Hi everyone,

I have a new JD Robot!

I'll tread lightly here because I'm in the same sort of chicken and egg situation as in this thread: https://www.ez-robot.com/Community/Forum/Thread?threadId=8137

I went to the warranty support form that requests that I provide a URL from the discussion form in order to get warranty support. When I try to submit the form, it says, " Warning: Provide the URL to the forum discussion that has helped you identify a defective part. Our customer support person is not able to assist in technical diagnostics. Once you have obtained assistance from our forum, you may provide the URL to the discussion in the above field so we may review the diagnosis to assist you effectively." Ok. So I'm posting this new discussion as requested.

I see here in the discussion forum (just above where I am typing), it says, "Note: Technical EZ-Robot questions only! If you have warranty concerns, we ask you contact EZ-Robot directly." This seems to contradict the URL requirement...but I can't submit unless I post here, so here goes:

Out of the box, one of our servos is not working properly. I have self-diagnosed the problem as an electrical engineer with a vast amount of experience with hobby servos. I build other robots and other things with servos (RC planes, etc.). One of the servos out of the box only responds at certain angular positions. For example, with no connection, if the servo is carefully/physically moved to +30-deg off of the 90-degree (zeroed) position, applying power with the controller set to all servos at 90-degrees does indeed move the servo to the 90-degree position. Removing the power and carefully/physically moving the servo to -30-degrees off center (the other direction), then again applying power to the servo with the controller at all servos 90, the servo does not move at all -- no buzzing, chatter, heat -- no nothing. This was discovered when checking the calibration of the servos. All other servos work perfectly using the same controller channel.

I've seen this behavior in servos before that have defective electronics or feedback pot. The gears seem to be fine and the motor works, uh, in one direction...

Does anyone have anything to suggest or add? I'm convinced at this point that it is a defective servo. The behavior is repeatable.

Thanks all!