How do i connect my pioneer CDJ850 to my behringer DDM4000

https://elektrotanya.com/behringer_ddm4000_mixer_sch.rar/download.html

It sounds like it got blasted with ESD, see if you can get it repaired under warrenty.

I am not familiar with your unit but it sounds like the extension cord is connected to both the lights and mixer, if so use two extension cords. I have seen a lot of horror problems with undersized extension cords.

Good Luck

Try blowing out everything and check your contacts.

Just use google search or go to this link:

http://www.behringer.com/assets/DDM4000_P0167_M_EN.pdf

Behringer is stingy about schematics... however here is one for their DJX700 which MAY have a similar power supply to yours:

http://elektrotanya.com/behringer_djx700-professional_sch.pdf/download.html

Scroll down to "get manual" and click to download... IGNORE other download links.
On page 9 near the lower right corner is the simple power supply, minus the transformer but showing the rectifier diodes, filter caps, and the three terminal regulators. These regulators have a thermal shutdown feature so if they seem to run VERY hot they might cause your problem. Common things are failing electrolytic filter caps. Behringer also uses switching power supplies in some gear and I have schematics of examples of those as well... but peak in your unit and see what type supply you have.

Freeze up is usually overheating, check your heatsinks and if the compound has dried up.