840.xxE360dn

Lexmark E360dn error 840.xx: Imaging Unit Error

The Lexmark E360dn error 840.xx occurs when the printer fails to communicate with the toner cartridge or imaging unit's memory chip. This prevents the machine from verifying life-cycle data and causes the printer to lock up until the error is resolved.

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Common causes

  • 1Oxidation on the toner chip gold contacts.
  • 2Incorrect cartridge seating.
  • 3Defective or low-quality toner chip.
  • 4Damaged pins in the internal printer connector.

Solutions

Diagnóstico rápido

If the error appears after a cartridge change, it is almost certainly a chip reading issue. Ensure the cartridge is locked securely into the main assembly.

Solución paso a paso

  1. Extraction: Fully remove both the toner and imaging unit.
  2. Contact Cleaning: Gently clean the toner chip's gold contacts with a soft eraser.
  3. Reinstallation: Insert the cartridge firmly until you hear a clear click.
  4. Power cycle: Reboot the printer to re-read the memory data.

Prevención y mantenimiento

Never touch the chip contacts directly with fingers. Use only compatible E260/E360/E460 series supplies for consistent detection.

Cuándo llamar a un técnico

If the issue persists with multiple cartridges, the internal connector board may be at fault.

Ficha técnica del equipo

Frequently asked questions

Yes, it is often a matter of cleaning the gold chip contacts on the toner cartridge.

No, it prevents printing but does not harm the unit unless you force the cartridge.

Genuine E260/E360/E460 cartridges are best to avoid chip incompatibilities.

Handle new cartridges by their plastic housing, avoiding contact with the chips.