U4fi-8170

Fujitsu fi-8170 Error U4: Troubleshooting and Fix Guide

Error code U4 on the Fujitsu fi-8170 points to a communication timeout between the scanner and the host computer. This prevents the PaperStream driver from communicating properly. Resolving this quickly is essential for maintaining document processing uptime.

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Common causes

  • 1Damaged or non-compliant USB cable.
  • 2Insufficient power delivery from the host USB port.
  • 3Corrupted system driver files.

Solutions

Power Cycle Procedure

  1. Power off the scanner.
  2. Unplug the USB cable from both ends.
  3. Wait 30 seconds.
  4. Reconnect to a rear USB 3.0 port.

Driver Reinstallation

  1. Uninstall PaperStream IP from Windows.
  2. Download the latest version from the Fujitsu support site.
  3. Perform a clean installation.
  4. Restart your workstation.

Steps to follow

  1. 1

    Power Down

    Turn off the device and disconnect the power supply.

  2. 2

    Cable Check

    Inspect the USB cable for any visible physical damage.

  3. 3

    Direct Connection

    Plug the cable directly into the PC, bypassing any docking stations.

Frequently asked questions

Usually, U4 is a connectivity handshake issue rather than a hardware failure.

While they might work, USB 3.0 is required for the fi-8170's optimal speed performance.

Open Device Manager and check for yellow exclamation marks on the Fujitsu imaging device.