[Ham-Computers] Lines on Laser Printer Output?

[Ron Youvan]

> We had been seeing some lines on the output of our Samsung 
> ML-2251NP
> laser printer for a while, even after we replaced the 
> original toner cartridge with a new one.

> Does this suggest that the drum or something is bad?

   You don't mention whether they are black or white lines.
I don't know the printer so all I can say is:
Generally white lines are from particles (of toner or paper
bits) on some window the laser or LED light goes through
on it's way to the drum, or scratches on the drum.
Black lines are from a dirty drum or other roller, or particle
buildup on a charging wire relating to charging the drum
or discharging the drum's surface.
-- 
    Ron  KA4INM - I'm proud to be Chuck's pop!