Hello MX4 thank you for your inputs, tested 77 switches we even tried knocking the body of switches to test if the mechanism inside would loose and deactivate and tested with new sets o switches, we can perform test run for a number of times before elevator going to OS for a seconds then return to normal automatically and can register car call.
We also encounter sometimes that the car is a bit higher or lower from landing door, on top floor or lowest floor.
Gap was double checked already for clearance, we will check for the crack on magnet, yes I've also read that the bistable switches are sensitive so I have ensured gap clearance from each other and railings are adjusted properly.
What I am suspecting now was the ADO Board as sometimes the 61 and 30 will not trigger and fault 152 appear, isn't 61s and 77s all go through ADO relays, we even encountered 0076 - 553 relay in door zone supervision circuit did not work, we encountered this 2 times already this morning, I think I'll have to checked also the power supply to this board as I see also the start Permit LED are dimmed.
If you can share advise or thoughts again that would be great, thanks mate.
