Canon IMAGERUNNER 1610 Reference Manual page 118

Copies are dirty.
Cause 1
The platen glass or rear side of the ADF/platen glass cover may be dirty.
Remedy
Clean the platen glass or rear side of the ADF/platen glass cover. (See "Cleaning the
Read Area of the Platen Glass," on p. 5-15.)
Cause 2
The rollers inside the machine are dirty.
Remedy
Clean the rollers. (See "Cleaning the Rollers Inside the Main Unit," on p. 5-16.)
Cause 3
There may be a scratch on the drum unit.
Remedy
Replace the drum unit. (For details, contact your local authorized Canon dealer.)
Cause 4
Condensation has built up inside the machine.
Remedy
Allow at least two hours for the machine to adjust to room temperature before
attempting to use it.
Cause 5
The machine may be installed in a location where the floor or foundation is unstable.
Remedy
Install the machine in a proper location.
Black lines are on the copy.
Cause
The read area of the platen glass is dirty.
Remedy
Clean the read area of the platen glass. (See "Cleaning the Read Area of the Platen
Glass," on p. 5-15.)
Copies are too dark or too light.
Cause 1
The copy exposure may not be adjusted correctly.
Remedy
Adjust the copy exposure correctly using the <PRINT EXPOSURE> setting in
<COMMON SETTINGS> from the <ADDITIONAL FUNCTIONS> menu. (See
"Common Settings," on p. 4-4.)
Cause 2
<TONER SAVER MODE> may be set to <ON> in <COMMON SETTINGS> from the
<ADDITIONAL FUNCTIONS> menu.
Remedy
Set <TONER SAVER MODE> to <OFF>. (See "Common Settings," on p. 4-4.)
The copy images are partly missing or shaded when you make copies on thick paper.
Cause
The <BYPASS PAPERTYPE> or <COPY POWER LEVEL> settings in <COMMON
SETTINGS> (from the <ADDITIONAL FUNCTIONS> menu) may not be set correctly.
Remedy 1
Select <SPECIAL PAPER 1> in <BYPASS PAPERTYPE>. (See "Common Settings," on
p. 4-4.)
Remedy 2
Set <COPY POWER LEVEL> to <HIGH>. (See "Common Settings," on p. 4-4.)
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If Trouble Occurs
6