• Code: 0100
• Description: Backup memory device error
• Causes: Defective flash memory (U14). Defective control PWB.
• Remedy: Defective flash memory (U14). Replace the control PWB.
  Defective control PWB. Replace the control PWB.

• Code: 0110
• Description: Backup memory data error
• Causes: Defective flash memory (U14). Defective control PWB.
• Remedy: Defective flash memory (U14). Replace the control PWB.
  Defective control PWB. Replace the control PWB.

• Code: 0120
• Description: MAC address data error
• Causes: Defective control PWB.
• Remedy: Defective control PWB. Replace the control PWB.

• Code: 0150
• Description: Control PWB EEPROM error
  Detecting control PWB EEPROM (U2001) communication error.
• Causes: Improper installation control PWB EEPROM (U2001). Defective control PWB.
• Remedy: Improper installation control PWB EEPROM (U2001). Check the installation of the EEPROM (U2001) and remedy if necessary.
  Defective control PWB. Replace the control PWB.

• Code: 0170
• Description: Billing counting error
• Causes: Defective control PWB.
• Remedy: Defective control PWB. Replace the control PWB.

• Code: 0420
• Description: Paper feeder communication error
  Communication error between control PWB and optional paper feeder.
• Causes: Improper installation paper feeder. Defective harness between control PWB (YC344) and paper feeder interface connector, or improper connector insertion. Defective control PWB. Defective harness between PF main PWB (YC5) and paper feeder interface connector, or improper connector insertion. Defective PF main PWB.
• Remedy: Improper installation paper feeder. Follow installation instruction carefully again.
  Defective harness between control PWB (YC344) and paper feeder interface connector, or improper connector insertion. Reinsert the connector. Also check for continuity within the connector harness. If none, remedy or replace the harness.
  Defective control PWB. Replace the control PWB.
  Defective harness between PF main PWB (YC5) and paper feeder interface connector, or improper connector insertion. Reinsert the connector. Also check for continuity within the connector harness. If none, remedy or replace the harness (Refer to the service manual for the paper feeder).
  Defective PF main PWB. Replace the PF main PWB (Refer to the service manual for the paper feeder).

• Code: 0840
• Description: Faults of RTC
  The time is judged to go back based on the comparison of the RTC time and the current time or five years or more have passed.
• Causes: The battery is disconnected from the control PWB. Defective control PWB.
• Remedy: The battery is disconnected from the control PWB. Check visually and remedy if necessary
  Defective control PWB. Replace the control PWB and check for correct operation.

• Code: 0970
• Description: 12 V power down detect
  Power is disconnected during sleeping.
• Causes: Defective power source PWB.
• Remedy: Defective power source PWB. Replace the power source PWB and check for correct operation.