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Asked — Edited

Faulty Servo - Fixed :)

Hello fellow EZ-roboteers!

So this is just an information post, to share my experience with one of my modified servos that packed up yesterday. I was just about to take the plunge and hack a standard one to replace it but then thought "what the hell, I can't break something that isn't working" and got the tools out.

After I removed the four screws from the bottom, I hooked it up to my EZB and fired up a control to trigger the modified servo on full speed. When I checked the voltage across the red and black wires, it appeared ok so no fault with the cable I thought. I then checked the contacts across the capacitor and got nothing! On closer inspection, the solder between the black cable and the negative capacitor contact was weak (sorry if the picture below isn't that clear) and there was also a lot of play in the hole that takes the capacitor leg. Giving the cable a little wiggle made the contact and the servo whizzed into life.

So I disconnected the servo from the EZB, de-soldered the contact (where the black cable meets the capacitor), cleaned up the contacts and re-soldered it. Once I had re-connected it to the EZB, the is now working a treat!

This saved me irreversibly hacking a standard servo, so hopefully it might inspire others to have a crack at fixing something before committing it to the recycling pile.


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#2  

Way to go! This kind of thing has been a problem since the early 80's or maybe even earlier than that. Employees on an electronic assembly line are in a hurry and they don't do a very good job. They will only half solder a joint or not give it enough heat and create a cold joint. I see it a lot in solid state pinball machines.

United Kingdom
#3  

Cheers! After reading through the servo information on this site and cracking mine open, I think I may understand how a servo works now blush

Problem since the 80s you say? Showing your age a little bit there;)

#4  

It's great to learn new things. I should take a little time and read through more of what DJ has for us on this site.

Yes I do tend to show my age around here at times. However, I wasnt fixing electronics back in the 80's. Back then I was more interested in the other sex and having fun. Just in the past 10 years I've been learning how to work on these older systems from the 80's & 90's. I dont know what has caused me more problems, the other sex in the 80's or working on stuff from the 80's. eek