• Code: L8-01
• Description: Zero cross pulse (FW) trouble
  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: EEPROM serial communication error
  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: Mirror base home position error
  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: Operation control PWB communication trouble
  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.

• Code: U9-80
• Description: Operation control PWB communication trouble (Protocol)
  Communication trouble between MCU and the operation control PWB (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.

• Code: U9-81
• Description: Operation control PWB communication trouble (Parity)
  Communication trouble between MCU and the operation control PWB (Parity 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.