Submasters, buttons and LEDs not functioning on ION XE Last updated Save as PDF Symptoms/Issue ION XE or Standard Fader Wing has one row of buttons and faders that are not functioning properly. Description/Explanation of Issue The Ribbon cable connection between the Fader Master PCB and the button/fader PCB has shifted or become loose. Fix/Solution Power down and open the console. Unplug and inspect the white ribbon cables going between the fader/button PCB and the fader master PCB. Reseat the cables, reassemble and test.