E402

Pedal identification error: pedal ID are not right one or the pedal is not compatible with system.

Make sure the problem appeared from pedal or control box. Check the plug pin of pedal loose or not.
Connect pedal, supply power by 80V isolation transformer,test the voltage of foot 3 and foot2 on CN8, it is around 2.8V. 【Press pedal to the bottom the voltage if 3.5V】; Voltage of foot 1 and foot2 【ground】is 5.1V.
Test the resistance of R80 on main board: around 100 Ω; supply power by 80V isolation transformer,test the voltage of two sides: 2V.
Test the resistance of R80 on main board: 45K; supply power by 80V isolation transformer,test the voltage of two sides: 1.08V. 【Press pedal to the bottom the voltage if 2.2V】