SOURCE: printer prints white thick blank lines
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....
SOURCE: hp laserjet 4 plus - keep getting a horizontal black line
yes you have to catch printer making the line and then as a page is being printed you need to open door to stop paper after green cylinder(drum) as it is entering fuser, then you need to remove paper from printer without pulling through the fuser, if you see the line then rub your finger across line up and down page, if it smears at all then its the cartridge if not then the fuser
SOURCE: printing with a black horizontal line across bottom of the page
Wipe the cartridge.Use cotton but dont put water on it only cotton.if you have deiones water its good to use.
SOURCE: hp 2500l prints a dark line horizontal down each
A dark line on the hp 2500 series can come from the drum You can't clean it at home), it can come from a toner cartridge, from the fuser unit and from the optics.
Step one - check if the line in all colors, run copy quality check through Menu and diagnostics, if the line is only on one color your problem is the toner cartridge.
Step two - if the line is on all colors, take the drum unit out and look at the drum, if you see the line on the drum you need to replace the drum unit.
Step three - stop a print in during the printing process by turning the printer off, take out the drum and look at the printed paper under the drum, if the printed page is clear of line your problem is in the fuser.
Good luck.
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