Canon MF247dw User Manual page 535

After the setting is changed
By specifying <Off> or <Mode 1>, streaks may adhere to the print paper. By specifying <Mode 3> or <Mode 4>,
outlines may be blurred or images may appear somewhat grainy. The print density becomes lighter as the
setting progresses from <Off> to <Mode 4>.
After printing from a smartphone or tablet
If streaks adhere to the paper, change the setting with <Special Printing Mode Z>
Special Printing Mode B
Adjust this setting if streaks adhere to the print paper after replacing the toner cartridge or after not printing
for a long period of time.
Off
Mode 1
Mode 2
Mode 3
<Menu> <Adjustment/Maintenance>
Select the mode
After the setting is enabled
Print speed is slower.
Special Printing Mode C
Adjust this setting if streaks adhere to the print paper when printing out received faxes.
Off
On
Setting Menu List
<Special Processing>
527
<Copy>.
<Special Printing Mode B>