# Troubleshooting

The EPOC Flex is designed for expert users already comfortable with setup and use of EEG cap systems. Below is some easy troubleshooting steps we recommend following but for any further help please contact support via email or online chat. 

### Error: Unable to get CQ on any channel

This could be due to not having plugged in the electrode trees into the cap please follow the steps outlined below. Or the references are not connected to the body please check the contact for both DRL and CMS.

<div align="center"><img src="/files/-LrCOmInWCVpVu2C8GEH" alt="Plugging the cables"></div>

### Error: Channel is always black

Please contact support and provide us with pictures of the electrode tree connectors, because the headsets are assembled by hand it is possible for mistakes to be made from time to time.&#x20;


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