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Old 02-24-2009, 03:16 PM   #1
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Default jr 9100s servo

hey guys i understand i may be posting in the wrong area before i get yelled at im sorry but anyways my problem is this,i have a jr 9100s servo that is giving me major headaches,ive had it hooked up to 2 diffrent recivers,2 diffrent radios,everything is charged up and the servo sits there and flutters the wheels back and forth in neutral position,it turns right and left great but at a stand still it flutters back and forth my guess is the servo has issues,i have written an email to jr but still waiting for a response,has anyone had this same problem and if so whats the cost to repair it,thanks for any help guys
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Old 02-24-2009, 03:25 PM   #2
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If you bought it new it should have a 3yr warranty on it.
Have you tried it in a different car or truck.
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Old 02-24-2009, 03:30 PM   #3
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i didnt buy it new,it was in a losi 8 truggy that i bought used and the whole truck is great except for that,no i havent tried it in a diffrent truck
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Old 02-24-2009, 03:33 PM   #4
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Quote:
Originally Posted by monteman1970 View Post
hey guys i understand i may be posting in the wrong area before i get yelled at im sorry but anyways my problem is this,i have a jr 9100s servo that is giving me major headaches,ive had it hooked up to 2 diffrent recivers,2 diffrent radios,everything is charged up and the servo sits there and flutters the wheels back and forth in neutral position,it turns right and left great but at a stand still it flutters back and forth my guess is the servo has issues,i have written an email to jr but still waiting for a response,has anyone had this same problem and if so whats the cost to repair it,thanks for any help guys
If you can feel play when you rock the servo horn with it off, the gears may be worn out, causing the flutter movement (internal pot is struggling to keep the neutral position with slop in the gear set). At least that what is wrong when the Futaba servos do it.
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Old 02-24-2009, 03:45 PM   #5
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ok how much play is normal in that servo because yes there is a slight amount of slop in it
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Old 02-24-2009, 04:00 PM   #6
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I had the same problem with mine . There is a support brace built into the top case for the center gear and part of it was chipped off which caused this problem . Sounds like you are having the exact same problem .
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Old 02-24-2009, 04:33 PM   #7
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i'm using the same servo on both throttle and steering. if you are using a spectrum radio, make sure the frame rate is at 5.5. also i bet the fluttering will stop once the car is sitting on the ground. plus what servo horn are you using? is this in a buggy?
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Old 02-24-2009, 04:40 PM   #8
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I Call it the "JR Death Rattle" Have had about six do this, My Brother has has a few as well, One person was talking about a broken internal part, Not sure, But I know that when this happens, it will burn up sooner or later, one week, one month, two months, then, poof* warrenty...
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Old 02-24-2009, 04:40 PM   #9
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it still flutters even sitting on the ground,its in a losi 8 truggy,using a losi aluminum horn
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Old 02-24-2009, 04:40 PM   #10
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monteman1970,

The inside of the case is broken, that is why it can't find center, send it back to Horizon and they will take care of it for you.

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Old 02-24-2009, 04:42 PM   #11
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im all for the warranty option only problem is i didnt buy it so have no reciept,and i have no idea how old it actually is
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Old 02-24-2009, 04:44 PM   #12
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Quote:
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im all for the warranty option only problem is i didnt buy it so have no reciept,and i have no idea how old it actually is
The servo is not 3 years old, call horizon and see if they will help you, if not you can purchase a replacement case.
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Old 02-24-2009, 04:46 PM   #13
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Happened to me too. Local experienced racer said a piece inside breaks and starts the flutter. I sent it to JR for free repair.
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Old 02-24-2009, 04:49 PM   #14
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ok will do and thanks a lot guys,RC TECH RULES
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Old 02-24-2009, 04:58 PM   #15
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Quote:
Originally Posted by monteman1970 View Post
im all for the warranty option only problem is i didnt buy it so have no reciept,and i have no idea how old it actually is
the servo has only been out for about a year, so it's under warranty. never running truggy, i don't know if it has enough torque for it. does the rattle stop if you have the wheels off. i'm thinking the weight of the wheels will cause the rattle. if you can, move the link closer to the center on the horn should help. but i think the servo is too fast and not enough torque for the weight of the tires/wheels.

i've had this same problem that you are describing on my giant scale airplanes when i used digital servos that didn't have enough torque.
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