Canon i-SENSYS MF6140dn User Manual page 863

Set a lower image quality. The transmission time can be shortened by setting the resolution to <200 x 100 dpi (Normal)>.
"Changing the Scan Settings (Fax)"
Errors occur frequently during sending.
Make sure that the telephone line is not receiving interference from nearby devices such as a microwave oven.
Sent faxes print poorly at the receiving fax machine (spotting, size reductions, or contrast
problems).
When a fax printed out by the receiving fax machine has spots
Make a copy on a blank sheet and check to see if there are any spots on the platen glass or feeder's scanning
area. Clean the platen glass or feeder's scanning area to remove the spots if necessary. If the sheet has no spots,
the receiving fax machine may be the cause of dirty prints.
"Cleaning the Platen Glass"
"Cleaning the Feeder Automatically "
"Cleaning the Feeder "
Make sure that the document is properly placed.
"Placing Documents"
When a fax printed out by the receiving fax machine is smaller than its actual size
Make sure that the appropriate paper size is loaded in the receiving fax machine's paper tray.
When the contrast of the printed fax is too light or too dark
Adjust the density setting.
"Changing the Scan Settings (Fax)"
Make sure that the platen glass or feeder's scanning area is clean.
"Cleaning the Platen Glass"
"Cleaning the Feeder Automatically "
"Cleaning the Feeder "
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