• Code: C0510
• Description: Abnormally low fusing temperature
  • The fusing temperature remains 105 °C or less for a continuous 0.1-sec. period or more during the standby state or printing. • The fusing temperature remains a level lower than the following temperature for a continuous 2-min. period or more during the low-temperature standby state. 35-cpm copier: 105 °C 25-cpm copier: 80 °C 20-cpm copier (U.S.A. and Canada only): 80 °C
• Remedy: 1 Fusing Roller Heater Lamp turns ON when the Side Cover is opened and closed. NO Check step 3 and onward. 2 The resistance of Fusing Roller Thermistor (across CN25-2 and 3 on the Fusing Unit end) is infinity. YES Change Fusing Roller Thermistor. NO Change Master Board. 3 There is continuity across CN3-1 and 2 on the Fusing Unit end. YES Check step 7. 4 Fusing Roller Heater Lamp is conducting. NO Change Fusing Roller Heater Lamp. 5 Fusing Roller Thermostat is conducting. NO Change Fusing Roller Thermostat. 6 Fusing Roller Heater Lamp Fuse is conducting. NO Change Fusing Roller Heater Lamp Fuse. 7 There is continuity across 1A and 1B, and across 2A and 2B, when Side Cover Interlock Switch 2 is actuated. YES Change Power Supply Unit. Change Master Board. NO Change Side Cover Interlock Switch 2.

• Code: C0520
• Description: Abnormally high fusing temperature
  The fusing temperature remains 230 °C or more for a continuous 0.1-sec. period or more.
• Remedy: 1 Fusing Roller Thermistor is dirty. YES Clean. 2 The circuit across CN25-2 and -3 on the Fusing Unit end is shorted. YES Change Fusing Roller Thermistor. NO Change Master Board.

• Code: C0650
• Description: Faulty Scanner Home Position Sensor 1
  <The Power Switch is turned ON, Original Cover lowered, or Start key pressed when the Scanner is at its home position> • The Scanner Home Position Sensor 1 is not unblocked (H) even when the Scanner moves 10 mm to the left. • The Scanner Home Position Sensor 1 is not blocked (L) even when the Scanner moves 4 mm to the right after the Scanner Home Position Sensor 1 has been unblocked (H). <The Power Switch is turned ON, Original Cover lowered, or Start key pressed when the Scanner is at any position other than home> • The Scanner Home Position Sensor 1 is not blocked (L) even when the Scanner moves 469.5 mm to the right.
• Remedy: 1 Scanner Motor operation check: Select functions in the following order: Tech. Rep. Mode - Movement Check - Scanner; set +1000 in Relative Position?h and touch Set?h; the Scanner moves at this time. YES Check step 3 and onward. 2 The Scanner can be moved manually. YES Change Scanner Motor. Change BCR Board. Change MFB2 Board. Change Master Board. NO Correct drive coupling. 3 C0651 is displayed. YES Check step 7 and onward. 4 Scanner Home Position Sensor 1 operation check through I/O check YES Check to see if Scanner Home Position Sensor 1 is blocked as the Scanner is moved. If it is checked okay, change Master Board. 5 Scanner Home Position Sensor 1 operation check: the voltage across CN11BCR-1 on BCR Board and GND is DC0 V when the sensor is blocked and DC5 V when the sensor is unblocked. NO Change Scanner Home Position Sensor 1. 6 Scanner Home Position Sensor 1 operation check: the voltage across CN1BCR-26 on BCR Board and GND is DC0 V when the sensor is blocked and DC5 V when the sensor is unblocked. YES Change BCR Board. NO Change MFB2 Board. Change Master Board. 7 Scanner Home Position Sensor 2 operation check through I/O check YES Check to see if Scanner Home Position Sensor 2 is blocked as the Scanner is moved. If it is checked okay, change Master Board. 8 Scanner Home Position Sensor 2 operation check: the voltage across CN12BCR-1 on BCR Board and GND is DC0 V when the sensor is blocked and DC5 V when the sensor is unblocked. NO Change Scanner Home Position Sensor 2. 9 Scanner Home Position Sensor 2 operation check: the voltage across CN1BCR-27 on BCR Board and GND is DC0 V when the sensor is blocked and DC5 V when the sensor is unblocked. YES Change BCR Board. NO Change MFB2 Board. Change Master Board.

