Go Back   RCCrawler Forums > RCCrawler General Tech > Electronics
Loading

Notices

Thread: 7950TH keeps turning and won't stop

Reply
 
LinkBack Thread Tools Display Modes
Old 12-26-2011, 02:25 PM   #1
Rock Crawler
 
Join Date: Oct 2010
Location: triad
Posts: 634
Default 7950TH keeps turning and won't stop

Did some crawling this morning and after two packs i went to put the third pack in. When i plugged it up, my steering started turning right and just kept going until it was maxed! I looked at my Tx and started trying to make sure my trim and EP were not changed and they weren't. Now, every time i plug up the rig, the servo starts turning and won't stop.

Any ideas or should i mail it to HiTec?
concretejungle is offline   Reply With Quote
Sponsored Links
Old 12-26-2011, 04:09 PM   #2
RCC Addict
 
Join Date: Dec 2006
Location: Oak Ridge, TN
Posts: 1,141
Default Re: 7950TH keeps turning and won't stop

Check that the channel didn't get reversed on the steering otherwise you might want to contact Hitec.
SINister is offline   Reply With Quote
Old 12-26-2011, 07:22 PM   #3
I wanna be Dave
 
Join Date: Nov 2010
Location: 07456 N. NJ USofA
Posts: 8,314
Default Re: 7950TH keeps turning and won't stop

Either plug a different servo in the channel (to test the TX & RX) or plug the servo into the throttle channel and see if the servo behaves.

It will give you a clue as to what the issue is.
Charlie-III is offline   Reply With Quote
Old 12-26-2011, 08:47 PM   #4
no talent hack
 
Join Date: Feb 2007
Location: Redwood City
Posts: 2,479
Default Re: 7950TH keeps turning and won't stop

pull the servo horn off and see if you have steering both directions. depending on the horn you are using it might have jumped a few teeth and now center isnt in the same spot
Nabil is offline   Reply With Quote
Old 12-27-2011, 08:00 AM   #5
Rock Crawler
 
Join Date: Oct 2010
Location: triad
Posts: 634
Default Re: 7950TH keeps turning and won't stop

OK guys, thanks for the replies.

I pulled the steering arm off and powered it up. With the arm off, it stays put at center; when i turn left, it works correctly, when i turn right it just keeps turning past the EP until it binds (i guess the gears inside) because you can hear it humming like it's bound up! I made sure that the Tx wasn't reversed and the EPs weren't changed.

I put on my old servo and it worked correctly so i'm guessing something is wrong with this one.

Dang! I guess I will contact HiTec.
concretejungle is offline   Reply With Quote
Old 12-27-2011, 08:34 AM   #6
I wanna be Dave
 
Join Date: Nov 2009
Location: Houston
Posts: 2,004
Default Re: 7950TH keeps turning and won't stop

Yup contact Hitec customer service. I had an old 5645MG that after maybe a year or so lost all power left/right. They repaired free of charge as the tech noted the servo had a bad amplifier...turnaround time was about 2 weeks. Great customer service!
alexchen86 is offline   Reply With Quote
Old 12-27-2011, 02:27 PM   #7
Rock Crawler
 
Join Date: Oct 2010
Location: triad
Posts: 634
Default Re: 7950TH keeps turning and won't stop

alright, this thing is starting to make me look stupid! I decided before i sent it back i would go to my LHS where i bought it and ask his opinion and see if it would be best to have him ship it off for me. We hooked it back up and it's working fine now!! WTF?!! I'm going to put the steering arm back on and see if that makes any changes.

I'm half tempted to send it off anyways and see what Hitec finds, if anything. After all it's about to be cold and nasty so now is the down time for crawling. Might as well make sure my gear is all up and ready to rock when the weather turns nice.
concretejungle is offline   Reply With Quote
Old 12-27-2011, 02:46 PM   #8
I wanna be Dave
 
Join Date: Sep 2009
Location: Nor Cal
Posts: 2,213
Default Re: 7950TH keeps turning and won't stop

What radio system are you using?
Rig Rocker is offline   Reply With Quote
Old 12-27-2011, 04:24 PM   #9
Rock Crawler
 
Join Date: Oct 2010
Location: triad
Posts: 634
Default Re: 7950TH keeps turning and won't stop

Spectrum dx3e.

