Print Unable 35MFC-EX670

Fix Brother MFC-EX670 Print Unable 35 Error

The 'Print Unable 35' error code on the Brother MFC-EX670 indicates a fault in the print head carriage positioning sensor. This error prevents the printer from completing its startup cycle and usually requires a forced reset or the clearing of a mechanical obstruction. It is a common issue in inkjet devices that have experienced a recent paper jam.

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Common causes

  • 1Presence of paper debris on the carriage slider rail.
  • 2Accumulation of dust or dried ink on the encoder strip blocking the sensor reading.
  • 3Mechanical misalignment of the carriage following a forced paper jam removal.
  • 4Failure of the stepper motor responsible for horizontal print head movement.

Solutions

Quick Diagnosis

Error 35 is confirmed when the ink carriage cannot move from left to right during initialization. If you hear a grinding or clicking noise before the code appears on the LCD panel, it confirms a physical obstruction or an issue with the encoder strip.

Step-by-Step Solution

  1. Unplug the power cable directly from the wall outlet while the printer is still powered on to force an immediate stop.
  2. Open the scanner cover and manually remove any paper scraps or foreign objects blocking the print carriage guide.
  3. Clean the encoder strip (a thin, clear plastic strip above the guide) using a lint-free dry cloth, avoiding any chemical cleaners.
  4. Close all covers and reconnect the unit to the power source, allowing the printer to perform its automatic self-calibration.

Prevention and Maintenance

Perform a head cleaning at least once a month if your print volume is low to prevent ink drying. Ensure the printer is placed on a flat, level surface to avoid carriage misalignment. Use only the recommended paper weights to prevent recurrent physical jams.

When to Call a Technician

If the error persists after cleaning the encoder strip and checking for obstructions, there may be an electrical failure in the carriage motor or the main board. Do not attempt to disassemble the chassis, as this will void your manufacturer warranty.

Ficha técnica del equipo

  • Technology: Inkjet (INKvestment Tank)
  • Print speed: Up to 20 ppm black / 19 ppm color
  • Connectivity: Wi-Fi, Ethernet, Hi-Speed USB 2.0
  • Paper capacity: 250-sheet standard tray
  • Compatible consumables: Brother LC406 / LC406XL series
  • Recommended use: Small office and high-volume home work
  • Official drivers / firmware

Steps to follow

  1. 1

    Power disconnection

    Unplug the power cord while the device is still powered on.

  2. 2

    Visual inspection

    Open the printer cover and look for foreign objects along the head rail.

  3. 3

    Sensor cleaning

    Gently wipe the encoder strip with a dry, soft cloth to remove grime.

  4. 4

    Power cycle

    Close covers and reconnect power to trigger the initialization cycle.

Frequently asked questions

This is considered a medium-to-high severity error. It means the printer cannot operate mechanically, so printing or scanning will be disabled until the mechanical issue is resolved.

A power cycle is often insufficient if there is a physical obstruction. You must clear the print carriage area by following the manual cleaning steps.

You must use genuine Brother LC406 or high-yield LC406XL series cartridges to ensure the tank system performs as designed.

Keep the printer in a low-dust environment, never force paper out during a jam, and run maintenance cleanings through the control panel quarterly.