Epson PRO L1490U User Manual page 46

2. When using one of the following lenses, attach the lens connector cap: ELPLS04, ELPLU02,
ELPLR04, ELPLW04, ELPLM06, ELPLM07, or ELPLL07.
3. Slide the lock lever to the Release position (as shown) until you hear it click.
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