• Code: 552
• Description: Fusing temperature warm-up error (end)
  This SC is generated if the following condition occurs:
  • The thermistor (end) does not detect an 8°C increment in the fusing temperature for 7.5 sec. just after the fusing temperature reached 45 °C.
  • The temperature of the end thermistor does not reach the target temperature for 31 seconds after the fusing lamps turned on.
• Causes: • Thermistor warped or broken

• Code: 553
• Description: Fusing overheat error 1 (software detection)
  A fusing temperature (at the end) of over 230 °C (446 °F) is detected for 1 second by the fusing thermistors at the center or at either end of the fusing roller.
• Causes: • Power supply unit defective • I/O board (IOB) defective • BICU defective • TRIAC short on PSU (PSU defective)

• Code: 554
• Description: Fusing overheat error 1 (hardware detection)
  A fusing temperature (at the end) over 250 °C is detected by the fusing temperature monitor circuit in the BICU board.
• Causes: • I/O board (IOB) defective • BICU defective

• Code: 555
• Description: Fusing lamp consecutive full power 1
  After warm-up, the fusing lamp remains at full power for 15 seconds without the hot roller rotating.
• Causes: • Disconnected or defective thermistors (ends) • Defective fusing lamp

• Code: 557
• Description: Zero cross frequency error
  When the zero cross signal is 66 or more and it is detected 10 times or more in 11 detections, the machine determines that input 60 Hz and SC557 occurs.
• Causes: • Noise (High frequency)

• Code: 559
• Description: Fusing unit jam
  The fusing sensor detected a fusing unit paper late jam three times. The paper was late and the fusing exit sensor could not detect the paper three times.
• Causes: • Remove the paper that is stopped in the fusing unit. • Check that the fusing unit is clean and has no obstacles in the paper feed path. • If the error persists, replace the fusing unit.

• Code: 610
• Description: Mechanical counter error: BK
  This SC is only for NA models. The machine detects the mechanical counter error when SP5987-001 is set to "1".
• Causes: • Disconnected mechanical counter • Defective mechanical counter

• Code: 620
• Description: Communication error between IOB and ADF
  After the ARDF is detected, the break signal occurs or communication timeout occurs.
• Causes: • Incorrect installation of ARDF • ARDF defective • IOB board defective • External noise