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When you refill an HP color laser cartridge you need to replace the SmartChip, as I do not believe that there is any way to reset the chip. Any reputable seller of toner would include the chip with the toner order. The are for sale on Ebay
If the toner cartridges are "refills" that might explain some of your print quality issues. Unfortunately, HP only has 2 replacement parts for that model, the fuser and the ETB (Transfer belt) both would require a technician to replace. Check the transfer belt of any tears or punctures. Careful not to touch it, oils from your skin can cause quality issues as well. If at all possible replace all the toners with ones that were working fine.