Error code 331 - Xante Ilumina® 502 Laser Printer

It is math error. See user manual page 331 Appendix 1 for help.

Appendix 1. Error Message Table - Casio fx-9750GII User Manual [Page 331] ' ManualsLib

Also on Casio website.
Errors (casio.com)

Question edited for clarity.

Power Cycle it.

Fault Code 116-331

Xerox https://www.support.xerox.com > en-us > article
Jan 19, 2021 - Power off/on the printer. For details, refer Power Off the Printer Using the Power Switch. Wait Two Minutes and Then Power On the Printer.
Missing: C4430 ‎' Show results with: C4430

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  Fault Code 116-331: Invalid Log Information

  https://www.support.xerox.com > en-us > article
  Jun 25, 2021 - Fault Code 116-331: Invalid Log Information · Try these solutions · Did this help?

Thread: Error 116-331

Copytechnet https://www.copytechnet.com > ... > Xerox
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More results from www.copytechnet.com Missing: C4430 ‎' Show results with: C4430

Need urgent help with Error Code 116-331! It's a PrimeLink ...

Reddit https://www.reddit.com > Xerox > comments > need_u...
Nov 26, 2022 - 116-331 is usually just a corrupted job. Power off the machine using the button behind the front door. (not the button on top). Press and hold # ...

This error code could indicate an issue with the drum or fuser. Ensure that the toner cartridge/drum has been seated correctly, and if necessary contact a qualified technician or Xerox support to further investigate and resolve the issue.

Switch the power off, remove the HD, switch the power on, wait until machine warming up.
Switch the power off, reinstall the HD, and switch the power on.

Try this link:

http://forum.support.xerox.com/t5/Hardware/Incident-codes-303-331-00-and-302-321-00-when-trying-to-print/td-p/20797

This is a Windows only product.

Hi tamerandaman,

The error ##331 meant that the level of ink cartridge , can not be detected.

Follow the steps to resolve this error

1. resave the detection level Ink by entering the service mode
2. replace the ink detector

I hope the issue should get resolved. Please dont forget to rate me. Thanks in advance. Have a great day.....

the error code ##331, means that the ink level can not be detected it can be a problem of ink level detector; you need to resave your ink level. to resave the ink level: look at this link: http://www.fixya.com/support/r6643185-waste_ink_tank_full_fax_b120_b140_b820 if you need a clarification you have to add a comment to this solution.

carriage unit faulty

The level of ink cartridge , can not be detected Solution :

1. resave the detection level Ink by entering the service mode
2. replace the ink detector