An "ink system" refers to one color, and the component parts that are included in the ink system:
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The ink cartridge
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The print head
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The printhead cleaner.
All three components of an ink system must be used together. Each of the three components are designed to be used together as a single system, and information about their use is recorded within the ink system. Failure to use them together could result in poor image quality or a failure of a component at a critical point in printing.
If you transfer a print head from one printer to another, you should also transfer the printhead cleaner and the ink cartridge.
If you receive an "Out of ink" message and you find that the ink cartridge is empty, replace it and the associated print head and printhead cleaner. Replacing ink systems must always be done under the control of the Replace Ink Systems button or through specific front panel prompts. In particular, do not replace components while the printer is off or by opening the window or doors, other than as prompted.