• Code: U2-11
• Description: Counter check sum error (EEPROM)
  Check sum error of the counter area in the EEPROM.
• Causes: EEPROM abnormality.
• Remedy: Check that the EEPROM is properly set. Use SIM 16 to cancel the trouble. Replace the MCU PWB.

• Code: U2-40
• Description: CRUM chip communication error
  An error occurs during communication between the MCU and the CRUM chip.
• Causes: CRUM chip abnormality.
  Developing unit disconnection.
  MCU PWB abnormality.
• Remedy: Replace the chip. Check installation of the developing unit. Use SIM 16 to cancel the trouble. Replace the MCU PWB.

• Code: U9-00
• Description: Panel board communication trouble
  Communication trouble with the panel board.
• Causes: No command can be sent from the MCU to the panel.
• Remedy: MCU PWB - Panel PWB harness trouble. Replace the panel or the MCU PWB. Machine reset (Power OFF/ON).

• Code: U9-80
• Description: Panel board communication trouble (Protocol)
  An error occurs in communication between MCU -Panel PWB.
• Causes: MCU PWB - Panel PWB harness trouble/ Garbled data.
• Remedy: MCU PWB - Panel PWB harness trouble. Replace the panel or the MCU PWB. Machine reset (Power OFF/ON).

• Code: U9-81
• Description: Panel board communication trouble (Parity)
  A parity error occurs in communication between the MCU and the Panel PWB.
• Causes: MCU PWB - Panel PWB harness trouble/ Garbled data.
• Remedy: MCU PWB - Panel PWB harness trouble. Replace the panel or the MCU PWB. Machine reset (Power OFF/ON).

• Code: U9-82
• Description: Panel board communication trouble (Overrun)
  An overrun error occurs in communication between the MCU and the panel board.
• Causes: MCU PWB - Panel PWB harness trouble/ Garbled data.
• Remedy: MCU PWB - Panel PWB harness trouble. Replace the panel or the MCU PWB. Machine reset (Power OFF/ON).

• Code: U9-84
• Description: Panel board communication trouble (Framing)
  A framing error occurs in communication between the MCU and the Panel PWB.
• Causes: MCU PWB - Panel PWB harness trouble/ Garbled data.
• Remedy: MCU PWB - Panel PWB harness trouble. Replace the panel or the MCU PWB. Machine reset (Power OFF/ON).

• Code: U9-88
• Description: Panel board communication trouble (Time out)
  A time-out error occurs in communication between the MCU and the Panel PWB.
• Causes: A command is completely sent from the MCU to the panel.
• Remedy: MCU PWB - Panel PWB harness trouble. Replace the panel or the MCU PWB. Machine reset (Power OFF/ON).