Canon imageCLASS MF3110 Basic Manual page 106

Copies are too dark or too light.
Q
A
Q
A
The printouts are partly missing or shaded when you make copies on heavy paper.
Q
A
The printouts are missing when you make copies on rough paper.
Q
A
The printouts are missing when you make copies using the 2 on 1 copy function.
Q
9
A
The edges of copies are dirty when you make copies.
Q
A
9-16 Print Quality Problems
Is the exposure adjusted correctly?
Adjust the exposure correctly using [Exposure]. (See "Adjusting the Exposure
(Density)," on p. 5-6.)
Is the machine in the toner saver mode?
Set <TONER SAVER MODE> to <OFF> in <COMMON SETTINGS> of the
Menu. (See <2. TONER SAVER MODE> of "Menu Descriptions," on p. 10-2.)
Is the paper type set correctly?
Select <HEAVY PAPER> or <HEAVY PAPER H> in <PAPER TYPE> in
<PAPER SETTINGS> of the Menu. (See "Specifying the Paper Type," on p.
2-12.)
Is the paper type set correctly?
Select <TRANSPARENCY> in <PAPER TYPE> in <PAPER SETTINGS> of the
Menu. (See "Specifying the Paper Type," on p. 2-12.)
Are the documents LTR-size or A4-size?
Be sure to use two sheets of LTR-size or A4-size documents when you make
copies using the 2 on 1 copy function.
Is the paper size set correctly?
Specify the appropriate paper size in <PAPER SIZE> in <PAPER SETTINGS>
of the Menu. (See "Specifying the Paper Size," on p. 2-11.)