dr1driver

Sounds like it, or the IC on the board gone bad. I'd trash it either way.
Usually the feedback pot is sealed, and if it isn't, all you can do is spray it
with cleaner and work it. All that does is move the dirt to a different spot,
to surface again in the future. If it's the IC, it'll cost more than it's
worth to send off and get repaired.
Dr.1 Driver
"There's a Hun in the sun!"

paul mcintosh

How old is it? Hitec is real good about replacing products that fail
prematurely.

If it is old, just take the case apart and clean out the pot with some
contact cleaner. That should extend its life a bit.

--
Paul McIntosh
Desert Sky Model Aviation
http://fly.mcintoshcentral.com

a.t.

There are many reasons why jitters develop and all small light weight servos
can be easily damaged if there is any binding in the control rods/surfaces
or if screwed down so tight that there is no vibration damping provided by
the rubber grommets or rubber mounting tape. A common problem with small
servos is with an incorrectly aligned pushrod being to tight a fit in the
control horn and exerting a twisting force on the horn, this puts a strain
on the whole unit leading to premature failure..

Hitec provides very good fixes for all servos on their web page =

Servo - Digital FAQ : Hitec answers***
http://www.hitecrcd.com/Support/Faqs/faq_digitalservo.htm
Servo - FAQs : Hitec answers.***
http://www.hitecrcd.com/Support/Faqs/Faq_Genservo_.htm
Servo - Stop the jitters.: Hitec answers.***
http://www.amya.org/jitters.pdf
Servo - Troubleshooting problems : Hitec answers.***
http://www.hitecrcd.com/Support/Faqs/servotroubleshoot.htm#top

many more answers at http://homepages.ihug.co.nz/~atong/
under "Radio Systems, Accessories, Alterations and FAQ"
sub section " Servo & TX alterations, calculators, clonepacs, make an ESC or
winch, FAQ."


Alan's Hobby, Model & RC Web Links
http://homepages.ihug.co.nz/~atong/
.................................................. .............

bill fulmer

I sent Mike Mayberry a rx from a two meter electric that had folded the wing
in flight. The resulting lawn dart had the rx splattered by the 7 cell
battery pack when it "landed"..

Hitec did not repair or replace my Rx... Rather, they nailed its remains to
to the shop wall to ward off evil spirits...

Bill

the natural philosopher

Thats true. I forgot. And a nearly exahusted rx pack will show similar.

If its on a servo extender, replace that, otherwise clean up the plug
contacts, and if it doesn't fix it, trash it or send it back.

craig

Ive had servo jitter on a sailplane and fixed the problem by twisting
the servo wire and putting on ferrite beads. The ferrite beads remove
most interference received by the servos.

Craig

rené

Standard Hitec problem - premature wear of pot. Cure: bend the pot
wiper so that it tracks *next* to the worn out carbon material.
Cleaning won't help, as there is nothing to clean - the resistive
material is gone. Happens first around mid position of servo.

After re-tracking the servo, use it in a secondary importance function
with the most occurring position not in the middle, such as throttle
control. Or as one of two aileron servo's (in a 2 servo setup
obviously) ...Or in a boat.

I have had several (cheap) Hitecs, that had to be "fixed" due to pot
problems, whereas the gearing, motor etc were still operating
perfectly.

However -
In the elevator position, use a healthy, top notch performing, known
good servo with an unblemished track record.

--
- René