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02-08-2006 01:11 AM  12 years agoPost 1
etrex

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Prosser, Wash. Usa

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After lots of g3 time and hours of lurking here to pick up some good info I set up my xl ccpm trex.... all was well except the tail would occasionally jump one way 4 or 5 inches. Thought it was a radio glitch so did all I could think of to fix... glitch gets more and more frequent the more flights I make and finaly so bad the tail sevo [futaba 3107] just chatters and even couses glitching in other servos. Thinking servo is fried I put in a hitec 56 Much better but still sits and slightly vibrates back and forth even when the heli is motionless on the bench and sometimes chatters. The gyro is a jr 500 and all was working well at first. changing the gain seems to make no diff. What do you think? another bad servo? gyro? rx? tx? is there a way to isolate any of these to see what the problem is? I'm am pretty green so any help would be appreceated. thanks etrex

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02-08-2006 01:25 AM  12 years agoPost 2
Gary Hoorn

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Annapolis Maryland USA

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I would unplug the gyro and plug the servo directly into the Rx and see how it responds. I am not familiar with that gyro but does it have a digital mode? If so that should be switched off. Hopefully a JR person will jump in here and help out.
Gary

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02-08-2006 01:35 AM  12 years agoPost 3
davidgp

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Orlando, Florida (by the mouse)

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While you wait for JR Gyro advice check the tail belt tension. It could be slipping, which will cause a sudden piro.

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02-08-2006 01:35 AM  12 years agoPost 4
etrex

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Prosser, Wash. Usa

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Gary, I did that and the servo seems to behave well that way, No digital mode that I am aware of but there is a switch on the gyro for sevo rate with high and normal positions. In the high position the servo definately wants to hum and chatter but even in normal position it still moves back and forth ever so slightly and occasionally jumps...

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02-08-2006 01:43 AM  12 years agoPost 5
etrex

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Prosser, Wash. Usa

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David, It isnt the belt tension becuase it is doing these things even while static on the bench with no blades turning. Also at times it will chatter or hum and the servo gets warm.[can't be good}

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02-08-2006 02:44 AM  12 years agoPost 6
etrex

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Prosser, Wash. Usa

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Now to add to the mystery.. since my earlier posts I have been trying to figure out whats haywire and while using a needle to flip the small switch for the servo rate on the gyro I noticed a curius thing [to me anyhow] when I touch the gyro case with anything metal everything glitches and the esc even beeps. the needle is not touching anything else but me and the gyro case. Should the gyro be grounded to something? or is it somehow grounded now when it shouldn't be? or maybe this is normal. signed really confused....help

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02-08-2006 03:07 AM  12 years agoPost 7
catfight

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USA

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etrex,

I also have the G500t. The top of the switch should be set to the left (non-inverted) and the bottom should be set to the right (low) for analog servo. This is the way I have it set on my trex and it works fine. I believe the bottom switch set to the left is called "high frame rate" and is to drive a digital servo at a higher rate.

Do you have your aux channel connected to your rx and is your tx programmed to handle it? I use the Spektrum DX6 radio and set it up on the AIl D/R switch to switch between HH and Rate mode. YOu then use the "Travel adjustment" to adjust out any drift.

Good luck!

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02-08-2006 03:12 AM  12 years agoPost 8
catfight

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USA

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etrex,

I also forgot- I fired up my trex and poked the gyro with some pliers and other items with some effect - these are sensitive little buggers. Also, do you have the "travel adjust limit" on the gyro setup to limit servo full scale movement?

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02-08-2006 04:08 AM  12 years agoPost 9
etrex

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Prosser, Wash. Usa

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catfight I have the switches as you say and have the gain set up so it adjusts from the tx servo travel, my understanding is that any setting between 1 and 49 is rate mode and 50 to 100 is HH does this sound right? also with the needle just very slight contact with the gyro case makes ALL the servos go wild. No poking neccesary so was wondering if that was some kind of electrical thing? I do have the travel limiting on the gyro turned up quite a bit to keep from binding Thanks much for your help... etrex

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02-08-2006 11:40 AM  12 years agoPost 10
catfight

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USA

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etrex,

Maybe you could borrow someone's gyro or take your's to the LHS and try it on a setup there? If it's affecting all other servos you may have an intermittent short. COuld also be rx.

Good luck!

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02-11-2006 02:05 AM  12 years agoPost 11
etrex

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Prosser, Wash. Usa

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Just want to thank all who helped sort out my problem I removed the gyro and sitting on the bench but still pluged in to rx and tail servo it worked fine, and the needle touching it didn't phase it a bit.... It is mounted under the tail and was very close to my speed cont. after moving the esc everything is working good again....The funny thing is that it flew fine this way for about a month before the prob. arose?

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