Canon MF229dw User Manual page 359

Copy
Off
On
Print
Off
On
<Menu>
<Print>
After the setting is enabled
When set to <On>, this setting takes priority over the setting for <Special Mode Z>.
While more effect is gained than with <Special Mode Z>, print speed is slower.
After printing from a smartphone or tablet
If streaks adhere to the paper, change the setting with <Special Mode D>
Special Mode I
Only select <On> if paper jams frequently when performing 2-sided printing on lightweight paper or on curled paper.
Off
On
<Menu>
When set to <On>
White patches may appear in images printed on paper other than lightweight paper.
Special Mode J
If printing is uneven when printing fine lines or faint images, select <On>.
Off
On
<Menu>
When set to <On>.
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<Adjustment/Maintenance>
<On>
<Adjustment/Maintenance>
<Adjustment/Maintenance>
<Special Processing> <Special Mode D>
<Copy>.
<Special Processing> <Special Mode I>
<Special Processing> <Special Mode J>
Select <Copy> or
<On>
<On>