comm-errorGK420t Plus II

Zebra GK420t Plus II error COMM-ERROR: Quick Fix

The Zebra GK420t Plus II error COMM-ERROR occurs when the interface fails to synchronize with the host controller. This prevents data transmission, requiring users to verify cables or port settings to fix the COMM-ERROR on GK420t Plus II. This unit is a reliable desktop label printer designed for retail and logistics environments.

1 views

Common causes

  • 1Driver conflict: Corrupted installation or outdated controller version.
  • 2Physical interference: Low-quality data cables or excessive length.
  • 3Misconfiguration: The selected COM or USB port in software does not match hardware.
  • 4Mainboard failure: Circuitry damage on the printer's logic board.

Solutions

Quick Diagnosis

The error manifests when the status LED blinks orange. If the printer remains unresponsive to jobs, the failure originates in the communication protocol.

Step-by-Step Solution

  1. Verify the USB cable for any signs of physical damage.
  2. Access Windows Printer Properties and verify the assigned port.
  3. Uninstall and reinstall the official Zebra Setup Utilities driver.
  4. Power cycle both the printer and the host computer.

Prevention and Maintenance

Use cables under 2 meters to prevent EMI. Clean the thermal printhead with isopropyl alcohol to ensure consistent data flow and label output.

When to Call a Technician

If the printer remains unrecognized after switching ports or PCs, the mainboard may have sustained internal hardware damage.

Equipment Technical Data

  • Technology: Thermal Transfer and Direct Thermal
  • Throughput: 127 mm per second
  • Connectivity: USB, Serial RS-232, Parallel
  • Feeding Capacity: Up to 127 mm roll diameter
  • Compatible Consumables: Wax, Wax-Resin, and Resin ribbons
  • Recommended Use: Shipping labels, barcodes, wristbands
  • Official Drivers / Firmware

Steps to follow

  1. 1

    Check cables

    Disconnect and reconnect the USB or serial cable ensuring a secure fit.

  2. 2

    Check port

    Confirm in Device Manager that the COM port matches your software settings.

  3. 3

    Restart spooler

    Stop and restart the Windows print spooler service.

Frequently asked questions

This error means the computer is failing to maintain a stable data exchange with the printer.

It is usually a logical issue that is resolved by reconfiguring port settings on the host OS.

It uses standard wax or resin thermal transfer ribbons.

Cleaning is recommended every time you replace the media roll.