• Code: 4101
• Description: BD initialization problem (K)
  BD is not detected within one second after the polygon motor stabilizes.
• Causes: Defective connector cable or poor contact in the connector.
  Defective APCPWB.
  Defective BDPWB.
  Defective Main 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. BDPWB and APCPWB APCPWB and LSU connect PWB (YC1) LSU connect PWB and engine PWB (YC12)
  Defective BDPWB. Defective APCPWB. Replace the Laser scanner unit (K).
  Defective Main PWB. Replace the main PWB and check for correct operation.

• Code: 4102
• Description: BD initialization problem (C)
  BD is not detected within one second after the polygon motor stabilizes.
• Causes: Defective connector cable or poor contact in the connector.
  Defective APCPWB.
  Defective BDPWB.
  Defective Main 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. BDPWB and APCPWB APCPWB and LSU connect PWB (YC2) LSU connect PWB and engine PWB (YC12)
  Defective BDPWB. Defective APCPWB. Replace the Laser scanner unit (C).
  Defective Main PWB. Replace the main PWB and check for correct operation.

• Code: 4103
• Description: BD initialization problem (M)
  BD is not detected within one second after the polygon motor stabilizes.
• Causes: Defective connector cable or poor contact in the connector.
  Defective APCPWB.
  Defective BDPWB.
  Defective Main 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. BDPWB and APCPWB APCPWB and LSU connect PWB (YC3) LSU connect PWB and engine PWB (YC12)
  Defective BDPWB. Defective APCPWB. Replace the Laser scanner unit (M).
  Defective Main PWB. Replace the main PWB and check for correct operation.

• Code: 4104
• Description: BD initialization problem (Y)
  BD is not detected within one second after the polygon motor stabilizes.
• Causes: Defective connector cable or poor contact in the connector.
  Defective APCPWB.
  Defective BDPWB.
  Defective Main 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. BDPWB and APCPWB APCPWB and LSU connect PWB (YC4) LSU connect PWB and engine PWB (YC12)
  Defective BDPWB. Defective APCPWB. Replace the Laser scanner unit (M).
  Defective Main PWB. Replace the main PWB and check for correct operation.

• Code: 4600
• Description: LSU cleaning motor error
  When the LSU cleaning motor is driven, an error signal is detected continuously for 1 s.
• Causes: Defective connector cable or poor contact in the connector.
  Defective drive transmission system.
  Defective motor. Defective PWB.
• Remedy: Defective connector cable or poor contact in the connector. Reinsert the connector. Also check for continuity of the connector cable. If none, replace the cable. LSU cleaning motor and LSU connect PWB(YC11) LSU connect PWB and engine PWB(YC12)
  Defective drive transmission system. Check if the rollers and gears rotate smoothly. If not, grease the bushings and gears. Check for broken gears and replace if any.
  Defective motor. Replace the LSU cleaning motor.
  Defective PWB. Replace the engine PWB or LSU connect PWB check for correct operation.

• Code: 4700
• Description: VIDEO ASIC device error
  Mismatch of reading data from two locations occurs eight times successively. Mismatch between writing data and reading data occurs eight times successively.
• 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 (YC105) and engine PWB (YC17)
  Defective main PWB or engine PWB. Replace the main PWB or the engine PWB and check for correct operation.

• Code: 4950
• Description: LSU CPU communication error
  A communication error is detected 10 times in succession.
• Causes: Defective connector cable or poor contact in the connector.
  Defective 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 and engine PWB (YC26)
  Defective PWB. Replace the main PWB or engine PWB and check for correct operation.

• Code: 6000
• Description: Broken fuser heater wire
  Fuser thermistor 2 does not reach 100° C/212 °F even after20 s during warming up. The detected temperature of fuser thermistor2 does not reach the specified temperature (ready indication temperature) for 20 s in warming up after reached to 100° C/ 212 °F.
• Causes: Defective connector cable or poor contact in the connector.
  Deformed connector pin.
  Defective IH PWB.
  Fuser thermostat triggered.
  Broken fuser heater wire.
  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. IH coil unit and IHPWB IHPWB and engine PWB (YC7)
  Deformed connector pin. If the I/F connector pins of the fuser unit and the main unit are deformed owing to foreign matters, such as paper dusts, replace the connectors or the units including the connectors.
  Defective IH PWB. Replace the IH PWB and check for correct operation.
  Broken fuser heater wire. Fuser thermostat triggered. Reinsert the fuser unit.
  Defective engine PWB. Replace the engine PWB and check for correct operation.