pilot76

My Feedback: (15)

i was optimistic after reading all the bad feedback, and bought a 120 flight pack with 5 125mg's i was going to put these in a h9 extra 27% maybe im nuts, but this is my everyday sport flyer. dont need digi's. im not being cheap here but my main focus is on jets and i use nothing but jr high end digi's in them. so any way these servos dont jitter at idle, but jitter alot through center movement, and ive also noted the over-travel then jitter back to normal travel, then jitter some more. this was on the bench 1500mah ni-mh 4.8v r-600fm rec. all jr sport extensions 3-24" 2-12" also had an st47bb on a 6" ext. rigged for throttle and noted no bad traits on that servo. whats up ? i wouldnt fly a 40 size plane with these let alone a 120 size? i called horizon they say they have a fix, but ive heard this before, one guy got his back and they did the same thing.

dsnyder

There have been some issues with running the 125 servo with extensions, y-harnesses, etc in a few cases and higher voltages will make it more likely, however if you send the servo in it can be corrected.

DrDeath

My Feedback: (3)

Danny,

Are there any production runs that we should be aware of? I have 7 that I plan on putting into my H9 P-47 1.50 and just want to make sure.

DD

Iflyglow

My Feedback: (79)

Danny
How could JR take such a gamble by producing a servo that does not work well with extensions or y's. [sm=confused.gif] What type of installlation does not use an extension or y connection.[sm=confused.gif] Is this problem also present with the whole Sport line?

dsnyder

Only the first shipment was affected, and only affected a small number of servos from the first shipment.

There was no gamble, it was an issue that arrived in a small number of servos, most are operating correctly. No, it absolutely does not affect the whole line of servos, and does not affect all 125 servos.

DrDeath

My Feedback: (3)

Thanks! Quick question, I had plan on using 6 volts, or should I stay with 4.8? Also, with the P-47 I would like to setup the retract servos on a seperate battery, how would you suggest doing that without having to buy expense power box?

Thanks

DD

dsnyder

You can use either 4.8V or 6V. If you are asking in regards to using w/ a retract servo however, most retract servos operate best on 4.8V, and some will not work on 6V. The least expensive option that I can think of for that would be to use a matchbox.

DrDeath

My Feedback: (3)

So, I would use a matchbox and attach the batter to it and have both servos tied into the matchbox, is that correct? If so, then I can setup each gear servo to cycle at seperate speeds. Did I get that correct?

Thanks again.

dsnyder

Yes. No, you won't be able to adjust the speed. Retract servos are generally not proportional and therefore not adjustable for speed or travel.

Sawacs

My Feedback: (4)

Danny, I ran into this same problem last week with 4 brand new 125's running a regulator with a 6V pack. I have been told that the servos need to be sent in and JR will add an additional capacitor to correct the problem. Can you shed any light as to wether this is true or not. If this is not the case, then what is the exact fix that takes place upon sending the servos in?


Thanks, Sawacs

dsnyder

As mentioned earlier in the thread, yes you can send them in to be corrected.

Sawacs

My Feedback: (4)

Danny, I should have been more clear on my question. I was wondering what the exact fix that is performed on the servos to rid them of the "jitters". Is there truth to an additional capacitor being added to the servo?

Thanks,

dsnyder

It is a change in components inside the servo.

Sawacs

My Feedback: (4)

Danny, a component change inside a servo can mean a multitude of different things. You have managed to dodge the original question "I have been told that the servos need to be sent in and JR will add an additional capacitor to correct the problem". The questions still stands.

I will, however, be sending the servos in to have them fixed and or replaced under warranty. In the future, when a customer asks a direct question, it would be nice to have a direct answer.

Cheers, Sawacs

JagBone

Danny,
Well I just installed three ( of four purchased) in a Pacific Areo Gee Bee 27%.
The Elevator servos are doing the jittering thing.
Do I need a Return Authorization reference number to send with the servos - or just send blind with a fix the jitters!QUOT! instruction?
Thanks for being here!!
MC?

JagBone

Danny,
Well I just installed three ( of four purchased) in a Pacific Areo Gee Bee 27%.
The Elevator servos are doing the jittering thing.
Do I need a Return Authorization reference number to send with the servos - or just send blind with a fix the jitters!QUOT! instruction?
Thanks for being here!!
MC?

dsnyder

You don't need an RA or anything, just send them in with a description of the problem, including your name, daytime contact number, and mailing address.

No problem!

Iflyglow

My Feedback: (79)

Now I wonder if I made a mistake buying 2 of them. I felt a little more comfortable after Danny said it only affected the first shipment, but all of these with the jitters are still from the first shipment. I will test mine this weekend. It will only take a bunch of these apparently sub standard servo's to trash a good reputation. Were was the R&D department when these were designed. The problem is apparently magnified with extensions, and y's. I do not know of many installations for a servo of this type were they will not be needed. It sounds to me like JR better get there head out of there ars.

dsnyder

The number of people that have been affected to date is very low. Most customers have not had any problems.

JagBone

Low ? compared to what?
Thank goodness the problem usually shows up prior to maiden flight & that Horizon is providing a no hassle exchange - well if finding a box, disconnecting from the craft, boxing it up , ect is not a hassle.
The why still has me wonder'in.

dsnyder

There have been a low number of customers affected. A majority of customers are having no problems.

RCdude13

My Feedback: (6)

Danny,
One out of three of my new ST125MG's is doing the jitters...I will send that one back. My concern is about the other two...although they are behaving fine now, could they be affected by the jitters once I start flying, or some time down the road? Could I send the two good ones in also to check them out? I get the impression that it is a fine adjustment that is made to the servo to stop the jittering...maybe my two good ones are right on the border of starting to jitter. What is your opinion?
p.s. I love all my other JR stuff!!!
Andris.

dsnyder

If they are working fine, most likely they will continue to do so. You can send them in for a check over if you'd like.

JagBone

Sent my five in by UPS yesterday.
6/2/2006 9:54:00 AM OUT FOR DELIVERY URBANA, IL !!

Four of the five acted up on extensions.
Will be overjoyed when received back so I can get that 27% Gee Bee Y @ 97" ws out on its maiden flight!!

Joedaniwhite

I have experienced some serious problems with my 125MG servos as well... I purchased 6 of these for a 28% Edge 540 back in January. With no engine running, the servos jittered at the end throws when I tried to run a 5 cell pack with a 6 volt regulator. 5.4 regulator made the problem better.

While setting up the aileron throws, one servo could no longer find center and would jitter. I finally got the plane all set up. While performing a range check with the engine running, I couldn't get 60 feet from the plane without the rudder servo glitching and hesitating in the center spot. All other servos acted normally. I moved the servo to another location on the plane and ran it up again. The problem followed the servo... For some reason this particular servo was very suseptable to any RF.

My local hobby shop was excellent and gave me credit on these servos toward some Hitecs. ALL PROBLEMS SOLVED!!!!