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HomeRC & PowerAircraftHelicopterRadio - Hitec Aurora › Calibrating Hitec HS-7940TH Servos
01-29-2012 05:29 PM  6 years agoPost 1
dan-uk

rrApprentice

Bath, England

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Has anyone managed to successfully re-program the centre/neutral position on a Hitec HS-7940TH digital servo? I tried doing this on my Aurora 90N rather than using sub-trim, but now the swash rocks back and forth slightly as I increase/decrease collective pitch. I have subsequently reset them back to factory defaults and re-trimmed, now everything is fine again!

Any suggestions? It seems that by altering the neutral point, it is affecting my CCPM

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01-29-2012 06:14 PM  6 years agoPost 2
Heli 770

rrProfessor

USA.

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After resetting the the center are you resetting both sides of the end points?

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01-29-2012 07:39 PM  6 years agoPost 3
dan-uk

rrApprentice

Bath, England

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Yes, after setting the neutral point, I also set the left and right end-points. I have to confess though that these were not set evenly from centre, i.e. I set them up to prevent any binding of the control arms.

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01-29-2012 07:51 PM  6 years agoPost 4
Heli 770

rrProfessor

USA.

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They should only be off by 1us if it's set right. Use the S-Test Manual testing to see if it is set correctly. I would also use the Tx. to set servo travel.

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01-29-2012 09:32 PM  6 years agoPost 5
dan-uk

rrApprentice

Bath, England

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Something certainly isn't right... the AIL/PIT servos seem ok, it is only the ELE servo that is about 2mm out from min/max pitch (> 1us).

Let me try again tomorrow.

Thanks for the help

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