42.02MS431dw

Lexmark MS431dw error 42.02: Toner Detection Fix

The Lexmark MS431dw error 42.02 is a notification occurring when the installed toner cartridge is not correctly recognized. This error is frequently caused by dirty metallic contacts on the chip or an incorrect seating of the cartridge. If your Lexmark MS431dw shows error 42.02, follow our guide to clean the chip and restore the printer's communication with the toner.

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Common causes

  • 1Dirty or oxidized toner chip contacts.
  • 2Improper installation blocking electrical contact.
  • 3Incompatible toner chip stability.
  • 4Toner dust buildup in the docking area.

Solutions

Diagnóstico rápido

Error 42.02 is confirmed when the printer displays 'Invalid Cartridge' or 'Toner Not Detected'. Ensure the metallic chip is clean and undamaged.

Solución paso a paso

  1. Remove: Open the door and pull out the toner.
  2. Clean: Use a dry, lint-free cloth to clean the gold chip contacts.
  3. Inspect: Check the printer slot for any loose toner dust.
  4. Reinstall: Reinsert until it clicks firmly.

Prevención y mantenimiento

Avoid touching the chip contacts, as finger oils interfere with signals. Use original 55B consumables, as some third-party chips lack the stability required by the printer.

Cuándo llamar a un técnico

If the error continues with a brand-new original cartridge, the cartridge port or internal sensor may be damaged.

Ficha técnica del equipo

  • Technology: Monochrome Laser
  • Speed: 42 ppm
  • Connectivity: USB, Gigabit Ethernet, Wi-Fi
  • Paper Capacity: 350 sheets
  • Consumable: 55B Series
  • Recommended Use: Office printing
  • Official Drivers / Firmware

Steps to follow

  1. 1

    Remove Toner

    Open the front door and remove the toner cartridge.

  2. 2

    Clean Chip

    Gently clean the metallic contacts of the cartridge with a dry cloth.

  3. 3

    Reinstall

    Firmly insert the cartridge until it clicks into place.

Frequently asked questions

This occurs when the printer cannot communicate with the cartridge's smart chip.

Only if cleaning the contacts doesn't work, indicating a faulty chip.

The Lexmark 55B series is required; unofficial compatible cartridges often trigger this error.

Avoid touching the metallic chip contacts with your hands to keep them free of oils.

Lexmark MS431dw error 42.02: Toner Detection Fix | Vimazdev