GLX-PCB-RITE Main Circuit Board Note: When replacing the control board, be sure to take photos to record the jumper connections on the old control board. This is extremely important!!! Failure to do so may result in the circuit board being damaged!!! 1. When replacing the new control board, be sure to take photos to record the jumper connections on the old control board. This is very, very, very important!!! 2. Before installation, be sure to remove the jumpers from the old control board and install them on the new control board. 3. Before installation, please confirm that the voltage of the control board is 110V or 220V. lf the circuit board is installed incorrectly, it will burn out and cannot be powered on. 4. lf the jumpers are lost, don't worry. We provide 2 spare jumpers for each seller.