Asked — Edited

Question With Initialization Of Jd Robot Servo Are Not All Present

Hello, I received my jd ez-robot yesterday, this morning I rode the robot according to the proposed tutorials. It is connected in ARC as requested and that's when I have problems. All the servos are connected but when I go into project-configure, I realize that not all servos are visible in the interface. I also find that when I set a servo on the software, it is another that moves.j also have the two servos of the left foot and the left ankle that are blocked. Moreover I did not want to insist but there is a smell of burnt somewhere, so I cut the current directly. I say that this is the first start and that I have scrupulously respected all the instructions. I am going to attach to this mail, a screen printing of the console of adjustment of the servos and a photo of the reaction of the robot when I connect it via the function connect of ARC . Needless to say I am already a bit surprised at the reaction of the robot and I hope nothing is burnt or damaged. Can you help me please JD.comment test the servos one behind the other to find out if they are all operational? How to unlock the two servos that look blocked without breaking them? I have a servo tester for modelist, maybe it can help me to center all the servos avnt to redo the assembly?

Can you help me please ?

A big thanks in advance Olivier :(

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Hello, Bad news, as I thought, there are two servos that are grilled, I tested all servos one behind the other with a servo tester. And unfortunately there are two servos that are grilled, that of the knees Left and a servo of the left arm. Here is well annoyed, how is it possible to grill these servo during the first start up? Time to go to the project tab then click on configure and hop? The question I ask myself now is that if I replace my two servos, I will not have the same problem? I have downloaded the good tutorial JD and therefore I assume that when I connect my JD on ARC, it will look for starting parameters in the project JD no? So the servos should not already be running out and therefore forced and grilling not? And what can you do for my two servos that are roasted? I also have the developer box offered by a friend, can I take the two 180 servos from this box to put them on the JD? I have to say that it could really help me to wait for new servos. Here, I will attach a picture of the two servos grilled and the photo of the servo tester I used. Note also on the level of the servos, I saw that none of the servos stays tuned to their neutral, can I put them all in neutral before reassembling the robot? And then go through configure to complete the neutrals perfectly?

Thank you so much for your help, meanwhile I will remount the robot according to the tutorial and wait for your solution.

A big thank you to you in advance Oliver:( User-inserted image

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hi oliver

do you use the latest version off ARC ? and did you do the calibration.


I've never built a Revolution robot or even taken any of the tutorial for them. However I've seen this issue several times on this forum with the setup of these little robots. Each of the problems posted here seemed like the servos were installed in the robot before they were centered to what you call neutral. I think I saw a tutorial on how to do this. DJ even made a video a few weeks ago on how to do this to the servos in the feet I think. I think it would be a good idea to slowly go over each of the tutorials again for everything concerning building a JD and follow each step carefully before moving on. These tutorial steps should include calibrating each of your servos to center so this does not happen again.

Burnt smells coming from a servo usually mean that it's beyond working or soon to die. You need new servos. The servos included in the developer kit will work to replace your bad servos. However make sure you pick the exact servo to replace the bad one.

Lastly, Nomad is correct. Make sure you have the latest ARC version on your computer. Download it directly from this site or from within ARC. Good lick and have fun! :)


if you want i can do skype whit you.oliver



Hello Dave, and thank you for your reply, I just want to tell you that I followed all the tutorials in order and I scrupulously checked and understood each lesson and confirmed each one. I attached a picture of the lesson I arrived, and you will understand that I respected everything, I configured my jd on the wifi and the connection is impeccable. Then it is explained to connect the JD by the connect button, which I did, and this is where the robot went into the position I photographed and that the time to go in configure, The two servos had grilled, I did nothing but follow the instructions, then go on project and click on configure, what I did.There too I put the screen print of this That I saw, I of course cut off the power supply of the jd because I smelled the smell burned, but it was too late. So I understand your answer and I accept it, but I do not think I made a mistake. Thank you for your answer for the servos of the developer kit, so I will disassemble the two grilled servos which are both 180 degrees and take the 2 180 degrees of the kit, thank you very much for your indication. What I hope now is not having the same thing when I get to the servo tuning chapter, I must say I'm a little chilled. Anyway thanks to you for your answer. Bav Olivier;) User-inserted image


Hi Patrick, Am great to read your message, it will be with great pleasure, can you tell me when you would have a little time and we made a skype. It's when you want, when you have time, on my side I'm on leave so I would do based on you. In all case a very big thanks in advance.

