Lexmark 4I3 - Manual (Page 83)

4. Feed the form into the printer until the paper is on at least two
tractor pins on each side. Be sure that the form goes under the
blue forms guide/forms sensor.
B lu e F o rm s G u id e /
F o r m s S e n s o r
5. Put the left paper holes over the left tractor pins. Close the left
blue tractor door.
B lu e Tr a c t o r D o o r
Chapter 1. Setting Up the 4230 Printer 1-61