* Lift the access door on your printer.
* You need to wait until the ink cartridges get to the replacement position.
* Now remove the cartridges from the printhead unit.
* Look for a latch at the side of the printhead and lift it.
* Remove the printhead assembly from the carriage.
* Now clean the assembly using distilled water.
* Also, check if the black cartridges are installed properly.
* Inspect it for any leaks.