• Code: C0501
• Description: Warm-up failure 2 (for the model having two Fusing Roller Heater Lamps)
  - The Fusing Roller Sub Thermistor does not detect a predetermined temperature within 30 sec. after a warm-up cycle has been started and thus the warm-up cycle is not completed.
  - The surface temperature of the Fusing Roller does not reach a given level even after the lapse of a given period of time during a warm-up cycle.
• Remedy: 1 Check that the Fusing Roller Heater Lamp (H1) turns ON when the Power Switch is turned ON and correct or replace the lamp as necessary. 2 Check that the Fusing Roller Sub Heater Lamp (H2) turns ON when the Power Switch is turned ON and correct or replace the lamp as necessary. 3 Check the Fusing Roller Thermostat (TS1) for operation. <Check procedure> Check the resistance of TS1. TS1 is open-circuited if its resistance is infinity. 4 Check the Fusing Unit Interlock Switch (S2) for operation. <Check procedure> Check continuity across the following terminals when S2 is ON. • Across S2-1A and S2-1B • Across S2-2A and S2-2B 5 Check the Fusing Roller Thermistor (TH1) and Fusing Roller Sub Thermistor (TH2) for installation and correct or clean as necessary. 6 Check the Fusing Roller Thermistor (TH1) for operation. <Check procedure> Disconnect CN15 (4P) and check the resistance across CN15-2 and 3 on the Thermistor side. TH1 is open-circuited if the resistance is infinity. 7 Check the Fusing Roller Sub Thermistor (TH2) for operation. <Check procedure> Disconnect CN22 (4P) and check the resistance across CN22-2 and 3 on the Thermistor side. TH2 is open-circuited if the resistance is infinity. 8 Check the Fusing Roller Heater Lamp (H1) for continuity and correct or replace as necessary. 9 Check the Fusing Roller Sub Heater Lamp (H2) for continuity and correct or replace as necessary. 10 Change PU1. 11 Change PWB-A.

• Code: C0510
• Description: Fusing failure (abnormally low fusing temperature)
  - The temperature detected by the Fusing Roller Thermistor remains lower than 120°C (105°C for the model having two Fusing Roller Heater Lamps) for a given period of time during the standby state.
  - The temperature detected by the Fusing Roller Thermistor remains lower than 120°C (105°C for the model having two Fusing Roller Heater Lamps) for a given period of time during a print cycle.
• Remedy: 1 Check that the Fusing Roller Heater Lamp (H1) turns ON when the Power Switch is turned ON and correct or replace the lamp as necessary. 2 Check that the Fusing Roller Sub Heater Lamp (H2) turns ON when the Power Switch is turned ON and correct or replace the lamp as necessary. 3 Check the Fusing Roller Thermostat (TS1) for operation. <Check procedure> Check the resistance of TS1. TS1 is open-circuited if its resistance is infinity. 4 Check the Fusing Unit Interlock Switch (S2) for operation. <Check procedure> Check continuity across the following terminals when S2 is ON. • Across S2-1A and S2-1B • Across S2-2A and S2-2B 5 Check the Fusing Roller Thermistor (TH1) and Fusing Roller Sub Thermistor (TH2) for installation and correct or clean as necessary. 6 Check the Fusing Roller Thermistor (TH1) for operation. <Check procedure> Disconnect CN15 (4P) and check the resistance across CN15-2 and 3 on the Thermistor side. TH1 is open-circuited if the resistance is infinity. 7 Check the Fusing Roller Sub Thermistor (TH2) for operation. <Check procedure> Disconnect CN22 (4P) and check the resistance across CN22-2 and 3 on the Thermistor side. TH2 is open-circuited if the resistance is infinity. 8 Check the Fusing Roller Heater Lamp (H1) for continuity and correct or replace as necessary. 9 Check the Fusing Roller Sub Heater Lamp (H2) for continuity and correct or replace as necessary. 10 Change PU1. 11 Change PWB-A.

• Code: C0511
• Description: Fusing failure (abnormally low fusing temperature 2)
  - The temperature detected by the Fusing Roller Sub Thermistor remains lower than 105°C for a given period of time during the standby state.
  - The temperature detected by the Fusing Roller Sub Thermistor remains lower than 105°C for a given period of time during a print cycle.
• Remedy: 1 Check that the Fusing Roller Heater Lamp (H1) turns ON when the Power Switch is turned ON and correct or replace the lamp as necessary. 2 Check that the Fusing Roller Sub Heater Lamp (H2) turns ON when the Power Switch is turned ON and correct or replace the lamp as necessary. 3 Check the Fusing Roller Thermostat (TS1) for operation. <Check procedure> Check the resistance of TS1. TS1 is open-circuited if its resistance is infinity. 4 Check the Fusing Unit Interlock Switch (S2) for operation. <Check procedure> Check continuity across the following terminals when S2 is ON. • Across S2-1A and S2-1B • Across S2-2A and S2-2B 5 Check the Fusing Roller Thermistor (TH1) and Fusing Roller Sub Thermistor (TH2) for installation and correct or clean as necessary. 6 Check the Fusing Roller Thermistor (TH1) for operation. <Check procedure> Disconnect CN15 (4P) and check the resistance across CN15-2 and 3 on the Thermistor side. TH1 is open-circuited if the resistance is infinity. 7 Check the Fusing Roller Sub Thermistor (TH2) for operation. <Check procedure> Disconnect CN22 (4P) and check the resistance across CN22-2 and 3 on the Thermistor side. TH2 is open-circuited if the resistance is infinity. 8 Check the Fusing Roller Heater Lamp (H1) for continuity and correct or replace as necessary. 9 Check the Fusing Roller Sub Heater Lamp (H2) for continuity and correct or replace as necessary. 10 Change PU1. 11 Change PWB-A.

