c-5151bizhub 4750i

Konica Minolta bizhub 4750i C-5151 Error: Scanner Fix

The Konica Minolta bizhub 4750i C-5151 error indicates a fault within the document scanning system. Usually, this code is triggered when the scanner head motor fails to calibrate correctly upon power-up. Learning how to fix scanner error C-5151 on bizhub 4750i is essential to restoring the machine's full functionality and clearing the panel lock.

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Common causes

  • 1Debris or hardened dust on the scanner guide rails.
  • 2Faulty home-position sensor causing calibration failure.
  • 3Mechanical wear in the scanner drive gears.
  • 4Worn-out flat data cable (FPC) within the scanner assembly.

Solutions

Diagnóstico rápido

If the display reads C-5151 when you trigger a scan, the optical unit is likely stuck. A clicking sound from the top cover suggests the scanner head is hitting an obstruction, such as dust or a piece of foreign material, preventing a smooth calibration.

Solución paso a paso

  1. Cleaning: Clean the scanner glass with a soft, lint-free microfiber cloth.
  2. Hard Reset: Power off the unit, unplug, and wait 2 minutes to allow the scanner head to re-calibrate upon restart.
  3. Head Verification: Listen for the return movement of the scanner head at startup; do not force the scanner assembly.
  4. Operational Test: Try a simple one-page document scan to test the lamp and motor response.

Prevención y mantenimiento

Regularly wipe the glass surface with a lint-free cloth. Ensure the automatic document feeder (ADF) area is free of staples or clips, as these are the leading causes of scanner head obstructions.

Cuándo llamar a un técnico

If the error repeats or the mechanical grinding noise persists, the motor assembly or the internal scanner data cable is likely worn and needs a technician's repair.

Ficha técnica del equipo

  • Technology: Laser scanner with DADF
  • Speed/Performance: 47 ppm
  • Connectivity: USB/Network
  • Paper Capacity: 600 sheets
  • Compatible Consumables: (Scanner unit, internal part)
  • Recommended Use: High-volume document scanning offices
  • Official Drivers / firmware

Steps to follow

  1. 1

    Cleaning

    Clean the scanner glass with a soft, lint-free microfiber cloth.

  2. 2

    Hard Reset

    Power off the unit, unplug, and wait 2 minutes to allow the scanner head to re-calibrate upon restart.

  3. 3

    Head Verification

    Listen for the return movement of the scanner head at startup; do not force the scanner assembly.

Frequently asked questions

The C-5151 code means the scanner head motor is failing to locate its home position or the lamp is faulty.

The machine will lock up and prevent all scanning or copying operations until the optical unit is functional again.

Only use ammonia-free cleaner or distilled water on a microfiber cloth to prevent glass damage.

It is rare, but can occur due to debris buildup or if the printer has sustained physical impact.

Konica Minolta bizhub 4750i C-5151 Error: Scanner Fix | Vimazdev