0x40EcoTank Pro ET-5850

Epson EcoTank Pro ET-5850 Error 0x40: Troubleshooting

The Epson EcoTank Pro ET-5850 error 0x40 is a warning that the mechanical system detects an obstruction along the printhead path. When asking why does my Epson EcoTank Pro ET-5850 show error 0x40, the culprit is often jammed paper or residue blocking the carriage rail. This device is ideal for high-volume printing thanks to its continuous ink system.

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Common causes

  • 1Physical blockage from paper debris inside the unit.
  • 2Dirt on the encoder strip preventing correct position detection.
  • 3Mechanical wear on rails causing resistance during movement.
  • 4Issue with the printhead carriage motor power supply.

Solutions

Quick diagnosis

The 0x40 error stops the carriage in an unusual position or during the print cycle. Listen for grinding noises when trying to move the carriage manually.

Step-by-step resolution

  1. Power off the printer immediately to avoid straining the carriage motor.
  2. Lift the scanner unit and observe the printhead carriage trajectory.
  3. Remove any debris (torn paper, labels, staples) found on the timing strip or rails.
  4. Clean the timing strip (transparent plastic strip) carefully if ink spots are present.

Prevention and maintenance

Perform regular cleaning of the internal area to remove paper dust. Ensure paper is correctly adjusted in the tray guides.

When to call a technician

If the 0x40 error persists after clearing the carriage, the motor or the timing strip might be damaged and require professional repair.

Technical specifications

  • Technology: PrecisionCore Inkjet
  • Capacity: High-volume EcoTank system
  • Connectivity: USB, Ethernet, Wi-Fi
  • Compatible consumable: Original Epson 542 Ink Bottles
  • Official drivers / firmware

Steps to follow

  1. 1

    Power off

    Turn off the printer and unplug it immediately.

  2. 2

    Open scanner

    Lift the scanner unit to access the internal mechanism.

  3. 3

    Inspect carriage

    Look for and remove any debris, paper scraps, or objects blocking the head.

Frequently asked questions

The 0x40 code indicates an obstruction or movement failure of the printhead carriage. The printer detects resistance when trying to move.

Avoid overloading the paper tray and ensure paper is properly aligned before printing starts.

Always use original Epson 542 series ink bottles to ensure long printhead life.

Perform head cleaning only if print quality decreases; over-cleaning can wear out the waste ink pads prematurely.