Canon LBP7210Cdn Manual page 468

The drum in any of the toner cartridges has deteriorated.
Cause 4
Solution Replace the toner cartridge with a new one.
"Replacing Toner Cartridges"
Cause 5 Depending on the paper type or the operating environment (high humidity or high
temperature environment), residual images may appear on non-printed areas.
Solution 1 Perform the following procedure in the printer driver.
1. Display the [Paper Source] sheet.
2. Set [Paper Type] as follows.
If you perform the above procedure, the toner does not fix onto paper well, and
the print may come out faint.
Solution 2 Perform the following procedure in the printer driver.
1. Display the [Finishing] sheet.
2. Click [Advanced Settings].
3. Set [Special Print Mode] to [Special Settings 5].
Normally, use the printer with [Special Print Mode] set to [Off]. Specify [Special Settings
5] only if the described problems occur.
Printing Is Uneven
Paper is too moist or too dry.
Cause 1
Solution Replace the paper with new paper in an unopened package.
"Loading Standard Size Paper (Other Than Index Cards and Envelopes)"
"Loading Index Cards"
"Loading Envelopes"
Current Setting Changed Setting
[Plain Paper L] [Plain Paper L2]
[Plain Paper] [Plain Paper L]
[Heavy Paper 1] [Plain Paper]
[Heavy Paper 2] [Heavy Paper 1]
[Heavy Paper 3] [Heavy Paper 2]
[Envelope H] [Envelope]
[Coated Paper 2] [Coated Paper 1]
[Coated Paper 3] [Coated Paper 2]
[Coated Paper 4] [Coated Paper 3]
IMPORTANT
When [Special Settings 5] is selected
The printing speed drops.