AK28 HD/HD+ User Manual V1.1
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2.6 Transmitter LED Indicator Definitions
The LED indicator on top of the touchscreen has three colors and different
frequencies to indicate AK28 HD/HD+ transmitter’s different working status.
Solid Green: Good communication.
Green Blinks: Blinking frequency indicates AK28 HD/HD+ transmitter’s RF signal
strength. The faster it blinks, the worse the signal is.
Slow Red Blinks: Transmitter firmware does not match.
Fast Red Blinks: Transmitter is linking/binding with receiver.
Triple Red Blinks: RF initialization failed.
Four Red Blinks: Joysticks require calibration.
Solid Yellow: No communication between transmitter and receiver.
Triple Yellow Blinks: Video transmission abnormal.
Yellow Blinks: System voltage abnormal.
Fast Red-Green-Yellow Blinks: Upgrading mode.
Red-Green-Yellow Blinks in every 5 seconds: Receiver under wireless upgrading.