Zebra Zebra Industrial Printer ZT420 ZT420

Warning: Turn off and unplug the printer before cleaning.

Exterior of the printer cleaned with a lint-free cloth and mild detergent

Media and ribbon paths cleaned from paper lint and dust

Sensors cleaned from paper lint and dust

Sign off on the cleaning procedure

Warning: This procedure requires trained personnel with PPE!

Open the printhead assembly by rotating the printhead-open lever upward

Remove the ribbon (if used) and the media

Using the swab from a Zebra Preventive Maintenance Kit, wipe along the brown strip on the printhead assembly from end to end. In place of the Preventive Maintenance Kit, you may use a clean swab dipped in 99.7% isopropyl alcohol. Allow the solvent to evaporate

While manually rotating the platen roller, clean it thoroughly with the swab. Allow the solvent to evaporate

Reload the ribbon (if used) and the media. For instructions, see Loading the Ribbon on page 64 or Loading the Media on page 35

Rotate the printhead-open lever downward until it locks the printhead in place

Close the media door. The printer is ready to operate

Turn off the printer and disconnect the AC power cord

Remove media that is loaded through the cutter module

Loosen and remove the thumbscrew and lock washer on the cutter shield

Rotate the cutter motor thumbscrew to fully expose the V-shaped cutter blade

Wipe along the upper cutting surface and the cutter blade using the swab from the Preventive Maintenance Kit or a clean swab dipped in 99.7% isopropyl alcohol

Soak a clean swab in a general-purpose, higher-viscosity silicone or PTFE oil lubricant

Apply an even layer along all exposed surfaces of both cutter blades. Remove any excess oil so that none of it comes in contact with the printhead or platen roller

Warning: This cleaning procedure requires trained personnel with PPE!

Open the printhead assembly by rotating the printhead-open lever upward

Push down the peel-off mechanism release lever to open the peel assembly

Remove any media liner to expose the pinch roller

While manually rotating the pinch roller, clean it thoroughly with the swab from the Preventive Maintenance Kit (part number 47362). In place of the Preventive Maintenance Kit, you may use a clean swab dipped in 99.7% isopropyl alcohol. Allow the solvent to evaporate

While manually rotating the platen roller, clean it thoroughly with the swab. Allow the solvent to evaporate

Use the swab to remove excess adhesive from the tear-off/peel-off bar. Allow the solvent to evaporate

Reload the media through the peel mechanism. For instructions, see Using Peel-Off Mode (with or without Liner Take-Up) on page 42

If the ribbon did not run out, cut or break the ribbon before the ribbon take-up spindle.

Turn the ribbon release knob to the left until it stops.

After the ribbon release bars have pivoted down, turn the ribbon take-up spindle one full turn to the right.

Slide the used ribbon off the ribbon take-up spindle and discard.

Sign off on the ribbon replacement