Canon Satera LBP5610 User Manual page 70

When loading envelopes at size of Envelope B5 (in case of LBP5610), close the
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flaps and load them so that the bottom of the envelopes is toward the front of the
printer when viewed from the front.
7
Align the paper guides with both sides of the stack.
IMPORTANT
Be sure to align the paper guides with the width of the envelopes. If the paper
guides are too loose or too tight, this may result in misfeeds or paper jams.
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