HP 2425 - Manual (Page 41)

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In your laser printer, characters and images are created through a
process that applies toner (made of carbon particles) to the page in
the printer’s fusing unit. When an image is formed, heat and pressure
are applied to transfer the image to the page. The toner cartridge con-
tains the toner and photosensitive drum needed to operate the laser
printer.
You may purchase additional toner cartridges from your QMS vendor.
See appendix B, “Technical Specifications,” of the
Reference manual
for specifications.
1 Open the top cover, if it’s not already opened.
2 Lift the toner cartridge out of its shipping carton, open the
protective bag, and remove the cartridge.
» Note: After taking the toner cartridge from its protective bag, do
not open the cover or touch the photo-sensitive drum of the toner
cartridge because it may deteriorate the drum and reduce print
quality.
3 Remove the black protective sheet, and discard it.
Place the cartridge on a stable, flat surface to get a good grip on
the white protective tape. Lift the tape, pull gently to remove it with
the black protective sheet, and discard it.