• Code: 3500
• Description: Scanner - ASIC communication error A communication error is detected during communication. (Read-back values are different.)
• Remedy: CIS 1. Confirm that the wiring connector is firmly connected, and if necessary, connect the connector all the way in. CIS - Main/Engine PWB (YC506) 2. If the wiring is disconnected, shortcircuited or has a ground fault, replace the wire. 3. Replace the image scanner carriage and execute U411.
  Main/Engine PWB Replace the main/engine PWB.

• Code: 4000
• Description: Polygon motor initial error (LSU) The polygon motor ready signal is not detected when passing 10s after starting up the polygon motor
• Remedy: Laser scanner unit (LSU) 1. Confirm that the wiring connector is firmly connected, and if necessary, connect the connector all the way in. Polygon motor - Main/engine PWB (YC3) If the wiring is disconnected, short-circuited or has a ground fault, replace the wire. 2. Replace the LSU.
  Main/Engine PWB 1. Check the engine firmware and upgrade to the latest version if necessary. 2. Replace the main/engine PWB.

• Code: 4010
• Description: Polygon motor steady-state error (LSU) The polygon motor ready signal is not for consecutive 1s after the polygon motor is stabilized
• Remedy: Laser scanner unit (LSU) 1. Confirm that the wiring connector is firmly connected, and if necessary, connect the connector all the way in. Polygon motor - Main/engine PWB (YC3) If the wiring is disconnected, short-circuited or has a ground fault, replace the wire. 2. Replace the LSU.
  Main/Engine PWB 1. Check the engine firmware and upgrade to the latest version if necessary. 2. Replace the main/engine PWB.

• Code: 4201
• Description: BD steady-state error (LSU) BD was not obtained during the steady rotation
• Remedy: Laser scanner unit (LSU) 1. Confirm that the wiring connector is firmly connected, and if necessary, connect the connector all the way in. LSU - Main/Engine PWB (YC505) 2. If the wiring is disconnected, shortcircuited or has a ground fault, replace the wire. 3. Replace the LSU.
  Main/Engine PWB Replace the main/engine PWB.

• Code: 6000
• Description: Broken fuser heater wire (main) During warm-up, the temperature detected by the thermopile does not reach 100°C/212 °F when turning the heater on for consecutive 10s During warm up, the temperature detected by the thermopile does not reach the ready temperature when passing 30s after reaching 60°C/ 212°F.
• 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(YC19) 3. If the wiring is disconnected, shortcircuited 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. Heater - Low voltage power supply PWB (YC102) Low voltage power supply PWB - Main/ Engine PWB(YC20) 2. Replace the low voltage power supply PWB.
  Main/Engine PWB Replace the main/engine PWB.

• Code: 6020
• Description: Fuser thermopile high temperature error (main) During drive, the thermopile detected 200C/392 °F for 5s The temperature detected by the thermopile rose 18C/65 °F or more when passing 1s or more after the drive is stopped Detected temperature at that time is 200C/392 °or more
• Remedy: Thermopile 1. Reconnect the wire connector Replace the wire if there is no continuity. Thermopile - Main/engine PWB (YC2) 2. Check how the thermopile is attached. If not attached to the holder, correct it 3. Replace the thermopile if not repaired
  Fuser unit 1. Make sure there is no paper jam. 2. 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(YC20) 2. Replace the low voltage power supply PWB.
  Main/Engine PWB Replace the main/engine PWB.

• Code: 6030
• Description: Broken fuser thermopile wire (main) The thermopile detected an abnormal value
• Remedy: Thermopile 1. Reconnect the wire connector Replace the wire if there is no continuity. Thermopile - Main/engine PWB (YC2) 2. Replace the thermopile if not repaired
  Main/Engine PWB Replace the main/engine PWB.

• Code: 6050
• Description: Fuser thermopile low temperature error (main) During printing, the temperature detected by the thermopile is less than 100C/212°F for consecutive 3s
• Remedy: Power supply voltage 1. Check no voltage drop exceeding 10% of the rated during printing. 2. If the power is overloaded, change the AC outlet that supplies power.
  Thermopile 1. Reconnect the wire connector Replace the wire if there is no continuity. Thermopile - Main/engine PWB (YC2) 2. Check how the thermopile is attached. If not attached to the holder, correct it 3. Replace the thermopile if not repaired
  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(YC19) 3. If the wiring is disconnected, shortcircuited 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. Heater - Low voltage power supply PWB (YC102) Low voltage power supply PWB - Main/ Engine PWB(YC20) 2. Replace the low voltage power supply PWB.
  Main/Engine PWB Replace the main/engine PWB.