Good evening, and thank you for your attention. We currently have a forklift with the active code 3501.1, and according to the description in the message/error table, the AC-3 Power Control interface card needs to be replaced.

We have removed and inspected the controller's PCBs, so far finding two damaged components: two integrated circuits and a blown 10-amp fuse (position 7F3).

We have identified one of the integrated circuits as the ADUM1286 (Dual-Channel Digital Isolator). The other one is unrecognizable due to being burned; we can only determine that it is from the brand LT (Linear Technology). Both are connected through pins 6 and 7 of each IC, respectively.

We were informed that the issue originated after external lights were connected to the controller's output (+UB) in order to have control over the lighting after turning the forklift's ignition key.

Since I cannot share an image or indicate the position of the integrated circuit because it is not labeled on the PCB, it is located on the second board near the +UB and +UB(B) input.

I appreciate the help provided in advance.