Will using a compatible toner cartridge void my warranty?
It is illegal for your laser printer/copier manufacturer to require you to use or purchase a particular brand of cartridge, just as it is illegal for your car dealer to require only original parts to be used to fix your car.
Hewlett Packard clearly states in their warranty policy that “Hewlett Packard does not prohibit the use of refilled toner cartridges during the warranty period or under a maintenance contract…” (American Office Dealer, “Better the Second Time Around!” March 1990). Should a service person or OEM representative try to tell you your warranty will be voided, simply ask him/her that you would like them to state that in writing on their company letterhead and to be sure to sign and date the letter. You are protected under the Magnusson-Moss Warranty Federal Trade Commission Improvement Act, Subparagraph C, Section 101. It is very unlikely that you will get the written statement you request.