938.04A Service Engine Electronics Error

Issue description

A 938.04A Service Engine Electronics Error appears on the printer display.

Solution

1. Power off the printer, wait for a few minutes and power it back on.



2. Remove the toner cartridge and replace it with a known good cartridge. Observe if the error remains.



3. Remove all the supplies (toner cartridge and imaging unit) from the printer.



4. Power off the printer, wait for a few minutes and power it back on.



5. Observe whether the printer posts a 31.xx and not 938.04A error after removing the supplies.

   • Should the printer posts 31.xx, reinstall back the supplies one at a time (imaging unit first then toner cartridge) until the 938.04A error re-appears.
   • Replace the defective supply once it is narrowed down.