• Code: 6250
• Description: Fuser thermistor 2 Low temperature error In case the temperature detected by the fuser thermistor 2 (edge) continues 100 °C/212.0 °F or less for 1 second during ready and printing. In case the temperature detected by the fuser thermistor 2 (edge) continues 60 °C/140.0 °F or less for 1 second during low power mode.
• Remedy: Reduction of the power supply voltage 1. Check that no voltage drop of more than 10% of the rated is caused during printing. 2. If the power is overloaded, change the AC outlet that supplies power.
  Fuser unit 1. Make sure there is no paper jam. 2. Confirm that the wiring connector is firmly connected, and if necessary, connect the connector all the way in. Fuser unit - Engine PWB(YC7): 30 ppm model - Engine PWB(YC11): 35/40 ppm models 3. If the wiring is disconnected, short-circuited or has a ground fault, replace the wire. 4. If the fuser heater is not turned on (broken thermostat wire), replace the fuser unit.
  Low voltage power supply PWB 1. Confirm that the wiring connector is firmly connected, and if necessary, connect the connector all the way in. Low voltage power supply PWB - Engine PWB(YC105): 30 ppm model - Engine PWB(YC40): 35/40 ppm models 2. Replace the low voltage power supply PWB.
  Engine PWB 1. Check the engine firmware and upgrade to the latest version if necessary. 2. Replace the engine PWB.

• Code: 6400
• Description: Zero-cross signal error During the fuser heater on, the zero-cross signal is not input for 1 s successively.
• Remedy: Low voltage power supply PWB 1. Confirm that the wiring connector is firmly connected, and if necessary, connect the connector all the way in. Low voltage power supply PWB - Engine PWB(YC105): 30 ppm model - Engine PWB(YC40): 35/40 ppm models 2. Replace the low voltage power supply PWB.
  Engine PWB 1. Check the engine firmware and upgrade to the latest version if necessary. 2. Replace the engine PWB.

• Code: 6610
• Description: The fuser pressure release error The fuser release sensor does not turn on or off, after 10 s from starting pressurization or depressurization operation.
• Remedy: Fuser unit 1. Make sure there is no paper jam. 2. Check if the fuser pressure can be reduced by inverse rotation of the fuser gear by hand. 3. Check if the envelope sensor light is blocked out by the actuator during depressurization operation. 4. Confirm that the wiring connector is firmly connected, and if necessary, connect the connector all the way in. Fuser pressure release sensor - Engine PWB(YC7): 30 ppm model - Engine PWB(YC11): 35/40 ppm models 5. If the wiring is disconnected, short-circuited or has a ground fault, replace the wire. 6. Replace the fuser unit.
  Fuser motor 1. Check if the fuser motor is rotating. 2. When turning the power on, check if the fuser motor rotates reversely. 3. Confirm that the wiring connector is firmly connected, and if necessary, connect the connector all the way in. Fuser motor - Engine PWB (YC17): 30 ppm model - Engine PWB(YC24): 35/40 ppm models 4. If the wiring is disconnected, short-circuited or has a ground fault, replace the wire. 5. Replace the fuser motor.
  Engine PWB 1. Check the engine firmware and upgrade to the latest version if necessary. 2. Replace the engine PWB.

• Code: 6910
• Description: Engine firmware unexpected error The drum motor drive continued more than 60 minutes except during printing. (engine lock) In case the developer bias is detected as on for 3340ms or more while the main charge bias is off. Backup task was not processed for 30s or more.
• Remedy: Engine PWB 1. Unplug the power cord from the wall outlet, and wait five seconds. Then plug in the power cord and then turn on the power switch. 2. Check if the engine PWB is properly secured with screws. (Ground Confirmation) 3. Check that the connectors on the engine PWB are properly connected, and if not, re-connect them. 4. Check the engine firmware and upgrade to the latest version if necessary. 5. Replace the engine PWB.

