Hello,
i have this controller board for a medical chair wich i have to test. Unfortunately i dont have any documentation or the chair itself.
As far as i know this board controls some motors via relays to move the chair up, down and in some other directions.
On first inspection there was some arcing on the 230V side and some dead capacitors due to age. easy fix.
Now i want to test this board but i dont know what it does.. so i revese engineered it and drew a schematic:
Im not good with analog circuits like this one and i cannot figure out the function. Can anyone tell me how this thing works?
Thank you!