• Code: U2-30
• Description: Serial number data discrepancy (MFP - PCU)
  The serial number stored in the PCU differs from that stored in the MFP.
• Causes: EEPROM is not changed when the PCU/MFPcnt PWB is replaced.
• Remedy: 1) Check that EEPROM is properly set. 2) Check that EEPROM on the previous PWB is inserted to the newly installed PWB.

• Code: U2-50
• Description: HDD section individual data check sum error
  MFPcnt HDD individual data check sum error (One-touch, group, program, etc.)
• Causes: Write/read error to/from HDD Control circuit hang-up due to electrical noises MFPcnt PWB HDD access circuit trouble
• Remedy: Case 1 Cause Write/read error to/from HDD Check and remedy 1) Turn OFF/ON the power to initialize the data related to the check sum error contents. 2) Since the registered contents have been deleted, register them again. 3) If the trouble is not canceled, replace the HDD. Case 2 Cause Control circuit hang-up due to electrical noises Check and remedy Use SIM16 to cancel U2 trouble. Case 3 Cause MFPcnt PWB HDD access circuit trouble Check and remedy Replace the MFPcnt PWB.

• Code: U2-80
• Description: EEPROM read/write error (SCU detection)
  1) EEPROM version error 2) Write error to EEPROM
• Causes: EEPROM trouble, installation of EEPROM which is not initialized SCU PWB EEPROM access circuit trouble
• Remedy: Case 1 Cause EEPROM trouble, installation of EEPROM which is not initialized Check and remedy Check that EEPROM is properly set. Case 2 Cause SCU PWB EEPROM access circuit trouble Check and remedy To avoid deletion of the counter data/adjustment data, use the simulation to save the counter/ adjustment values. (If there is a printer option, execute SIM22-1 to save the counter data and the adjustment values.) Replace the SCU PWB. Use SIM16 to cancel the trouble.

• Code: U2-81
• Description: Adjustment value check sum error (SCU detection)
  EEPROM (SCU) check sum error
• Causes: Control circuit hang-up due to electrical noises EEPROM trouble SCU PWB EEPROM access circuit trouble
• Remedy: Case 1 Cause Control circuit hang-up due to electrical noises Check and remedy Use SIM16 to cancel U2 trouble. Case 2 Cause EEPROM trouble Check and remedy To avoid deletion of the counter data/adjustment data, use the simulation to save the counter/ adjustment values. (If there is a printer option, execute SIM22-1 to save the counter data and the adjustment values.) Replace the SCU PWB. Use SIM16 to cancel the trouble. Case 3 Cause SCU PWB EEPROM access circuit trouble Check and remedy Check that EEPROM is properly set.

• Code: U2-90
• Description: EEPROM read/write error (PCU detection)
  EEPROM version error, write error to EEPROM
• Causes: EEPROM trouble, installation of EEPROM which is not initialized PCU PWB EEPROM access circuit trouble
• Remedy: Case 1 Cause EEPROM trouble, installation of EEPROM which is not initialized Check and remedy Check that EEPROM is properly set. Case 2 Cause PCU PWB EEPROM access circuit trouble Check and remedy To avoid deletion of the counter data/adjustment data, use the simulation to save the counter/ adjustment values. (If there is a printer option, execute SIM22-1 to save the counter data and the adjustment values.) Replace the PCU PWB. Use SIM16 to cancel the trouble.

• Code: U2-91
• Description: EEPROM (PCU) check sum error
  Check sum error of adjustment value (PCU)
• Causes: Control circuit hang-up due to electrical noises EEPROM trouble. PCU PWB EEPROM access circuit trouble
• Remedy: Case 1 Cause Control circuit hang-up due to electrical noises Check and remedy Use SIM16 to cancel the trouble. Case 2 Cause EEPROM trouble. Check and remedy Check that EEPROM is properly set. Case 3 Cause PCU PWB EEPROM access circuit trouble Check and remedy To avoid deletion of the counter data/adjustment data, use the simulation to save the counter/ adjustment values. (If there is a printer option, execute SIM22-1 to save the counter data and the adjustment values.) Replace the PCU PWB.

• Code: U5-00
• Description: SPF communication trouble
  Communication error between the SCU and the DSPF, communication line test error after turning on the power or canceling the exclusive simulation (MX-3501N/3501FN/4501N/4501FN)
• Causes: Malfunction due to electrical noises Connector and harness connection trouble or disconnection Control (SCU) PWB trouble. DSPF PWB trouble
• Remedy: Case 1 Cause Malfunction due to electrical noises Check and remedy Cancel the trouble by turning OFF/ON. Case 2 Cause Connector and harness connection trouble or disconnection Check and remedy Check the connector and the harness of the communication line. Case 3 Cause Control (SCU) PWB trouble. DSPF PWB trouble Check and remedy Replace the control (SCU) PWB. Replace the DSPF PWB.

• Code: U5-16
• Description: SPF fan motor trouble
  The motor lock signal is detected during rotation of the fan.
• Causes: Fan motor trouble,harness of the fan motor related, circuit trouble
• Remedy: Use SIM2-3 to check the operation. Check harness, connector and fan motor related circuit..