---
title: Sensor Connection Error - Step 1 - V4 PrimeSense Sensors
description: How to troubleshoot the Sensor Connection Error for V4 ProScanner systems.
---

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# Sensor Connection Error - Step 1 - V4 PrimeSense Sensors

## How to troubleshoot the Sensor Connection Error for V4 ProScanner systems.

Please begin by [**Power Cycling your ProScanner**](https://youtu.be/Xs8JAcXekaw).

 

Be sure to follow the instructions in the order listed, not skipping any steps. Open the ProScanner's Fit3D app and allow all four diagnostics tests to complete.

**If the Sensor Diagnostic is the only one to fail**, press Cancel Diagnostics and attempt to take a test scan to confirm if the Sensor Failure was a false positive.

 

**If the Sensor Failure is the real deal** (you couldn't perform a scan for any reason), please write down the errors to share with me and continue to these next instructions to confirm if all 3 cameras are connected.

1. Press and hold the Windows menu at the bottom left
2. This will bring up a search. Search for Device Manager, and click ok to access this menu.
3. You'll see a menu that looks like this:

4\. Find "**PrimeSense**" and expand that folder (as displayed in the red box above). If you have a scanner with three cameras, you should see three cameras listed here.

![](https://service.fit3d.com/hubfs/Primesense-png.png)

**If you only see one or two cameras,** please proceed to [**Sensor Connection Error Step 2 - all versions by clicking here**](https://youtu.be/Myazk_lANLw).

 

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