Lexmark MS310
‑ On
If the printer control panel light sequence matches the light sequence in the preceding illustration, then you may need to order a toner cartridge. If necessary, press on the printer control panel to continue printing.
"42" or "42.xx" Toner Cartridge Mismatch Error
Here are troubleshooting steps for a ‘121.xx’ Service Fuser Error (except for 121.02. 121.16, 121.41 and 126.01).