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**Janek** · 12-01-2009, 12:10 PM

If you're on 2.4Gig, during power up of Heli, hold the rudder stick of the Tx slightly to the left or right.

**Eddie** · 12-01-2009, 12:11 PM

Originally posted by Benjy View Post

Hi Guys, can someone help me with a question I have on the ds760. Just finished putting back together my TRex 500 after it found the ground...very quickly. Everything has gone back fine, but the gyro doesn't seem to be picking up heading hold and wondered if anyone has had the same situation happen to them. The blue light doesn't come back up on the gyro and the gear switch that it is rigged to doesn't do anything when you flick it. A few of my pals have said to reset it which I will try tonight from scratch, but is there anything else to take into consideration or to look out for that may cause this?

Had a simular problem with a GY401 on my T500. Re-binding it solved the problem...

**Benjy** · 12-01-2009, 12:14 PM

Thanks Janek, yes I am using a DX7 and AR7000, so only slightly hold the rudder stick to the left or right...Ok, perfect I'll give that a try and see how I get on. If all else fails I'll do as you say Eddie and rebind it.

**raptorheli2** · 12-01-2009, 12:39 PM

benjy, if it is a new spartan with fairly recent firmware you do not have to bind with rudder over. the reason this happens is because spektrum rx's do not need a tx signal to become live if you like so the rx is usually well past boot by time by time it binds properly.

this issue is covered on the spartan website and should be in your manual.

These receivers produce servo signals at power on and before the link with the transmitter is established. This initiates the gyro calibration process which is sometimes completed before the link is established. At this point it is no longer possible to enter the setup modes as this must be done during the calibration period.

Starting from firmware version v1.02 the gyro will not start calibration until the rudder stick is seen at the centre. Spektrum users should bind their radios while holding the rudder stick off centre. This becomes the default rudder output when the receiver is powered on which will now prevent the gyro from starting calibration until the link with the transmitter is established.

Starting from firmware version v1.07 the gyro will not start calibration until the gain is raised above 15% (either AVCS or Rate mode). Spektrum users should bind their radios while the gain is set to a value around 10% preferably in AVCS. This becomes the default gain output when the receiver is powered on which will now prevent the gyro from starting calibration until the link with the transmitter is established. This method of setting low gain is preferred over binding with the rudder stick off center which will become obsolete in future firmware revisions.

**Benjy** · 12-01-2009, 12:53 PM

Originally posted by raptorheli2 View Post

benjy, if it is a new spartan with fairly recent firmware you do not have to bind with rudder over. the reason this happens is because spektrum rx's do not need a tx signal to become live if you like so the rx is usually well past boot by time by time it binds properly.

this issue is covered on the spartan website and should be in your manual.

These receivers produce servo signals at power on and before the link with the transmitter is established. This initiates the gyro calibration process which is sometimes completed before the link is established. At this point it is no longer possible to enter the setup modes as this must be done during the calibration period.

Starting from firmware version v1.02 the gyro will not start calibration until the rudder stick is seen at the centre. Spektrum users should bind their radios while holding the rudder stick off centre. This becomes the default rudder output when the receiver is powered on which will now prevent the gyro from starting calibration until the link with the transmitter is established.

Starting from firmware version v1.07 the gyro will not start calibration until the gain is raised above 15% (either AVCS or Rate mode). Spektrum users should bind their radios while the gain is set to a value around 10% preferably in AVCS. This becomes the default gain output when the receiver is powered on which will now prevent the gyro from starting calibration until the link with the transmitter is established. This method of setting low gain is preferred over binding with the rudder stick off center which will become obsolete in future firmware revisions.

Many thanks for the above, I think I have the 1.02 version whereby I have bound the gyro before by going into the set up mode by toggling the gear switch and powering on the TX and heli at the same time...Unless the missus is willing to help on this one I find this really difficult. One of my pals uses an elastic band to hold the stick over while he toggles and powers up.

