• Code: SC541
• Description: Fusing thermistor open
  The fusing temperature detected by the thermistor is below 7°C for 35 seconds.
• Causes: • Fusing thermistor defective or out of position • Poor thermistor terminal connection

• Code: SC542
• Description: Fusing temperature warming-up error
  The fusing temperature does not reach the fusing standby temperature within 5 minutes after the main power switch is turned on.
• Causes: • Fusing thermistor defective or out of position • Fusing lamp open • Fusing thermofuse open • BICU defective • Power supply board defective • Poor fusing unit connection

• Code: SC543
• Description: Fusing overheat error 1 (software)
  A fusing temperature of over 230°C is detected for 5 seconds by the fusing thermistor.
• Causes: • Fusing thermistor defective • BICU defective • I/O board (IOB) defective

• Code: SC544
• Description: Fusing overheat error 1 (hardware)
  The BICU detects an overheat error even if the protection in the software does not work.
• Causes: • Fusing thermistor defective • BICU defective • I/O board defective

• Code: SC545
• Description: Fusing overheat error 2
  The fusing lamp stays on at full power for 45 seconds while in the stand-by condition after warming-up is completed.
• Causes: • Fusing thermistor out of position

• Code: SC546
• Description: Fusing ready temperature malfunction
  • A change in the fusing temperature by 20°C or more compared with the temperature of 1 second ago occurs 2 times consecutively. • A change in the fusing temperature by 20°C or more compared with the temperature of 1 second ago occurs 3 times consecutively for 1 minute.
• Causes: • Poor connection on the thermistor • Poor connection on the fusing unit connector

• Code: SC547
• Description: Zero cross signal malfunction
  • 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 45Hz. • It is measured 3 times consecutively for 500 ms that the interval between a zero cross signal and the next one is 7.5 ms or shorter.
• Causes: • Power supply unit defective • Noise on the ac power line

• Code: SC590
• 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: • Toner collection motor defective • Too much load on the drive mechanism • Poor toner collection motor connector connection • IOB defective • Toner collection motor sensor defective