crwdns2934241:0crwdne2934241:0 Med_tech

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https://support.hp.com/ca-en/document/c04289891

https://support.hp.com/us-en/product/hp-officejet-pro-8620-e-all-in-one-printer-series/5367611/model/5385111/document/c04100779

The companies want you to replace the whole printer. Try cleaning it using these guides (or a youtube video if more convenient), i hope they help and if not, i hope you are in warranty ;P

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open