Samsung SCX-8240NA-CAS - Manual (Page 191)

Troubleshooting_ 191
If toner gets on your clothing, wipe it off with a dry cloth and wash
clothing in cold water. Hot water sets toner into fabric.
6. Hold the toner cartridge and align it with the corresponding slot inside
the machine. Insert it back into its slot until locks in place.
7. Close the front door. Ensure that the door is securely closed.
If the front door is not completely closed, the machine will not
operate.
Cleaning paper dust stick and chargers of
imaging units
The paper dust stick and the charger of imaging unit will need to be cleaned
after the specified number of paper is printed out. When the message that
demands you to clean the charger appears, you have to clean the paper
dust stick first. Then clean the charger. The time when the message
appears depends on environmental factors like altitude, temperature,
humidity and so on. You need to clean the paper dust stick and the charger
to maintain printing quality. If cleaning is done, the message will disappear
automatically.
Follow the cleaning procedure below.
Click this link to open an animation about cleaning the charger of
imaging units.
1. Open the front door.
2. Hold the left/right locking levers and push outward at the same time.
Then remove the waste toner container. (CLX-9252 9352 Series)