• Code: C0520
• Description: Fusing failure (abnormally high fusing temperature 2)
  - The temperature detected by the Fusing Roller Thermistor remains higher than 240°C for a given period of time.
• Remedy: 1 Check that the Fusing Roller Heater Lamp (H1) turns ON when the Power Switch is turned ON and correct or replace the lamp as necessary. 2 Check that the Fusing Roller Sub Heater Lamp (H2) turns ON when the Power Switch is turned ON and correct or replace the lamp as necessary. 3 Check the Fusing Roller Thermostat (TS1) for operation. <Check procedure> Check the resistance of TS1. TS1 is open-circuited if its resistance is infinity. 4 Check the Fusing Unit Interlock Switch (S2) for operation. <Check procedure> Check continuity across the following terminals when S2 is ON. • Across S2-1A and S2-1B • Across S2-2A and S2-2B 5 Check the Fusing Roller Thermistor (TH1) and Fusing Roller Sub Thermistor (TH2) for installation and correct or clean as necessary. 6 Check the Fusing Roller Thermistor (TH1) for operation. <Check procedure> Disconnect CN15 (4P) and check the resistance across CN15-2 and 3 on the Thermistor side. TH1 is open-circuited if the resistance is infinity. 7 Check the Fusing Roller Sub Thermistor (TH2) for operation. <Check procedure> Disconnect CN22 (4P) and check the resistance across CN22-2 and 3 on the Thermistor side. TH2 is open-circuited if the resistance is infinity. 8 Check the Fusing Roller Heater Lamp (H1) for continuity and correct or replace as necessary. 9 Check the Fusing Roller Sub Heater Lamp (H2) for continuity and correct or replace as necessary. 10 Change PU1. 11 Change PWB-A.

• Code: C0521
• Description: Fusing failure (abnormally high fusing temperature 2)
  - The temperature detected by the Fusing Roller Sub Thermistor remains higher than 240°C for a given period of time.
• Remedy: 1 Check that the Fusing Roller Heater Lamp (H1) turns ON when the Power Switch is turned ON and correct or replace the lamp as necessary. 2 Check that the Fusing Roller Sub Heater Lamp (H2) turns ON when the Power Switch is turned ON and correct or replace the lamp as necessary. 3 Check the Fusing Roller Thermostat (TS1) for operation. <Check procedure> Check the resistance of TS1. TS1 is open-circuited if its resistance is infinity. 4 Check the Fusing Unit Interlock Switch (S2) for operation. <Check procedure> Check continuity across the following terminals when S2 is ON. • Across S2-1A and S2-1B • Across S2-2A and S2-2B 5 Check the Fusing Roller Thermistor (TH1) and Fusing Roller Sub Thermistor (TH2) for installation and correct or clean as necessary. 6 Check the Fusing Roller Thermistor (TH1) for operation. <Check procedure> Disconnect CN15 (4P) and check the resistance across CN15-2 and 3 on the Thermistor side. TH1 is open-circuited if the resistance is infinity. 7 Check the Fusing Roller Sub Thermistor (TH2) for operation. <Check procedure> Disconnect CN22 (4P) and check the resistance across CN22-2 and 3 on the Thermistor side. TH2 is open-circuited if the resistance is infinity. 8 Check the Fusing Roller Heater Lamp (H1) for continuity and correct or replace as necessary. 9 Check the Fusing Roller Sub Heater Lamp (H2) for continuity and correct or replace as necessary. 10 Change PU1. 11 Change PWB-A.

• Code: C0650
• Description: Faulty Scanner Home Position Sensor
  - The Scanner Home Position Sensor (PC10) does not go from HIGH to LOW when the Scanner Motor (M5) is energized for a given number of steps after the sequence to bring the Scanner back to its home position has been started at the end of a scan motion and during re-shading.
  - The Scanner Home Position Sensor (PC10) does not go from LOW to HIGH when the Scanner Motor (M5) is energized for a given number of steps after a scan motion has been started at the end of a Scanner Home Position Sensor home check scan motion and during re-shading.
• Remedy: 1 Check M5 connectors for proper connection and correct as necessary. 2 Check M5 for correct drive coupling and correct as necessary. 3 M5 operation check 4 Scanner operation check 5 PC10 sensor check 6 Change PWB-C/C.

• Code: C0B60
• Description: Bin Switching Motor malfunction (Only when the optional JS is mounted)
  - Refer to the option service manual (JS-503) for details.
• Remedy:

• Code: C0B80
• Description: Shift Motor malfunction (Only when the optional SF is mounted)
  - Refer to the option service manual (SF-501) for details.
• Remedy: