• Code: 510
• Description: LCT lower limit error
  The lower limit sensor does not activate within 8 seconds after the tray has been lowered.
• Causes: • Tray lift motor defective • Poor connection of the tray lift motor • Lower limit sensor defective • Too much load on the drive mechanism

• Code: 520
• Description: Paper tray error
  An error occurs (i.e motor error, or sensor error, etc) for any paper tray.
• Causes: • A defective motor • A defective sensor • Too much load on the drive mechanism

• Code: 541
• Description: Fusing thermistor open
  The fusing temperature detected by the thermistor was below 0 °C for 5 seconds. The fusing temperature does not rise +15 °C (center) or +12 °C (at the ends) five times within 2 minutes after the fusing lamps have been turned on.
• Causes: • Fusing thermistor defective or out of position • Fusing lamp open • Fusing thermostat open • Power supply board defective • Poor connection of the fusing unit

• Code: 542
• Description: Fusing temperature warm-up error
  The fusing temperature does not reach the standby temperature within 20 seconds after the main switch is turned on.
• Causes: • Fusing thermistor defective or out of position • Fusing lamp open • Fusing thermostat open • Power supply board defective • Poor connection of the fusing unit

• Code: 543
• Description: Fusing overheat error 1
  A fusing temperature of over 231°C is detected for 5 second by the fusing thermistor.
• Causes: • Fusing thermistor defective • Power supply board defective • SBCU board defective

• Code: 544
• Description: Fusing overheat error 2
  A fusing temperature of over 251°C is detected by the fusing temperature monitor circuit in the SBCU board.
• Causes: • Fusing thermistor defective • Power supply board defective • SBCU board defective

• Code: 545
• Description: Fusing overheat error 3
  After warmup, the hot roller attained full operating temperature and maintained this temperature for 10 sec. without the hot roller rotating.
• Causes: • Hot roller thermistor is out of position • Fusing lamp broken • Thermostat broken

• Code: 546
• Description: Unstable fusing temperature
  The fusing temperature varies 50°C or more within 1 second twice continuously.
• Causes: • Thermistor defective • Poor connection of the fusing unit • Power supply unit defective