• Code: 7004
• Description: Toner motor Y error During driving the toner motor, an over-current detection signal is detected for 40 ms successively. When detected during warming up The message of "Shake the toner container (Y)" is displayed. (exited by the opening and closing of the inner tray) Repeat the operation above, for three times. Four times or more, if an over-current detection signal is detected for 5 s successively, a service call error message appears.
• Remedy: Toner container Yellow 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 gears rotate smoothly. If not, clean or grease the bushes and gears. 2. Check broken couplings and gears, and replace if any.
  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 other component, or has defect conduction, replace it. Toner motor and Engine relay PWB (YC18) Engine relay PWB (YC1) and Main/Engine PWB (YC4)
  Toner motor 1. Check how the toner motor is attached. 2. Replace the toner motor.
  Engine relay PWB Replace the engine 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: 7101
• Description: Toner sensor K error For a certain period of time, the sensor output value is less than 0.1V, or more than 3.2V.
• Remedy: Toner container Black 1. Check that the toner container has been properly installed, and if necessary, reinstall. 2. Check that the toner supply inlet of the toner container can be opened by the lever operation. 3. Replace the toner container.
  Primary transfer unit 1. Check whether the toner supply inlet at the upper side of the unit opens by attaching the toner container. 2. Check whether the toner supply inlet at the lower side of the unit is open by the lever operation. 3. Check if toner is clogged in the toner supplying pass in the cleaning section. 4. Replace the primary transfer unit.
  Developer unit (toner sensor) 1. Confirm that the connector of the developer unit is firmly connected, and if necessary, push the unit all the way in. Developer unit (toner sensor) and Drum relay PWB (YC6) Drum relay PWB (YC1) and Main/Engine PWB (YC15) 2. If the wire is disconnected, short-circuited or has 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 motor 1. Check that the toner motor is properly attached. 2. Check the couplings and gears can rotate or 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 motor and Engine relay PWB (YC18) Engine relay PWB (YC1) and Main/Engine PWB (YC4) 4. If the wire is disconnected, short-circuited or has ground fault, or the connector pin is deformed, replace the wire. 5. Replace the toner motor.
  Drum relay PWB Replace the drum relay PWB.
  Engine relay PWB Replace the engine 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 C error For a certain period of time, the sensor output value is less than 0.1V, or more than 3.2V.
• Remedy: Toner container Cyan 1. Check that the toner container has been properly installed, and if necessary, reinstall. 2. Check that the toner supply inlet of the toner container can be opened by the lever operation. 3. Replace the toner container.
  Primary transfer unit 1. Check whether the toner supply inlet at the upper side of the unit opens by attaching the toner container. 2. Check whether the toner supply inlet at the lower side of the unit is open by the lever operation. 3. Check if toner is clogged in the toner supplying pass in the cleaning section. 4. Replace the primary transfer unit.
  Developer unit (toner sensor) 1. Confirm that the connector of the developer unit is firmly connected, and if necessary, push the unit all the way in. Developer unit (toner sensor) and Drum relay PWB (YC8) Drum relay PWB (YC1) and Main/Engine PWB (YC15) 2. If the wire is disconnected, short-circuited or has 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 motor 1. Check that the toner motor is properly attached. 2. Check the couplings and gears can rotate or 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 motor and Engine relay PWB (YC18) Engine relay PWB (YC1) and Main/Engine PWB (YC4) 4. If the wire is disconnected, short-circuited or has ground fault, or the connector pin is deformed, replace the wire. 5. Replace the toner motor.
  Drum relay PWB Replace the drum relay PWB.
  Engine relay PWB Replace the engine 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 M error For a certain period of time, the sensor output value is less than 0.1V, or more than 3.2V.
• Remedy: Toner container Magenta 1. Check that the toner container has been properly installed, and if necessary, reinstall. 2. Check that the toner supply inlet of the toner container can be opened by the lever operation. 3. Replace the toner container.
  Primary transfer unit 1. Check whether the toner supply inlet at the upper side of the unit opens by attaching the toner container. 2. Check whether the toner supply inlet at the lower side of the unit is open by the lever operation. 3. Check if toner is clogged in the toner supplying pass in the cleaning section. 4. Replace the primary transfer unit.
