[frigoteknika]

short description of our problem.
We have 2 punch machine Murata Wiedeman Centrum 3000Q with Fanuc control OP-B.
Our FANUC OP (model B) stopped working: the screen is blank and there is no diagnostic whatsoever.
(When switching off - the CRT flashes a little, so we can see that it was a kind working but did not have a signal)

On motherboard No A16B-1010-210 there are 3 LEDs: SI SO and WDA (red greed red). Only SI(red) is On. SO and WDA are Off.
The power supply is Ok - we checked the voltages.

We have two same machines and we replace a motherboard from one machine to another machine. Now the both machine not work, and have same symptoms.

before the replacment off the board the bords and the machine was ok

Any hint how to trace the problem will be greatly appreciated.

With kindest regards

Besir Izairi