Hi Gents,
I have noticed that the two Phantom 4's that I have with yaw issues of pointing off center have the following characteristics when compared to other perfectly working Phantom 4 camera gimbals:
When the P4 not powered, with the bad yaw center is leaned forward on its arms, the gimbal leans the yaw to either the left or right.
When the P4 not powered, with the good yaw center is leaned forward on its arms, the gimbal yaw remains centered.
With the P4's not powered, with the bad centering gimbals when the yaw is pushed left or right tend to stay left or right.
With the P4's not powered with the good centering gimbals when the yaw is pushed left or right tend to bounce to the center position. It almost seems like it is being held there by some magnetic field.
In my attempts to fix the bad gimbal centering, I have done:
1. The IMU calibration then gimbal calibration.
2. The "special" gimbal calibration when the P4 is stood on the back motors.
3. Repeated the gimbal calibration with FPV and Follow modes selected.
4. Manually repeated the power-off yaw twist to the stops, opposite of the off-center.
5. Replaced the yaw gimbal motor.
6. Swapped bad centering yaw, pitch, roll controller pcbs with known good ones.
In each case above the gimbals still had bad centering. All were 20 to 30 degrees off-center left and right. The yaw will still work in a limited way when in flight but the view is offset and annoying. The pitch and roll work normally in the gimbals I have with the centering issue. All have the latest firmware updates installed.
I will try the motor housing swap, but since I bought these used with this poor centering problem it could be that the yaw motors were already replaced.
Thought:
If it is a magnetized area of the motor housing as is suggested in this thread that the sensor is calibrated for at the factory, then there must be a way of magnetizing an area of a new motor housing? Perhaps by gluing a tiny molybdenum magnet in the best location on the poorly centering yaw motor housing would also work?
Note: In the P3 and Inspire gimbals there are definite magnets that can be reoriented to fix gimbals with poor centering.
Cheers to those who keep trying to fix this issue!
Jim