Print Unable 35DCP-T720DW

Brother DCP-T720DW: Print Unable 35 Error Fix

The 'Print Unable 35' error indicates a malfunction in the scanner assembly unit. The printer is unable to perform its initial calibration. To resolve this, ensure the scanner carriage can move freely and perform a full power reset.

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Common causes

  • 1Physical obstruction: residue on the rail stopping the carriage.
  • 2Voltage spikes: causing the stepper motor to desynchronize.
  • 3Ribbon cable wear: internal cable fatigue due to usage.
  • 4Optical sensor failure: component degradation over time.

Solutions

Diagnóstico rápido

This error points to a communication failure between the scanner sensor and the mainboard. Confirm if you hear the scanner motor trying to engage or if it remains completely silent during startup.

Solución paso a paso

  1. Unplug the power cord and wait 10 minutes to clear the machine's buffer memory.
  2. Inspect the scanner glass for any adhesive debris that might block the light sensor.
  3. Gently move the carriage manually to ensure it glides without friction across the scanning rail.
  4. Plug the printer back directly into a wall outlet to rule out power fluctuation issues.

Prevención y mantenimiento

Do not press down on the scanner lid. Keep the scanner glass clean using a microfiber cloth, avoiding liquid cleaners which can seep into the sensor assembly.

Cuándo llamar a un técnico

If the reset does not work, the scanner motor or the ribbon cable connecting the sensor to the motherboard may be physically damaged.

Ficha técnica del equipo

  • Technology: CIS Scanner
  • Resolution: Up to 1200 x 2400 dpi
  • Connectivity: Wi-Fi, USB
  • Compatible consumable: BTD60BK, BT5001C/M/Y ink
  • Recommended Use: High-volume scanning
  • Official drivers / firmware

Steps to follow

  1. 1

    Power off

    Disconnect from the power source.

  2. 2

    Check carriage

    Verify the scanner module moves freely.

  3. 3

    Clean glass

    Ensure no debris is on the scanner bed.

  4. 4

    Reset

    Reconnect and power on to re-calibrate.

Frequently asked questions

No, the printer firmware locks all operations until the scanner calibration is verified.

Often it is just a mechanical jam, but it can indicate the end of the motor lifespan.

Always use original Brother inks to prevent printhead and internal clogging.

Keep the machine away from vibrations and handle the scanner lid gently.

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