E31Fujitsu PrintPartner V40Has video

How to Resolve Error E31 on Fujitsu PrintPartner V40

Error code E31 denotes a toner density sensor error on the Fujitsu PrintPartner V40. The engine microcontroller detects out-of-range density measurements from the internal optical reading system.

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Common causes

  • 1Stray toner dust blocking the sensor's optical emitter/receiver.
  • 2Poor quality developer mix within a third-party toner cartridge.
  • 3Deformed contact terminals on the cartridge mounting bracket.

Solutions

Cleaning and Restoring the Density Sensor

  1. Locate the Internal Sensor: Remove the toner cartridge. The optical sensor window is situated near the development cavity interface.
  2. Gently Clean the Lens: Use a dry microfiber tip to gently sweep any accumulated stray toner dust off the tiny optical glass window.
  3. Redistribute Toner Powder: Gently shake the cartridge side-to-side several times before re-installing to ensure correct developer mixing inside the hopper.
  4. Clean Electronic Pin Contacts: Wipe down the contact terminals with quick-drying electronic cleaner to avoid high-resistance faults.

Steps to follow

  1. 1

    Extract the Cartridge

    Turn off the printer, lift the primary cover, and slide out the toner development unit.

  2. 2

    Wipe the Sensor Window

    Clean the receiver window located inside the housing frame using a dry cotton swab.

  3. 3

    Reinsert and Initialize

    Shake the cartridge, slide it firmly back into place until it clicks, and run a self-test print cycle.

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Frequently asked questions

Not necessarily. Shaking the current cartridge and cleaning the sensor inside the machine often resolves the E31 code successfully.

How to Resolve Error E31 on Fujitsu PrintPartner V40 | Vimazdev