hi i change my RouterBoard i use (RB751) RouterBoard, and i have several Print that work with wireless but after i change my routerboard internet work but local network not work, i change Printer ip but also not work can you help me to fix it

You'll most certainly need to send us your configuration if you want help troubleshooting.

Sounds like you replaced the board. Did you reprogram the new one?

It almost sounds like you have an issue with the bridge. I would make sure you've got one and it incorporates the wlan and appropriate eth ports.

-Mac