• Code: 6030
• Description: Upper fuser thermistor broken detection
  • No temperature detection output is obtained from the upper fuser thermistor.
• Causes: Defective engine controller PWB (KP-992). Defective fuser PWB (KP-997). Defective upper fuser thermistor, or improper fitting.. Defective harness (2CK2719, 2CK2712) between engine controller PWB (KP-992) and paper feeder/ options relay PWB (KP-995) and fuser unit, or poor contact of the connector terminals.
• Remedy: Replace the engine controller PWB (KP- 992). Replace the fuser unit (fuser PWB [KP- 997]). Replace the fuser unit (upper fuser thermistor). Check the continuity of the harness (2CK2719, 2CK2712). Check the insertion of connectors.

• Code: 6040
• Description: Upper fuser thermistor abnormal temperature detection
  • The temperature detection output from the upper fuser thermistor is abnormal change.
• Causes: Defective engine controller PWB (KP-992). Defective fuser PWB (KP-992). Defective upper fuser thermistor, or fitting is not proper. Defective harness (2CK2719, 2CK2712) between engine controller PWB (KP-992) and paper feeder/ options relay PWB (KP-995) and fuser unit, or poor contact of the connector terminals.
• Remedy: Replace the engine controller PWB (KP- 992). Replace the fuser unit (fuser PWB [KP- 992]). Replace the fuser unit (upper fuser thermistor). Check the continuity of the harness (2CK2719, 2CK2712). Check the insertion of connectors.

• Code: 6100
• Description: Press/heat roller heating time-out 1
  • The temperature on the press/heat roller does not rise within the predetermined period when ASIC (U8) on the engine controller PWB (KP-992) has turned on the lower heater lamp. This is detected when the lower heater lamp is turned on.
• Causes: Defective engine controller PWB (KP-992). Defective lower heater lamp. Defective lower thermostat. Defective fuser PWB (KP-997). Defective lower fuser thermistor, or fitting is not proper. Defective power supply unit. Defective harness (2CK2719, 2CK2712) between engine controller PWB (KP-992) and paper feeder/options relay PWB (KP-995) and fuser unit, or poor contact of the connector terminals.
• Remedy: Replace the engine controller PWB (KP- 992). Replace the fuser unit (lower heater lamp). Replace the fuser unit (lower thermostat). Replace the fuser unit (fuser PWB [KP- 997]). Replace the fuser unit (lower fuser thermistor). Replace the power supply unit. Check the continuity of the harness (2CK2719, 2CK2712). Check the insertion of connectors.

• Code: 6110
• Description: Press/heat roller heating time-out 2
  • The temperature on the press/heat toller does not reach the correct temperature within the predetermined period after self-diagnostic code 6100 is cleared. The period for detection is longer than the condition for selfdiagnostics code 6100.
• Causes: Defective engine controller PWB (KP-992). Defective lower heater lamp. Defective lower thermostat. Defective fuser PWB (KP-997). Defective lower fuser thermistor, or fitting is not proper. Defective AC power source (Abnormal low voltage). Defective harness (2CK2719, 2CK2712) between engine controller PWB (KP-992) and paper feeder/ options relay PWB (KP- 995) and fuser unit, or poor contact of the connector terminals.
• Remedy: Replace the engine controller PWB (KP- 992). Replace the fuser unit (lower heater lamp). Replace the fuser unit (lower thermostat). Replace the fuser unit (fuser PWB [KP- 997]). Replace the fuser unit (upper fuser thermistor). Connect to the proper AC power source. Check the continuity of the harness (2CK2719, 2CK2712). Check the insertion of connectors.

• Code: 6120
• Description: Press/heat roller abnormal high temperature
  • The temperature on the press/heat roller has risen up to the predetermined abnormal temperature.
• Causes: Defective engine controller PWB (KP-992). Defective lower heater lamp. Defective fuser PWB (KP-997). Defective lower fuser thermistor. Defective power supply unit. Defective AC power source (Abnormal high voltage). Defective harness (2CK2719, 2CK2712) between engine controller PWB (KP-992) and paper feeder/ options relay PWB (KP-995) and fuser unit, or poor contact of the connector terminals.
• Remedy: Replace the engine controller PWB (KP- 992). Replace the fuser unit (lower heater lamp). Replace the fuser unit (lower thermostat). Replace the fuser unit (lower fuser thermistor). Replace the power supply unit. Connect to the proper AC power source. Check the continuity of the harness (2CK2719, 2CK2712). Check the insertion of connectors.

• Code: 6130
• Description: Lower fuser thermistor broken detection
  • The temperature detection is not obtained from the lower fuser thermistor.
• Causes: Defective engine controller PWB (KP-992). Defective fuser PWB (KP-997). Defective lower fuser thermistor, or improper fitting. Defective harness (2CK2719, 2CK2712) between engine controller PWB (KP-992) and paper feeder/ options relay PWB (KP-995) and fuser unit, or poor contact of the connector terminals.
• Remedy: Replace the engine controller PWB (KP- 992). Replace the fuser unit (fuser PWB [KP- 997]). Replace the fuser unit (lower fuser thermistor). Check the continuity of the harness (2CK2719, 2CK2712). Check the insertion of connectors.

• Code: 6140
• Description: Lower fuser thermistor abnormal temperature detection
  • The temperature detection output from the lower fuser thermistor is out of the normal range.
• Causes: Defective engine controller PWB (KP-992). Defective fuser PWB (KP-997). Defective lower fuser thermistor, or fitting is not proper. Defective harness (2CK2719, 2CK2712) between engine controller PWB (KP-992) and paper feeder/ options relay PWB (KP-995) and fuser unit, or poor contact of the connector terminals.
• Remedy: Replace the engine controller PWB (KP- 992). Replace the fuser unit (fuser PWB [KP- 997]). Replace the fuser unit (lower fuser thermistor). Check the continuity of the harness (2CK2719, 2CK2712). Check the insertion of connectors.

• Code: 7001
• Description: Black toner feed motor lock
  • The revolution of the black toner feed motor does not reach the predetermined revolution within the predetermined period when ASIC (U8) on the engine controller PWB (KP-992) activates the black toner feed motor.
• Causes: Defective engine controller PWB (KP-992). Defective black developer (Black developer PWB [KP-1003]). Defective harness (2CK2702, 2CK2706) between engine controller PWB (KP-992) and black developer, or poor contact of the connector terminals.
• Remedy: Replace the engine controller PWB (KP- 992). Replace the black developer. See page 1- 6-16. Check the continuity of the harness (2CK2702, 2CK2706). Check the insertion of connectors.