This page lists all the support services for 4QD motor controllers
We have some hints and tips for troubleshooting on this page.
If you need to get something repaired then details are on this page.
Our knowledgebase is on this page, it has a lot of general technical background information as well as articles and diagrams relevant to our current and older products.
If you don’t know what model controller you have, all our circuit boards have a number printed on them that starts with 30-xx. This full list of PCB numbers should help you identify the model.
We have a glossary where the technical terms are explained.