Society of Robots - Robot Forum

Mechanics and Construction => Mechanics and Construction => Topic started by: SeagullOne on August 30, 2008, 05:13:56 PM

Title: Servo won't move?
Post by: SeagullOne on August 30, 2008, 05:13:56 PM
Sorry, wasn't sure if this should have gone in the electronics or mechanics.

I appear to have a servo that won't budge. I don't mean plugged into electronics or anything, I mean it won't budge when I move the servo horn with my hand, in either direction. It's a Hitec 322 HD standard servo. I have four others like it and they move fine. Is it broken? Anyone know?

Thanks.

Loren
Title: Re: Servo won't move?
Post by: izua on August 30, 2008, 07:18:38 PM
The gears might have something jammed from manufacturing, a piece of plastic or so.
Try opening it and see if this is the case.
Title: Re: Servo won't move?
Post by: airman00 on August 30, 2008, 07:30:44 PM
maybe the internal potentiometer is bad, i've seen potentiometers can't move b/c of errors in manufacturing.
Title: Re: Servo won't move?
Post by: SeagullOne on August 31, 2008, 05:27:38 PM
Thanks guys. I'll probably just buy another servo...
Title: Re: Servo won't move?
Post by: MarkBrown on August 31, 2008, 07:08:07 PM
The gears might have something jammed from manufacturing, a piece of plastic or so.
Try opening it and see if this is the case.

I agree.  Even if the electronics where bad, you should still be able to move it manually.  Take it apart and check the gears.  I assume you haven't modified it yet right?  If you have, you might have glued the small gear or tightened the servos screws too hard.

Mark
Title: Re: Servo won't move?
Post by: SeagullOne on August 31, 2008, 09:35:52 PM
Nope, haven't modified it or anything. It was that way right out of the box.

I'll check the gears, see if that's the problem. Thanks!
Title: Re: Servo won't move?
Post by: MarkBrown on August 31, 2008, 09:39:09 PM
If it is broken straight out of the box, exchange it.  If it is the gears, and you don't want to exchange it, replacement gears are usually only about $4 or $5.