Replacing the ink cartridges in an HP Deskjet 3755 is simple. First, ensure the printer is powered on. Once the carriage has moved to the middle, open the access door for the ink cartridge. To remove the old cartridge, press down on it and then pull it out. Unpack the new cartridge, removing any protective tape. Insert the new cartridge into the correct slot (black on the right, color on the left), pushing it until it clicks into place. The printer will automatically align the ink cartridges when the access door to the cartridges is closed. It's now time to use your HP Deskjet 3755.

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