Canon FAX-L160 Reference Manual page 130

Print quality is poor.
Q Is the toner low or unevenly distributed?
A Redistribute the toner inside the toner cartridge. If
the problem persists, replace the toner cartridge. (See
"Replacing the Toner Cartridge, " on p. 7-8.)
Q Is the correct type of paper loaded in the machine?
A Make sure you load paper that meets the requirements for
use. (See "Paper Requirements, " on p. 2-5.)
Q Is the sender's machine functioning properly?
A Ask the sender to check that the scanning components of
the machine are clean.
Q Is the machine in the toner saver mode?
A Set <TONER SAVER MODE> to <OFF>. (See "COMMON
SETTINGS, " on p. 9-6.)
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Faxes do not print.
Q Have you removed the plastic seal from the toner
cartridge?
A Make sure you remove the seal from the toner cartridge.
(See "Set Up the Machine, " in the Starter Guide.)
Q Is the toner cartridge installed properly?
A Make sure the toner cartridge is installed properly. (See
"Set Up the Machine, " in the Starter Guide.)
Q Is the cartridge out of toner?
A Replace the toner cartridge. (See "Replacing the Toner
Cartridge, " on p. 7-8.)
Q Is the correct size of paper loaded in the machine?
A Make sure you load paper that meets the requirements for
use. (See "Paper Requirements, " on p. 2-5.)
A Change <PAPER SETTINGS>. (See "Setting Paper Size and
Type, " on p. 2-10.)
Received faxes print blotched or unevenly.
Q Is the sender's machine functioning properly?
A Ask the sender to check that the scanning components of
the machine are clean.