Fun, Learning, Friendship and Mutual Respect
START  HERE


Unregistered
Go Back   HeliFreak > R/C Helicopter Support > Blade Helicopters (eFlite) > 120 SR


120 SR Blade (eFlite) 120 SR Helicopters Information and Help


Reply
 
Thread Tools Display Modes
Old 08-24-2011, 12:51 AM   #1
cortesoft
Registered Users
 

Join Date: Jan 2011
Location: Los Angeles, California
Default Elevator controls not working

I have had my 120 SR for a while now, and it has worked great. Recently, however, the elevator controls seem to have stopped working. I noticed it while flying one day when suddenly I couldn't move forward or backwards anymore. There is no noticeable damage, but I can see when I move the elevator controls nothing happens. There is a slight electronic hum when I move the elevator controls, like something is trying to move, but nothing happens. All other controls work normally.

I am thinking I will probably have to take it into the shop, but I figured I would ask here first to see if anyone has any ideas I can check before taking it in. Thanks in advance!

Daniel
cortesoft is offline        Reply With Quote
Old 08-24-2011, 12:58 AM   #2
CarCrazy
Registered Users
 
My HF Map location
Join Date: Aug 2011
Location: San Dimas Ca
Default

Check the gears on that servo. If they are all good then I would try to move the servo gear by hand very very very carefully. If that doesn't work then the servo might have gone out on you.
CarCrazy is offline        Reply With Quote
Old 08-24-2011, 01:34 AM   #3
cortesoft
Registered Users
Thread Starter Thread Starter
 

Join Date: Jan 2011
Location: Los Angeles, California
Default

The gears look fine. I tried spinning them by hand.. it spins ok, except it seems to get caught on something somewhere a bit in the rotation... and then with just a bit more force it gets through it and spins again until it catches a bit on the next rotation. It does this every rotation. The arm does move the whole range of the servo though. The other, working, servo does not do this.

This is leading me to believe there is something physically catching on the gear or rod. I am tempted to try to remove the larger gear and see if the servo can spin freely. Do you think this is a good idea?
cortesoft is offline        Reply With Quote
Old 08-24-2011, 04:05 AM   #4
Pfloyd
Registered Users
 
Posts: 7,027
 

Join Date: Mar 2010
Location: Jake From State Mascoutah, IL USA
Default

You most likely got dirt on the gears...use a stiff toothbrush and clean the large and small gears.
__________________
MCX-S300-MCX2-MSR-120SR-ScoutCX-Tandem Rescue-Pico QX-NQX-NQX3D-MQX-180QXHD-CB105-Syma S107-Syma X5C-Syma S109-Syma X3-ProtoX-JJRC H8c-Syma X12-Sky Viper-Spektrum DX6-Orange T-Six

USAF RETIRED 1968-1988 Vietnam Veteran
Pfloyd is offline        Reply With Quote
Old 08-24-2011, 06:24 AM   #5
timatworksg
Registered Users
 
Posts: 275
 

Join Date: Jul 2011
Location: Singapore
Default

Yes try cleaning out the gears with a toothbrush dry. Don't force it anymore in case a tooth breaks or whatever is stuck there will cause further damage.

Any hard landings recently? If yours is stock, those skid pegs that go into the fuselage stick out (especially the rear left peg-which handles pitch) and is very close to the gear of the servo. A hard landing will flex the fuselage and that protruding peg can and will hit the gear. If you read through the mods section, you will see it's recommended to file down that protrusion. Unless you use the RKH upgraded fuselage then it's no issue.

Let us know how it goes. If you have a magnifying glass, take a close look at the teeth...see if any are damaged or something is stuck in between or outta shape.
__________________
ScratchBuild Fomies(Too many have come and gone!)-Quadcopter-Little UMX planes!
timatworksg is offline        Reply With Quote
Old 08-24-2011, 10:26 AM   #6
Mr.Firemouth
Registered Users
 
Posts: 261
 

Join Date: Jul 2011
Location: USA, IL, Holiday Shores
Default

My buddy had one hang up, over and over again. We replaced the 5 in 1 and it has been great ever since. The micro servo motors can burn out. It is very common on the Ultra Micro planes that Horizon distributes. Because the wires are so small and soldered to the 5 in1 it is just easier to replace the 5in1 altogether.

