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I have 2 ABB 2600 robots. While one of them is welding very well, I cannot do pulsed welding with the other one. I am getting the LHSB error. I replaced all the LHSB cables and all other cables between the working robot and the non-working robot, and I also changed the motherboard. The other robot still cannot do pulsed welding. I also changed the motherboard, there was no change in the one that used to do the welding well, it still works fine, the other one still can't. I did not only change the location of the LHSB power inputs at the back of the machine. The seller says that the Fronius cables need to be changed. I changed the said cables and even the location of the RCU panels, but I still cannot weld, please help.