651ES5433

OKI ES5433 Error 651: Tray Sensor Failure

The OKI ES5433 error 651 occurs when the system detects that the paper tray is not securely closed or that the paper sensor cannot detect the load. This is a common issue when paper residue blocks the sensor path or when tray guides are misconfigured. Users asking why does my OKI ES5433 show error 651 often find simple physical blockages that prevent the sensor from functioning.

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Common causes

  • 1Blockage by paper residue or dust on the tray sensor.
  • 2Paper guides improperly adjusted for the document size.
  • 3Sensor plastic actuator damaged or out of position.
  • 4Misalignment of the tray due to overloading.

Solutions

Diagnóstico rápido

The error blocks printing. If the tray appears properly installed, the issue is with the internal sensor that should detect the tray actuator.

Solución paso a paso

  1. Remove the paper tray completely.
  2. Verify if paper scraps or dust cover the sensor located on the internal base.
  3. Adjust the side guides firmly against the paper.
  4. Reinsert the tray, ensuring it clicks fully into place.

Prevención y mantenimiento

Fan the paper before loading to reduce static electricity. Do not exceed the loading limit, as excess weight may misalign the sensor mechanism.

Cuándo llamar a un técnico

If the 651 error persists after cleaning and guide adjustment, the tray sensor could be electrically damaged and require replacement.

Ficha técnica del equipo

  • Technology: Color Laser A4
  • Capacity: Standard tray + options
  • Connectivity: USB, Gigabit Ethernet
  • Consumables: ES5433 Series Toner
  • Support: https://www.oki.com/support/es5433

Steps to follow

  1. 1

    Check tray

    Remove the paper tray and check for scraps blocking the sensor.

  2. 2

    Adjust guides

    Ensure the paper guides are tightly aligned with the loaded paper size.

  3. 3

    Cleaning

    Clean the paper pass sensor area with a dry cloth or compressed air.

Frequently asked questions

This error signals that the paper tray presence sensor cannot detect the load or size correctly.

It is usually a simple physical obstruction or a misalignment of paper guides.

Using poor quality paper or paper with folded edges can frequently cause the sensor to hang.

Fan the paper well before loading and do not exceed the tray's maximum capacity.