• Code: 7800
• Description: Broken external thermistor wire
  The average of thermistor output value of 1016 or more continuously for 160 ms. The average of thermistor output value of 930 or more continuously for 5 s.Г <tХ
• Causes: Defective connector cable or poor contact in the connector. Defective temperature sensor.
• Remedy: Defective connector cable or poor contact in the connector. Reinsert the connector. Also check for continuity within the connector cable. If none, replace the cable. Operation PWB and engine PWB (YC17)
  Defective temperature sensor. Replace the operation PWB.

• Code: 7810
• Description: Short-circuited external thermistor wire
  The average of thermistor output value of 31 or less continuously for 5 s.
• Causes: Defective connector cable or poor contact in the connector. Defective temperature sensor.
• Remedy: Defective connector cable or poor contact in the connector. Reinsert the connector. Also check for continuity within the connector cable. If none, replace the cable. Operation PWB and engine PWB (YC17)
  Defective temperature sensor. Replace the operation PWB.

• Code: 7900
• Description: Drum unit EEPROM error
  No response is issued from the device in reading/writing for 5 ms or more and this problem is repeated five times successively. Mismatch of reading data from two locations occurs eight times successively. Mismatch between writing data and reading data occurs eight times successively.
• Causes: Defective connector cable or poor contact in the connector. Defective drum unit.
• Remedy: Defective connector cable or poor contact in the connector. Reinsert the connector. Also check for continuity within the connector cable. If none, replace the cable. Drum unit and drum connect PWB (YC1) Drum connect PWB and relay-L PWB (YC3) Relay-L PWB and engine PWB (YC15)
  Defective drum unit. Replace the drum unit.

• Code: F000
• Description: Main PWB - operation PWB communication error
• Causes: Defective connector cable or poor contact in the connector. Defective main PWB. Defective operation PWB
• Remedy: Defective connector cable or poor contact in the connector. Reinsert the connector. Also check for continuity within the connector cable. If none, replace the cable. Operation PWB and engine PWB (YC17)
  Defective main PWB. Turn the main power switch off/on to restart the machine. If the error is not resolved, replace main PWB.
  Defective operation PWB. Replace the operation PWB and check for correct operation.

• Code: F010
• Description: Main PWB checksum error
• Causes: Defective main PWB.
• Remedy: Defective main PWB. Turn the main power switch off/on to restart the machine. If the error is not resolved, replace main PWB.

• Code: F020
• Description: Main PWB RAM checksum error
• Causes: Defective main memory (RAM) in main PWB Defective expended memory (DIMM)
• Remedy: Defective main memory (RAM) in main PWB Turn the main power switch off/on to restart the machine. If the error is not resolved, replace main PWB.
  Defective expended memory (DIMM) Replace the expansion memory (DIMM). Also in the case of the capacity besides specification, it displays.

• Code: F040
• Description: Main PWB - print engine communication error
• Causes: Defective main PWB. Defective engine PWB.
• Remedy: Defective main PWB. Turn the main power switch off/on to restart the machine. If the error is not resolved, replace main PWB.
  Defective engine PWB. Replace the engine PWB and check for correct operation.

• Code: F050
• Description: Print engine ROM checksum error
• Causes: Defective engine PWB
• Remedy: Turn the main power switch off/on to restart the machine. If the error is not resolved, replace engine PWB.