Package Included: 1xBlack/Yellow, 1xCyan/Magenta (2PCS, BY / MC)， C4900A / C4901A, 2 pcs 100% compatible with the following printers: . HP Officejet Pro: 8000 - A809a , 8000 Enterprise - A811a , 8000 Wireless - A809n / 8500A Plus - A910g , 8500A Premium - A910n 1. My printer reports "The following print head has a problem" or any error message, how do we process the next step? LKB Answer: Just skip the message, and press "OK" or "Continue" and go on printing. 2. My printer did not recognize the print head, how do we do? LKB Answer: ① please take off print heads, use eraser to clean the chips softly and use tissue paper to clean the metal touch pot softly(can't finger touch), and then re-install the print head; Or ②You can use a knife to tear off the remanufactured print head chip, and then use the double-side tape to paste the original chip. 3. My printer hasn't printed for a long time, now the printer report shows that the print head has a problem, how do we do? LKB Answer: ① Your printer at least needs to print 1~2 pages twice a week. ② Because haven't printed for a long time, the ink in the print head is a little dry, soak the print head nozzle into hot water with around 75°degree almost 2 hours or half day, and then use tissue paper to touch the nozzle and absorb the ink. Note: 1. Our print head is remanufactured, not original one, Non OEM value-save more for you; 2. Please shake the print head before installation, it will avoid bubble problem. 3. When you replace the print head, please do Printer Head Cleaning 2~3 times every time.
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