If the head cover doesn't open when you replace an ink cartridge, follow these steps to resolve the issue:
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Turn the printer OFF.
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Push against the left side of the cartridge holder until it hits the right inner side of the printer.
Be careful not touch the other parts inside the printer.
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When the head cover opens, move the cartridge holder until you can see the cartridge lock lever.
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Remove the protective tape and the white fixing material attached to the cartridge holder to confirm that the holder is positioned as shown in the image below (on the right).
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Close the head cover, turn the printer ON, then make sure the head cover opens automatically.