• Code: C7602
• Description: ID sensor 2 error
  An abnormal value is detected in the input data to ID sensor 2.
• Causes: Poor contact in the connector terminals. Defective engine PWB.
• Remedy: Poor contact in the connector terminals. Check the connection of connector YC8 on the engine PWB and the continuity across the connector terminals. Repair or replace if necessary.
  Defective engine PWB. Replace the engine PWB and check for correct operation.

• Code: C7800
• Description: Broken external thermistor wire
  An abnormal value is detected in the input data to the outer temperature sensor.
• Causes: Poor contact in the connector terminals. Defective PWB.
• Remedy: Poor contact in the connector terminals. Check the connection of connector YC1 on the main front PWB and the continuity across the connector terminals. Repair or replace if necessary.
  Defective PWB. Replace the main front PWB or engine PWB and check for correct operation.

• Code: C7901
• Description: Drum K 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: Poor contact in the connector terminals. Defective drum PWB K.
• Remedy: Poor contact in the connector terminals. Check the connection of connector YC3 on the main front PWB and the continuity across the connector terminals. Repair or replace if necessary.
  Defective drum PWB K. Replace the drum unit K.

• Code: C7902
• Description: Drum C 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: Poor contact in the connector terminals. Defective drum PWB C.
• Remedy: Poor contact in the connector terminals. Check the connection of connector YC5 on the sub front PWB and the continuity across the connector terminals. Repair or replace if necessary.
  Defective drum PWB C. Replace the drum unit C.

• Code: C7903
• Description: Drum M 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: Poor contact in the connector terminals. Defective drum PWB M.
• Remedy: Poor contact in the connector terminals. Check the connection of connector YC7 on the sub front PWB and the continuity across the connector terminals. Repair or replace if necessary.
  Defective drum PWB M. Replace the drum unit M.

• Code: C7904
• Description: Drum Y 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: Poor contact in the connector terminals. Defective drum PWB Y.
• Remedy: Poor contact in the connector terminals. Check the connection of connector YC3 on the sub front PWB and the continuity across the connector terminals. Repair or replace if necessary.
  Defective drum PWB Y. Replace the drum unit Y.

• Code: C7911
• Description: Developing unit K 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: Poor contact in the connector terminals. Defective developing PWB K.
• Remedy: Poor contact in the connector terminals. Check the connection of connector YC4 on the main front PWB and the continuity across the connector terminals. Repair or replace if necessary.
  Defective developing PWB K. Replace the developing unit K.

• Code: C7912
• Description: Developing unit C 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: Poor contact in the connector terminals. Defective developing PWB C.
• Remedy: Poor contact in the connector terminals. Check the connection of connector YC6 on the sub front PWB and the continuity across the connector terminals. Repair or replace if necessary.
  Defective developing PWB C. Replace the developing unit C.