Lexmark MB2338
A 938.04A Service Engine Electronics Error appears on the printer display.
Power off the printer, wait for a few minutes and power it back on.
Remove the toner cartridge and replace it with a known good cartridge. Observe if the error remains.
Remove all the supplies (toner cartridge and imaging unit) from the printer.
Observe whether the printer posts a 31.xx and not 938.04A error after removing the supplies.
LEGACY ID: SO8891
An “Invalid Engine Code” error message indicates a problem with one of the internal operating programs of the printer. The printer is not able to receive, and process print jobs until the printer is reset.
121.xxA or 621.01A service fuser error message is prompted on the printer display.