• Code: U2-91
• Description: PCU PWB EEPROM check sum error
• Causes: PCU PWB EEPROM trouble PCU PWB trouble EEPROM socket contact trouble
• Remedy: Check that the EEPROM is attached correctly. Take notes of the counter data and the adjustment values to prevent from deleting the data. (When the printer option is attached, take notes of the adjustment values by SIM22-01.) Replace the PCU PWB. Release this error with SIM16.

• Code: U5-00
• Description: Communication error in SPF
• Causes: Connector, harness connection trouble. DSPF PWB trouble.
• Remedy: Turn OFF/ON the power. Check connection of the connector and the harness. Replace DSPF PWB.

• Code: U5-16
• Description: SPF fan motor trouble
• Causes: Fan motor trouble. Connection trouble of the connector and the harness.
• Remedy: Use Sim2-3 to check the operation. Check the DSPF PWB and connection of the connector and the harness.

• Code: U5-20
• Description: SPF paper feed transport motor trouble
• Causes: SPF paper feed transport motor trouble. Connection trouble of the connector and the harness.
• Remedy: Use Sim2-3 to check the operation. Check the SPF paper feed transport motor and connection of the connector and the harness.

• Code: U5-30
• Description: SPF 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 harness. DSPF PWB trouble.
• Remedy: Replace the STUD/STLD sensor. Check connection of the connector and the harness. Replace DSPF PWB.

• Code: U5-31
• Description: SPF tray 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 DSPF PWB.

• Code: U6-00
• Description: Desk communication trouble
• Causes: Connection trouble or cut-line of the connector and the harness. Desk control PWB trouble Control (PCU) PWB trouble
• Remedy: Check the control PWB. Check connection of the connector and the harness on the communication line. Turn OFF and ON the main unit.

• Code: U6-01
• Description: Desk tray 1 lift motor trouble
• Causes: DLUD1 sensor trouble Desk casette 1 lift up motor trouble Connection trouble of the connector and the harness between the paper feed unit, Desk control PWB, and Lift up unit.
• Remedy: Check the DLUD1, the DLUD1 harness and the connector of the DLUD1. Check the lift up unit. Replace the desk control PWB. Release this error with SIM15.