Samsung SCX-4300-XAA - Manual (Page 42)

Maintenance
8.5
The following items should be replaced after you have printed
the specified number of pages, or when the life span of each
item has expired. The Smart Panel program window will appear
on the computer, indicating which item needs to be replaced.
To purchase consumable and replacement parts, contact your
Samsung dealer or the retailer where you bought your
machine. We strongly recommend that these items be installed
by a trained service professional, except for the toner cartridge
(see page 8.4).
Items Yield (Average)
Transfer roller Approx. 50,000 pages
Fuser unit Approx. 50,000 pages
Paper feeding roller Approx. 50,000 pages