u4fi-6400

Fujitsu fi-6400 Error u4: ADF Jam Fix

Fujitsu fi-6400 error u4 flags an obstruction or failure within the document transportation system of the Automatic Document Feeder. The scanner stops processing when it detects a document has failed to advance correctly. This guide outlines how to inspect the feed path and return the scanner to operational status.

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Common causes

  • 1Soiled rollers: Dust and debris reduce grip.
  • 2Misloaded docs: Guides not matching document width.
  • 3Obstructed sensors: Residual glue or paper bits blocking detection.
  • 4Damaged originals: Ripped sheets snagging on the feed path.

Solutions

Diagnóstico rápido

Persistent error u4 suggests that the pick rollers are failing to grip the paper. Look for visible smooth spots on the rubber rollers, which indicate age-related wear.

Steps to follow

  1. 1

    Open ADF

    Use the release lever to open the scanner cover.

  2. 2

    Clear jam

    Gently remove any documents causing the obstruction.

  3. 3

    Clean sensors

    Wipe optical sensors with a dry, lint-free cloth.

Frequently asked questions

It indicates a jam in the Automatic Document Feeder (ADF).

No, it's typically caused by paper debris or misaligned documents.

Fujitsu F1 cleaner is recommended for best roller health.

Perform cleaning every 50,000 scans or when performance starts to drop.