Lexmark MS310d Quick Refence Manual page 43

If the printer control panel light sequence matches the light sequence in the preceding illustration, then press
twice quickly to see the supplemental light sequence.
‑ On
‑ Blinking
‑ On
If the supplemental light sequence matches the light sequence in the preceding illustration, then replace the toner
cartridge. For more information, see the instruction sheet that came with the supply or see the "Replacing supplies"
section of the User's Guide.
Note: If you do not have a replacement toner cartridge, then see the "Ordering supplies" section of the User's Guide
or visit www.lexmark.com.
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