When the ink level is below the lower line on an ink
tank, you need to refill it.
Before checking the ink levels or refilling an ink
tank as described here, be sure to read the ink safety
precautions.
Caution:
If the ink level is below the lower line
on the ink tank, fill it to the upper line on the ink tank.
Continued use of the product when the ink level is below the lower
line on a tank could damage the product.