Canon imagePROGRAF TA-20 MFP 24" Large Format Printer with L24ei Scanner and Stand Kit - Manual (Page 722)

Check 7 Low Print Quality setting causing lines in the printing
Follow the steps below to set Print Quality to High , and then print.
• Windows
Change the Print Quality settings in the printer driver Advanced Settings .
Changing the Print Quality and Correcting Image Data (Windows)
• macOS
Change the Print Quality in the printer driver Quality & Media settings.
Changing the Print Quality and Correcting Image Data (macOS)
If a setting higher than Standard is selected, the printing time is longer and more ink is used.
Check 8 Is the media type specified in the printer driver the same as the media type
loaded in the printer?
Load paper of the same type as you have specified in the printer driver.
Loading Rolls in the Printer
Loading Sheets in the Printer
Follow the steps below to change the printer driver settings.
1. To stop printing, press the Stop button.
2. Change the type of paper in the printer driver and try printing again.
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