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Optic 6 Sport pots offset?

PostPosted: Mon Dec 13, 2010 5:09 pm
by mongo
Hi there,
first of I'd like to say I enjoy reading through this site a lot. Great job!

Now to the issue.
I've been given an old Optic 6 Sport with a weird issue. I cant seem to get the pots calibrated.
When I got into the service menu and try to adjust low/high/center positions they are all offset.
Instead of getting -400/0/400 I'm getting -330/-230/-180 on all the pots (and the high point wont even go beyond 0, probably a software limit).
What could be the problem here?
I'm guessing there's something going on with the analog/digital conversion. Voltage levels on the ADC maybe?
My electronic skills are limited to say the least, but I know my way around a multimeter and soldering.

Any help and/or information would be greatly appreciated.
Thank you, pardon my poor English and best regards from Slovenia.

Re: Optic 6 Sport pots offset?

PostPosted: Mon Dec 13, 2010 11:25 pm
by RCModelReviews
Should the range actually go from -400 to +400?

Do the sticks work normally otherwise (ie: do they command a full range of servo movement?

Re: Optic 6 Sport pots offset?

PostPosted: Tue Dec 14, 2010 6:29 am
by mongo
As far as I can tell from the service menu the range should go from -400 to 400 (with 0 at mid stick).
The interesting thing to me is that all sticks are doing the same thing, at first I thought it could be just a bad pot.
With the calibration at -330/-230/0 (0 should be -180, but can set it to that value due to how calibration is programed) the sticks have full travel to one side and maybe 10% in the other direction.
I'll make a video when I get home from work, it'll be easier to explain that way.
Thanks for the help.

Re: Optic 6 Sport pots offset?

PostPosted: Wed Dec 15, 2010 6:45 am
by RCModelReviews
I don't have a schematic for the Optic 6 but I suspect that the regulated supply which is fed to the sticks has failed and is too low in voltage.

Re: Optic 6 Sport pots offset?

PostPosted: Thu Dec 16, 2010 10:49 am
by mongo
Sounds plausible. Any way for me to measure the voltage to the pots?
I'm guessing there's no easy way to fix this?

I still haven't found the time to video the whole thing, maybe tonight if time permits.