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 Rank: Beginner Level 1 Groups: Registered
Joined: 28/03/2017 Posts: 5 Points: 15 Location: NYC
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Finished my Robi assembly and discovered an issue where the right hip and the rest of the servos on the right leg move intermittently. Like the rest of the body moves fine, but the right leg skips and jumps in its movements or sometimes it stops moving.
I'm wondering what type of problem could this be?
Pinched servo wire between right hip to control board? Faulty servo?
Also, side thing I noticed: If I move Robi's left arm on my own (while Robi is off), noise/crackles appear in Robi's speaker. Is this something I should be worried about?
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 Rank: Super-Elite      Groups: Registered
Joined: 17/12/2013 Posts: 3,982 Points: 11,974 Location: NY, USA
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Hi DMR,
welcome to the forum.I am forum support for USA. I had a similar issue and it was a pinched servo wire in the leg.I would start by checking the assembly of the leg in question
Carl
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Hi DMR Welcome to the forum, I presume the leg test when they were firsT joined together went without any fuss so I suspect the cable from the leg to the board may have come loose from its seating or has rubbed somewhere. So check your connections and the cables. As for the crackling there is an arm servo cable that runs through the back of the speaker box on Robi so I think this may be frayed and is contacting the speaker this should be looked at before you get a fried speaker or servo. Andy Current builds:-C57,Zero, Lamborghini Countach, Caldercraft HMS Agamemnon,Robi,R2-D2, MFH Cobra .
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Rank: Beginner Level 1 Groups: Registered
Joined: 28/03/2017 Posts: 5 Points: 15 Location: NYC
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Thank you for your replies.
The issue wasn't present during the standalone leg test (AFAIK). It could have been, but it's so intermittent that I might have missed it.
So I started out with the assumption that the top level servo or its input wire (from the control board) must be at fault because the whole leg was going limp. So I bypassed the hip servo (by wiring up the next servo to the control board) and the issue still remains.
Could a pinch in the foot take out the whole limb? I hadn't considered that. I only considered that a pinch affects all subsequent servos which is why I placed the blame initially on the hip servo.
So I'm going down the limb testing servos individually now. I'll report my results later.
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Rank: Beginner Level 1 Groups: Registered
Joined: 28/03/2017 Posts: 5 Points: 15 Location: NYC
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So turned out to be the servo cable between the right hip and right thigh.
After replacing said cable, the right leg is now working without a problem.
Though, I'm pretty livid about this but, after a few hours of him moving, his right arm stopped working. To fix it, I have to take pretty much a ton of stuff apart. I'm tempted to just get him an arm cast and call it a day instead.
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Rank: Beginner Level 1 Groups: Registered
Joined: 28/03/2017 Posts: 5 Points: 15 Location: NYC
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So it was a pain (had to take the head off to get to the neck, to get to the right arm), but it looks like the servo cable in the right arm is broken and depending on how it's bent, it stops responding.
I'm going to need to order a replacement cause I'm out of spares - going to do a search through the forum cause I saw an e-mail template or so on how to request replacements / pay for forward-thinking spares.
Side question: I couldn't remove the Voice Recognition cable from the control board in Robi's stomach area - it doesn't have a notch to * push down * to release like the battery / power connectors. How is one supposed to release it?
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