**raptorheli2** · 12-01-2009, 01:35 PM

there is a knack to it. i never actually had to bind with the rudder over as i had it down pat. but there was a knack hence the bind with rudder fix above.

what is important i have found is if you miss the entering setup you must reboot the tx and rx. it seems to work better when you first boot both items on my own dx7/a7000. as i said i got the knack for it so i didn't bother binding to the left.

you could always put the subtrim hard over on the rudder channel to bind to save holding the rudder i guess, never tried it but don't see why it wouldn't work. just make sure and return it to the middle after the initial config.

another thing i do is plug a servo into your gain channel (not a 760Us!!!!!) and flick the switch and actually see if the servo is moving a lot, if at all. i normally do that from habbit now before i put a gyro on my helis....old habbits die hard etc.

cheers

**Benjy** · 12-01-2009, 01:41 PM

Thanks ever so much for the advice, just by typing this thread I have learnt a few tips that will not just help me but some of the boys down the field as well.

So do you think that the blue light not coming on and the HH not working is just a matter of re configuring the gyro?

**raptorheli2** · 12-01-2009, 01:54 PM

thats why i suggested the above, plug a servo in and flick the switch to confirm that switch is actually doing something.

you should 100% rebind the radio as spektrum bind issues seem very weird and really unexplainable. i've lost a channel before and a rebind fixed it.....coincidence maybe?....who knows.

the blue light not coming on just means the gyro isn't seeing the switch being flicked, the gain/atv attached to it is too low to engage HH which means it won't go into setup. it could also be the led on the gyro broke in the crash, altough that i've never heard of.

i'm assuming you do not have the usb cable for the gyro or it would have latest firmware on it? if you do have it you can run diags on the gyro by running the gyro editor software and right click the top of the windown and start diags. this will do a little test on gyro and let you know what it is seeing.

first thing is first, plug a servo in and flick the gear switch, you want the servo to move pretty much it's full travel.

i would hazard a guess you have the gain in the rx plugged in wrong or it's loose/broken in the crash just on what you have said if it was working before.

cheers

**Benjy** · 12-01-2009, 02:07 PM

Yes I have heard this about the DX7 too.... Unfortunately I don't have the USB lead for the gyro which it sounds like is a good tool to have when you are re setting the gyro and checking it. I know one of my pals down the club has got one which I might see if he will let me borrow it.

I have the red plug plugged into the Gear slot on the RX and the black Plug into the Rudder. Yes it does seem a bit strange that it worked perfectly before. The tail moves in normal mode and hasn't lost any of its settings. It binds perfectly onto the tail with a just a smidge of servo binding as its full travel catches, its just this HH problem.

**raptorheli2** · 12-01-2009, 03:30 PM

do me a quick favour,

switch the heli on and move the rudder. does the servo return to the middle if you let the stick go? if not it's in hh. if so the led on the gyro is perhaps damaged from the crash.

cheers

**Sesame** · 12-01-2009, 04:10 PM

Benjy knows 2 of us that have got the cables. I'm sure one of us will rent it to him

Cheers Paul some really good info there, couple of things I was definately unaware of. will have to have a play.

**Benjy** · 12-01-2009, 04:42 PM

Originally posted by raptorheli2 View Post

do me a quick favour,

switch the heli on and move the rudder. does the servo return to the middle if you let the stick go? if not it's not in hh. if it does the led on the gyro is perhaps damaged from the crash.

cheers

Hi Paul,

Yes I tested that last night in that the servo returns to the middle. I even tried moving the heli left and right to see if the rudder moved telling me that it is in HH but nothing.

**raptorheli2** · 12-01-2009, 04:45 PM

ok, that is a little more info and a little more concerning. even in non HH the rudder should move when you try to yaw on the bench, i.e counter act the yaw by moving the servo in opposite direction. since you did not see this i can only assume there is no gain seen...i.e it's at 0.

you really need to plug a servo into that channel and see what it does when you flick the switch. when you do that please let me know and i'll try to assist.

cheers

**Benjy** · 12-01-2009, 04:50 PM

Ok mate I'm going to give that a try tonight. Thanks for all your help today Paul. I'll let you know tomorrow what I find!

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