If the printer control panel light sequence matches the light sequence in the preceding illustration, then do the following:
![](https://publications.lexmark.com/media/ids_assets/images/transparent.png)
Check if both the toner cartridge and imaging unit are Lexmark‑authorized MICR (magnetic ink character recognition) or non-MICR supplies.
![](https://publications.lexmark.com/media/ids_assets/images/transparent.png)
Change the toner cartridge or imaging unit so that both are Lexmark‑authorized MICR or non‑MICR supplies.