• Code: 4104
• Description: Laser BD (Yellow) error The laser can not be received for 1 s, after the Yellow laser emission starts.
• Remedy: LSU (Cyan, Yellow) 1. Confirm that the wiring connector is firmly connected, and if necessary, connect the connector all the way in. LSU and Main/engine PBW (YC2017) 2. If the wiring is disconnected, short-circuited or has ground fault, replace the wire. 3. Replace the LSU.
  Main/Engine PWB 1. Check both main and engine firmware, and upgrade to the latest version, if necessary. 2. Replace the Main/Engine PWB.

• Code: 4201
• Description: Laser BD (Black) steadystate error During the polygon motor steady rotation, the BD signal of Black is not detected.
• Remedy: LSU (Black, Magenta) 1. Confirm that the wiring connector is firmly connected, and if necessary, connect the connector all the way in. LSU and Main/engine PBW (YC2016) 2. If the wiring is disconnected, short-circuited or has ground fault, replace the wire. 3. Replace the LSU.
  Main/Engine PWB 1. Check both main and engine firmware, and upgrade to the latest version, if necessary. 2. Replace the Main/Engine PWB.

• Code: 4202
• Description: Laser BD (Cyan) steadystate error During the polygon motor steady rotation, the BD signal of Cyan is not detected.
• Remedy: LSU (Cyan, Yellow) 1. Confirm that the wiring connector is firmly connected, and if necessary, connect the connector all the way in. LSU and Main/engine PBW (YC2017) 2. If the wiring is disconnected, short-circuited or has ground fault, replace the wire. 3. Replace the LSU.
  Main/Engine PWB 1. Check both main and engine firmware, and upgrade to the latest version, if necessary. 2. Replace the Main/Engine PWB.

• Code: 4203
• Description: Laser BD (Magenta) steadystate error During the polygon motor steady rotation, the BD signal of Magenta is not detected.
• Remedy: LSU (Black, Magenta) 1. Confirm that the wiring connector is firmly connected, and if necessary, connect the connector all the way in. LSU and Main/engine PBW (YC2016) 2. If the wiring is disconnected, short-circuited or has ground fault, replace the wire. 3. Replace the LSU.
  Main/Engine PWB 1. Check both main and engine firmware, and upgrade to the latest version, if necessary. 2. Replace the Main/Engine PWB.

• Code: 4204
• Description: Laser BD (Yellow) steadystate error During the polygon motor steady rotation, the BD signal of Yellow is not detected.
• Remedy: LSU (Cyan, Yellow) 1. Confirm that the wiring connector is firmly connected, and if necessary, connect the connector all the way in. LSU and Main/engine PBW (YC2017) 2. If the wiring is disconnected, short-circuited or has ground fault, replace the wire. 3. Replace the LSU.
  Main/Engine PWB 1. Check both main and engine firmware, and upgrade to the latest version, if necessary. 2. Replace the Main/Engine PWB.

• Code: 4600
• Description: LSU cleaning motor error During driving the LSU cleaning motor, an over-current is detected for 5 s successively.
• Remedy: LSU cleaning spiral 1. Execute [LSU cleaning] using [Adjustment/ Maintenance] of the system menu. 2. Check that the drive gear and cleaning spiral can rotate and they are not unusually loaded, and if necessary, clean and grease.
  LSU cleaning motor 1. Confirm that the LSU cleaning motor has been firmly attached. 2. Replace the LSU cleaning motor.
  Engine relay PWB 1. Reconnect the connector if its connection is loose. 2. If a wire is pinched by other component, or has defect conduction, replace it. LSU cleaning motor and Engine relay PWB (YC26) 3. Replace the engine relay PWB.

• Code: 4700
• Description: VIDEO_ASIC device error 1. Communication with the video ASIC has failed 5 times successively. 2. After writing to VIDEO ASIC, the error that the reading value from same address does not match occurs 8 times successively.
• Remedy: Main/Engine PWB 1. Unplug the power cord from the wall outlet, and wait five seconds. Then plug the power cord and then turn on the power switch. 2. Check that the connectors on the Main/ Engine PWB are properly connected, and if not, re-connect them. 3. Replace the Main/Engine PWB.

• Code: 5101
• Description: Main high-voltage error K (40 ppm model) When adjusting Vpp in the main charger adjustment, the inflowing current of the drum unit (K) is excessively low.
• Remedy: Drum unit 1. Confirm that the drum or the drum screw can rotate. 2. If it won’t rotate, replace the drum unit.
  Main charger roller unit 1. Confirm that the Main charger roller unit has been firmly attached. 2. Replace the Main charger roller unit.
  High-voltage PWB 1. Confirm that the wiring connector is firmly connected, and if necessary, connect the connector all the way in. High-voltage PWB (YC101) and Main/ Engine PBW (YC7) 2. If the wiring is disconnected, short-circuited or has ground fault, replace the wire. 3. Replace the High-voltage PWB.
  Main/Engine PWB 1. Check both main and engine firmware, and upgrade to the latest version, if necessary. 2. Replace the Main/Engine PWB.