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Troubleshooting CPU board on a 400


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#26 johndias OFFLINE  

johndias

    Space Invader

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Posted Mon Jun 18, 2018 10:11 PM

Well, I've replaced the cap and broke the pot down and cleaned it with alcohol (it was just a little dirty).  I tested the pot and only got 462k ohm.  The result is the same, around +5.7 on the pot output.

 

I bought another 400 from ebay and when it comes in I'll try out the CPU board to see what I can do.

 

Very frustrating!  But, thanks everyone for the help and instruction.



#27 johndias OFFLINE  

johndias

    Space Invader

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  • 22 posts

Posted Fri Jun 22, 2018 11:08 AM

Success!

Well, kind of. I bought a non-working 400 from ebay (which turned out to be working) and swapped the CPU board... color is fine. I guess the pot was the bad part? I will fiddle with it more to try and narrow it down but for now, my UAV is looking good!

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