Canon PRO-100S series Online Manual page 113

4. Pull out the output tray extension (D).
5. Open the feed slot cover.
6. Slide the paper guides (E) to open them, and load the envelopes in the center of the rear
tray WITH THE ADDRESS SIDE FACING YOU.
The folded flap of the envelope will be faced down on the left side.
Up to 10 envelopes can be loaded at once.
7. Slide the paper guides (E) to align them with both sides of the envelopes.
Do not slide the paper guides too hard against the envelopes. The envelopes may not be fed properly.
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