U3fi-8170

Fujitsu fi-8170 error U3: Sensor obstruction

The Fujitsu fi-8170 error U3 occurs when an obstruction is detected in the paper path. This is often caused by tiny scraps blocking the sensors. Use our guide for a deep cleaning.

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Common causes

  • 1Debris blocking sensor.
  • 2Dust on optical lens.
  • 3Staples in paper path.
  • 4Cover safety switch failure.

Solutions

Quick Diagnosis

If scanning halts upon sheet feed, check the sensor area for debris.

Step-by-Step Solution

  1. Open ADF and inspect for paper scraps.
  2. Clean sensors with compressed air.
  3. Check for leftover staples or clips.
  4. Close covers firmly to trigger sensors.

Prevention and Maintenance

Inspect paper documents. Avoid staples and detached stickers that cause internal debris.

When to call a technician

If sensors are clean but the error persists, the optical sensor circuit may have failed.

Ficha técnica del equipo

  • Technology: Duplex ADF.
  • Detection: Ultrasonic multifeed detection.
  • Connectivity: USB 3.2 / LAN.
  • Compatible consumables: Roller Kit fi-8170.
  • Recommended use: Heavy document scanning.
  • Drivers / Firmware

Steps to follow

  1. 1

    Check path

    Open ADF unit to inspect for paper scraps.

  2. 2

    Clean sensors

    Use compressed air to clean dust from optical sensors.

  3. 3

    Restart

    Ensure covers are closed properly and restart.