Throttle channel changes calibration on it's own

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What steps will reproduce the problem?

1. Calibrate all channels, turn the radio off.
2. Turn the radio on in less than 10 minutes after calibration- all is ok.
3. Turn the radio on after 30 minutes, the throttle channel minimum position is 
not -100, but is -90

What is the expected output? What do you see instead?
The throttle calibration should not change, this is unsafe.
I have set minimum throttle warning, and after certain time frame, I can only 
pass it by pressing button, lowering the TH channel doesn't cancel the 
notification.

What version of the product are you using? On what operating system?
Turnigy 9X
er9x-r708
v1.5496-erez
FRSKY NT

Please provide any additional information below.

Please get back to me if there is a solution.
I can also demonstrate the issue on video if necessary.

Thanks for interesting firmware, it is well comparable to my JR12x!

Regards,
Andrew

Original issue reported on code.google.com by andris.s...@gmail.com on 18 Nov 2012 at 11:37

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I have not seen this on my 9x radios.  I do not believe the software 
calibration is changing, so the problem is most likely in your pots.  Did this 
problem start with a particular revision?  If you flash back to that earlier 
version, is the problem still there?  Problems with the pots on the 9x are not 
unheard of.

Original comment by torr...@gmail.com on 3 Jan 2013 at 11:12

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I have the same problem.Have the flysky 9x with new firmware  
http://er9x.googlecode.com/svn/trunk/er9x.hex
Also have the problem with function sound minder.also does not working disable 
welcome screen.also after some time hi change alone mode2 on mode1.Throttle 
channel changes calibration on it's own 1. Calibrate all channels, turn the 
radio off.
2. Turn the radio on in less than 10 minutes after calibration- all is ok.
3. Turn the radio on after 30 minutes, the throttle channel minimum position is 
not -100, but is -90 can you fix this problem?thanks

Original comment by digi...@gmail.com on 3 Feb 2015 at 12:43

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I have exact same issue. 9X flashed fine.  Radio calibration worked fine.  I 
can put throttle in lowest position and watch as the throttle increased. This 
continued after calibrating ESC and 9x multiple times. Never happened with 9x 
Original firmware.  Any clue?

Original comment by sdigiov...@gmail.com on 8 Feb 2015 at 5:37

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For both these last 2 comments (#2 and #3), please specify which revision of 
er9x you are running. The revision may be foun in the "Version" menu display.

Original comment by michael....@mypostoffice.co.uk on 8 Feb 2015 at 9:28

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I have the exact same problem. The only difference is that the calibration only 
holds for a few minutes before starting to slide on the throttle control. I 
started having this problem a couple of months ago. Prior to that, there was no 
problem. I have not changed the firmware after I first installed the version 
specified below.

Version er9x-r813 
v1.163-user

Original comment by george.h...@gmail.com on 25 Feb 2015 at 8:21

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If the calibration of low throttle has changed, has full throttle also changed? 
So, when you advance the throttle, does it reach full output BEFORE the 
throttle stick reaches the full throttle position.
Note: This problem could indicate the pot body on the throttle stick is moving 
or the shaft is slipping.

Original comment by michael....@mypostoffice.co.uk on 25 Feb 2015 at 9:30

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So, this is how I've experienced the issue:
I turn on my TX and notice that it's out of calibration. Throttle stands at 25% 
even as the stick is full down.
I then turn to calibration. It calibrates fine and all looks good. After a few 
minutes the full throttle calibration shifts down so that after a while, when 
having the stick full up, the throttle is still at 50%. After jiggling up and 
down a while, the throttle is now at 50% even as it is full down.

I then recalibrate again and all is fine for a while... 

Original comment by george.h...@gmail.com on 25 Feb 2015 at 11:38

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Go to the DIAGANA menu and look at the 4-digit value for the throttle stick (A2 
if on the left stick, A3 for the right stick). Move the throttle stick to low, 
middle and full and note the values for the 4-digit number. If (when?) 
calibration has been lost, go back to the DIAGANA menu and chech these values. 
If they have changed significantly (more than 5 in the last digit) then the pot 
has slipped. If they are about the same, but the calibrated value to the right 
has changed, then it may be the firmware.

Original comment by michael....@mypostoffice.co.uk on 25 Feb 2015 at 11:48

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Just because I want to reproduce this issue, it doesn't happen. I will however 
look at these numbers if it happens again and post any results.

Original comment by george.h...@gmail.com on 25 Feb 2015 at 1:42

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So, my problem seems to be hardware related. It happened today while I was 
flying, the throttle dropped down while I was starting up and I could only get 
about 20% throttle having it at the maximum position. Then checking the figures 
you've described, the figures on the left indicates that given the maximum 
position, it was only about 20% of what it should have been.

Original comment by george.h...@gmail.com on 7 Mar 2015 at 10:49

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I find solution for it, Throttle or etc. pot has bad quality but not inside.

Pot has 3 pins isolated from each other by glue, but sometime central pin not 
isolated good from other pins, because pin inside U shape and have from inside 
parts, central pin can have connection with other pin under glue.

You need just remove glue by knife and little bend and curve it from plate and 
thats all, you will have tottaly working potty.

attached file in red zones central pin can have connection

Original comment by KZAndre...@gmail.com on 24 Mar 2015 at 7:51

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Original comment by KZAndre...@gmail.com on 24 Mar 2015 at 7:51

Attachments:

• pot.png