Failsafe Mode; H501A Troubleshooting - UBSAN H501A User Manual

9 Failsafe mode

The quadcopter will enter Failsafe mode when the connection between the transmitter is lost
or when the power is low. The flight control system will control the quadcopter to return to the
Home Point and land automatically. The Failsafe mode helps to avoid injuries or damages.
Conditions that will activate Failsafe mode
(1) Transmitter is powered off.
(2) The flight distance is over the signal transmission range of the transmitter.
(3) The signal of the transmitter was interrupted by some other strong electronic interference.
Home Point is recorded when the quadcopter receives the 6th satellite while the motors
are armed.
To ensure that the X4 can return safely to its Home Point, fly the X4 in a safe to fly area.
If there are GPS satellites drops below 6 or less for more than 20 seconds while the X4
is returning home, the X4 will descend automatically.
The X4 cannot avoid obstacles automatically while in Failsafe mode.
If the power is low, please land the quadcopter in case of any damages.

H501A TROUBLESHOOTING

1. Transmitter and X4 do not pair
1) Check if the transmitter and the X4 are both power on or not.
2) Re-pair by the following steps 1 Power off the transmitter.
2 Press the camera function key and power on the transmitter till "Bing to plane" displays
on the LCD screen.
3 Face the X4's bottom to the transmitter's LCD screen very closely and power on the X4,
hold 5 seconds till the pair is finished.
2. Cannot Unlock the propellers
1) Make sure the X4 is finished the compass calibration.
2) Make sure the Home switch is in the downward position.
3) Make sure the sticks are all in the center positions.
3. Cannot Search GPS Signals
Make sure not fly indoor or fly surround by buildings.
Make sure fly in outdoor and in an open field and void of obstacles, tall building or steel
structures.
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