: • Defective accounting device controller • Defective battery in the accounting device