> For the complete documentation index, see [llms.txt](https://emotiv.gitbook.io/epoc-user-manual/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://emotiv.gitbook.io/epoc-user-manual/troubleshooting/electrode_assembly.md).

# Electrode Assembly

## Broken Sensor Lock <a href="#broken-sensor-lock" id="broken-sensor-lock"></a>

Occasionally, due to wear and tear, the quarter turn locking mechanism holds the sensor onto the headset breaks. This makes it impossible for the sensors to stay in place but it is possible to repair. Please contact [online support](https://www.google.com/url?q=https://www.emotiv.com/contact-support/\&sa=D\&ust=1517545046757000\&usg=AFQjCNE4vfb4M1c6JM3oCVnbLcxsqJncsw) for assistance.