390ES5112

Error 390 OKI ES5112 Office: Troubleshooting

The OKI ES5112 error 390 indicates a temperature-related fault within the fuser unit. Why is my OKI ES5112 showing error 390? This typically means the fuser cannot reach the required operating temperature. Follow this guide to resolve the OKI ES5112 error 390 safely.

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Common causes

  • 1Fuser temperature sensor failure.
  • 2Mechanical damage to fuser film.
  • 3Paper path blockage causing localized overheating.
  • 4Power supply instability to the heater.

Solutions

Quick Diagnosis

Error 390 flags a problem where the heater unit cannot sustain the necessary heat. If the screen flashes this after several boot attempts, the internal thermal fuse or thermistor is likely triggered.

Step-by-Step Solution

  1. Power off: Unplug and wait at least 20 minutes for cooling.
  2. Check fuser: Open the rear door and extract the fuser to inspect for paper shreds.
  3. Clearance: Remove any debris causing thermal insulation.
  4. Restart: Reinstall firmly and restart the printer to clear the fault state.

Prevention and Maintenance

Avoid printing on media that exceeds the weight limit of the fuser. Regular air-flow maintenance keeps heat levels balanced.

When to Call a Technician

If the rollers have visible tears or the error code remains after manual reset, the unit requires professional replacement.

Ficha técnica del equipo

  • Technology: LED Laser printer
  • Speed: Up to 45 ppm
  • Connectivity: USB, Gigabit LAN
  • Capacity: 530-sheet tray
  • Compatible consumable: ES5112 series toner
  • Recommended usage: Medium-large offices
  • Official Drivers / firmware

Steps to follow

  1. 1

    Power off

    Allow the fuser 20 minutes to cool before handling.

  2. 2

    Check fuser

    Remove the unit and inspect for jams or damaged rollers.

  3. 3

    Restart

    Reinstall the unit and test the system.

Frequently asked questions

Error 390 indicates a temperature fault in the fuser; the system cannot reach the necessary operating heat.

Potentially, due to high heat levels; unplug immediately.

Uses ES5112-specific high-yield toner cartridges.

Avoid using heavy cardstock or unsuitable media.

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