121.05Lexmark CX625adhe

Fix Lexmark CX625adhe Error 121.05: Troubleshooting Guide

Error 121.05 on the Lexmark CX625adhe occurs when the registration sensor fails to detect media correctly. This error prevents the printer from jamming further by halting the paper path. Regular maintenance of the sensor area usually resolves this issue.

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Common causes

  • 1Toner dust buildup obscuring the optical sensor.
  • 2Small paper fragments trapped near the registration gates.
  • 3Mechanical sensor arm stuck due to wear.

Solutions

Sensor Cleaning

  1. Power off the printer and unplug it.
  2. Open the front door and remove the toner cartridge.
  3. Locate the registration sensor.
  4. Blow away dust with compressed air.

Clearing Paper Path

  1. Pull out all paper trays.
  2. Check for small paper scraps inside the unit.
  3. Ensure the rollers are free of debris.

Steps to follow

  1. 1

    Power down

    Switch off the device and disconnect power.

  2. 2

    Access internal unit

    Open front cover and remove the print cartridge.

  3. 3

    Clear and clean

    Clean the sensor area with compressed air.

Frequently asked questions

It is often a sensor contamination issue rather than a hardware failure, usually resolved by cleaning.

It is not recommended. Use only dry compressed air to prevent residue buildup.

A power cycle may temporarily clear it, but cleaning the sensor is required for a permanent fix.