• Code: 3500
• Description: Communication error
  between scanner and ASIC An error code is detected.
• Causes: ISC PWB. Main PWB.
• Remedy: ISC PWB 1. Confirm that the wiring connector is firmly connected and, if necessary, connect the connector all the way in. ISC PWB (YC3) and Main PWB (YC11) 2. If the wiring is disconnected, shorted or grounded, replace the wiring. 3. Replace the ISC PWB and execute U411.
  Main PWB Replace the main PWB.

• Code: 3600
• Description: Scanner sequence error
• Causes: ISC PWB
• Remedy: 1. Execute U021 memory initializing. 2. Replace the ISC PWB and execute U411.

• Code: 3700
• Description: Scanner device error
• Causes: CCD (ISU)
• Remedy: Since the ISU is mounted with a CCD of different type, install the ISU that matches with the model.

• Code: 3800
• Description: AFE error
  When writing the data, read and write data does not match 3 times in succession. No response is received in 100 ms from AEF.
• Causes: ISC PWB. CCD PWB.
• Remedy: ISC PWB 1. Confirm that the FCC wiring connector is not distorted and connect the FCC wiring all the way in. CCD PWB (YC2) and ISC PWB (YC9) 2. If the FCC wiring is disconnected, replace the FCC wiring. 3. Replace the ISC PWB and execute U411.
  CCD PWB Replace the ISU and execute U411.

• Code: 3900
• Description: Backup memory read/write error (ISC PWB)
  Read and write data does not match.
• Causes: Backup memory (ISC PWB).
• Remedy: 1. Turn the main power switch off and after 5 seconds, turn it on. 2. Replace the ISC PWB and execute U411.

• Code: 4001
• Description: Polygon motor synchronization error
  After polygon motor is driven, the ready signal does not turn to L within 30 s. The polygon motor speed won’t stabilize within 10 s.
• Causes: Polygon motor (LSU). Engine PWB.
• Remedy: Polygon motor (LSU) 1. Confirm that the wiring connector is firmly connected and, if necessary, connect the connector all the way in. Polygon motor and Engine PWB (YC15) 2. If the wiring is disconnected, shorted or grounded, replace the wiring. 3. Replace the laser scanner unit.
  Engine PWB 1. Check the engine software and upgrade to the latest, if necessary. 2. Replace the engine PWB.

• Code: 4011
• Description: Polygon motor steady-state error
  After Polygon motor is stabilized, the ready signal is at the H level for 15 s continuously.
• Causes: Polygon motor (LSU). Engine PWB.
• Remedy: Polygon motor (LSU) 1. Confirm that the wiring connector is firmly connected and, if necessary, connect the connector all the way in. Polygon motor and Engine PWB (YC15) 2. If the wiring is disconnected, shorted or grounded, replace the wiring. 3. Replace the laser scanner unit.
  Engine PWB 1. Check the engine software and upgrade to the latest, if necessary. 2. Replace the engine PWB.

• Code: 4101
• Description: BD initialization error K
  After Polygon motor is driven, the BD signal is not detected for 1 s.
• Causes: PD PWB K (LSU). Engine PWB.
• Remedy: PD PWB K (LSU) 1. Confirm that the FCC wiring connector is not distorted and connect the FCC wiring all the way in. Laser scanner unit and LSU relay PWB (YC3) LSU relay PWB (YC2) and Engine PWB (YC11) 2. If the FCC wiring is disconnected, replace the FCC wiring. 3. Replace the laser scanner unit.
  Engine PWB 1. Check the engine software and upgrade to the latest, if necessary. 2. Replace the engine PWB.