Lexmark 4I3 - Manual (Page 113)

Changing the Paper Door
The printer must have a different paper door installed to be used with
the F3 forms device. If you have ordered the F3 forms device, your
shipment includes an F3 forms device paper door.
To change paper doors, follow these steps:
1. Open the standard paper door to the position shown. Press the
two tabs to release the door and slowly pull the door toward you.
Remove the standard paper door.
Ta b
S lo t
P a p e r D o o r
H i n g e
P in s
Chapter 1. Setting Up the 4230 Printer 1-91