• Code: U2-81
• Description: SCU EEPROM check sum error
• Causes: SCU PWB EEPROM trouble. Installation of non-initialized EEPROM. SCU PWB trouble. EEPROM socket contact trouble.
• Remedy: Replace the SCU PWB EEPROM. Replace the SCU PWB. Check contact of the EEPROM socket. Use SIM16 to cancel the trouble. (The check sum error detection data are calculated again to reset the proper check sum data.)

• Code: U2-90
• Description: PCU EEPROM read write error
• Causes: PCU PWB EEPROM trouble PCU PWB trouble EEPROM socket contact trouble
• Remedy: Replace the PCU PWB EEPROM. Check the SIM adjustment values of the engine, and adjust again if they are improper. Replace the PCU PWB. Check contact of the EEPROM socket. Use SIM16 to cancel the trouble.

• Code: U2-91
• Description: PCU EEPROM check sum error
• Causes: PCU PWB EEPROM trouble PCU PWB trouble EEPROM socket contact trouble
• Remedy: Replace the PCU PWB EEPROM. Replace the PCU PWB. Check contact of the EEPROM socket. Use SIM16 to cancel the trouble. (The check sum error detection data are calculated again to reset the proper check sum data.)

• Code: U5-00
• Description: Document feed unit communication error
• Causes: Connector, harness connection trouble. SCU PWB trouble. DSPF PWB trouble.
• Remedy: Turn OFF/ON the power. Check connection of the connector and the harness. Replace the SCU PWB. Replace the DSPF PWB.

• Code: U5-16
• Description: Document feed unit fan motor trouble
• Causes: When the fan is operated, the fan operation signal is not detected within the specified time. Fan motor trouble. Connector, harness connection trouble. DSPF PWB trouble.
• Remedy: Use SIM2-3 to check that the fan is rotating. Replace the fan motor. Check connection of the connector and the harness. Replace the DSPF PWB.

• Code: U5-30
• Description: Document feed unit tray lift up trouble
• Causes: STUD does not turn ON 5 times continuously within the specified time. STUD/STLD sensor trouble. Connection trouble of the connector and the harness. DSPF PWB trouble.
• Remedy: Replace the STUD/STLD sensor. Check connection of the connector and the harness. Replace the DSPF PWB.

• Code: U5-31
• Description: Document feed unit lift down trouble
• Causes: STLD does not turn OFF within the specified time. STUD/STLD sensor trouble. Connection trouble of the connector and the harness. DSPF PWB trouble.
• Remedy: Replace the STUD/STLD sensor. Check connection of the connector and the harness. Replace the DSPF PWB.

• Code: U6-09
• Description: LCC lift motor trouble
• Causes: LCC lift motor rotation sensor trouble LCC control PWB trouble LCC lift mechanism trouble LCC lift motor trouble
• Remedy: Use SIM4-2 and 4-3 to check the operation of the LCC sensor and the lift motor. Check the LCC lift motor rotation sensor, and replace if necessary. Check the LCC control PWB, and replace if necessary. Check the LCC lift mechanism, and repair if necessary. Check the LCC lift motor, and replace if necessary. Use SIM15 to cancel the trouble.