5b00MAXIFY GX4020

Canon MAXIFY GX4020 error 5b00: Maintenance Box Full

The Canon MAXIFY GX4020 error 5b00 is a standard notification that the maintenance box (waste ink absorber) has reached its saturation limit. The printer locks all functions to prevent waste ink from damaging internal electrical components. Replacing this box is the only safe method to restore equipment functionality.

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Common causes

  • 1Frequent head cleaning cycles saturating the reservoir.
  • 2Page print limit reached according to factory counter.
  • 3Waste ink overflow due to prolonged use without maintenance.
  • 4Level sensor failure in the maintenance box.

Solutions

Diagnóstico rápido

The 5b00 code is very precise: the ink absorber is physically full. If the printer suddenly stops responding and displays this code on the panel, verify the maintenance box counter. Do not attempt to bypass software without changing the box, as it will cause serious ink spills.

Solución paso a paso

  1. Buy a compatible MC-G03 maintenance box.
  2. Locate the access cover on the back of your Canon GX4020.
  3. Remove the safety screw and slide the box out.
  4. Insert the new maintenance box until it clicks firmly into place.
  5. Close the cover; the printer will recognize the new box and clear the 5b00 message automatically.

Prevención y mantenimiento

Maintenance box life depends on the number of head cleaning cycles performed. Avoid unnecessary cleanings to extend component life. Always have a spare maintenance box on hand if print volume is high.

Cuándo llamar a un técnico

If the 5b00 error persists after changing the box and restarting the printer, there may be a problem with the mainboard or the EPROM counter.

Ficha técnica del equipo

  • Technology: Inkjet with refillable tank
  • Speed: 24 ipm (black), 15.5 ipm (color)
  • Connectivity: Wi-Fi, Ethernet, USB 2.0
  • Capacity: 250 sheets standard
  • Compatible consumable: MC-G03 maintenance box
  • Recommended use: Small office and home
  • Official drivers / firmware

Steps to follow

  1. 1

    Locate box

    Find the maintenance box on the back or bottom of the printer.

  2. 2

    Replacement

    Remove the old box and install a new original one.

  3. 3

    Reset

    The printer will automatically detect the change and clear the error.

Frequently asked questions

This error means the maintenance box (waste ink absorber) has reached its maximum capacity.

No, you must replace the component to avoid internal ink spills.

It uses the MC-G03 maintenance box.

It is a user-friendly process that requires no complex tools.