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Identification of microcontroller

Dear specialists,

Unfortunately my Brother plotter sdx1500 is broken. Some micro chips are burned out and I can not identify them to replace. I can see only 906??8 ??T ASTP.

Sorry, here I can't add a picture.

Maybe someone knows which chip is that? Or someone has info where I can order new mother board for my Brother sdx 1500?

Thank you in advance!