• Code: 3700
• Description: Scanner device error
• Causes: CCD connector inserted incorrectly.
• Remedy: Reinsert the image scanner unit connector if necessary.

• Code: 3800
• Description: AFE error
  When writing the data, read and write data does not match 3 times in succession.
• Causes: Defective ISC PWB.
• Remedy: Replace the ISC PWB and check for correct operation.

• Code: 3900
• Description: Backup memory read/write error (ISC PWB)
  Read and write data does not match.
• Causes: Defective backup memory or PWB.
• Remedy: Replace the ISC PWB and check for correct operation.

• Code: 4001
• Description: Polygon motor K synchronization error
  After polygon motor K is driven, the ready signal does not turn to L within 30 s.
• Causes: Defective connector cable or poor contact in the connector.
  Defective polygon motor 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. Polygon motor K and LSU relay PWB (YC4) LSU relay PWB (YC4) and engine PWB (YC12)
  Defective polygon motor K. Replace the laser scanner unit.
  Defective engine PWB. Replace the engine PWB and check for correct operation.

• Code: 4002
• Description: Polygon motor C synchronization error
  After polygon motor C is driven, the ready signal does not turn to L within 30 s.
• Causes: Defective connector cable or poor contact in the connector.
  Defective polygon motor 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. Polygon motor C and LSU relay PWB (YC9) LSU relay PWB (YC3) and engine PWB (YC12)
  Defective polygon motor C. Replace the laser scanner unit.
  Defective engine PWB. Replace the engine PWB and check for correct operation.

• Code: 4003
• Description: Polygon motor M synchronization error
  After polygon motor M is driven, the ready signal does not turn to L within 30 s.
• Causes: Defective connector cable or poor contact in the connector.
  Defective polygon motor 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. Polygon motor M and LSU relay PWB (YC7) LSU relay PWB (YC3) and engine PWB (YC12)
  Defective polygon motor M. Replace the laser scanner unit.
  Defective engine PWB. Replace the engine PWB and check for correct operation.

• Code: 4004
• Description: Polygon motor Y synchronization error
  After polygon motor Y is driven, the ready signal does not turn to L within 30 s.
• Causes: Defective connector cable or poor contact in the connector.
  Defective polygon motor 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. Polygon motor Y and LSU relay PWB (YC11) LSU relay PWB (YC3) and engine PWB (YC12)
  Defective polygon motor Y. Replace the laser scanner unit.
  Defective engine PWB. Replace the engine PWB and check for correct operation.

• Code: 4011
• Description: Polygon motor K steady-state error
  After polygon motor K is stabilized, the ready signal is at the H level for 15 s continuously.
• Causes: Defective connector cable or poor contact in the connector.
  Defective polygon motor 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. Polygon motor K and LSU relay PWB (YC4) LSU relay PWB (YC4) and engine PWB (YC12)
  Defective polygon motor K. Replace the laser scanner unit.
  Defective engine PWB. Replace the engine PWB and check for correct operation.