I have a customer with a bad engine board (the board that I thought was the main board because it has the eeprom on it). Their machine is down and ive ordered a new board but with a 2 week turnaround (ugh). I had a working board from another machine that I brought over to hopefully get them up and running in the mean time. When I put it in the machine it gave me the typical mis match error code that I know can be matched up with I believe simulation 004. The problem is its not allowing me to get into service mode to do that. I even tried switching eeproms. Unfortunately the problem on the old/original board is in the eeprom itself.

what im wondering is their certain information on these eeproms that are only allowed to be written once through the machine and it can only be done on a new board (ie code number information to match board to machine) and service mode access.

Unfortunately we do not have the means or the equipment to rewrite eeproms.