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Repairing or modifying your drone? Wonder what's inside? Read this.

HOTAS

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From replacing internal batteries, to coating the boards and making other modifications, it is wise to first gather as much technical data as possible. Before you remove the enclosure screws and possibly disturb heat paste, wiring, or other structures.
I always start at the FCC ID search page. Most people have never heard f this.
There you can find all of the detailed FCC filings the manufacturer had to make to obtain approval and pictures of a complete teardown.
Technical descriptions, internal photographs, antenna placement and orientation, compliance test results, are all there (usually).

For example, here is the link to the filings for my EVO 1 controller and the copter:

Every RF and possible interference generating device must make such filings and display its FCC ID number.
Find your device here and learn a thing or two about it. You might just get an idea or two. Besides, you pay for all this data collection.

Best wishes to the group,
 
Technical Data is the backbone of aircraft maintenance.

Thank you for sharing.
 
Thanks for sharing those links. It is an interesting read. It also confirms the suspicion of the EVO containing 900 MHz radios in addition to the 2.4 GHz radios. I cannot find a way to select and use the 900 MHz radios even though the description says it is user selectable. I also have never found a way to program to two buttons under the controller for user selected special functions even though the descriptions in the documents submitted to the FCC say they are user programable through the mobile application.
 
Thanks for sharing those links. It is an interesting read. It also confirms the suspicion of the EVO containing 900 MHz radios in addition to the 2.4 GHz radios. I cannot find a way to select and use the 900 MHz radios even though the description says it is user selectable. I also have never found a way to program to two buttons under the controller for user selected special functions even though the descriptions in the documents submitted to the FCC say they are user programable through the mobile application.
Other forum remarks indicate the 900MHz capability was never active in the production models. But they are certainly there. The BIN files are compressed (very often with PK Zip, which can be spotted in the file with a hex editor such as HXD at embedded file headers which begin with PK). If you unzip the BIN files, the output is a list of contents which include code and more files, many also compressed. So, if you run a BIN file through, say, 7 Zip or PKUnZip, it will extract these files for you. Do the same to those extracted files, and in most firmware EVO1 BIN upgrades you will find an AT900 file that deals with the status of the aircraft 900MHz subassembly, and a GT900 file that works on the controller's.
If you can edit and compile code, you can fool with those files, although be warned that FCC rules and the license agreement prohibit such activity. Decompiling code almost certainly does too. I look inside to see to the file list level only to witness the genius of the guys who do this work
I cannot code my way out of a wet paper bag. So I don't fool with that stuff. But it is fun peeking under the skirts of the BIN files and others.
You may find some files are password protected in these EVO BINs. At that time, when you are confronted with a password challenge popup, you may comprehend why the empty file qiangzi_shengji when included in a forced downgrade file list with the downgrade BIN, file helps force upgrades
 
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Wow! Thanks for posting this, hope to find out why my EVO2 640T V2 will not communicate after 15 min immersion @6" of water due to hi temp battery failure dissasembled drone and elctronic components were vacum bagged w dissecant paks for about 8 weeks then reassembled. the Drone powered up normally with all the correct light sequences, but is unable to talk to smart controller.
 
Wow! Thanks for posting this, hope to find out why my EVO2 640T V2 will not communicate after 15 min immersion @6" of water due to hi temp battery failure dissasembled drone and elctronic components were vacum bagged w dissecant paks for about 8 weeks then reassembled. the Drone powered up normally with all the correct light sequences, but is unable to talk to smart controller.
Well done. The antennas are down inside the front leg on EVO1. Maybe same for EVO2. I wonder if trapped water dawdled there and corroded the circuit card traces. Just a guess
 
Well done. The antennas are down inside the front leg on EVO1. Maybe same for EVO2. I wonder if trapped water dawdled there and corroded the circuit card traces. Just a guess
ill look, havent checked out the legs been trying to get the site to work with grantee code and product code

 
@ Hotas,

so what am i doing wrong on this FCC website? im trying to find pictures and schematics for the circuit board for my EVO2 640T V2 sn# (HB29222913740) so i can repair this drone or replace the comms circut board. any help would be appreciated, if your too busy no worries either,

thanks JM
 

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