Hi I have Jr Z-1 transmitter.
It was working fine and the next day it doesn't transmit anymore. I have 3 cars for that transmitter and as soon as I turn everything on the fail safe goes on. I don't think it is the module as I I put working modules in the Z-1 it still doesn't work. Everything is normal, I have power and I can scroll through the menu as normal. The cars just don't respond to it anymore. What could be wrong?

Any help would be appreciated.