Bat Olivier Ps: my skype is skull.ofcob Heuvelmans Olivier in Attert south province of luxembourg.


i have all day and avery day can contact any time.oliver


did you know that calibration and fine tunning are two diff steps?



I propose to you to make a skype tomorow morning at 10 am if it's ok for you.

You speak french ? :)) sorry for my bad english but sometime it's more easy in my mother tong ;)) French ;)).

About calibration yes i know and about fine tuning i'm not arrived at this point :(.

We'll speak about this tomorow if it's ok for you patrick, i'm happy to find a people whose can help me in my country great ;))).

Good evening Patrick and thank you very much for your help ;)

Best regards Oliver;) see you tomorow i hope, if you want another time you'll decide and i'll be ok with this ;))


sorry i dont speak french.but we will do fine in englich. tomorrow is fine.i alllreddy looked you up in skype.



It's not a problem, i understand now what you say when you speak about calibration, i have made this but tomorow morning i'll recalibrate all servo to be sure and we can skype at 11:00 am because i want to do this before.

Thank you Patrick and skype you tomorow with my bad english but my happy face ;))))

good evening

and thanks

oliver;) :D


yes we do this from start.leave the bad ankle dissasembled. we gonna calibrate whithout any bracket or foot assembled. so the servo can move freely to 90 degree (center)

seeya tomorow whit happy face.

good avening too


what you need to do is follow the calibration lessons from the JD Tutorial:

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hi dj

oliver says he done the complete tutorial step by step. so there must be something he missed or do not have latest version, from ARC.we dont know what device he using. so i thought it is a good idea to see in skype what oliver does, step by step.i just cheked the link again for myself. its really clear and a good video from the ankle.

thank you


Oliver has not completed the following tutorial steps in his user profile for the calibration lessons from the JD Tutorial:

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maybe he didn checked the box and just read it. am not doing this to undermind your tutorials, but to be sure the robot working good,and to see, whats going wrong.bud your wright averybody, chould read and checked the box.


Hello to all of you, I would like to apologize first because DJ sure to give the right explanation, I have actually done the calibration of all the servos, but not according to the tutorial of the site because I forgot this part And so I calibrate with a servo regulator. Which is not the right way, so I am totally at fault on that and I apologize DJ. It was Patrick (nomad 6r) who put me on the track, indeed he told me that there was a calibration and fine tuning and that it was two different things. So I reconvened this morning and I followed everything and confirmed this time the lessons I had not done. I disassembled and replaced the two servos that had burned and everything reassembled. And there are friends ! This time my jd lights up without force and I was able to start creating the profile for the servos and everything works normally. I had to stop during the creation of the profile because my battery is empty;). I will then charge the battery and finish the end of the profile for the servos. Dj, I will recommend servos this morning, to replace the two I grilled. I still wanted to apologize for my mistake and thank you all for your kindness and availability. EZrobot is professionalism to 100 percent, thank you again friends.

Patrick, I propose to maintain our skype of 11:00 am if it is always ok for you. I am a beginner in ezrobot and it would be nice to discuss with you the JD and its possibilt├ęs.

Br Oliver;


hi oliver

i saw the gap in your text about calibration. am still doing calibrations today.esspecially the fine tuning. i can do calibration,make motion,or eye movement show you a few things in ARC,but for for diff stuff best to post on, the forum here.

tip after using the robot let him cool off for 30 min before charging. after charging again let the batt cool off for 30 min your batt will last longer


Hi Patrick,

Ok , i have just one little question, when i have the screen for configure profile, all etiquettes of servo are not centred on the screen ,i join a printscreen, it's possible to align this labels on the screen ?

Thx you very much

Oliver:) User-inserted image


@skullofcob What is your screen resolution set at?


hi Richard R

thanks for helping.i was thinking about the resolution too. i think oliver still sleeping,he's not on skype.


Hi all,

Good job, i'm on my laptop and it's 16/9 screen, i have change my resolution and now it's ok

definitivly, you are the bests ,thanks Patrick and Richard ;))

Tomorow i'll start to learn with my JD, i 'll send to you a r├ęsume of my new adventure ;)))

best regards

oliver ;)


good work oliver.then you dont need skype session.