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5. Check that the right and left landing gear rest at the same
tilt angle.
IV. Checking the Motors
1. Detach the propellers and start the motors. Carefully
examine the edges of each rotor and confirm that it is
perfectly centered on its motor. Check for any abnormal
or excessive vibration. Listen carefully for any abnormal
noise, which may be a sign that the bearings are worn. If
any problems are detected, contact DJI Support to order
replacement motors.
V. Checking the Propellers
1. Check the propellers. If there is any bending, breakage or
cracking on a propeller, do not use it. Replace worn-out
propellers and propeller bases promptly.
2. Check that when you attach each propeller, the propeller
locks (clicks) into place correctly. For each propeller, use
one hand to prevent the motor rotor from rotating and use
your other hand to try to rotate the propeller. If the propeller
rotates, the propeller base is loose and needs replacing.
3. Attach the propellers to the motors, place the aircraft on
the ground and power it on. Stand 3.3 ft (1 m) away from
the aircraft and observe the rotating propellers. If you can
see two distinct propeller outline layers, when looking
at a spinning propeller from the side, that propeller is
damaged and should not be used.
VI. Checking the Flight Control System
1. In the DJI GO 4 app, review the IMU bias and compass
interference readings. Even if the IMU biases are below the
warning thresholds, an IMU calibration can be performed
to remove small biases and improve Flight Control System
performance. The IMU calibration procedure involves
holding the aircraft in five different positions. In each
position, the aircraft must be held very stably, otherwise the
calibration may be inaccurate. The Carrying Case can be
used to support the aircraft in positions that require support.
Perform a compass calibration if necessary.
2. The ight control module fan is located at the bottom of the
flight control module, just above the Gimbal Connector.
Power on the aircraft and listen for any abnormal noise
or vibration from the fan. If any irregularity is detected,
contact DJI Support.
3. Ensure that there are no obstacles on or around the
GPS module. Remove any obstacles (such as tape with
conductive material) that might affect or block the signal.
VII. Checking the Control and Video Transmission System
1. Make sure the aircraft antennas located on the outside of the
four landing gear feet are not covered with stickers or tape.
2. Check the remote controller antennas for damage.
3. Check the remote controller neck strap for damage or
wear and replace if necessary.
VIII. Checking the Gimbal and Camera
1. The Gimbal Connector is a particularly vulnerable
component. If the gimbal fails to initialize when turned on,
fails to work after initialization, or fails to transmit video to
the app (while OSD data is displayed), check the metal
contacts on the two halves of the gimbal connector. If
there is any dirt, rub the contacts clean with an eraser. If
any contact is scratched or oxidized, contact DJI Support
to arrange repair/replacement of the Gimbal Connector.
2. If the gimbal is performing stably during normal operation,
there is no need to check it. If its performance has
deteriorated, contact DJI Support to arrange repair.
3. Check the camera, especially the lens. If moisture ingress
has occurred, use desiccant or a moisture-absorbing dry
box to remove the moisture.
4. The Gimbal Connector’s rubber damping balls are
consumable items. It is recommended that they are
replaced after 120 ights or 40 ight hours and they also
need to be replaced in the following circumstances:
A ball has been pierced and the white damping grease
has leaked out.
A ball does not return to a spherical shape when
uninstalled.
The rubber has aged and a ball has lost elasticity.
A ball was subjected to excessive forces during a crash
or other incident.
IX. Checking the Vision System
1. Check the camera lens. If any dirt or residue is detected,
gently clean the lens.
2. Check for and remove objects that might block the sensors.
3. Ensure that the Upward Infrared Sensors are securely
installed on the aircraft and are not blocked by stickers or
tape.
4. Detach the propellers and turn on the aircraft. Hold the
aircraft 1 to 2 m above a surface with rich patterns, under
good lighting conditions. Change the Flight Mode switch to
P-mode on the controller and check the DJI GO 4 app. If
the app displays an altitude value and indicates that P-OPTI
mode is active, the Vision System should function normally.
5. If a Vision System abnormality is displayed in the app,
connect to DJI Assistant 2 and recalibrate the Vision System.
After-Sales Information
Visit the following pages to learn more about after-sales service
policies, repair services and support:
After-sales Service Policies: http://www.dji.com/service/policy
Paid Repair Service: http://www.dji.com/service/repair
DJI Support: http://www.dji.com/support