• Code: 2510
• Description: Paper feed motor starting error
  • No FG (Frequency generation) pulse is entered within the predetermined period when ASIC (U8) on the engine controller PWB (KP-992) has issued a motor activation signal to the paper feed motor.
• Causes: Defective engine controller PWB (KP-992). Defective paper feed motor. Excessive torque for driving paper feed unit. (Overloaded by a damaged gear.) Defective harness (2CK2707) between engine controller PWB (KP-992) and paper feed motor, or poor contact of the connector terminals.
• Remedy: Replace the engine controller PWB (KP- 992). Replace the paper feed motor. Check if the paper feed unit rotates smoothly. Check for broken gears. Replace if any. Check the continuity of the harness (2CK2707). Check the insertion of connectors.

• Code: 2520
• Description: Paper feed motor starting time-out
  • The FG (Frequency generation) pulse does not reach the correct frequency within the predetermined period when ASIC (U2) on the engine controller PWB (KP-992) has issued a motor activation signal to the paper feed motor.
• Causes: Defective engine controller PWB (KP-992). Defective paper feed motor. Excessive torque for driving paper feed unit. (Overloaded by a damaged gear.) Defective harness (2CK2707) between engine controller PWB (KP-992) and paper feed motor, or poor contact of the connector terminals.
• Remedy: Replace the engine controller PWB (KP- 992). Replace the paper feed motor. Check if the paper feed unit rotates smoothly. Check for broken gears. Replace if any. Check the continuity of the harness (2CK2707). Check the insertion of connectors.

• Code: 4000
• Description: Polygon motor error
  • The ready signal (SCRDY) is not entered within the predetermined period when CPU (U2) on the engine controller PWB (KP-992) has issued a motor activation signal to the laser scanner unit.
• Causes: Defective engine controller PWB (KP-992). Defective laser scanner unit (PD PWB [KP-838]). Defective harness (2BM2852) between engine controller PWB (KP-992) and laser scanner unit, or poor contact of the connector terminals.
• Remedy: Replace the engine controller PWB (KP- 992). Replace the laser scanner unit. Check the continuity of the harness (2BM2852). Check the insertion of connectors.

• Code: 4200
• Description: Horizontal synchronized signal (PD) detection error
  • The horizontal synchronization signal (PD) is not entered by the laser scanner unit when ASIC (U8) on the engine controller PWB (KP-992) has issued a laser activation signal.
• Causes: Defective engine controller PWB (KP-992). Defective laser scanner unit (PD PWB [KP-838]). Defective harness (S02542) between engine controller PWB (KP-992) and laser scanner unit, or poor contact of the connector terminals.
• Remedy: Replace the engine controller PWB (KP- 992). Replace the laser scanner unit. Check the continuity of the harness (2BM2852). Check the insertion of connectors.

• Code: 5300
• Description: Eraser lamp broken detection
  • The current at the correct level is not detected when ASIC (U8) on the engine controller PWB (KP-992) generates the signal to activate the eraser lamp.
• Causes: Defective engine controller PWB (KP-992). Defective drum unit (eraser lamp or drum PWB [KP- 813]). Defective harness (2BM2864) between engine controller PWB (KP-992) and drum unit, or poor contact of the connector terminals.
• Remedy: Replace the engine controller PWB (KP- 992). Replace the drum unit. Check the continuity of the harness (2BM2864). Check the insertion of connectors.

• Code: 6000
• Description: Heat roller heating time-out 1
  • The temperature on the heat roller does not rise within the predetermined period when ASIC (U8) on the engine controller PWB (KP-992) has turned on the upper heater lamp. This is detected when the upper heater lamp is turned on.
• Causes: Defective engine controller PWB (KP-992). Defective upper heater lamp. Defective upper thermostat. Defective fuser PWB (KP-997). Defective upper 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 (upper heater lamp). Replace the fuser unit (upper thermostat). Replace the fuser unit (fuser PWB [KP- 997]). Replace the fuser unit (upper fuser thermistor). Replace the power supply unit. Check the continuity the harness (2CK2719, 2CK2712). Check the insertion of connectors.

• Code: 6010
• Description: Heat roller heating time-out 2
  • The temperature on the heat toller does not reach the correct temperature within the predetermined period after self-diagnostic code 6000 is cleared. The period for detection is longer than the condition for selfdiagnostics code 6000.
• Causes: Defective engine controller PWB (KP-992). Defective upper heater lamp. Defective upper thermostat. Defective fuser PWB (KP-997). Defective upper 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 (upper heater lamp). Replace the fuser unit (upper thermostat). Replace the fuser unit (fuser PWB [KP- 811]). 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: 6020
• Description: Heat roller abnormal high temperature
  • The temperature on the heat roller has risen up to the abnormal temperature.
• Causes: Defective engine controller PWB (KP-992). Defective upper heater lamp. Defective fuser PWB (KP-997). Defective upper 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 (upper heater lamp). Replace the fuser unit (fuser PWB [KP- 997]). Replace the fuser unit (upper 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.