Iam getting lines on my printer OKI 830DN , its happening on the cyan and yellow toners, I normally get this when toners are about to run out, but there is still a plenty of life cycle in the image drums, Its happened to me on a few occassions, and I kept putting it down to a faulty image drum every time, Ive cleaned the heads and any loose toner thats in the printer, any suggestions would be great.