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HelicopterRadio - JR DMSS › JR 7202 Programming questions - Problem's
07-12-2008 03:48 AM  9 years agoPost 1
Big Daddies Heli's

rrApprentice

Parts Unknown to the X Wife :)

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What's up fellas ??
I have a Programming issue with my JR 7202 Heli Tx.
forgive the Noob Excuse but I've never programmed a Tx. Before this
I have always used Factory Tx.'s with 6 of my Electric Heli's
I have a .30 Size Nitro Heli w/ a JR R700 Rx.
I was able to set the Freq,modulation,channel and reverse the 2,3,4, servo's Via the Manual
and I tried to set the 3 servo 120' and the 3 servo 90'
which I don't know which one I'm supposed to be using ???
any way the Servo's on the Heli are moving correctly with stick imputs now, but now I'm having trouble with the Centering of the Servo's
when I go to the Servo Monitor screen, the Aileron and Elevator are about 2/3 rd's of the Way over to the Right, and the Throttle is 1/3 of the Way over to the Left on the Graph
The only time I can get the Swash level, is at 1/2 throttle
and as soon as I move the Throttle to the Low Position, the Swash tips back and to the Right Hard
I tried to adjust the Sub trim + and - 5 Points with no change at all
is it a Mixing Problem ? and How do I fix this
I have been going over the Manual and I'm at a Loss as what to do at this Point
Does anyone Have any suggestions ???
I would appreciate any "HELP" you guys can give me
Thanks
Rich D........

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07-12-2008 06:00 AM  9 years agoPost 2
dkshema

rrMaster

Cedar Rapids, IA

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First --- set all trims, all subtrims to ZERO, neutral

Center the sticks. Remove the servo arms from the servos. If you have linear, zero to 100% pitch and throttle curves, all servos should be centered when you do this.

Now, put the arms back on the servos. You may notice that there is only one position where the servo arms appear to be centered (perpendicular to the sides of the servo). The other three positions (assuming you're looking at a 4-armed servo wheel) will be close, but not perfectly centered. This is due to the way the spline of the output shaft and arms are designed. Put the screws back in that hold the arms on the servo output shaft.

Is your helicopter one that requires CCPM mixing for the swashplate? If you don't know, at least tell us what heli it is, we should be able to figure it out from there.

If it's a CCPM swash, you most likely need to select 120 degree CCPM, there are very few helis on the market that use 90 or 140 degree CCPM mix.

If your heli is NOT a CCPM mix heli, don't turn on the CCPM mix at all.

If you need to know how to set up a CCPM radio and swash, read this very long post and follow it. You have a DX7, this should work quite well for you:

http://www.runryder.com/helicopter/t410466p1/

-----
Dave

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

Team Heliproz

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07-12-2008 06:16 AM  9 years agoPost 3
Big Daddies Heli's

rrApprentice

Parts Unknown to the X Wife :)

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JR 7202 Tx. Programming Problems

The Heli is an Old Nexus
I have three of these Heli's all with JR Rx.'s
How do you Determin that you Don't need CCPM Mixing on one of these??
I also Have an Old Concept 46 VR
that I also intend to use the JR 7202 to fly it
I've been at this for three Years and Have Never Had to Program a Tx. I Have Been Flying E Flite and Walkera's up to this Point and I aploigize for Being such a Noob at this
I feel like a Window Licker when it comes to this Radio
so the Servo Monitor Screen is wrong ??
the Bars are not in the Middle Position as it shows in the Manual that they Should Be
and the Mixing looks to be wrong when you move the Throttle upwards
only One Blade Pivots when you move the Throttle back and Forth too and all Servos are moving back and Forth with stick inputs
Rich D...

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07-13-2008 07:18 PM  9 years agoPost 4
Big Daddies Heli's

rrApprentice

Parts Unknown to the X Wife :)

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JR Tx. Programming Issues

I have found out another Problem with this Programming Issue
When ever I raise and Lower the Throttle, the Swash tips back and Forth
This Shouldn't happen, I Have Been Flying Heli's for years (Electrics)
and when you raise the Throttle the Swash should go downward (Level) to change the Pitch on the Electric Heli's

But the Throttle is tipping the Swash and It's a Mystery to me Why this is Happening I have tried Messing witk it again Last Night and I Have no Clue Why this is Happening
Any Suggestions ??????
Thanks
Rich D.......

