I had some issues programming some servos which led me to think my TX neutral points might be a little out.

I reset all TX trims, ATV, mixes etc and measured the pulse coming out of a couple of different RX.

With my TX sticks at neutral, I should see pulse widths of ~1500us.

However, I find my elevator neutral is 1550us and Aileron is 1520us.

As this is consisant and stable I'm assuming my TX pots are ok and that I might just need to calibrate the TX.

I recall from somewhere that a 9Zap reset/calibration process could be initiated by shorting two connections accessible through the battery compartment.

Any ideas where these pins are?

Futaba's centering is a nominal 1510 uS.

Bax,
I have checked my 9C and find that the center on the ailerons is 1530. Is that an indication that the centering has drifted and the radio needs to be re-calibrated. Or is this within a margin of error and I need not worry about it?
Paul

Normally, you wouldn't worry about it. We usually only do a calibration if pots are replaced or if something is far-enough off that it affects the transmitter's operation. Calibration resets the entire transmitter, including erasing everything that's in its memory. If you're not having any operational problems, we'd not worry about it at all.

Thanks for the reply but I'm still interested in knowing where the magical contacts are I mention in my first post.