• Code: U5-30
• Description: SPF lift-up trouble
  Lift-up trouble is detected 5 times continuously. (MX-3501N/4501N)
• Causes: STUD/STLD trouble
• Remedy: Check STUD/STLD and its harness and connector. Check the lift-up unit.

• Code: U5-31
• Description: SPF tray lift-down trouble
  Lift-down trouble (STLD does not turn OFF within the specified time.) (MX-3501N/4501N)
• Causes: STUD/STLD trouble
• Remedy: Check STUD/STLD and its harness and connector. Check the lift-up unit.

• Code: U5-40
• Description: SPF install trouble
  Detected the installed (individual installed signal ) of RSPF/DSPF both.
• Causes: Circuit trouble of the installed detection signal
• Remedy: Check installed detection circuit and harness, connector.

• Code: U6-00
• Description: Desk communication trouble
  Desk communication error, communication line test error after turning on the power or canceling the exclusive simulation
• Causes: Connector and harness connection trouble or disconnection, desk control PWB trouble, control PWB (PCU) trouble, malfunction due to electrical noises
• Remedy: Cancel the trouble by turning OFF/ON. Check the connector and the harness of the communication line.

• Code: U6-01
• Description: Tray 1 lift-up trouble
  DLUD1 does not turn ON within the specified time.
• Causes: DLUD1 sensor trouble, tray 1 lift-up motor trouble, desk PWB, lift-up unit, paper feed unit harness connection trouble
• Remedy: Check DLUD1 and its harness and connector. Check the lift-up unit.

• Code: U6-02
• Description: Tray 2 lift-up trouble
  DLUD2 does not turn ON within the specified time
• Causes: DLUD2 sensor trouble, tray 2 lift-up motor trouble, desk PWB, lift-up unit, paper feed unit harness connection trouble
• Remedy: Check DLUD2 and its harness and connector. Check the lift-up unit.

• Code: U6-09
• Description: LCC lift motor trouble
  • The encoder input value is not changed in 0.13sec (1st time)/0.5sec (2nd time and later) after rotation of the motor. • The motor is rotated for 18sec or more. • The encoder is changed after passing a certain time from stopping the motor. (2sec, 10 count or more)
• Causes: Sensor trouble, LCC control PWB trouble, gear breakage, lift motor trouble
• Remedy: Use SIM4-2 and 4-3 to check the operation of the sensor and the lift motor. Use SIM15 to cancel the trouble.

• Code: U6-10
• Description: Desk transport motor trouble
  Desk transport motor operation trouble
• Causes: Motor lock, motor RPM abnormality, overcurent to the motor, console finisher control PWB trouble
• Remedy: Use SIM 4-3 to check the operation of the desk transport motor.