• Code: 6030
• Description: Fuser thermistor wire break The average AD value from ten values at every 2ms while deducting the maximum and minimum values is monitored at every 100ms and it is detected at the wire break level (1020 or more).
• Remedy: 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 - Main/Engine PWB(YC23) 3. If the wiring is disconnected, short-circuited or has a ground fault, replace the wire. 4. Replace the fuser unit.
  Main/Engine PWB 1. Check the engine firmware and upgrade to the latest version if necessary. 2. Replace the main/engine PWB.

• Code: 6050
• Description: Fuser thermistor Low temperature error In case the temperature detected by the fuser thermistor (edge) continues 80 °C/176.0 °F or less for 1 second during ready or printing.
• 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 - Main/Engine PWB(YC23) 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 - Main/Engine PWB(YC1) 2. Replace the low voltage power supply PWB.
  Main/Engine PWB 1. Check the engine firmware and upgrade to the latest version if necessary. 2. Replace the main/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 - Maine/Engine PWB(YC1)Replace the main/engine PWB.
  Main/Engine PWB 1. Check the engine firmware and upgrade to the latest version if necessary. 2. Replace the main/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 - container relay PWB (YC2) 5. If the wiring is disconnected, short-circuited or has a ground fault, replace the wire. 6. Replace the fuser unit.
  Main/Engine PWB 1. Check the engine firmware and upgrade to the latest version if necessary. 2. Replace the main/engine PWB.

• Code: 7101
• Description: Toner sensor error (Black) For a certain period of time, the sensor output value is less than 0.1V, or more than 3.2V
• Remedy: Toner container 1. Check that the toner container is properly installed, and if necessary, re-install. 2. Check that the toner supply inlet of the toner container can be opened by the lever operation. 3. Replace the toner container.
  Toner Sensor 1. Confirm that the connector of the developer unit is firmly connected, and if necessary, push the unit all the way in. Toner sensor - Unit relay PWB Unit relay PWB - Main/Engine PWB(YC7) 2. If the wire is disconnected, short-circuited or has a ground fault, or the connector pin is deformed, replace the wire. 3. Check if the gears and spirals in the developer unit rotate smoothly. 4. Replace the developer unit.
  Toner Solenoid 1. Check that the toner solenoid is properly attached. 2. Check if the couplings and gears can rotate or if they are not unusually loaded, and if necessary, replace. 3. Confirm that the wiring connector is firmly connected, and if necessary, connect the connector all the way in. Toner solenoid - container relay PWB (YC3) 4. If the wire is disconnected, short-circuited or has a ground fault, or the connector pin is deformed, replace the wire. 5. Change the toner solenoid.
  Unit relay PWB Replace the unit relay PWB.
  Main/Engine PWB 1. Check the engine firmware and upgrade to the latest version if necessary. 2. Replace the main/engine PWB.

• Code: 7102
• Description: Toner sensor error (Cyan) For a certain period of time, the sensor output value is less than 0.1V, or more than 3.2V.
• Remedy: Toner container 1. Check that the toner container is properly installed, and if necessary, re-install. 2. Check that the toner supply inlet of the toner container can be opened by the lever operation. 3. Replace the toner container.
  Toner Sensor 1. Confirm that the connector of the developer unit is firmly connected, and if necessary, push the unit all the way in. Toner sensor - Unit relay PWB Unit relay PWB - Main/Engine PWB(YC7) 2. If the wire is disconnected, short-circuited or has a ground fault, or the connector pin is deformed, replace the wire. 3. Check if the gears and spirals in the developer unit rotate smoothly. 4. Replace the developer unit.
  Toner Solenoid 1. Check that the toner solenoid is properly attached. 2. Check if the couplings and gears can rotate or if they are not unusually loaded, and if necessary, replace. 3. Confirm that the wiring connector is firmly connected, and if necessary, connect the connector all the way in. Toner solenoid - container relay PWB (YC3) 4. If the wire is disconnected, short-circuited or has a ground fault, or the connector pin is deformed, replace the wire. 5. Change the toner solenoid.
  Unit relay PWB Replace the unit relay PWB.
  Main/Engine PWB 1. Check the engine firmware and upgrade to the latest version if necessary. 2. Replace the main/engine PWB.

• Code: 7103
• Description: Toner sensor error (Magenta) For a certain period of time, the sensor output value is less than 0.1V, or more than 3.2V.
• Remedy: Toner container 1. Check that the toner container is properly installed, and if necessary, re-install. 2. Check that the toner supply inlet of the toner container can be opened by the lever operation. 3. Replace the toner container.
  Toner Sensor 1. Confirm that the connector of the developer unit is firmly connected, and if necessary, push the unit all the way in. Toner sensor - Unit relay PWB Unit relay PWB - Main/Engine PWB(YC7) 2. If the wire is disconnected, short-circuited or has a ground fault, or the connector pin is deformed, replace the wire. 3. Check if the gears and spirals in the developer unit rotate smoothly. 4. Replace the developer unit.
  Toner Solenoid 1. Check that the toner solenoid is properly attached. 2. Check if the couplings and gears can rotate or if they are not unusually loaded, and if necessary, replace. 3. Confirm that the wiring connector is firmly connected, and if necessary, connect the connector all the way in. Toner solenoid - container relay PWB (YC3) 4. If the wire is disconnected, short-circuited or has a ground fault, or the connector pin is deformed, replace the wire. 5. Change the toner solenoid.
  Unit relay PWB Replace the unit relay PWB.
  Main/Engine PWB 1. Check the engine firmware and upgrade to the latest version if necessary. 2. Replace the main/engine PWB.

• Code: 7104
• Description: Toner sensor error (Yellow) For a certain period of time, the sensor output value is less than 0.1V, or more than 3.2V.
• Remedy: Toner container 1. Check that the toner container is properly installed, and if necessary, re-install. 2. Check that the toner supply inlet of the toner container can be opened by the lever operation. 3. Replace the toner container.
  Toner Sensor 1. Confirm that the connector of the developer unit is firmly connected, and if necessary, push the unit all the way in. Toner sensor - Unit relay PWB Unit relay PWB - Main/Engine PWB(YC7) 2. If the wire is disconnected, short-circuited or has a ground fault, or the connector pin is deformed, replace the wire. 3. Check if the gears and spirals in the developer unit rotate smoothly. 4. Replace the developer unit.
  Toner Solenoid 1. Check that the toner solenoid is properly attached. 2. Check if the couplings and gears can rotate or if they are not unusually loaded, and if necessary, replace. 3. Confirm that the wiring connector is firmly connected, and if necessary, connect the connector all the way in. Toner solenoid - container relay PWB (YC3) 4. If the wire is disconnected, short-circuited or has a ground fault, or the connector pin is deformed, replace the wire. 5. Change the toner solenoid.
  Unit relay PWB Replace the unit relay PWB.
  Main/Engine PWB 1. Check the engine firmware and upgrade to the latest version if necessary. 2. Replace the main/engine PWB.