As the first figure shows, please choose the servo with the longest axis. Please pay special care in each servo installation because servo can only rotate 180 degrees instead of 360 degrees. Necessary screws:
1) Why does the LED on the joystick board flash? A) The LED just lights up normally. It flashes when the board reboots. The reason is that there is too much current on the board. It may cause the servo angle to get out of range, as the screw is driven too tight.
B) Solution: Loosen the screws in each joint. Disconnect all the servo cables and reconnect them one by one. Please also check to see if you are following this manual when assembling the servos.
For any problem, please email me at ted99 at gmail.com or add me as friend in FB. (Ted Lien)