• Code: 7001
• Description: Toner motor error(Black) In case the toner container rotation detection pulse signal does not change for 500ms in succession when turning the toner motor on, "Shake the toner container." message is indicated. (Resets by front cover open/close) The toner container rotation detection signals does change after repeating the above operation three times.
• Remedy: Toner container 1. Check that the spiral of the toner container can be rotated by hand 2. Replace the toner container.
  Drive transmission system for the toner motor 1. Check if the couplings and gears rotate smoothly, and if not, clean or grease the gears. 2. Check for broken couplings and gears, and replace if any are found.
  Defective connector cable or poor contact in the connector 1. Reconnect the connector if its connection is loose. 2. If a wire is pinched by another component, or has defective conduction, replace it. Toner motor - Engine PWB(YC14): 30 ppm model - Engine PWB(YC21): 35/40 ppm models
  Toner motor 1. Check how the toner motor is attached. 2. Replace the toner motor.
  Engine PWB 1. Check the engine firmware and upgrade to the latest version if necessary. 2. Replace the engine PWB.

• Code: 7002
• Description: Toner motor error(Cyan) In case the toner container rotation detection pulse signal does not change for 500ms in succession when turning the toner motor on, "Shake the toner container." message is indicated. (Resets by front cover open/close) The toner container rotation detection signals does change after repeating the above operation three times.
• Remedy: Toner container 1. Check that the spiral of the toner container can be rotated by hand 2. Replace the toner container.
  Drive transmission system for the toner motor 1. Check if the couplings and gears rotate smoothly, and if not, clean or grease the gears. 2. Check for broken couplings and gears, and replace if any are found.
  Defective connector cable or poor contact in the connector 1. Reconnect the connector if its connection is loose. 2. If a wire is pinched by another component, or has defective conduction, replace it. Toner motor - Engine PWB(YC14): 30 ppm model - Engine PWB(YC21): 35/40 ppm models
  Toner motor 1. Check how the toner motor is attached. 2. Replace the toner motor.
  Engine PWB 1. Check the engine firmware and upgrade to the latest version if necessary. 2. Replace the engine PWB.

• Code: 7003
• Description: Toner motor error (Magenta) In case the toner container rotation detection pulse signal does not change for 500ms in succession when turning the toner motor on, "Shake the toner container." message is indicated. (Resets by front cover open/close) The toner container rotation detection signals does change after repeating the above operation three times.
• Remedy: Toner container 1. Check that the spiral of the toner container can be rotated by hand 2. Replace the toner container.
  Drive transmission system for the toner motor 1. Check if the couplings and gears rotate smoothly, and if not, clean or grease the gears. 2. Check for broken couplings and gears, and replace if any are found.
  Defective connector cable or poor contact in the connector 1. Reconnect the connector if its connection is loose. 2. If a wire is pinched by another component, or has defective conduction, replace it. 3. Toner motor - Engine PWB(YC14): 30 ppm model - Engine PWB(YC21): 35/40 ppm models
  Toner motor 1. Check how the toner motor is attached. 2. Replace the toner motor.
  Engine PWB 1. Check the engine firmware and upgrade to the latest version if necessary. 2. Replace the engine PWB.

• Code: 7004
• Description: Toner motor error (Yellow) In case the toner container rotation detection pulse signal does not change for 500ms in succession when turning the toner motor on, "Shake the toner container." message is indicated. (Resets by front cover open/close) The toner container rotation detection signals does change after repeating the above operation three times
• Remedy: Toner container 1. Check that the spiral of the toner container can be rotated by hand 2. Replace the toner container.
  Drive transmission system for the toner motor 1. Check if the couplings and gears rotate smoothly, and if not, clean or grease the gears. 2. Check for broken couplings and gears, and replace if any are found.
  Defective connector cable or poor contact in the connector 1. Reconnect the connector if its connection is loose. 2. If a wire is pinched by another component, or has defective conduction, replace it. Toner motor - Engine PWB(YC14): 30 ppm model - Engine PWB(YC21): 35/40 ppm models
  Toner motor 1. Check how the toner motor is attached. 2. Replace the toner motor.
  Engine PWB 1. Check the engine firmware and upgrade to the latest version if necessary. 2. Replace the engine PWB.