• Code: C0651
• Description: Faulty Scanner Home Position Sensor 2
  When the Start key is pressed with a document loaded in the Document Feed Tray of the ADF, Scanner Home Position Sensor 2 is not blocked (L) even when the Scanner moves 463 mm to the left after the sensor has been unblocked (H).
• Remedy: 1 Scanner Motor operation check: Select functions in the following order: Tech. Rep. Mode - Movement Check - Scanner; set +1000 in Relative Position?h and touch Set?h; the Scanner moves at this time. YES Check step 3 and onward. 2 The Scanner can be moved manually. YES Change Scanner Motor. Change BCR Board. Change MFB2 Board. Change Master Board. NO Correct drive coupling. 3 C0651 is displayed. YES Check step 7 and onward. 4 Scanner Home Position Sensor 1 operation check through I/O check YES Check to see if Scanner Home Position Sensor 1 is blocked as the Scanner is moved. If it is checked okay, change Master Board. 5 Scanner Home Position Sensor 1 operation check: the voltage across CN11BCR-1 on BCR Board and GND is DC0 V when the sensor is blocked and DC5 V when the sensor is unblocked. NO Change Scanner Home Position Sensor 1. 6 Scanner Home Position Sensor 1 operation check: the voltage across CN1BCR-26 on BCR Board and GND is DC0 V when the sensor is blocked and DC5 V when the sensor is unblocked. YES Change BCR Board. NO Change MFB2 Board. Change Master Board. 7 Scanner Home Position Sensor 2 operation check through I/O check YES Check to see if Scanner Home Position Sensor 2 is blocked as the Scanner is moved. If it is checked okay, change Master Board. 8 Scanner Home Position Sensor 2 operation check: the voltage across CN12BCR-1 on BCR Board and GND is DC0 V when the sensor is blocked and DC5 V when the sensor is unblocked. NO Change Scanner Home Position Sensor 2. 9 Scanner Home Position Sensor 2 operation check: the voltage across CN1BCR-27 on BCR Board and GND is DC0 V when the sensor is blocked and DC5 V when the sensor is unblocked. YES Change BCR Board. NO Change MFB2 Board. Change Master Board.

• Code: C0990
• Description: LCC Lift-Up Motor failure to turn
• Remedy: 1 The voltage across CN1A-15 on LCC Control Board and GND is DC24 V. YES Change LCC Lift-Up Motor. Change LCC Control Board. Change Control Board. Change Master Board. 2 Fuse is conducting. YES Change Power Supply Unit. NO Change fuse.

• Code: C0991
• Description: Lift 1 ascent motion failure
• Remedy: 1 Lift-Up Sensor 1 operation check through I/O check YES Check step 3 and onward. 2 Lift-Up Sensor 1 operation check: the voltage across CN4A-6 on LCC Control Board and GND is DC5 V when the sensor is blocked and DC0 V when the sensor is unblocked. YES Change LCC Control Board. Change Control Board. Change Master Board. NO Check actuator. Change Lift-Up Sensor 1. 3 LCC Lift-Up Motor operation check: LCC Lift- Up Motor turns after the cassette has been slid into the copier. YES Change Master Board. 4 LCC Lift-Up Motor operation check: the voltage across CN5A-1 on LCC Control Board and GND changes from DC0 V to DC24 V while step 3 is being performed. YES Change LCC Lift-Up Motor. NO Change LCC Control Board. Change Control Board. Change Master Board.

• Code: C0995
• Description: LCC Transport Motor failure to turn
• Remedy: 1 The voltage across CN1A-15 on LCC Control Board and GND is DC24 V. YES Change LCC Transport Motor. Change LCC Control Board. Change Control Board. Change Master Board. 2 Fuse is conducting. YES Change Power Supply Unit. NO Change fuse.

• Code: C0999
• Description: Lift 2 ascent motion failure
• Remedy: 1 Lift-Up Sensor 2 operation check through I/O check YES Check step 3 and onward. 2 Lift-Up Sensor 2 operation check: the voltage across CN4A-9 on LCC Control Board and GND is DC5 V when the sensor is blocked and DC0 V when the sensor is unblocked. YES Change LCC Control Board. Change Control Board. Change Master Board. NO Check actuator. Change Lift-Up Sensor 2. 3 LCC Lift-Up Motor operation check: LCC Lift- Up Motor turns after the cassette has been slid into the copier. YES Change Master Board. 4 LCC Lift-Up Motor operation check: the voltage across CN5A-2 on LCC Control Board and GND changes from DC0 V to DC24 V while step 3 is being performed. YES Change LCC Lift-Up Motor. NO Change LCC Control Board. Change Control Board. Change Master Board.