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If the print is a dismal gray rather than a sharp black, you are
probably almost out of toner. This can manifest itself evenly across the
entire page or in splotches or stripes, depending on the printer. Sometimes you can wring a little bit more out of a toner cartridge by
taking it out and gently shaking it from side to side (never up and down,
as toner can spill out). You can also try turning up the printer’s
contrast adjustment, if it has such a knob (usually on the back side if it
exists). Faded print can also result from a dirty corona wire, because a
dirty wire inhibits a full electrical charge from being passed. If the printouts are consistently varied in density, and you have to
frequently remove the toner cartridge and shake it to redistribute the
toner inside it, make sure the printer is sitting on an even, flat
surface. Horizontal black lines A horizontal black line on the printout is probably the result of a
dirty or damaged roller. There are lots of rollers in the printer, and you
can use the space between the lines on the page to determine which roller
is causing the problem. Measure the distance between the errant black
lines on the page and then use Table A to determine which part
might be causing the problem.
between lines Faulty
cartridge developer roller
cartridge photo drum Regularly spaced splotches If there are evenly spaced black spots but they don’t extend all the
way across the page, the problem is probably a scratch or flaw in the drum
or a build-up of toner on the fusing roller. If the spots are less than
three inches apart vertically, it’s probably the drum, because the drum
has a larger diameter than the fusing roller. Vertical black line on edge of page This can indicate an almost empty or faulty toner cartridge or (less
frequently) some spilled toner inside the printer.
vertical lines can be caused by several things. Since you said that cleaned the rollers, then here are other options 1: Most common is a bad toner cartridge. 2: try cleaning the fuser entrance guide. 3: could be a defective formatter - formatter replacement the fix. 4: worn fuser. fuser replacement is the fix.
horizontal lines are probably repetitive down the page, and are usually caused by a defective toner cartridge or fuser assembly. occasionaly a transfer roller will cause it as well.
Toner loves to get baked onto the fuser and cause all kinds of print problems. Not much you can do but to replace the fuser when this happens.
sounds like the charge grid is not set properly in the drum unit..did you et up the drum unit properly and run the new dev and drum set up..if youy are getting black the charge is not working correct as the charge of the drum help to keep the toner from adhering to the drum surface when copying .. I would take the drum chrge unit out again and check it is set in the right way when you put it back on also check the contacts arent put out of line.
Does this happen both when copying and printing? For printing solution, try another toner cartridge. If lines continue to appear when copying (primarily through the automatic feeder) then lift the auto feeder, and clean the glass -mainly the narrow piece on the left side.
1- black lines are from the drum: it has burnt out on that particular spot and rotates
2- the white horizontal gap space if it is not you skipping space is also from the drum
3-the white Vertical is most likely from the developper (unit that has the toner and is against the drum, look at the roller it should be solid black, maybe there is something on it : hair paper etc....
Depends on whether the "lines" are colored or just blank areas missing in the print . If it is blank areas , then most likely the laser scanner is dirty and the glass needs to be cleaned . If it is colored lines , then you most likely have a defective drum .