After the machinery and circuit are all correct, check the water circuit. The excess oil will flow to the print head and cause damage.ĥ. You can use a paper towel to stick some lubricating oil to wipe it. The steel shaft should also be clean and smooth. When connecting the plug cable, do not have ink on it, and make sure that it is in good contact with the socket.Ĥ.
#HP OFFICEJET PRO 8720 PRINTHEAD INSTALL#
Be careful when installing the print head, be sure to cut off the power first, and install it in place.ģ. Secondly, the print heads sold in our shop have been strictly tested and filled with protective liquid.If you use a needle to inject water into the print head, it will not only wash away the protective liquid in the head, but also easily cause air blockage in the print head, resulting in no ink.Ģ. The main board will be burned out, and the print head will be burnt out. After receiving the print head, if you use a needle tube to inject water to check the nozzle or see if it is blocked, this is a very redundant and dangerous behavior.If the printing effect is not clear, press the machine cleaning button (the pFirst of all, once the print head enters the water, if the water is not dry, it is powered on. If you clean the print head with the cleaning fluid(or water) and do not drop the protective fluid, the print head will be completely blocked, and it will be useless.īefore you install this product, you need to pay attention to:ġ. You don't need to clean the print head with cleaning fluid, you can clean the print head directly on the machine. If the printing effect is not clear, press the machine cleaning button to clean (the print head must be cleaned only when the ink cartridge is sufficient, or it will burn out easily).Ĥ. Print a few more sheets of paper and wait for the excess protection fluid to run out, then you can print normallyģ. If there is no protective liquid, the print head cannot print because the pipeline channel is dry.If the print head can be detected, but the colors are uneven or blurred, you can continue printing with ink.
During the regeneration process of the print head, the ink will be cleaned and the protection liquid will be injected.
Before using it for the first time, wipe the print head before installing it.Just wipe the copper sheet gently, wipe it clean with soft paper, don't wipe it with cleaning fluid or eraser.Ģ. When the print head is shipped, a protective liquid will be applied to the print head. The printer must be disconnected from the power source before the print head is installed, otherwise it has the risk of causing the print head circuit board to burn out.ġ. Before you buy this product, you need to pay attention to:
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