Samsung SL-X7600GX Service Manual page 456

4. Troubleshooting
► Error Code
U3–3511 / U3–3513 / U3–3514
► Error message
Original paper jam inside of scanner.
► Symptom
Jam has occurred inside the DSDF unit.
► Troubleshooting method
1) Open the DSDF cover. If there is jammed paper, remove it.
2) If this error occurs continually, check the Regi. sensor and Regi actuator.
Push and release the regi actuator. Check if the pick up module returns the original position.
If the sensor is defective, replace it.
3) If the regi sensor is OK, check the scan 2 sensor and exit sensor.
• If the scan 2 sensor is defective, replace it.
• If the exit sensor is defective, replace it.
4-205 Copyright© 1995-2013 SAMSUNG. All rights reserved.