Please do the following steps in refilling HP 339 Black Ink Cartridge.
Please do the following steps in refilling HP 339 Black Ink Cartridge.
Please do the following steps in refilling HP 338 Black Ink Cartridge.
Please do the following steps in refilling HP 337 Black Ink Cartridge.
Please do the following steps in refilling HP 21 Black Ink Cartridge.
HP 336 is a sponged black ink cartridge and therefore, it has to be refilled with a needle from the holes located on the top and under vacuum in a vacuum chamber.