I'm wondering if there was some water inside. The day before i was crawling and the front slipped off a rock and into the water. It was submerged for maybe 3 seconds.
Attached Images
 
concretejungle is offline   Reply With Quote
Old 12-27-2011, 04:29 PM   #10
I wanna be Dave
 
Join Date: Nov 2010
Location: 07456 N. NJ USofA
Posts: 8,314
Default Re: 7950TH keeps turning and won't stop

Hmmmm....interesting.

When I've had issues with a HiTec servo, it was a definite issue, not an "intermittent". Intermittents SUCK!!!!

Yes, you may have a few stray drops of water floating around.

Yes, now is the time to resolve issues.
Charlie-III is offline   Reply With Quote
Old 12-27-2011, 04:39 PM   #11
Rock Crawler
 
Join Date: Oct 2010
Location: triad
Posts: 634
Default Re: 7950TH keeps turning and won't stop

We are going to have a break in the weather next few days before it get's cold and nasty again. I"m going to give it another run and see what happens. If it acts up again, it's going in the mail!
concretejungle is offline   Reply With Quote
Old 12-27-2011, 04:41 PM   #12
Rock Crawler
 
Join Date: Jun 2009
Location: summertown
Posts: 512
Default

My 7950 did the exact same thing on my scaler about 3months back and when I took it apart I notice one of the o rings were not seated good.
I took the case apart and didn't find "water" but the board was covered in a very fine moisture. Let it set on the table overnight and dry and it's been fine since.


TapaTalk on Iphone4
Twisted Nuts is offline   Reply With Quote
Old 12-28-2011, 01:28 PM   #13
I wanna be Dave
 
Join Date: Sep 2009
Location: Nor Cal
Posts: 2,213
Default Re: 7950TH keeps turning and won't stop

Yeah, crack open the servo and let it dry out. Then put some dialectric grease on each case o-ring, and an o-ring w/dialectric grease under the servo horn. Or at least put a nice glob under servo horn. There are two orings in case at output shaft, but they can still leak. I would also add a little d-grease around the inside of wire grommet too. Its sealed with silicone, but can't hurt.

What you described is exactly what happened to me at the B-Day Bash G6 in my wraith. My 7955 went straight to full lock. It was fully submerged several times during comp, but one of the orings had split and let a tiny bit of water in to circuit board area. This was a very old servo and i should have changed the case o-rings.
Rig Rocker is offline   Reply With Quote
Old 12-28-2011, 09:05 PM   #14
no talent hack
 
Join Date: Feb 2007
Location: Redwood City
Posts: 2,479
Default Re: 7950TH keeps turning and won't stop

Put the thing in a sealed ziploc bag with a bunch of uncooked white rice. The rice will absorb any moisture
Nabil is offline   Reply With Quote
Old 12-29-2011, 12:47 PM   #15
Rock Crawler
 
Join Date: Oct 2010
Location: triad
Posts: 634
Default Re: 7950TH keeps turning and won't stop

Quote:
Originally Posted by Nabil View Post
Put the thing in a sealed ziploc bag with a bunch of uncooked white rice. The rice will absorb any moisture
This is a great wet phone trick!

OK, i sat the servo in front of one of my heat vents in the house for a day. Took it out today for 3 packs and it worked fine! Guess it got a little water in it.

I'm probably going to open her up and put some more dielectric grease in it so it will be better protected.
concretejungle is offline   Reply With Quote
Reply



7950TH keeps turning and won't stop - Similar Threads
Thread Thread Starter Forum Replies Last Post
Hitec 7950th Wasp26Jim Electronics 3 02-22-2011 07:34 AM
hitec hs-7950th on 3s dusty sweep Electronics 5 10-19-2010 03:14 AM
Anyone using a hitec hs-7950TH??? yzf128r Electronics 13 02-26-2010 04:28 PM
Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is On
Trackbacks are On
Pingbacks are On
Refbacks are On



All times are GMT -6. The time now is 01:42 AM.


Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2024, vBulletin Solutions, Inc.
Content Relevant URLs by vBSEO ©2011, Crawlability, Inc.
Copyright 2004-2014 RCCrawler.com