390C931dn

OKI C931dn error 390: Solution & Troubleshooting

The OKI C931dn error 390 is a common alert indicating a communication issue between the printer and the paper tray. Why does my OKI C931dn show error 390? This often occurs when the sensor fails to confirm the tray's position. Proper seating of the tray usually resolves the problem for this high-speed printing device.

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Common causes

  • 1Tray misalignment: prevents the sensor from triggering.
  • 2Debris blockage: paper scraps interfering with the optical sensor.
  • 3Wear and tear: connector degradation from high usage.
  • 4Board communication error: temporary logic failure.

Solutions

Diagnóstico rápido

The error appears on the LCD panel when the printer cannot detect the primary tray. Ensure the tray is not jammed and that no internal paper fragments are obstructing the optical sensor.

Solución paso a paso

  1. Power off the printer to ensure safety during the inspection.
  2. Remove the tray fully and inspect for any paper debris.
  3. Clean sensors with a dry, lint-free cloth if dust is visible.
  4. Reinsert the tray until a distinct click is heard.
  5. Power on and verify the message has cleared.

Prevención y mantenimiento

Clean feed rollers every 50,000 prints. Use genuine consumables for sensor precision. Keep the printer environment free of excessive dust.

Cuándo llamar a un técnico

If the error persists after checking the tray, the sensor or internal board may require professional replacement.

Ficha técnica del equipo

  • Technology: High-definition LED printing.
  • Speed/Performance: Up to 50 ppm color/mono.
  • Connectivity: Ethernet, USB 2.0.
  • Feed Capacity: 530 sheets standard.
  • Consumable Compatible: C900 Series High-Capacity Toner.
  • Recommended Use: Enterprise high-volume printing.
  • Drivers / official firmware

Steps to follow

  1. 1

    Power cycle

    Switch off the printer and disconnect the power cord for at least 60 seconds.

  2. 2

    Check tray

    Remove the paper tray and inspect for debris or jammed paper fragments.

  3. 3

    Realign

    Reinsert the tray, ensuring it clicks firmly into the guide tracks.

  4. 4

    Test

    Power on the device and perform a test print to confirm the error is cleared.

Frequently asked questions

Error 390 signifies a tray communication error, often caused by improper seating or sensor obstruction.

It is not a permanent hardware failure, but it prevents paper feeding until resolved.

The C931dn requires high-capacity C900 series toner cartridges to ensure optimal sensor performance.

Regularly clean feed rollers and ensure paper is properly aligned within the tray guides.

OKI C931dn error 390: Solution & Troubleshooting | Vimazdev