Canon BJC-620 - Manual (Page 31)

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To ensure trouble-free paper handling, you'll want to set the paper thickness lever and the
paper selection lever before loading paper.
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You use the paper thickness lever to adjust the distance between the print head and the
paper to accommodate different paper thicknesses. This distance is called the print gap.
Set the lever according to the thickness of the paper you are using:
z Down is for printing on plain paper and normal weight (such as 20 lb) print media.
z Up is for printing on heavier-weight print media (such as fabric sheets) and envelopes
(See page 3-8 for details).
Paper Thickness Lever
Always set the paper thickness lever before and after printing on heavier-weight print media
or envelopes.
If you are printing documents with high density graphics or ink and the printed pages are
smudged, try setting the paper thickness lever to the up position. This moves the print head
unit further from the paper. Print quality may diminish slightly but the smudges should go
away.
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Chapter 3