Before you begin a large print job, you should check your ink levels as described below. If one of your cartridges is low, you can replace it before you start. Or you can wait until the ink runs out, replace the cartridge, and resume printing without any loss of print quality.
Partially used cartridges can be saved for up to six months and reused for running smaller print jobs. It’s a good idea to store them in individual, resealable plastic bags in case of ink leakage.
Checking Ink Levels
When one of the Ink Out lights is flashing (and INK LOW is displayed on the control panel), the corresponding cartridge is almost out of ink. Make sure you have a replacement cartridge.
Ink Out lights 
When the light stays on and INK OUT is displayed, the cartridge is empty. You must replace it before you can continue printing.