Canon i-SENSYS MF6140dn User Manual page 200

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Automatic 2-sided printing is available for up to 128 g/m² of heavy papers.
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To use pre-printed paper, set the paper type to [Plain Paper L] if it is curled. Note that toner may not flow well into
the paper.
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Use only the types designed for laser printers.
To prevent paper jams, do not use the following paper types.
Wrinkled or creased paper
Curled or rolled paper
Torn paper
Damp paper
Very thin paper
Paper printed by a thermal transfer printer (Do not copy on the reverse side.)
The following paper types do not print well:
Highly textured paper
Very smooth paper
Glossy paper
Make sure that the paper is free of dust, lint, and oil stains.
Make sure to test print before purchasing large quantities of copy paper.
Keep the paper wrapped in its original package (unopened or opened) and stored in a cool, dry place
until ready to use. Make sure to keep it on a flat surface.
Store paper stacks in a place where temperatures are somewhere between 18 to 24°C and humidity
is somewhere between 40 % to 60 % RH.
Avoid rubbing the printed paper with fingers or cloth because it may cause toner stain or toner
peeling.
To print on damp paper
The following problems may occur.
Steam is emitted from the machine's output area.
Water droplets form on the back side of the operation panel and in the output area.
Moisture evaporates from damp paper due to the heat generated inside the fixing unit (it is most likely to occur at low
room temperatures). This is not a malfunction, but you can prevent this by using a stack of new unopened paper.
Should you smell something burning, immediately turn OFF the machine, unplug the power plug from the AC power
outlet, and contact your local authorized Canon dealer or the Canon help line. Continued use may lead to a fire or
electrical shock.
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