• Code: 544
• Description: Fusing lamp overheat error 1 (hardware)
  The center thermistor or an end thermistor detected a temperature of 250°C on the hot roller.
• Causes: • PSU defective • IOB defective • BICU defective
• Remedy:

• Code: 545
• Description: Fusing lamp overheat error 2
  After hot roller reaches warmup temperature, the fusing lamps remained on at full capacity for 11 samplings (1.8 s. duration) while the hot roller was not rotating.
• Causes: • Thermistor damaged, or out of position • Fusing lamp disconnected
• Remedy:

• Code: 547
• Description: Zero cross signal malfunction
  One of the following conditions is detected 10 times: • When the main switch is on, the frequency measured by the number of zero cross signals for 500 ms is larger than 66Hz or smaller than 45 Hz. • The interval between one zero cross signal and the next is 7.5 ms or shorter 3 times consecutively for 500 ms.
• Causes: • Noise on the ac power line
• Remedy:

• 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
• Remedy:

• 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
• Remedy:

• 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 second. (at 0.1 s intervals).
• Causes: • PSU defective • IOB control board defective • BICU control board defective
• Remedy:

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

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