Compatible Drum Unit DR E250 for Lexmark E250D/ E250DN/ E350D/ E350DN/ E352DN/ E450/ 450N/ 450DN / for Dell 1720/ 1720N
2.What points shall I need to pay attention to when installing a toner cartridge?
DO NOT touch Opc Drum or expose it in sunlight because it is coated with organic conductivity. 2. DO NOT turn around OPC Drum, which may cause toner leakage. 3. For HP and Canon Series, a sealing film needs to be torn off before installing toner cartridge. Shake cartridge gently for 6-8 times to loose Toner Powder inside before tearing off the sealing film.
3.What shall I do when "Toner Low" message shows? That means toner powder in cartridge is almost used out, take out cartridge from printer and share it gently for 3-4 times, you may print more 40-50 pages until "Replace Cartridge" message shows, then used cartridge need to be replaced with a new one.
4.Do you have any tips when I replace my toner cartridge?
After you take out the used cartridge, we would suggest you clean the cartridge carriage in the printer with tissue to get rid of paper scarps and toner powder, which may prevent paper jam. Clean the exposed electrical contacts with alcohol to keep smooth connection between cartridge and printer, which may avoid light color printout.
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