Canon BJC-620 - Manual (Page 33)

z When manually feeding any type of print media, set the paper
selection lever to the front position and lower the paper support.
z Do not move the paper selection lever after loading paper in the
sheet feeder.
z This lever is different than the lever on a typewriter or dot matrix
printer. You need not pull it forward to load paper. You set the
paper selection lever to the front position only when loading
envelopes or when manually feeding paper. If it is set to the front
position when you are automatically feeding stacks of normal
paper, the printer may feed multiple sheets or jam.
When the paper selection lever is in the back position, a lever inside the
printer prevents the paper from advancing into the printer. When you
move the paper selection lever to the front position, the lever inside the
printer moves so that the single sheet being manually fed can advance
into the printer.
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Chapter 3