HP's Deskjet 940C printer offers photo-quality images due to the colouring layering technology used in printing. According to the HP website, the HP 940C printer is compatible with Windows editions from Windows 95 through Windows XP and Mac computers that have USB ports. If you have an HP Deskjet 940C printer, you can tell when the ink cartridge inside the unit gets empty in a variety of ways.
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- Moderately Easy
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Pay attention to the built-in ink-level monitor on the HP 940C printer. The ink-level monitor appears on the display panel of the printer and shows an estimate of how much ink is left in the ink cartridge. The ink-level monitor flashes once it reaches a level below 10%, indicating that the printer is nearly empty.
Wait until lines appear on the pages printed with the HP 940C printer if you think that the ink-level monitor is off. White lines or streaks or text that appears light or faded on a printout often indicate that the printer is low on ink. The indicator on the ink-level monitor points to the colour of ink that is low, which allows you to change only the low or empty cartridge.
Hold the ink cartridge close to your ear and tilt the ink cartridge back and forth. If the ink cartridge has quite a lot of ink left in it, you can usually hear the ink move inside of it. Do not shake the HP 940C ink cartridge, though. Shaking an inkjet cartridge, such as those used in the HP 940C printer, can cause air bubbles in the ink which cause the printer not to work.
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