• Code: C0420
• Description: Exposure Lamp turning ON at abnormal timing
  During a light intensity adjustment sequence, the adjusted value for the intensity of light remains at the lower limit and the CCD output level is at the saturation level even after the lapse of 2 sec. after the Exposure Lamp has turned ON.
• Remedy: 1 Exposure Lamp has discolored. YES Change Exposure Lamp. 2 NG is displayed when “Scanning Check” of Function (IR) is run. YES Check the optical path. Change Image Processing Board or CCD Board. 3 Power Supply Board operation: the voltage across PJ9C-4 on Power Supply Board and GND is DC24V after the malfunction has been reset. YES Check and change, as necessary, flat cable. Change Inverter Board or Image Processing Board. NO Change Power Supply Board.

• Code: C0500
• Description: Warming-up failure
  The surface temperature of the Upper Fusing Roller does not reach a specified level even after the lapse of a predetermined period of time during warming-up as detailed below: • From room temperature to 90°C: Within 180 sec. • From 90°C to 140°C: Within 140 sec. • From 140°C to 170°C: Within 135 sec. The copier fails to complete its warm-up cycle within 135 sec. after the temperature has reached 170°C.
• Remedy: 1 Upper Fusing Roller Heater Lamp turns ON when the Power Switch is turned ON. YES Correct thermistor for mounting position and/or clean. 2 Lower Fusing Roller Heater Lamp turns ON when the malfunction is reset with the surface temperature of Lower Fusing Roller Heater Lamp is 140°C or less as indicated on Level History under the Tech. Rep. mode. NO Check step 7 and onward. 3 Upper and Lower Fusing Roller Thermistors are installed properly. NO Reinstall. 4 Upper and Lower Fusing Roller Thermistors are dirty. NO Clean. 5 Upper Fusing Roller Thermistor operation: the resistance across CN217-2 and 3 on the Fusing Unit end is infinity with CN217 (4P) disconnected. YES Change Upper Fusing Roller Thermistor. 6 Lower Fusing Roller Thermistor operation: the resistance across CN218-2 and 3 on the Fusing Unit end is infinity with CN218 (4P) disconnected. YES Change Lower Fusing Roller Thermistor. 7 Upper Fusing Roller Thermostat and Upper Fusing Roller Heater Lamp continuity: there is continuity across CN11-1 and 8 with CN11 (16P) disconnected. NO Change thermostat and heater lamp. 8 Lower Fusing Roller Heater Lamp continuity: there is continuity across CN11-9 and 16 with CN11 (16P) disconnected. NO Change heater lamp.

• Code: C0510
• Description: Abnormally low fusing temperature
  • The surface temperature of the Upper Using Roller remains less than 120°C for a continuous period of 2 sec. or more after the copier has completed warming up. • The surface temperature of the Lower Using Roller remains 80°C or less for a continuous period of 2 sec. or more after the copier has completed warming up.
• Remedy: 1 Upper Fusing Roller Heater Lamp turns ON when the Power Switch is turned ON. YES Correct thermistor for mounting position and/or clean. 2 Lower Fusing Roller Heater Lamp turns ON when the malfunction is reset with the surface temperature of Lower Fusing Roller Heater Lamp is 140°C or less as indicated on Level History under the Tech. Rep. mode. NO Check step 7 and onward. 3 Upper and Lower Fusing Roller Thermistors are installed properly. NO Reinstall. 4 Upper and Lower Fusing Roller Thermistors are dirty. NO Clean. 5 Upper Fusing Roller Thermistor operation: the resistance across CN217-2 and 3 on the Fusing Unit end is infinity with CN217 (4P) disconnected. YES Change Upper Fusing Roller Thermistor. 6 Lower Fusing Roller Thermistor operation: the resistance across CN218-2 and 3 on the Fusing Unit end is infinity with CN218 (4P) disconnected. YES Change Lower Fusing Roller Thermistor. 7 Upper Fusing Roller Thermostat and Upper Fusing Roller Heater Lamp continuity: there is continuity across CN11-1 and 8 with CN11 (16P) disconnected. NO Change thermostat and heater lamp. 8 Lower Fusing Roller Heater Lamp continuity: there is continuity across CN11-9 and 16 with CN11 (16P) disconnected. NO Change heater lamp.

