Can I use non-HP cartridges in my printer without voiding the warranty?
For HP printer products, the use of a non-HP cartridge or a refilled cartridge does not affect either the warranty to the customer or any HP support contract. However, if printer failure or damage is attributable to the use of a non-HP or refilled cartridge or an expired ink cartridge, HP will charge its standard time and materials charges to service the printer.
From the official HP Officejet Pro 7740 Wide Format All-in-One Printer manual, page 3
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