  Developer unit (toner sensor) 1. Confirm that the connector of the developer unit is firmly connected, and if necessary, push the unit all the way in. Developer unit (toner sensor) and Drum relay PWB (YC7) Drum relay PWB (YC1) and Main/Engine PWB (YC15) 2. If the wire is disconnected, short-circuited or has 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 motor 1. Check that the toner motor is properly attached. 2. Check the couplings and gears can rotate or 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 motor and Engine relay PWB (YC1) Engine relay PWB (YC1) and Main/Engine PWB (YC4) 4. If the wire is disconnected, short-circuited or has ground fault, or the connector pin is deformed, replace the wire. 5. Replace the toner motor.
  Drum relay PWB Replace the drum relay PWB.
  Engine relay PWB Replace the engine 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 Y error For a certain period of time, the sensor output value is less than 0.1V, or more than 3.2V.
• Remedy: Toner container Yellow 3. Check that the toner container has been properly installed, and if necessary, reinstall. 4. Check that the toner supply inlet of the toner container can be opened by the lever operation. 5. Replace the toner container.
  Primary transfer unit 1. Check whether the toner supply inlet at the upper side of the unit opens by attaching the toner container. 2. Check whether the toner supply inlet at the lower side of the unit is open by the lever operation. 3. Check if toner is clogged in the toner supplying pass in the cleaning section. 4. Replace the primary transfer unit.
  Developer unit (toner sensor) 1. Confirm that the connector of the developer unit is firmly connected, and if necessary, push the unit all the way in. Developer unit (toner sensor) and Drum relay PWB (YC9) Drum relay PWB (YC1) and Main/Engine PWB (YC4) 2. If the wire is disconnected, short-circuited or has 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 motor 1. Check that the toner motor is properly attached. 2. Check the couplings and gears can rotate or 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 motor and Engine relay PWB (YC18) Engine relay PWB (YC1) and Main/Engine PWB (YC4) 4. If the wire is disconnected, short-circuited or has ground fault, or the connector pin is deformed, replace the wire. 5. Replace the toner motor.
  Drum relay PWB Replace the drum relay PWB.
  Engine relay PWB Replace the engine 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: 7200
• Description: Broken inner thermistor wire (Developer) The sensor input sampling is greater than the reference value. (After detection, controlled at 25 °C/77.0 °F)
• Remedy: Developer unit K 1. Confirm that the connector of developer unit K is firmly connected, and if necessary, push the unit all the way in. Developer unit K (toner sensor) and Drum relay PWB (YC6) Drum relay PWB (YC1) and Main/Engine PWB (YC4) 2. If the wire is disconnected, short-circuited or has ground fault, or the connector pin is deformed, replace the wire. 3. Replace the developer unit K.
  Drum relay PWB Replace the drum 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: 7201
• Description: Short-circuited inner thermistor (Developer) The sensor input sampling is less than the reference value. (After detection, controlled at 25 °C/77.0 °F)
• Remedy: Developer unit K 1. Confirm that the connector of developer unit K is firmly connected, and if necessary, push the unit all the way in. Developer unit K (toner sensor) and Drum relay PWB (YC6) Drum relay PWB (YC1) and Main/Engine PWB (YC15) 2. If the wire is disconnected, short-circuited or has ground fault, or the connector pin is deformed, replace the wire. 3. Replace the developer unit K.
  Drum relay PWB Replace the drum 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: 7221
• Description: Broken inner thermistor wire (LSU Magenta & Black) The sensor input sampling is greater than the reference value. (After detection, controlled at 25 °C/77.0 °F)
• Remedy: LSU (Magenta & Black) 1. Confirm that the wiring connector of LSU (Magenta & Black) is firmly connected, and if necessary, connect the connector all the way in. LSU (Magenta & Black) and Main/ Engine PWB (YC2016) 2. If the wire is disconnected, short-circuited or has ground fault, or the connector pin is deformed, replace the wire. 3. Replace the LSU (Magenta & Black).
  Main/Engine PWB 1. Check the engine firmware and upgrade to the latest version if necessary. 2. Replace the Main/Engine PWB.