• Code: C0520
• Description: Abnormally high fusing temperature
  • The surface temperature of the Upper Using Roller remains 215°C or more for a continuous period of 2 sec. or more after the copier has completed warming up. • The surface temperature of the Lower Using Roller remains 200°C or more for a continuous period of 2 sec. or more after the copier has completed warming up.
• Remedy: 1 Upper Fusing Roller Heater Lamp is ON even after the copier has completed warming up. Or Lower Fusing Roller Heater Lamp is ON when the surface temperature of Lower Fusing Roller Heater Lamp is 140°C or more as indicated on Level History under the Tech. Rep. mode. YES Change DC Power Supply Main. 2 Upper and Lower Fusing Roller Thermistors are installed properly. NO Reinstall. 3 Upper and Lower Fusing Roller Thermistors are dirty. NO Clean. 4 Upper Fusing Roller Thermistor operation: the resistance across CN217-2 and 3 on the Fusing Unit end is infinity with CN217 (4P) disconnected. YES Change Upper Fusing Roller Thermistor. 5 Lower Fusing Roller Thermistor operation: the resistance across CN218-2 and 3 on the Fusing Unit end is infinity with CN218 (4P) disconnected. YES Change Lower Fusing Roller Thermistor.

• Code: C0540
• Description: Abnormally low Lower Fusing Roller temperature
  The surface temperature of the Lower Fusing Roller remains 50°C or less for a continuous period of 2 sec. or more after the copier has completed warming up.
• Remedy:

• Code: C0602
• Description: Cable unwound
  A Scanner drive command is issued when the Scanner is at its home position and the Scanner Reference Position Sensor remains blocked even after the lapse of a given period of time (after the Scanner has been driven to move a given distance thereafter).
• Remedy: 1 Scanner moves as moved manually. NO Correct drive coupling. Rewind cables. 2 Connector on SCP Board is connected properly: PJ3IC on PWB-IC. NO Connect. 3 Scanner Motor turns when the Start key is pressed. NO Correct drive coupling. Change motor or SCP Board. 4 Connector on Image Processing Board is connected properly: PJ306B on PWB-B. NO Connect. 5 I/O check for Scanner Reference Position Sensor YES Change Image Processing Board. NO Correct actuator. Change sensor.

• Code: C0650
• Description: SHOME signal error
  A Scanner drive command is issued when the Scanner is at a position other than its home and the Scanner Reference Position Sensor is not blocked even after the lapse of a given period of time (after the Scanner has been driven to move a given distance thereafter).
• Remedy: 1 Scanner moves as moved manually. NO Correct drive coupling. Rewind cables. 2 Connector on Image Processing Board is connected properly: PJ306B on PWB-B. NO Connect. 3 Light Blocking Plate is installed properly. NO Correct. 4 I/O check for Scanner Reference Position Sensor YES Change Image Processing Board. NO Correct actuator. Change sensor.

• Code: C0900
• Description: 3rd Drawer Paper Lift-Up Sensor malfunction
• Remedy: 1 Lift-Up Motor turns when the 3rd Drawer is slid out and then back in. NO Correct drive coupling. 2 3rd Drawer Paper Lift-Up Motor rotation: the voltage across PJ5A-3B on Control Board and GND is DC0V (motor deenergized) and DC24V (motor energized) after the 3rd Drawer has been slid back in. YES Change motor. NO Change Control Board. 3 I/O check for 3rd Drawer Lift-Up Motor Pulse Sensor operation: the voltage across PJ5A-9B on Control Board and GND changes in the range between DC0V and DC5V while 3rd Drawer Paper Lift-Up Motor is turning. YES Change Control Board. NO Correct drive coupling. Change sensor. 4 I/O check for 3rd Drawer Paper Lift-Up Sensor: the voltage across PJ8A-2 on Control Board and GND is DC0V (sensor unblocked) and DC5V (sensor blocked). YES Change Control Board. NO Change sensor.