How do I clean the printhead on a Zebra GC420t to resolve printing issues?

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Grade: Education Subject: Support
How do I clean the printhead on a Zebra GC420t to resolve printing issues?
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Turn off and unplug the printer. Open the printhead. Gently clean the printhead with a lint-free cloth dampened with isopropyl alcohol (90% or higher). Avoid abrasive cleaners. Allow the printhead to dry completely before reassembling and testing. Do not touch the printhead elements directly.