Can You Troubleshoot #6 - CYT Why Throttle Doesn't Work but Pitch And Roll Do?

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The "CYT" series invites you to analyze an RC flight problem. After a bit, the answer, and correct analysis is posted.
In this case, the the quadcopter arms, but motors do not spin and throttle does not have any effect. Oddly, the motors do respond to pitch and roll!
THE ANSWER IS POSTED HERE:
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