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A3 Pro - Failing w 1 GPS Red LED
901 3 2018-9-29
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DougcJohn
lvl.3
Flight distance : 782169 ft
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M600 Pro A3 Pro LB2. The 1st GPS mast after startup has a Red LED on GPS. The Flight Controler/IMU and #2  IMU are Green  and Blue.
Using the DJI Go App, I can select a different Priority and the 3 IMU's rotate correctly.
As a test... I swapped the physical & connection location of GPS Mast #2 with #1 Red LED.
After restarting , the RED LED followed the #1 GPS Mast and #2 Mast connected to FC workd correctly.
I swapped #1 with #3 GPS Mast and again the RED LED followed the #1 Mast to new location and physical connect to IMU #3.
When connecting wiht DJI Asst 2, the GPS lights continue to indicate #1 GPS Mast as error, but continues to show it in location #1.
Evidently, the CAN1 connections aren't aware of the location plugged intto.... Pluged into FC or IMU3.. shows same location.
This is the area I don't see the method to "reset" to install new.

The M600 Pro is a large craft, I'd lke to avoid sending it in for Service if a repair can be performed.
I am in the process of building a new S1000 with E1200 Proplusion Kits, 17" Props, A3 Pro & LB2.
I borrowed an A3 Pro UPdated pak and swapped the #1 GPS Mast with New GPS Mast.
This caused several red lights and the IMU's all appeared not accepting the new GPS Mast.

Question: What procedure is required to replace a IMU or IMU & GPS Mast?
Do you need to Reset the Flight Controller and start from initial configuration?
Is there a "Reset" that needs to be performed before plugging in replacement IMU / GPS Mast ?

Within DJI Asst 2:
In setting Up the GPS & IMU. It's not specified what value "Y" should be or where it's being measured?

I searched every where and unable to find truble shooting, Diagnostic or Repair procedures for A3 / A3 Pro.

Any updates or procedures would be helpful.




2018-9-29
Use props
WiSi-Testpilot
lvl.4

Offline

After you have installed the compasses you should go into the garden and perform a (first) compass dance. Remove the propellers first. Then I would not swap anything.
Factory reset is dashboard -> restore.
Best regards,
Wilhelm
2018-9-30
Use props
DougcJohn
lvl.3
Flight distance : 782169 ft
Offline

WiSi-Testpilot Posted at 2018-9-30 00:15
After you have installed the compasses you should go into the garden and perform a (first) compass dance. Remove the propellers first. Then I would not swap anything.
Factory reset is dashboard -> restore.
Best regards,

Are you referring to after "replacing" one of the A3 GPS/Compass on the mast or in basic A3 Pro setup? I had no issue on setup of A3 Pro, but after 1 failed getting the new to be accepted / recognized by the A3 Pro system; the IMU that had been showing stability of Blue and Green LED became a mixture of RED LEDs. It appears it doesn't recognize the new unit but retains the old unit.

If this is normal when all IMU's and GPS/Compasses blink Red... then great to hear and I'll take her outside for calibration. It just appeared to me that it was in a state where it wouldn't calibrate.
2018-9-30
Use props
DougcJohn
lvl.3
Flight distance : 782169 ft
Offline

WiSi-Testpilot Posted at 2018-9-30 00:15
After you have installed the compasses you should go into the garden and perform a (first) compass dance. Remove the propellers first. Then I would not swap anything.
Factory reset is dashboard -> restore.
Best regards,

Hi Wilhelm,
Thank you!
Follow-up to 1st reply... assumed it would not have calibrated with all the IMU, Flight controller and GPS Compasses all erratically blinking RED and sometimes Green or Blue. Looked like system was in state of confusion and wouldn't be receptive. But amazingly it did accept a calibration and a reboot seemd to restore the LED's to all Blue / Green without #1 GPS Mask blinking Red.

On 2nd restart to verify operation, the DJIGo app was indicating failure in mismatch Firmware. Connected to DJI Asst 2, reinstalled the FW, Restated and all is Great! Good LED's, FW equal.

That saved packing this big bird up and sending DJI Techs.
I'm amazed the GPS Compass units can't be purchased separately and only DJI Service or purchasing a A3 Pro Upgrade Kit is about the only way to obtain the GPS Compass.

Good to Go!
2018-9-30
Use props
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