Lexmark XS748 Supplies

The LEX C734X77G cartridge has an approximate yield of 25000 pages.

Yes — the XS748 uses a replaceable imaging drum: LEX C734X20G.

When the XS748 throws a "Supply Problem" error, the printer often simply can't read the cartridge chip. Give it a full power-cycle, take the cartridge out and put it back securely, and lightly buff the metal contacts with a dry, lint-free cloth. If it persists after all that, the cartridge is likely worn — install LEX C734X77G.