Zebra Printer GX420t

Clean it thoroughly with 90% medical-grade alcohol and a fiber-free cleaning swab.

Let alcohol dissipate and the printer dry completely.

Use a cleaning swab to remove debris, dust or crust that has built-up on the holders, guides and media path surfaces.

1. Use the alcohol in the cleaning swab to soak the debris to break up the adhesive.

2. Wipe the ridges to remove accumulated debris.

3. Wipe the inside edges of both edge guides to remove any built-up residue.

4. Wait one minute before closing the printer.

Discard the cleaning swab after use.

Let the printhead to cool for a minute

Use a new cleaning pen to swab the dark line on the printhead cleaning from the center to the outside edges of the printhead

Select the interval of cleaning

When you load new media, you can also clean the printhead.

Rub the cleaning pen across the dark area of the printhead. Clean from the middle to the outside.

Wait one minute before closing the printer.

Sign off on the printhead cleaning

Warning: This maintenance check requires trained personnel with PPE!

If the platen roller is not clean, follow the steps below to clean it.

Step 1: Open the cover (and dispenser door). Remove media from platen area.

Step 2: Pull the platen bearing latch release tabs on the right and left sides towards the front of the printer and rotate them up.

Step 3: Lift the platen out of the printer’s bottom frame.

Step 4: Clean the platen with the alcohol moistened swab. Clean from the center out. Repeat this process until the all of the roller surface has been cleaned. If there has been heavy adhesive build-up or label jam, repeat with a new swab to remove residual contaminates.

Step 5: Install the platen in the printer. Discard the cleaning swabs after use - do not reuse.

Step 6: Make sure the bearings and drive gear are on the shaft of the platen.

Before following the steps in this procedure, open the printer by pulling the release latches forward then lifting the top cover.

Open the printer. Remove any transfer ribbon from the printer.

Use a small flat bladed screwdriver to remove the ribbon guide. Gently pry the guide right-side tab from the ribbon frame. Pull the left side of the ribbon guide out.

Use a blunt tipped tool to press the release tab on the right side and then the left side of the printhead. The tool diameter can be from 0.10 to 0.15 inches (2.5 to 3.8 mm). Insert the tool into the ribbon frame's printhead release access (the round) opening. Push the release tab and gently pull the printhead bracket down.

Gently but firmly pull the two printhead cable bundles’ connectors off of the printhead.

Gently but firmly pull the green ground wire off the printhead.

Push the left side printhead connector into the printhead. The connector is keyed to only insert one way.

Connect the green ground wire to the printhead.

Push the right side printhead wire connector onto the printhead.

Warning: Do not use an air compressor - oil (from the pump) and dirty water will contaminate the printer and printhead.

Dust brushed or blown away from the media sensors

Dry swab used to brush away dust

Alcohol moistened swab used to break up adhesives or other contaminates

Dry swab used to remove any residue left from the first cleaning

All residue and streaks removed from the sensor

Sign off on the sensor cleaning