# Z-min Switch Replacement

{% hint style="warning" %}
**Safety first!** Before starting any repair, take a moment to review the [safety information in your user manual.](https://docs.voltera.io/docs/v-one/downloads/user-manuals) An online version of the guidelines can also be found [here.](https://docs.voltera.io/docs/v-one/getting-started/hello-world-project/1.-safety-guidelines)
{% endhint %}

***

## Before you begin

This guide will show you how to access and replace the Z-min switch on the V-One. Before beginning this guide you should have been in contact with our support team.

As you work through this guide please reach out to our email <support@voltera.io> or through the chat if you run into any issues or have any questions. We are more than happy to assist you virtually with this repair.&#x20;

{% hint style="success" %}
**When in doubt, reach out!**
{% endhint %}

#### Estimated Repair Time:

* 15 minutes

#### Tools you will need:

* 2.5mm Hex Key (Allen Key)

#### Parts you have received from Voltera:

* Z-min limit switch PCB

## Replace the Z-min switch PCB

{% stepper %}
{% step %}

### Flip the V-One

Unplug the V-One from power and carefully flip it upside down ensuring the carriage and bridge are well supported while flipping so they don’t slide around.

<figure><img src="https://lh7-rt.googleusercontent.com/slidesz/AGV_vUdAoTeyM0c3gH_1TSY478vMTB8mRM1wcnRxuLNMtIyP61ALUNAcMdiMfpDeaPzbLopmI7IjCSgwpaWkWoN3NmgAuS4foMmbhAyBk2nKr1C8ylHULjtrVQOgrqnHc141Ca-f-CGNoz_zypDDKfrkZ0GWgZDacfbS=s2048?key=BzAeVvFqpBeZ5hgTgpIyeBb2" alt="" width="375"><figcaption></figcaption></figure>
{% endstep %}

{% step %}

### Remove the Base Cover

Undo the 4 hex screws from the base using a 2.5 mm hex key and remove the base cover.

<div><figure><img src="https://lh7-rt.googleusercontent.com/slidesz/AGV_vUdSeVsSgW-Ert6PBWBtow9wSE_cDFsX6rO42AgFOCyph0JAMXxmqBYk0zt8ZO8RtGq_cPcV-9JNN_IjjyG2izxAMq2nAHBKLEqLhkJXIBdm5gRYaht2LgGbgPBjafkwdGsFTbtDfq_MaeAXxGBXOiA4fd-Qpf0=s2048?key=BzAeVvFqpBeZ5hgTgpIyeBb2" alt="" width="375"><figcaption></figcaption></figure> <figure><img src="https://lh7-rt.googleusercontent.com/slidesz/AGV_vUfAfjlF84NI7B-kkpeNKc2imWeWj-N4jFTv7hNd45oNP2HdiFsCAuDQIIHzinxF81yYG5r3krlZvRhzLz7BerEZF0zwZGV95srLi5OPKWYzgqxnyCVbyaVVDSuvlp_qzt2QX1eMS_eCZUwxCaN-q32O6kkrIjhZ=s2048?key=BzAeVvFqpBeZ5hgTgpIyeBb2" alt="" width="375"><figcaption></figcaption></figure></div>
{% endstep %}

{% step %}

### Locate the Z-min switch PCB

In this orientation, you'll find the Z-min switch PCB in the bottom left corner of the main control board.

<figure><img src="/files/JF70MnJitR8vFlCD6z8n" alt="" width="375"><figcaption></figcaption></figure>
{% endstep %}

{% step %}

### Replace Z-min switch PCB

Using a 2.5mm hex key, unscrew the PCB from the threaded spacers. If your unit had thin Kapton washers they can be
&#x20;disposed of as they’re not longer needed with the replacement PCBs. Then install the new Z-min switch PCB with the same screws.

<figure><img src="/files/7W73vw8wZEqEUAn1voPx" alt="" width="375"><figcaption></figcaption></figure>
{% endstep %}

{% step %}

### Close up the V-One

Put the base cover back on with all 4 screws. Be carful to support the bridge and carriage while turning the V-One back right-side up.
{% endstep %}

{% step %}

### Test the new switch

Plug your V-One back into power and connect the USB to your computer. Power on the V-One and open the software. Once the software has loaded, open the console using the \~ key or by pressing alt + c and enter the command `M601 S1` . This will let the V-One know it has a new switch.

<figure><img src="/files/qiU3kQEIvRnBSrSLSz9u" alt="" width="335"><figcaption></figcaption></figure>

Reboot the V-One for the switch change to take effect. You can leave the console and software open while rebooting. Once the printer is connected again, manually test the Z-min switch by pressing it with your finger or a pen.

<figure><img src="/files/YFUCJP45anEiStLCrLpy" alt=""><figcaption></figcaption></figure>

In the console you should see the z-min switch show as **TRIGGERED** when pressed and **open** when released.

<figure><img src="/files/txXURKNC1JCQ0viLF02H" alt="" width="339"><figcaption></figcaption></figure>
{% endstep %}
{% endstepper %}

## Repair Complete! <a href="#test-complete" id="test-complete"></a>

Congratulations, you have successfully swapped the Z-min switch on your V-One!

Please reach back out to our support team through email (<support@voltera.io>) or the chat to let them know everything went well or share any photos, details, and feedback.


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