What does it mean when the Status LED is red on the SCX-3200?

A solid red Status LED indicates one of several issues: the inner cover is open, there is no paper in the tray, the machine has stopped due to a major error, or a toner cartridge has almost reached its estimated cartridge life. If the red LED is blinking, a small amount of toner is left in the cartridge and you should prepare a new cartridge for replacement. You may temporarily increase print quality by redistributing the toner. (Page 27)