F9 is a fault code. This will depend on the model of microwave, if it has an inverter it is more than likely a panasonic, and the board will have to come from them. This is not a job for an amateur! Very high voltage and potentialy dangerous.
tony
February 2008
I can answer this question...
how can i get a Inverter board for my microcwaves?
howtomendit.com for free repair help, information and advice.
Try fixfault.com to fix microwaves.