Hi Joe123s,
If you have the older blue lettered 4VF or a 4NBF, the first run of 6EXA's when used as master will make your servos chatter. Since the first run of these 6EXA's there have been no problems with older radios. You will see an FAQ on our website regarding an update that we do at no charge on first run 6EXA's for this problem.
If you are getting no repsonse at all, I would suspect either the trainer switch on the 6EXA or the trainer cord itself as being the problem.
I hope you find this information helpful. You can also reach our Futaba support technical team at 217-398-8970, or via fax at 217-398-7721.
Sincerely,
Krysta
Lead Futaba Customer Service and Programming Technician
Also you may want to check our Website at (
http://www.futaba-rc.com)