Samsung SCX-8240NA-CAS - Manual (Page 196)

Troubleshooting_ 196
4. Pull the corresponding imaging unit out from the machine.
5. Remove the new imaging unit from its package.
Do not use sharp objects, such as a knife or scissors, to open the
imaging unit package. You could damage the surface of the
imaging unit.
6. Remove the paper protecting the surface of the imaging unit.
7. Remove the tape on the handle.
8. Pull the rubber stopper out of the developer.
9. Remove the tape wrapped around the developer.
10. Remove the tape on the imaging unit.