After replacing the board you need to relearn only the first floor again then reenter the parameters for the remaining floors. You must have the car floor level at bottom landing and just step through all the floors setting them all to 0000. Then go to F7 parameters and change the values for all floors except 1st to previous value. This will work anytime a tape or selector or TC-MPI board is changed. The advantage is that it can all be done from the machine room without moving the car. The tapes magnectic signal resembles a bar code and differs throughout its length.