Canon BJC-4400 - Manual (Page 31)

Paper Handling
Chapter 3 Paper Handling 3-5
Setting the Paper Thickness Lever
To ensure trouble-free paper handling, you’ll want to set the paper
thickness lever before loading paper.
❍ Center for the BC-21e Color BJ Cartridge
❍ Left for the BC-20 Black BJ Cartridge
❍ Right for heavier-weight print media or envelopes
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Be sure to check this lever when you change BJ cartridges, and before
and after printing on heavier-weight print media or envelopes.
PAPER THICKNESS LEVER