If your blade is fairly new,(not sure how long a while is,LOL) call Horizon and ask about a warranty or discounted purchase.
__________________
~Rich
Radio-DX8
(3) Blade 120SR(RKH red trim, NiteFlite , Kestrel 500)
Blade CX3/UMX Beast/HK J3cub/Champ
Mr.Firemouth is offline        Reply With Quote
Old 08-24-2011, 05:01 PM   #7
Digital Don
Registered Users
 
Posts: 698
 

Join Date: Jan 2007
Location: Manteno
Default

"The gears look fine. I tried spinning them by hand.. it spins ok, except it seems to get caught on something somewhere a bit in the rotation... and then with just a bit more force it gets through it and spins again until it catches a bit on the next rotation. It does this every rotation."

I had exactly the same experience with a Champ brick a buddy gave me because of the same problem. Everything looked fine until I put it under a lighted magnifier. Then I could see that one gear tooth was split near the top. A little work with an Xacto knife and everything was again right with the world. I'm still using that brick today in an Albatros.

If you have a magnifier and a good bright light, give it a shot!

Don
Digital Don is offline        Reply With Quote
Old 08-24-2011, 05:30 PM   #8
Pfloyd
Registered Users
 
Posts: 7,027
 

Join Date: Mar 2010
Location: Jake From State Mascoutah, IL USA
Default

Quote:
Originally Posted by Mr.Firemouth View Post
My buddy had one hang up, over and over again. We replaced the 5 in 1 and it has been great ever since. The micro servo motors can burn out. It is very common on the Ultra Micro planes that Horizon distributes. Because the wires are so small and soldered to the 5 in1 it is just easier to replace the 5in1 altogether.

If your blade is fairly new,(not sure how long a while is,LOL) call Horizon and ask about a warranty or discounted purchase.
Just get a new servo and instead of replacing the whole thing, just replace the large gear or small gear and see if that helps. I had a bad tooth on the large gear and it was really hard to see without a powerful magnifying glass.
__________________
MCX-S300-MCX2-MSR-120SR-ScoutCX-Tandem Rescue-Pico QX-NQX-NQX3D-MQX-180QXHD-CB105-Syma S107-Syma X5C-Syma S109-Syma X3-ProtoX-JJRC H8c-Syma X12-Sky Viper-Spektrum DX6-Orange T-Six

USAF RETIRED 1968-1988 Vietnam Veteran
Pfloyd is offline        Reply With Quote
Old 08-25-2011, 12:08 AM   #9
cortesoft
Registered Users
Thread Starter Thread Starter
 

Join Date: Jan 2011
Location: Los Angeles, California
Default

Wow you guys are exactly right. I looked closely at the larger gear, and sure enough there is a tooth that looks broken. I am going to attempt some surgery and report back to you how it does.

Thanks so much for the help! You guys are awesome.
cortesoft is offline        Reply With Quote
Old 08-25-2011, 01:35 AM   #10
timatworksg
Registered Users
 
Posts: 275
 

Join Date: Jul 2011
Location: Singapore
Default

We will be praying hard for a successful surgery! Drinks are available at the waiting area!
__________________
ScratchBuild Fomies(Too many have come and gone!)-Quadcopter-Little UMX planes!
timatworksg is offline        Reply With Quote
Old 08-26-2011, 01:18 AM   #11
cortesoft
Registered Users
Thread Starter Thread Starter
 

Join Date: Jan 2011
Location: Los Angeles, California
Default

Success!

I got out my Xacto knife and a good light, and got to cutting. At first it wasn't working. I actually stopped 3 or 4 times, waited an hour and then tried again. I was getting better results.. the servo would move partially but still get stuck sometimes.. but then suddenly it was moving freely! I moved the controls around a bunch to make sure it was really good, and then successfully flew around my living room!

Thank you guys so much for your help. This is the second time I have asked for help on here, and both times you guys have been able to show me how to get back in the air. Hopefully someday I can return the favor!
cortesoft is offline        Reply With Quote
Reply




Unregistered
Go Back   HeliFreak > R/C Helicopter Support > Blade Helicopters (eFlite) > 120 SR


120 SR Blade (eFlite) 120 SR Helicopters Information and Help

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 Off

Forum Jump


Copyright © 2004-2015 by RCGroups.com, LLC except where otherwise indicated. The HeliFreak.com logo is a trademark of RCGroups.com, LLC.