Complex system having ink-jet printing function and testing function, and an ink-jet printing apparatus having the same

An ink-jet printing apparatus comprising:

• a plurality of ink-jet heads for feeding ink to form a plurality of patterns on a printing object;
• a gantry movable over the printing object where the plurality of ink-jet heads is mounted;
• at least one test device, being mounted on a back side of the gantry, for testing a status of the plurality of patterns formed on the printing object;
• an ink reserving device, being connected to the plurality of ink-jet heads, respectively, for reserving ink to be fed to the plurality of ink-jet heads;
• and
• a controller for controlling respective operations of the plurality of ink-jet heads, the gantry, and the at least one test device,
• wherein the plurality of ink-jet heads, the gantry, the at least one test device, and the controller form a complex system having an ink-jet printing function and a testing function.