Channel setting.
Setting up an I gyro SAT all servos stopped working.
Searching all servo and function inputs did not solve the problem.
Switching to the Reaction test model all was working normally.
Going back to the test receiver, a 9, I eventually found the problem. On the TELEMETRY settings menu ( not the general settings menu)
I found that I had set the A output to channel 9 thinking this was for the A out put setting on the gyro, WRONG ! A search of the manual makes no reference to this, as far as I can see.
This had thrown out all the channel/ receiver plug assignment, ie plug 1 started at ch9 !
Resetting the A output to channel 1 ( the original setting) brought everything back to normal.) and the gyro works normally.
Perhaps a bit dumb of me, but perhaps it may save you guys some time by avoiding a similar mistake.