390C931e

OKI C931e Error 390: Fix and Troubleshooting Guide

The OKI C931e error 390 indicates a communication fault with the paper tray that halts printing. This error typically occurs when the tray lift mechanism fails to respond correctly. As a heavy-duty production printer, the C931e requires periodic maintenance to clear sensor pathways and prevent these technical interruptions.

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Common causes

  • 1Debris blocking tray gear mechanisms.
  • 2Worn feed rollers failing to trigger sensor switches.
  • 3Temporary electronic glitch in the controller board.
  • 4Toner dust buildup obscuring optical sensors.

Solutions

Diagnóstico rápido

Error 390 appears when the paper tray fails to signal the controller properly. If the printer makes unusual mechanical noises from the base, check for physical obstructions first.

Solución paso a paso

  1. Power Cycle: Turn off the printer, unplug for 30 seconds, and restart.
  2. Inspect Trays: Remove paper trays and ensure no debris is blocking the path.
  3. Sensor Cleaning: Use canned air to blow out dust from the internal tray sensors.
  4. Firmware Update: Verify you are running the latest firmware version.

Prevención y mantenimiento

Keep the printer in a dust-free environment. Clean the feed rollers quarterly. Using original OKI toner prevents internal contamination and sensor wear.

Cuándo llamar a un técnico

If the error persists after a hard reset, the internal tray motor or main board may need replacement.

Ficha técnica del equipo

  • Technology: Digital LED
  • Speed: 50 ppm color/mono
  • Connectivity: USB 2.0, Ethernet 10/100/1000
  • Input capacity: 530 sheets
  • Compatible Consumables: C900 Series Toner (Cyan, Magenta, Yellow, Black)
  • Recommended Use: Professional graphics and corporate environments
  • Official Drivers / Firmware

Steps to follow

  1. 1

    Power Cycle

    Turn off the printer and unplug the power cable for 30 seconds.

  2. 2

    Check Trays

    Remove the paper trays and inspect for obstructions or debris.

  3. 3

    Restart

    Plug in and power on the device to re-initialize sensors.

Frequently asked questions

This error signifies a communication failure between the main controller and the paper tray sensors.

It is not critical, but prevents paper intake and requires prompt resolution.

Use C900 series toner cartridges to ensure optimal performance and long-term hardware reliability.

Regular sensor cleaning every 50,000 prints prevents tray-related communication errors.