31.03MX911dte

Lexmark MX911dte 31.03 Error: Step-by-Step Fix

The Lexmark MX911dte 31.03 error is a service code alerting of a failure in tray 3 path or sensor. This happens when the paper detection actuator remains pressed or fails to return to its original position. To fix the 31.03 error on the Lexmark MX911dte, perform a physical inspection inside the loading cavity.

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Common causes

  • 1Persistent paper jam debris in sensor area.
  • 2Worn or broken tray 3 actuator spring.
  • 3Dirt buildup on the sensor's optical cell.
  • 4Tray controller software misconfiguration.

Solutions

Quick Diagnosis

31.03 usually appears after a jam. If the printer doesn't recognize the tray even when full, the paper sensor is likely dirty or obstructed by debris.

Step-by-Step Solution

  1. Remove tray 3 completely and check inside the chassis.
  2. Look for paper debris stuck to the sensor actuator.
  3. Gently press the actuator; the spring should push it back freely.
  4. Power off for 10 seconds and power back on to clear the error buffer.

Prevention and Maintenance

Avoid loading paper with staples or clips. Weekly visual checks of paper guides are recommended. Keeping the interior dust-free prevents actuators from sticking.

When to Call a Technician

If the 31.03 message remains after cleaning and verifying the actuator, the sensor cable might be cut or the tray controller board needs professional attention.

Equipment Technical Data

  • Technology: SRA3 Laser MFP
  • Speed/Performance: 45 ppm
  • Connectivity: USB 2.0, Gigabit Ethernet
  • Feeding Capacity: Expandable to 6,650 sheets
  • Compatible Consumable: Genuine Lexmark MX911 toner series
  • Recommended Use: Enterprise printing
  • Official drivers / firmware

Steps to follow

  1. 1

    Check tray 3

    Remove paper tray 3 and look for any torn paper scraps.

  2. 2

    Verify actuator

    Check that the paper end sensor actuator moves up and down freely.

  3. 3

    System restart

    Close the tray and power cycle the printer to clear the error code.

Frequently asked questions

Error 31.03 points to a specific failure in tray 3 paper detection, usually due to a blocked sensor.

Yes, if the error only occurs on tray 3, you can set the printer to pull from other sources while repairing the fault.

It uses the Lexmark 911dte series toner, built for high-capacity uninterrupted printing.

Never force the tray if you feel resistance; re-adjust the paper and try again smoothly.

Lexmark MX911dte 31.03 Error: Step-by-Step Fix | Vimazdev