Does using a non-HP or refilled ink cartridge void the warranty on the HP OfficeJet Pro 7720?
Using a non-HP or refilled cartridge does not void the warranty or any HP support contract with the customer. However, if printer failure or damage is attributable to the use of a non-HP, refilled, or expired ink cartridge, HP will charge its standard time and materials charges to service the printer for that particular failure or damage. (Page 3)
From the official HP Officejet Pro 7720 Wide Format All-in-One Printer manual, page 3
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