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Question: Why won't PDFs print correctly?

For some time now I have been unable to print PDF files to my Canon printer.

The printer will print photos without issue, but will not print from a PDF. Particularly if the PDF is a form or shipping label. If it does not print a blank page, then what does come out looks like this:

User uploaded file

The printer in question is a Canon Pixma MG6320 connected over wifi.

I have tried:

  • Using the "Print as image"option from Adobe Acrobat.
  • Cleaning the cartridges
  • Replacing the cartridges
  • Deleting and re-adding the printer
  • Resetting printer data from system preferences
  • Printing from Acrobat Pro, Preview, Photoshop. Same result.

Have yet to try manually flushing the print heads out (would prefer to avoid this).

Any ideas? I've wasted a lot of paper on this...

iMac, macOS Sierra (10.12), 27inch iMac mid 2010

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Question: Why won't PDFs print correctly?