Preparations to Refill NON-OEM 564, 564XL, 920, 920XL, 902, 902 XL ink Cartridges-Perform printer nozzle checks before opening your refillable cartridge to ensure your printer is in good working order. Please submit a copy of the nozzle check to your purchase receipt if your printer achieved a faultless result, since this will validate your warranty. Now you can begin installing your refilled cartridge. https://print-scansolutions.com/how-to-refill-ink-cartridge/