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07-13-2008 11:09 PM  9 years agoPost 5
dkshema

rrMaster

Cedar Rapids, IA

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Nexus is NOT a CCPM heli.

A CCPM heli uses three servos working in tandem to support the swashplate as well as to raise, lower, and tilt it.

Do NOT enable CCPM swash mixing for your heli, it will NOT work correctly.

The Concept also is NOT a CCPM heli.

For BOTH of your helis:

The servo that tilts the swashplate side to side plugs into the AILERON channel on the RX.

The servo that tilts the swashplate fore and aft plugs into the ELEVATOR channel of the RX.

The servo that controls the collective pitch plugs into AUX 1 (Channel 6) of your RX.

Throttle plugs into the throttle channel.

TX needs to be set to select HELI mode operation. This will automatically assign collective pitch control to channel 6.

DISABLE the CCPM 120/90 or whatever mix you have turned on.

The swashplate in the NEXUS and the CONCEPT is fixed, it does NOT move up and down. The pitch slider moves the washout base up and down the shaft, and is moved by a single servo.

-----

Sorry I didn't reply sooner, I just got back from a weekend long fun fly and didn't have access to the net till just now.

-----
Dave

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

Team Heliproz

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07-13-2008 11:23 PM  9 years agoPost 6
Big Daddies Heli's

rrApprentice

Parts Unknown to the X Wife :)

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OK I'll try that

I have the TX ON 2 servo 180' setting as I saw in your Post
I will go over the Plug Locations in the Rx. to see if there in the right Ports
I'm greatful that I have some HELP from you
I have 6 Nitro Heli's now .30's .50's & a T-Rex 600N that all Have to be Programmed into my Two Tx.'s
I have a Dx6i that I'm gonna Put the T-Rex & Gohbee Stinger .50 on it

I Hope you'll "stick around" (no punt intended) so I can ask you some Questions on THESE also ...
Thank You very much dkshema
I really appreciate this Help on Programming this Tx.
Rich D.....

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07-13-2008 11:48 PM  9 years agoPost 7
dkshema

rrMaster

Cedar Rapids, IA

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No, no 3-servo 120 degree setting, no three or four servo 90 degree setting, no 2-servo 180 degree setting.

For your Concept AND your Nexus, you MUST set the selection as shown below:

The window MUST say 1 Servo, NORM. Anything else will NOT work.

The servo that controls THIS bellcrank controls fore/aft cyclic and plugs int the ELEVATOR channel of your RX:

The servo that controls THIS bellcrank controls the roll axis and plugs into the AILERON channel of your RX:

The servo that controls THIS bellcrank plugs into the AUX 1 channel (channel 6) of your RX:

With the sticks centered at neutral, a linear 0 to 100% pitch curve in your TX, position the arms on each servo exactly as shown in the pictures above.

If you need help with the tail rotor stuff, ask.

-----

When you get around to setting up that 600N you have, you will need to enable the 3-servo 120 degree swash mix, and go through that long post I referred you to in an earlier post....

-----

You don't say what servo and gyro you intend to use on the Nexus (and the Concept, for that matter). If you are using a heading hold gyro (GY401, for example), do NOT use a high speed tail rotor servo such as the S9253 or S9254 to control the tail. The wire tail rotor drive does not work well with modern heading hold gyros and extremely fast servos. A high speed servo will put and excessive load on the tail rotor drive, and the wire drive ends up winding up and unwinding like a spring. It will give you erratic operation and eventually lead to loss of tail rotor control and most likely the heli. A HH gyro is OK on these older birds, but team them up with standard slow servos such as the JR 537 if you want your heli to last a long time.

