1, once the device abnormalities should be carefully investigated by professional engineers to the scene, analyze the causes, find the problem to solve the problem
2, self-solve can not solve the problem, you need to immediately call the North Yu service department. By phone, Email, Fax and other means. Most of the problems can be solved by remote control.
3, telephone, Email, Fax and other methods can not be quickly troubleshooting, the customer made a written application, Beiyu company promised to send professional engineers within 24 hours on-site service.