The ink-jet printer has a high scientific and technological content, and its parts are very precise. The correct use and operation of the printer plays an important role in reducing the probability of printer failure and extending its service life.

There are two main technologies used for ink-jet printers: continuous ink-jet technology and random ink-jet technology. The early ink-jet printers and the current large format ink-jet printers all use continuous ink-jet technology, while the current popular ink-jet printers generally use random ink-jet technology. Continuous ink-jet technology is represented by charge modulation. In random ink-jet system, ink is sprayed only when printing is required, so it is also called on-demand.