Laser printer missing colors?

If you have laser printer and the black and white is not printing well where it’s grainy or parts of it are missing then I have an easy fix. What you need to do is take out the cartridge and shake it. These will redistribute the powder inside of the laser cartridge and allow you to print. However, this does mean you are running low on toner and it is time to purchase another toner cartridge to have on standby.