Beacon Code Button Problems

We just recently got our airplane back from the shop after having a complete new panel installed. Part of the upgrade was an IFD540 and an AXP340. The issue that I seem to have is that every time I try to enter a 4 digit beacon code, after entering the first 3 numbers and upon entering the 4th one, the screen will revert to the last beacon code entered. It seems that the only way to get a new code in is to backspace the old one out. I know at one time after trying to get the new code in 3 or 4 times I gave up and pressed the VFR button.  I pressed it again and the code that I had trying to enter appeared.  This seems to be more prevelant when using local codebanks that the approach controls reserve for VFR flight following, (0122, 0322, etc).  It was a long series of flights from LAL to BRY with 35 kt headwinds so my memory of the events may be a little fuzzy.  Has anyone else experienced anything like this?

Kentucky Captain wrote: We just recently got our airplane back from the shop after having a complete new panel installed. Part of the upgrade was an IFD540 and an AXP340. The issue that I seem to have is that every time I try to enter a 4 digit beacon code, after entering the first 3 numbers and upon entering the 4th one, the screen will revert to the last beacon code entered. It seems that the only way to get a new code in is to backspace the old one out. I know at one time after trying to get the new code in 3 or 4 times I gave up and pressed the VFR button.  I pressed it again and the code that I had trying to enter appeared.  This seems to be more prevelant when using local codebanks that the approach controls reserve for VFR flight following, (0122, 0322, etc).  It was a long series of flights from LAL to BRY with 35 kt headwinds so my memory of the events may be a little fuzzy.  Has anyone else experienced anything like this?

Garmin transponders have the feature too.  Guess what?  I found it the same way as you, once I got my AXP340 and read the pilot guide.

Seems pretty clear that you have a hardware fault, and need a fix/exchange.

Just browsing through the forum and I realized that I never closed the loop on this issue.  Avidyne was great and replaced the unit under warranty.  I haven't had any problems since then.  I don't believe that I've ever seen a transponder as fast as this.  Within a few seconds of entering a beacon code, I'm getting a "radar contact" every time.  Lightning fast, and that's coming from 27 years as an air traffic controller in a fairly busy radar facility.  Thanks Avidyne.  Now if you can just get the issue with the IFD540 not being able to key up the pilot controlled lighting I'll be happy...for the present.