Lexmark 4I3 - Manual (Page 241)

P a p e r P re s e n t
S e n s o r
To clean this sensor:
1. Turn the power Off (O).
2. Remove the ribbon.
3. Hold the sensor in place by pushing it down with a finger.
4. Clean the front surface, opposite the wires and closest to the
paper, with a cotton swab or a piece of cloth.
5. Replace the ribbon.
6. Turn the power On (|).
If this does not correct the false reading, call for service.
Appendix B. Problems B-11