Lexmark CS510de User Manual page 145

Maintaining the printer
3
Unpack the new toner cartridge, and then remove its packaging.
4
Align the new toner cartridge, and then press the cartridge down until it fits into place.
5
Close the top door.
6
Seal the used toner cartridge in the bag that the replacement toner cartridge came in before disposing.
For more information, see "Recycling Lexmark products" on page 123.
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