So the enter button on my Control Products TC-9102 worked randomly at best since day one. Not a huge issue unless you need to change a setting. I had always figured that some moisture had damaged the button and it just needed to be cleaned. Well today I decided fix the thing instead of fighting it anymore. Upon investigation I discovered that 3 out of four buttons were not even soldered to the board. Once the buttons were soldered up everything works great. So bottom line, if the buttons on your TC-9102 are not working, don't toss it; a little solder may fix it right up. Additionally it looks like one button was soldered from the top, were is I soldered the remaining buttons from the bottom side to avoid melting the plastic on the buttons.