• Code: 4002
• Description: Polygon motor CY error
  The polygon motor CY ready input is not given for 10 s during the polygon motor is ON.
• Causes: Defective connector cable or poor contact in the connector. Defective polygon motor CY. Defective engine PWB.
• Remedy: Defective connector cable or poor contact in the connector. Reinsert the connector. Also check for continuity within the connector cable. If none, replace the cable. Laser scanner unit CY and engine PWB (YC31)
  Defective polygon motor CY. Replace the laser scanner unit CY.
  Defective engine PWB. Replace the engine PWB and check for correct operation.

• Code: 4201
• Description: Laser output error (black)
  The pin photo signal is not output from PD PWB K for one second while laser is emitted.
• Causes: Defective connector cable or poor contact in the connector. Defective APC PWB K. Defective PD PWB K. Defective engine PWB.
• Remedy: Defective connector cable or poor contact in the connector. Reinsert the connector. Also check for continuity within the connector cable. If none, replace the cable. APC PWB K and engine PWB (YC31)
  Defective APC PWB K. Replace the laser scanner unit KM.
  Defective PD PWB K. Replace the laser scanner unit KM.
  Defective engine PWB. Replace the engine PWB and check for correct operation.

• Code: 4202
• Description: Laser output error (cyan)
  The pin photo signal is not output from PD PWB C for one second while laser is emitted.
• Causes: Defective connector cable or poor contact in the connector. Defective APC PWB C. Defective PD PWB C. Defective engine PWB.
• Remedy: Defective connector cable or poor contact in the connector. Reinsert the connector. Also check for continuity within the connector cable. If none, replace the cable. APC PWB C and engine PWB (YC32)
  Defective APC PWB C. Replace the laser scanner unit CY.
  Defective PD PWB C. Replace the laser scanner unit CY.
  Defective engine PWB. Replace the engine PWB.

• Code: 4203
• Description: Laser output error (magenta)
  The pin photo signal is not output from PD PWB M for one second while laser is emitted.
• Causes: Defective connector cable or poor contact in the connector. Defective APC PWB M. Defective PD PWB M. Defective engine PWB.
• Remedy: Defective connector cable or poor contact in the connector. Reinsert the connector. Also check for continuity within the connector cable. If none, replace the cable. APC PWB M and engine PWB (YC31)
  Defective APC PWB M. Replace the laser scanner unit KM.
  Defective PD PWB M. Replace the laser scanner unit KM.
  Defective engine PWB. Replace the engine PWB.

• Code: 4204
• Description: Laser output error (yellow)
  The pin photo signal is not output from PD PWB Y for one second while laser is emitted.
• Causes: Defective connector cable or poor contact in the connector. Defective APC PWB Y. Defective PD PWB Y. Defective engine PWB.
• Remedy: Defective connector cable or poor contact in the connector. Reinsert the connector. Also check for continuity within the connector cable. If none, replace the cable. APC PWB Y and engine PWB (YC32)
  Defective APC PWB Y. Replace the laser scanner unit CY.
  Defective PD PWB Y. Replace the laser scanner unit CY.
  Defective engine PWB. Replace the engine PWB.

• Code: 4600
• Description: LSU cleaning motor error
  When the LSU cleaning motor is driven, the motor over-current detection signal is detected continuously for 50 times (5 s) at 100 ms intervals.
• Causes: Defective connector cable or poor contact in the connector. Defective drive transmission system of the LSU cleaning motor. Defective LSU cleaning motor. Defective engine PWB.
• Remedy: Defective connector cable or poor contact in the connector. Reinsert the connector. Also check for continuity within the connector cable. If none, replace the cable. LSU cleaning motor and engine PWB (YC36)
  Defective drive transmission system of the LSU cleaning motor. Check if the rollers and gears rotate smoothly. If not, grease the bushes and gears. Check for broken gears and replace if any.
  Defective LSU cleaning motor. Replace the LSU cleaning motor.
  Defective engine PWB. Replace the engine PWB and check for correct operation.

• Code: 4700
• Description: VIDEO ASIC device error
• Causes: Defective connector cable or poor contact in the connector. Defective main PWB or engine PWB.
• Remedy: Defective connector cable or poor contact in the connector. Reinsert the connector. Also check for continuity within the connector cable. If none, replace the cable. Main PWB (YC39) and relay PWB (YC3) Relay PWB (YC2, 4) and engine PWB (YC8, 9)
  Defective main PWB or engine PWB. Replace the main PWB or the engine PWB and check for correct operation.

• Code: 5301
• Description: Broken cleaning lamp K wire
  When the cleaning lamp K is driven, the lamp over-current detection signal is detected continuously for 10 times (1 s) at 100 ms intervals.
• Causes: Defective connector cable or poor contact in the connector. Defective cleaning lamp K. Defective engine PWB.
• Remedy: Defective connector cable or poor contact in the connector. Reinsert the connector. Also check for continuity within the connector cable. If none, replace the cable. Drum unit K and Drum relay PWB (YC2) Drum relay PWB (YC1) and engine PWB (YC34)
  Defective cleaning lamp K. Replace the drum unit K..
  Defective engine PWB. Replace the engine PWB and check for correct operation.