I got to the calibrate ESC step in my KH250 build and was surprised that two of the four ESCs wou...

[G+_Steve Prior]

I got to the calibrate ESC step in my KH250 build and was surprised that two of the four ESCs would not power up the receiver when hooked directly, and both of the nonworking ESCs were on the same side of the quad.  I assumed the problem was in the power distribution board so I disconnected everything and started measuring resistance on the power distribution board - everything checked out.

 

Then I measured the resistance of the power side of the bad ESCs and got infinite resistance, then measured the working ones and got about 10k - at that moment I became convinced I got two bad ESCs.  Fortunately I kept thinking and stuck one side of my meter inside the shrink wrap and measured the resistance on each side of the ESC to the tip of the bullet connector (should be near zero) and found that two of them were infinite!

 

So the moral of the story is don't panic or jump to conclusions!  I'll replace those two bullet connectors tomorrow and will most likely be fine, but if I had stopped checking 5 minutes earlier I would have assumed two bad ESCs and got into a major hassle trying to return them and had my build on hold for a week or two.  Hopefully I'll try a first flight tomorrow.

[G+_Steve Prior]

Replaced those two bullet connectors, everything then checked out, and I had my first flights with the KH250 today.