GNS 430 not working properly

[AviatorMan 253]

Hi

 

I just purchased this beautiful aircraft in the ongoing sale. I am having a problem with the GNS 430: the inner/outer knobs do not seem to work. I try to turn them to change pages and nothing happens. The  Direct To button seems to work; however, after I get the Direct To screen and attempt to dial in the airport code - using the inner/outer knobs - nothing happens. Anyone else having this problem? Any suggestions how to correct it?

 

Thanks

[Bert Pieke 7,584]

You do not happen to have either the RXP GNS430 or the Flight1 GTN650, do you?

 

Either one would make a terrific addition to this airplane..

 

Sorry, I have replaced the original Carenado GNS, so cannot answer the question.. do the knobs not work in the popup either?