Epson EPL-1220 Reference Manual page 27

4. Slide the side paper guides outward to accommodate the
paper you are loading.
Note:
To load A3, B4, LGL, or F4-size paper, unlock the cassette lock and
expand the MP tray to the end, then lock the tray lock again.
LOCK
UNLOCK
Chapter 2 Paper Handling
Unlock the lever of the
side paper guides.
Lock the lever of the side
paper guides.
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