Xerox 127-35x/39x — Network controller fatal errors

What this error means

The network controller (the machine's job-processing computer) hit a fatal software error — often triggered by a specific job. Power off 20 seconds, purge the sending queue, resubmit; firmware update if it recurs.

Symptoms

• Crash while processing a job
• Same document reproduces it

Try this first (safe DIY steps)

1. Power off ~20 seconds, on
2. Delete the job from the sending computer's queue before reconnecting
3. Re-export/flatten the offending document
4. Firmware update if recurring

Safety: power off before any physical intervention. Never bypass covers or interlocks — fuser areas run hot enough to burn.

When to call a technician

Recurring after firmware — controller service.