Canon LBP-5100 User Manual page 125

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3-46 Loading Envelopes in the Paper Source
Set the paper cassette in the printer.
Push the paper cassette into the printer firmly until the front side of the paper
cassette is flush with the front surface of the printer.
CAUTION
When setting the paper cassette in the printer, be careful not to catch your
fingers.
Register the size of the loaded paper using the following
procedure.
This printer's paper cassette cannot automatically detect the paper size.
Therefore, you need to register the size of the loaded paper in the Printer Status
Window.