Hi jeeryulysses,
Your PIXMA TS7720 is still in warranty. 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 TS7720 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. A Technical Support Representative can determine the cause of the 6000 error and resolve it or provide you with your available service options.
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