• Code: 471
• Description: Transfer belt H.P. error
  The transfer belt HP sensor signal does not change from Low to High (home position) or vice versa 1 second after the transfer belt contact motor turns on.
• Causes: • Transfer belt unit not set properly • Defective transfer belt H.P. sensor and/or transfer belt sensor • Defective transfer belt contact motor • Transfer belt unit problem

• Code: 481
• Description: Waste toner vibrator error
  The waste toner vibrator does not operate.
• Causes: • Loose connector • Defective motor

• Code: 490
• Description: Transfer bias / paper attraction roller bias leak error
  The high voltage supply board - Transfer monitors the circuit and detects current leaks. If this happens, the high voltage supply board sends a SC signal (High to Low at CN2138) to the BCU. The BCU monitors this signal every 2 ms and generates this SC code when the error condition occurs 250 consecutive times.
• Causes: • Defective high voltage supply board - Transfer • Damaged transfer belt • Transfer unit • Damaged highvoltage supply cables • Damaged cables between the BCU and high voltage supply board • Defective BCU

• Code: 501
• Description: Paper Tray 1 error
  When the tray lift motor is turned on, if the upper limit is not detected within 10 seconds, the machine asks the user to reset the tray. If this condition occurs three consecutive times, the SC is generated.
• Causes: • Defective paper lift sensor • Defective tray lift motor • Defective bottom plate lift mechanism

• Code: 502
• Description: Paper Tray 2 error
  When the tray lift motor is turned on, if the upper limit is not detected within 10 seconds, the machine asks the user to reset the tray. If this condition occurs three consecutive times, the SC is generated.
• Causes: • Defective paper lift sensor • Defective tray lift motor • Defective bottom plate lift mechanism

• Code: 503-01
• Description: Tray 3 error (Paper Feed Unit or LCT)
  For the paper feed unit: When the tray lift motor is turned on, if the upper limit is not detected within 18 seconds, the machine asks the user to reset the tray. If this condition occurs three consecutive times, the SC is generated. For the LCT: This SC is generated under the following conditions: • If the upper or lower limit is not detected within 15 seconds when the tray lift motor is turned on to lift up or lower the tray • If the paper stack is not transported within a specific number of pulses after the tray motor and stack transport clutch turn on to transport the paper stack • If the end fence home position sensor stays ON for a specific number of pulses after the tray motor and stack transport clutch turn on to transport the paper stack.
• Causes: For the paper feed unit: • Defective tray lift motor or connector disconnection • Defective lift sensor or connector disconnection For the LCT: • Defective stack transport clutch or connector disconnection • Defective tray motor or connector disconnection • Defective end fence home position sensor or connector disconnection • Defective upper limit sensor or connector disconnection • Defective tray lift motor or connector disconnection

• Code: 503-02
• Description: Tray 3 error (Paper Feed Unit or LCT)
  • If the following condition occurs 3 consecutive times, this SC is generated. For the paper feed unit: When the main switch is turned or when the tray is set and if the upper limit is already detected, the lift motor turns on to lower the bottom plate until the lift sensor goes off. If the motor turns on for 7 seconds or more, the machine asks the user to reset the tray. For the LCT: When the main switch is turned on or when the LCT is set, if the end fence is not in the home position (home position sensor ON), the tray lift motor stops.
• Causes: For the paper feed unit: • Defective tray lift motor or connector disconnection • Defective lift sensor or connector disconnection For the LCT: • Defective stack transport clutch or connector disconnection • Defective tray motor or connector disconnection • Defective end fence home position sensor or connector disconnection

• Code: 504-01
• Description: Tray 4 error (3 Tray Paper Feed Unit)
  When the tray lift motor is turned on, if the upper limit is not detected within 18 seconds, the machine asks the user to reset the tray. If this condition occurs three consecutive times, the SC is generated.
• Causes: • Defective tray lift motor or connector disconnection • Defective lift sensor or connector disconnection