Adafruit thermal printer power supply with Yun

Hello, I read the Adafruit thermal printer needs an external power supply providing 5/9V up to 1,4A. Everyone says not to plug it directly to the arduino board, except if this is power supplied.

My question : the Yun doesn't have a DC/IN as other boards do. But if I plug the micro-usb pin to ac AC/DC adapter, just as an iPhone charger, will it be ok to supply power to the printer ? Won't it hurt the board ?

Thank you Elliot