Pixhawk 6C mini - servo driving issue

ArduPlane Plane 4.5
1

Hello! First time Pixhawk user here (6C mini) , but i previously worked with many F405 boards without an issue & a Cuav V5+ . I have Ardupilot 4.5.7 firmware.

I got a 6C mini to upgrade my Heewing T2 VTOL, and just realized that it is not capable of driving the tail motors (Elevator & Rudder). These are digital metal gear, sharing the power lines and having 2 long signal wires.

However the servos work just fine on the servo tester (powered from the same rail of Pixhawk). The Pixhawk can drive any other (digital or analogue) servo on the same channel .
So i think there is an issue with that particular servo model, or with the 6c mini PWM voltage level.

Here is a short video on the bench , showing an issue that drives me crazy,

I have read that there is an option ot increase PWM signal voltage level to 5V. Do you think that might be the issue ?

Thank you,
Florin

2

I have similar issue. Does your B\E led in FMU frame blinking twice repeatedly?

3

yes they do. I meanwhile reduced the issue to a specific type of servo who does not work with 3v3 logic of the PX. Even though theoreticaly identical, the producer had different batch of servos for this plane under the same part-no.