31,004.40:6909: it's a mechanical initialization jam error. Pull out the paper tray to make sure it doesn't have a jam. Try also to manually feed some heavy paper or card stock through the printer to make sure the sensor in the preheater isn't stuck.
39,002.40 : DRAM test failure.
39,012.40:56208: "Cycle the power" and if that does not work replace the document feeder.
39,012.41: Document Feeder Optical Failure. Replace the document feeder.
4,0XX.6x: Process Control Software Fault.
Reset NVRAM and then retest.
Ensure ground integrity for the system
Replace the EEPROM chip.
Reboot the system.
From the System Setup menu, go to "Information", "Troubleshooting"
Service Tools menu.
With the cursor at the top of the Service Tools menu, press both the Up Arrow
and Down Arrow buttons to display the Hidden Service menu.
Reset NVRAM is in there.
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