• Code: 461
• Description: Humidity sensor error
  The output is 4.5 V (or higher) or 0.3 V (or lower) for 12 seconds.
• Causes: • Defective temp./ humidity sensor • Defective circuit • Defective connector

• Code: 480
• Description: ID sensor error
  The ID sensor is being calibrated (process control, step 1) → While the LED is off, the output voltage is 0.5 V or lower.
• Causes: • Defective ID sensor • Defective connector

• Code: 481
• Description: Transfer belt mark detection error
  • The main motor is operating; and the lock signal is detected. → The belt mark sensor signal does not change for 120 milliseconds.
• Causes: • Defective main motor • Image transfer belt out of position • Belt mark blurred or absent

• Code: 503
• Description: 3rd tray error
  • The tray lift motor turns on. → The top of the paper stack is not detected for 18 seconds. • The tray is set. → The top of the paper stack is detected. → The bottom plate is lowered. → The stack detection is not cleared within 7 seconds. → These steps are repeated 4 times.
• Causes: • Defective paper height sensor • Defective tray lift motor

• Code: 504
• Description: 4th tray error
  • The tray lift motor turns on. → The top of the paper stack is not detected for 18 seconds. • The tray is set. → The top of the paper stack is detected. → The bottom plate is lowered. → The stack detection is not cleared within 7 seconds. → These steps are repeated 4 times.
• Causes: • Defective paper height sensor • Defective tray lift motor

• Code: 515
• Description: Duplex unit communication error
  • A connection error occurs. • The signal is sent from the copier to the duplex unit every 3 seconds while paper is not transported by the unit. However, the duplex unit does not respond within 5 seconds.
• Causes: • Defective duplex unit board • Defective BICU • Defective Ex-IOB • Defective connection (Main unit Duplex unit)

• Code: 520
• Description: Fusing unit motor
  • The motor starts or changes speed. → The lock signal does not continue for 1 second within a 3second interval. • The motor starts. → The lock signal is detected and operation proceeds normally. → The lock signal is interrupted for 1 second.
• Causes: • Defective fusing unit motor

• Code: 521
• Description: Paper feed motor error
  • The motor starts or changes speed. → The lock signal does not continue for 1 second within a 3second interval. • The motor starts. → The lock signal is detected and operation proceeds normally. → The lock signal is interrupted for 1 second.
• Causes: • Defective paper feed motor