Hi Rubyney,
Lines in images can be caused by an incorrect paper setting on your PIXMA TS6420a.
What is the size and type of paper that you are using?
Are you printing from the cassette (in the front) or the rear paper tray?
With the Home screen displayed on your printer, please press the OK button.
Use the down arrow to select Feed settings and press OK.
Using the arrows, select the source of your paper, either rear tray or cassette and press OK.
Does the paper currently selected match the paper that is loaded in that location?
If not, select Change and press OK.
Select your paper type and size.
Once set, please attempt to print again.
Please note, only plain paper can be loaded in the cassette. All other paper type must be loaded in the rear tray.
After setting that, please attempt to print from your computer.
If you continue to have difficulties, please contact one of Canon's Technical Support Representatives via phone or chat. To contact a Technical Support Representative, please use the link below to log into your My Canon account:
https://mycanon.usa.canon.com
Once logged in, click on your PIXMA TS6420a and then click on the Product Support button. When that page loads, click on either the Phone Support button or the Chat Support button to access support.
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