Kyocera TASKalfa 6003i Operation Manual page 154

Preparation before Use > Loading Paper
4
5
6
Attach the envelope feed guide as shown in the illustration.
The illustration below shows that the lever of the envelope feed guide is expanded.
Adjust the paper length guide to the paper size required.
Adjust the position of the paper width guides located on the
left and right sides of the cassette.
3-11