What i have
AXE CP
GY401 with the c12 ESC
dx7 with AR6000

Here are the connections:

1. BAT port - not connected
2. THR - connected to ESC/3 in 1
3. AILE - connected to Right Rear Servo
4. ELE - connected to Front Center Servo
5. RUD - Connected to Gyro
6. GER - Connected to Gyros sensitivity switch (yellow wire)
7. AUX - connected to Left Rear Servo

I connected everything up and found a thread on the forums on how to setup the dx7. I set it all up and it all looked good. Now it was time to test with the motors connected. When I turned it on the tail seemed to work fine but to main rotor was intermittent. I would give it a little throttle just to get the blades to spin and it would start and stop continuously. Can anyone help?

This has happened before, but not sure if they resolved the problem. Is your battery fully charged? What size is it?

Just off the charger lipo 11volt 940ma.

I called support and they said that the TX might not be compatible with the stock 3 in 1 but I have read many threads where people have the dx7 with the 3 in 1 installed. Do you think it is possible that there is something wrong with the 3 in 1.

You really have to look at everything, but the compatability with the DX7 is not it.
I ran mine with the 3 in 1 for months with no problems.

Yes, it could be a problem with the main's ESC on the 3 in 1.

It could be a connection problem,
or a Tx programming problem,
or a motor problem,
or ???

Do you have a DMM and any electrical troubleshooting experience?

You have to start identifying what IS good and worik from there.

Well I disconnected everything from the RX except for the 3 in 1 since the power was coming from that anyway that was all I needed to test and still no luck. Even with the throttle at zero I get a pulse of power to the main blades every second and then a second of no power and that just repeats over and over unless I put the TX into throttle hold which is set for -10%. Since I have the second ESC for the gyro I enabled the BEC on that lead and connected that lead and the 3 in 1 to the RX only and disabled the BEC on the 3 in 1 and still no luck. Since the RX was now being powered by the Gyro lead I disconnected the 3 in 1 and connected a regular server to the throttle connection and it seemed to work fine. I could even see the exponential curve that I had setup in the TX when going from 0% throttle to 100%. I even tried using a brand new 3 in 1 that I has purchases as a spare and no luck with that either.

I believe you when you say that you and others had it working but maybe something has changed with the 3 in 1 unit or the RX/TX. I really don’t know. I might just use this as a reason to get with a brushless mail motor which would require me to get a separate ESC anyway. I would still rather get this working so I anyone can think of something else I could try please let me know.