Dell E515dw User Manual page 321

NOTE
DO NOT clean the surface of the photosensitive drum with a sharp object or any liquids.
8. Put the new toner cartridge firmly into the drum unit until you hear it lock into place.
NOTE: Make sure you put the toner cartridge in correctly or it may separate from the drum unit .
9. Install the toner cartridge and drum unit assembly back into the machine.
10. Close the front cover of the machine.
11. Press to turn on the machine.
Routine Maintenance 321