> For the complete documentation index, see [llms.txt](https://www.boxhero.io/docs/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://www.boxhero.io/docs/resources/guides/zebra-zd421t.md).

# ZEBRA ZD421T

***

{% hint style="success" %}
Complete the **printer** **setup** and **print** **configuration** in order.
{% endhint %}

## I. Printer Setup

{% stepper %}
{% step %}
If you purchased the **Bluetooth or Wi-Fi module** for mobile printing, open the cap on the bottom of the printer and install the module.\
(Skip this step if you do not have a module.)

<figure><img src="/files/aKwp2ck9mTQWPqkgrZ8C" alt=""><figcaption></figcaption></figure>

{% endstep %}

{% step %}
Pull the **yellow buttons** on both sides of the printer to open the cover.

<figure><img src="/files/shvLai015gGjHBAF2opn" alt=""><figcaption></figcaption></figure>

{% endstep %}

{% step %}
Place the ribbon with the **outer side facing down** and attach it to the holder.

<figure><img src="/files/gkYEtmnvbvYieE5nxGaf" alt=""><figcaption></figcaption></figure>

{% endstep %}

{% step %}
Install the attached **ribbon** into the printer.

<figure><img src="/files/vAG5FlTTw1nSxF7LXqyy" alt=""><figcaption></figcaption></figure>

{% endstep %}

{% step %}
Install the **ribbon core** into the printer.

<figure><img src="/files/Tsp2XTcK1ke9iYHf7u6D" alt=""><figcaption></figcaption></figure>

{% endstep %}

{% step %}
After securing the ribbon with tape, lightly wind it to ensure it lays flat.

<figure><img src="/files/vAG5FlTTw1nSxF7LXqyy" alt=""><figcaption></figcaption></figure>

{% embed url="<https://customer-0jrbilsa8yt3k758.cloudflarestream.com/ec6af04a388a4dcc865bb7b0965c84bd/iframe?autoplay=true&controls=false&letterboxColor=transparent&loop=true&muted=true&poster=https://customer-0jrbilsa8yt3k758.cloudflarestream.com/ec6af04a388a4dcc865bb7b0965c84bd/thumbnails/thumbnail.jpg?height=1080&preload=true>" %}

{% endstep %}

{% step %}
Place the **label** **paper** between the media holders.

<figure><img src="/files/czJ1twg13mnxWlrWNPZn" alt=""><figcaption></figcaption></figure>

{% endstep %}

{% step %}
Close the printer cover and connect the **power** **cable**.

<figure><img src="/files/W7EOkHJayJMzQ20iUqkV" alt=""><figcaption></figcaption></figure>

{% endstep %}

{% step %}
Press the power button and wait for the status LED to turn green. Then press the **FEED button** to check if the paper comes out properly.

<figure><img src="/files/17Sg4hsMz19f3yVKXRDE" alt=""><figcaption></figcaption></figure>

{% endstep %}
{% endstepper %}

***

## II. Print Configuration

Once printer setup is complete, select your preferred printing method and continue to the next step.

{% content-ref url="/pages/sfVSUjgzmGI4QWDoNYCs" %}
[Desktop Printing](/docs/resources/guides/zebra-zd421t/desktop-printing.md)
{% endcontent-ref %}

{% content-ref url="/pages/sfvpGP25duYunWnJAJca" %}
[Mobile Printing](/docs/resources/guides/zebra-zd421t/mobile-printing.md)
{% endcontent-ref %}