• Code: 551
• Description: Fusing thermistor error 1
  The end thermistor (contact type) was less than 0C (32F) for more than 7 seconds.
• Causes: • Thermistor disconnected • Thermistor connector defective

• Code: 552
• Description: Fusing thermistor error 2
  The end thermistor (contact type) could not detect: 100°C 25 seconds after the start of the warmup cycle. A change in temperature more than than 16 degrees for 5 seconds. The reload temperature with 56 seconds after the start of the fusing temperature control cycle.
• Causes: • Fusing lamp disconnected • Thermistor bent, damaged • Thermistor position incorrect

• Code: 553
• Description: Fusing thermistor error 3
  The end thermistor (contact type) was at 240°C (464°F) for more than 1 second. The temperature is read 10 times every sec. (at 0.1 sec. intervals).
• Causes: • PSU defective • IOB control board defective • BICU control board defective`

• Code: 555
• Description: Fusing lamp error
  After the start of the warmup cycle, a fusing lamp was at full power for 1.8 seconds but the hot roller did not turn.
• Causes: • Thermistor bent, out of position • Fusing lamp disconnected • Circuit breaker opened

• Code: 557
• Description: Zero cross signal error
  High frequency noise was detected on the power line.
• Causes: • No action required. The SC code is logged and the operation of the machine is not affected.

• Code: 559
• Description: Fusing jam: 3 counts
  At the fusing exit sensor the paper was detected late for three pulse counts (lag error), and SP1159 was on.
• Causes: • If this SC occurs, the machine cannot be used until the service technician cancels the SC code. • This SC does occurs only if SP1159 has been set to "1" (On). (Default: 0 (Off)).

• Code: 569
• Description: Fusing pressure release motor error
  During copying, the HP sensor could not detect the actuator, tried again 3 times and could not detect.
• Causes: • Motor lock because of too much load • Motor driver defective • HP sensor defective, disconnected, connector defective, harness damaged

• Code: 590
• Description: Toner collection motor error
  The toner collection motor sensor output does not change for 3 seconds while the toner collection motor is on.
• Causes: • Motor lock due to obstruction • Motor driver board defective • Motor connection loose, defective • Toner collection motor sensor disconnected, sensor defective • Rotational transmission shaft (o6 x 30) missing