The drum is the part of the printer that the image of what you want to print is stored on by a laser drawing on that drum. That drum is then charged with an electrostatic shock that will draw up toner particles from your toner tray that will eventually be transferred to a piece of paper that will be heated to fuse the ink particles on the paper. That drum is photo sensitive and eventually looses its ability to be charged. You will then have to replace that drum.
Drum is the part of print cartridge of laser printer. It give the warning
message to change the cartridge. You change the cartridge when the
print get poor quality.
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