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7.Carefully lower the latch handle.
NOTE: Make sure you lower the latch handle before reinserting the ink cartridges. Leaving the latch handle raised can result in incorrectly seated ink cartridges and problems printing. The latch must remain down in order to correctly install the ink cartridges.
8.Using the colored shaped icons for help, slide the ink cartridge into the empty slot until it clicks into place and is seated firmly in the slot.
9.Close the ink cartridge door.
Cause: The printhead or ink cartridges were not installed or incorrectly installed.
Errors 121