• Code: C2557
• Description: ATDC Sensor Failure
  - The scanning value of the ATDC Sensor is less than 7 % while the IU Motor is turning.
  - The scanning value of the ATDC Sensor is more than 19 % while the IU Motor is turning.
• Remedy: 1 Check the UN2 connector for proper connection and correct as necessary. 2 Remove the Developing Unit from the IU, and then replace UN2. 3 Run F8. 4 Change PWB-A. 5 Change PU1N.

• Code: C255C
• Description: ATDC Adjustment Failure
  - The adjustment of the ATDC control voltage could not be completed in the set period of time when function F8 is run.
  - The ATDC control voltage was not within the range of 5.39 V to 8.15 V when function F8 is run.
• Remedy: 1 Check the UN2 connector for proper connection and correct as necessary. 2 Remove the Developing Unit from the IU, and then replace UN2. 3 Run F8. 4 Change PWB-A. 5 Change PU1N.

• Code: C2654
• Description: EEPROM Failure
  - An EEPROM where no initial data is written is detected
• Remedy: 1 Disconnect and then connect the power cord. Turn OFF the Main Power Switch, wait for 10 sec. or more, and turn ON the Main Power Switch. 2 Check the EEPROM on the Mechanical Control Board for proper connection, and correct as necessary. 3 Change PWB-A. 4 Change EEPROM.

• Code: C2702
• Description: Abnormal Image Transfer Voltage
  - The image transfer voltage exceeds 100 V for the set period of time while the IU Motor remains stopped.
• Remedy: 1 Check the installation of the Transfer Roller. 2 Change HV1

• Code: C3451
• Description: Fusing Warm-Up Failure (Main)
  - The Fusing Roller Thermistor does not detect the required temperature within 30 sec. after a warmup cycle has begun; therefore, the copier does not complete the warm-up cycle.
  - The temperature of the Fusing Rollers does not reach the required level even after the set period of time has elapsed during a warm-up cycle.
• Remedy: 1 Check that the H1 comes on when the Main Power Switch is set to ON, and correct or replace as necessary. 2 Check that the H2 comes on when the Main Power Switch is set to ON, and correct or replace as necessary. 3 Check the installation of the TH1 and the TH2, and correct or clean as necessary. 4 Check the operation of the TH1. Remove CN80 (4P), and then check that the resistance across CN80-2 and -3 on the Thermistor is infinity. 5 Check the operation of the TH2. Remove CN81 (4P), and then check that the resistance across CN81-2 and -3 on the Thermistor is infinity. 6 Check the continuity of the H1. Correct or replace as necessary. 7 Check the continuity of the H2. Correct or replace as necessary. 8 Change PU1. 9 Change PWB-A.

• Code: C3452
• Description: Fusing Warm-Up Failure (Sub)
  - The Fusing Roller Sub Thermistor does not detect the required temperature within 30 sec. after a warm-up cycle has begun; therefore, the copier does not complete the warm-up cycle.
  - The temperature of the Fusing Rollers does not reach the required level even after the set period of time has elapsed during a warm-up cycle.
• Remedy: 1 Check that the H1 comes on when the Main Power Switch is set to ON, and correct or replace as necessary. 2 Check that the H2 comes on when the Main Power Switch is set to ON, and correct or replace as necessary. 3 Check the installation of the TH1 and the TH2, and correct or clean as necessary. 4 Check the operation of the TH1. Remove CN80 (4P), and then check that the resistance across CN80-2 and -3 on the Thermistor is infinity. 5 Check the operation of the TH2. Remove CN81 (4P), and then check that the resistance across CN81-2 and -3 on the Thermistor is infinity. 6 Check the continuity of the H1. Correct or replace as necessary. 7 Check the continuity of the H2. Correct or replace as necessary. 8 Change PU1. 9 Change PWB-A.

• Code: C3751
• Description: High Fuser Temperature Failure (Main)
  - The Fusing Roller Thermistor and Fusing Roller Sub Thermistor are detected to be at a temperature above 240 °C when the Main Power Switch is set to ON.
• Remedy: 1 Check that the H1 comes on when the Main Power Switch is set to ON, and correct or replace as necessary. 2 Check that the H2 comes on when the Main Power Switch is set to ON, and correct or replace as necessary. 3 Check the installation of the TH1 and the TH2, and correct or clean as necessary. 4 Check the operation of the TH1. Remove CN80 (4P), and then check that the resistance across CN80-2 and -3 on the Thermistor is infinity. 5 Check the operation of the TH2. Remove CN81 (4P), and then check that the resistance across CN81-2 and -3 on the Thermistor is infinity. 6 Check the continuity of the H1. Correct or replace as necessary. 7 Check the continuity of the H2. Correct or replace as necessary. 8 Change PU1. 9 Change PWB-A.

• Code: C3752
• Description: High Fuser Temperature Failure (Sub)
  - The Fusing Roller Thermistor and Fusing Roller Sub Thermistor are detected to be at a temperature above 240 °C when the Main Power Switch is set to ON.
• Remedy: 1 Check that the H1 comes on when the Main Power Switch is set to ON, and correct or replace as necessary. 2 Check that the H2 comes on when the Main Power Switch is set to ON, and correct or replace as necessary. 3 Check the installation of the TH1 and the TH2, and correct or clean as necessary. 4 Check the operation of the TH1. Remove CN80 (4P), and then check that the resistance across CN80-2 and -3 on the Thermistor is infinity. 5 Check the operation of the TH2. Remove CN81 (4P), and then check that the resistance across CN81-2 and -3 on the Thermistor is infinity. 6 Check the continuity of the H1. Correct or replace as necessary. 7 Check the continuity of the H2. Correct or replace as necessary. 8 Change PU1. 9 Change PWB-A.