Movie: How to set the Head Unit
*The video clip is being streamed from YouTube.
Place the product on an Electrostatic Discharge (ESD) grounding mat or use anti-static gloves, otherwise this product or its accessories may get damaged or destroyed.
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Make sure you disconnect the printer from the AC power outlet.
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Pull up the release levers on both sides of the printer to unlock the Roll Compartment Cover, and then open the cover.
![](/g/b/img/faqend/faqp00100448_000/hk/en/2212758/HU_PR_step2.gif)
Do not directly touch the Tear Bar with your hands (except for TD-4420DN(FC)/4550DNWB(FC)). Doing so may result in injury.
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Push up the lever on the inside of the cover.
![](/g/b/img/faqend/faqp00100448_000/hk/en/2212759/HU_step3.gif)
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While holding the cable, remove the connector from the head unit.
![](/g/b/img/faqend/faqp00100448_000/hk/en/2212760/HU_step4.gif)
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Connect the connector to the new head unit.
![](/g/b/img/faqend/faqp00100448_000/hk/en/2212761/HU_step5.gif)
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Affix the head unit to the hubs on both sides.
![](/g/b/img/faqend/faqp00100448_000/hk/en/2212762/HU_step6.gif)
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Holding the cover, lift up the head unit by pressing on its central part until it makes a clicking sound.
![](/g/b/img/faqend/faqp00100448_000/hk/en/2212763/HU_step7.gif)
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Close the Roll Compartment Cover until it locks into place.