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Make sure that the black ink cartridge has enough ink. Low ink levels can affect the printing quality. Print a test page to determine if the issue is specific to black color. Most printers have a self-test or diagnostic page that you can print from the printer's control panel. Many printers have a built-in tool for cleaning the print head. To know more about hp printer not printing black color both sides. Refer to your printer's manual for instructions on how to run the print head cleaning utility. If the print head is clogged, you may need to manually clean it. Some printers have a manual cleaning option in the maintenance menu. Follow your printer's manual for guidance. Print head misalignment can cause printing issues. Check your printer's manual for instructions on how to align the print head. Ensure that you have the latest drivers for your printer installed on your computer. Visit the HP website to download and install the latest drivers if needed.