Hi tom63jan,
Blurry printing from your PIXMA TR4720 can be caused when the encoder/timing strip is dirty or smudged.
To clean the encoder/timing strip, please follow the steps outlined in the following Knowledgebase Article available from Canon's web site:
Cleaning the Encoder Film - TR4720
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 TR4720 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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