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HomeRC & PowerAircraftHelicopterRadio - Spektrum DSM › Flashing lights on RX
04-28-2010 01:08 PM  8 years agoPost 1
Paul Gleeson

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Bonn, Germany

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I'm a bit confused, and searched the past messages but

I have an AR7000 (latest firmware), after a flight the receiver lights are flashing quickly 3 or 4 times per sec.

The manual says "The LED on the receiver will flash slowly indicating a power interruption (brownout) has occurred."

So if it's flashing quickly what does this mean?

I noticed no issues in flight with regard to control of the heli.

thanks, Paul

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04-28-2010 01:23 PM  8 years agoPost 2
BarracudaHockey

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Jacksonville FL

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Sounds like your flying with a bind plug in to me.

Slow flash is power failure, fast flash is bind mode.

Whats plugged into the BATT/BIND slot?

Andy
AMA 77227
http://www.jaxrc.com

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04-28-2010 01:23 PM  8 years agoPost 3
Frank Bostwick

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Cincinnati Ohio

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If they are flashing then you had some power interruption and/or TxRx signal loss, however brief. Id be checking my power system thoroughly before Id fly it again. Have you range checked the system? IMO, most likely a power system problem.

RIP ROMAN

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04-28-2010 01:33 PM  8 years agoPost 4
Paul Gleeson

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Bonn, Germany

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Nothing is in the Batt/Bind slot.
I always get solid LEDs and full control when I power up the TX then RX before I fly.

I'm running off a Kontronik Jazz BEC from 3S lipo.
Just sport flying an old Robbe Eolo with basic analog servos.
I would be very surprised if the BEC voltage dropped below 3.6v

Can I tell the difference between a power loss and TxRx signal loss by the flashing after I land?

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04-28-2010 02:13 PM  8 years agoPost 5
MarkToo

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Cambridge, ON

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Plug a flight log into it and see what info you get...

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04-28-2010 02:23 PM  8 years agoPost 6
Frank Bostwick

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Cincinnati Ohio

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I just went and read the most up to date manual................The only thing it says about a "fast Flashing" is, its in bind mode. (as posted by BH)........ Are you using a TX tray? possibly hitting the bind button on the tx? Did you do a range check? Maybe try re binding? Kinda at a loss here myself.........

RIP ROMAN

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04-28-2010 02:24 PM  8 years agoPost 7
Paul Gleeson

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Bonn, Germany

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Does the flight log show the lowest RX voltage seen, or just what it is now (on the ground, with no load)?

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04-28-2010 02:26 PM  8 years agoPost 8
Paul Gleeson

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Bonn, Germany

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No I don't use a transmitter tray, and because I have a converted Multiplex Royal EVO transmitter the bind button is not accessable unless you that the transmitter back cover off.

I pretty sure it is not a bind problem.

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04-28-2010 02:29 PM  8 years agoPost 9
MarkToo

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Cambridge, ON

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The flight log will show only current voltage but, will indicate any signal losses, and the offending antenna etc.

I would definitely buy or borrow one just to see where you stand with reception before digging too much further with anything else.

If your AR7000 is a current model, it's got the "Quick connect", and according to the flashing lights, you are experiencing a power interruption. But, check with the flight log first and go from there.

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04-28-2010 02:37 PM  8 years agoPost 10
Frank Bostwick

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Cincinnati Ohio

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The manual states, flashes slowly on a brownout.......
Go into bind mode intentionally to see if the flash frequency is the same.............

RIP ROMAN

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04-28-2010 02:50 PM  8 years agoPost 11
Paul Gleeson

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Bonn, Germany

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I think the frequency is the same. I'll check
(Maybe I am hitting my bind button if I hold the TX case tightly?)

Appreciate your help here.

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04-28-2010 08:53 PM  8 years agoPost 12
Paul Gleeson

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Bonn, Germany

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Ok did some tests.

During frame losses the LEDs blink, but return to solid once the frame losses stop. But of course you can't see this in flight.
I have ordered a Flight Log now.

After going through the binding process again, it's easy to see the difference between fast vs. slow flashing.

My problem is "brown outs" ie: less than 4.8v
Problem is my Jazz 40 only outputs 4.9v on the BEC.
So really does not need much to dip to 4.8v

I need to see if my Jazz is on the way out or not.

Thanks for everyone's help.

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04-29-2010 01:39 AM  8 years agoPost 13
dkshema

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Cedar Rapids, IA

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Low voltage monitor triggers at 3.5 volts, not 4.8V. 4.8V is nominal for a 4-cell Nicad/NiMh pack, and the receiver will fly all day long flawlessly on that voltage. If your Jazz is putting out a solid 4.9 volts, it is NOT going South on you.

Connectors, wire gauge, solder joints. That is where you need to look if you are having serious power problems.

Is your battery any good? A LiPo maybe not up to the challenge, or of not high enough continuous discharge rating to keep the motor and the ESC happy will wreak havoc.

If you were to be accidentally entering bind mode, your radio would never work, as once the TX or RX goes into bind mode, it's a goner till you successfully bind the TX and RX together.

You are seeing a voltage drop somewhere along the way in your system. Make sure all your wiring is sound and of sufficient gauge to do the job. If you somehow have a switch harness installed (unlikely if this is an electric heli) the harness and/or the switch would be suspect.

Are you binding one or more servos in flight? That will cause a momentary excessive current draw and a resultant momentary voltage drop.

-----
Dave

* Making the World Better -- One Helicopter at a time! *

Team Heliproz

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04-29-2010 02:19 AM  8 years agoPost 14
Justin Stuart (RIP)

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Plano, Texas

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I would sent that RX in to get it looked at. Something is up, and it is worth getting it checked out. You might want to send the Kontronik ESC in as well. Getting these issues checked out is better than risking a costly crash.

Avant RC
Scorpion Power Systems
Thunder Power RC
Kontronik Drives

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04-29-2010 09:32 AM  8 years agoPost 15
Paul Gleeson

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Bonn, Germany

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I checked the BEC voltage on the Jazz by stalling all three swash plate servos (Futaba S3101). Voltage dropped to 4.7v worst case.
I also checked servo binding and no problems there.

I will setup some wiring to meassure the current draw as well, and since I normally run with 3S, I will maybe try a 2S pack to see if I can get this lower.

If the Jazz BEC keeps a good voltage, then I guess there is loose connection or power issue in the RX somewhere.

I'm in the UK, so I need to find a place to send the AR7000 too.

I also have an AR6250 that I can swap out to see if I get the same issue.

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04-29-2010 10:36 AM  8 years agoPost 16
Paul Gleeson

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Bonn, Germany

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One last question.

If I get a "brown out" warning with the flashing LEDs on the AR7000, would I also expect to get some frame losses and holds from the Flight Log?

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04-29-2010 11:28 PM  8 years agoPost 17
Hokie_Steve

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Virginia Beach, VA - USA

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Another thing to check, if you turn off the receiver power and then turn it back on before flying without turning the transmitter off it will blink. It sees the power off and back on at the receiver as a voltage loss. I've had that happen when I accidently nudged the heli during gyro startup and turned it off and back on to restart it. If the receiver gets turned off, the transmitter has to be turned off also or it will blink. Could this have happened?

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04-29-2010 11:39 PM  8 years agoPost 18
RappyTappy

rrProfessor

Traveling the USA

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Mine was coming back after a flight on a Trex 500 like that. I rebound it and it went away. Then a few days later, no control and she went splat, the bec in the align esc went dead.

I would personally try and hook up a external battery to the power system and fly it and see if it happens again. You can't really create a flying situation and loads on the bench with what it sees in flight.

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