Samsung SCX-8128NA-XAA - Manual (Page 162)

Supplies and accessories_ 162
Checking replaceable’s lifespan
If you experience frequent paper jams or printing problems, check the
remaining lifespan of supplies. Replace the corresponding parts, if
necessary.
1. Press Machine Setup > Others > Supplies Life from the main screen.
2. Check the supplies life.
3. Press Back for return to the previous screen.