• Code: L4 01
• Description: Main motor lock. The main motor encoder pulse is not detected for 400msec.
• Causes: Main motor defect Harness disconnection between the MCU PWB and the main motor. Control circuit failure
• Remedy: Check the main motor operation with SIM 25-1. Check the harness and the connector between the MCU PWB and the main motor.

• Code: L6 10
• Description: Polygon motor lock. The lock signal (the specified rotation speed signal) is not supplied within the specified time (about 6 sec)after starting the polygon motor rotation.
• Causes: LSU connector disconnection or harness disconnection in the LSU.
• Remedy: Check the operation of the polygon motor with SIM 25-10. Check the harness and the connector connection. LSU replacement

• Code: L8 01
• Description: Zero cross pulse width is shifted by 55Hz ± 10% or more.
• Causes: MCU PWB defect Power unit breakdown
• Remedy: Check the harness and the connector. MCU PWB replacement Power unit replacement

• Code: U2 04
• Description: Error in communication with EEPROM
• Causes: EEPROM failure Installation of uninitialized EEPROM MCU PWB EERPOM access circuit failure
• Remedy: Check that the EEPROM is properly set. To prevent against loss of counter/adjustment values, record the values with simulation. U2 trouble cancel with SIM 16 MCU PWB replacement

• Code: U2 11
• Description: Counter check sum error. Counter check sum value stored in the EEPROM is abnormal.
• Causes: EEPROM failure Control circuit hung up by noises MCU PWB EEPROM access circuit defect
• Remedy: Check that the EEPROM is properly set. To prevent against loss of counter/adjustment values, record the values with simulation. U2 trouble cancel with SIM 16 MCU PWB replacement

• Code: U2 12
• Description: Adjustment value check sum error (EEPROM). Adjustment value data area check sum error
• Causes: EEPROM failure Control circuit hung up by noises MCU PWB EEPROM access circuit failure
• Remedy: Check that the EEPROM is properly set. To prevent against loss of counter/adjustment values, record the values with simulation. U2 trouble cancel with SIM 16 MCU PWB replacement

• Code: U3 29
• Description: Home position is not detected when starting mirror base shift.
• Causes: Mirror unit defect Mirror home position sensor defect MCU PWB decfect Scanner wire disconnection
• Remedy: Check the scanning operation with SIM 1-1.

• Code: U9 00
• Description: Communication trouble between MCU and OPE (OPE detection). Communication setup error, framing, parity, protocol error
• Causes: Operation control PWB connector disconnection Operation control PWB MCU PWB harness failure
• Remedy: Check the connectors and harness of the operation control PWB and the MCU PWB. Check grounding of the machine. Check the ROM of the operation control PWB.