-----
Dave

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

Team Heliproz

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07-14-2008 05:22 AM  9 years agoPost 8
Big Daddies Heli's

rrApprentice

Parts Unknown to the X Wife :)

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JR 7202 Programming

that worked like a Charm "1 Servo Norm"(holey $hit)
It's funtioning Normally Now,all the Plugs were in the Right Ports
Before every time I moved the Throttle up the Aileron 'pit',and throttle Servo's were moving at the Same time and the Swash tiped to the Left

DKSHEMA Did I tell you that you "Are THE MAN" ????

I've been Racking My Brain in the Manual for Days Now

The Tail Gyro is a Futaba GY 501 AVCS W/ A JR nes 537 Servo
I'll have to look at the Concept and I'll let you Know what Gyro & servo it has in it

The Servo is acting Weird too it is Buzzing and Moving Back and forth slightly very Fast and the LCD Screen on the Gyro Controller "battery Power indicator" is fluttering Slightly
do you think the Servo is Bad ???
I did put a New Flight Pack Battery w/ a full Charge in the Heli
The Gyro/servo does Move the Tail pitch Rod Back and forth when you move the Heli Left and Right Though I checked that Last Night and It's working

Thanks
again
Rich D

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07-14-2008 01:10 PM  9 years agoPost 9
dkshema

rrMaster

Cedar Rapids, IA

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Do NOT put the gyro into the digital servo mode when using a JR 537 servo unless you want to cook the servo. Analog servos and some digital servos cannot handle the fast frame update rate output by the gyro when it's operating in Digital Servo mode. Those servos will simply roll over and die when operated in that manner.

I would guess that this is why your TR servo is acting up.

-----
Dave

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

Team Heliproz

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07-14-2008 11:29 PM  9 years agoPost 10
Big Daddies Heli's

rrApprentice

Parts Unknown to the X Wife :)

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TR Servo

I don't see any setting for the Tail Rotor Servo in Digital Mode on the Display Screen on the 7202 Tx. or in the Manual ?????

Any other Idea's ????
Thanks
Rich D.......

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07-15-2008 02:07 AM  9 years agoPost 11
dkshema

rrMaster

Cedar Rapids, IA

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Digital servo setting for the Tail rotor would be found --- ON THE GYRO and its setting menus - not the transmitter.

For the 501 I think you have two choices, NORMAL or HIGH for the SERVO FRAME RATE SETTING. Set this feature to NORMAL.

-----
Dave

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

Team Heliproz

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07-15-2008 03:17 AM  9 years agoPost 12
Big Daddies Heli's

rrApprentice

Parts Unknown to the X Wife :)

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501 Gyro setting

OK I'll go through the Menu on the Gyro Controller and I'll give it a Shot and I'll let you Know what Happens
Thanks
Rich D......

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07-15-2008 04:36 AM  9 years agoPost 13
Big Daddies Heli's

rrApprentice

Parts Unknown to the X Wife :)

My Posts: All  Forum  Topic

Gy 501 settings

OK I went in and changed the Frm setting to Norm (it was on high) and as soon as I plugged the servo back in, it's still doing the Same thing
I even brought another Nexus Heli over and Plugged the Throttle Servo it into the Gyro Controller and it's still doing the Same thing buzzing & fluttering Quickly back and forth

The Fluttering on the Lcd Screen where it shows the Battery Voltage stopped as soon as I unplugged the Servo again

do you Think I should Replace the Gyro & controller Now ????

or is there some thing Else I can Try ???

Thanks
Rich D......

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07-17-2008 04:33 AM  9 years agoPost 14
Big Daddies Heli's

rrApprentice

Parts Unknown to the X Wife :)

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Tail Rotor servo Flutter

Hey DKSHEMA I looked over the Book that I got with the GY 501, and it looks like I've got the Wrong Servo in the Heli for the Tail Rotor
Could the servo speed be causing the Fluttering ????
do you think it's too slow ????,at .025 and I should have one in there that's .019 ???
the Book calls for a S9205 servo Not the JR 537 That's in the Heli right Now

Is there any thing Else I can try that you can Think of ????

If you think the Gyro is Faulty I will look into getting another one with a New servo

Please Respond

Thanks
Rich D

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07-17-2008 06:09 AM  9 years agoPost 15
dkshema

rrMaster

Cedar Rapids, IA

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The wrong servo can cause trouble, not so much the speed of the servo, but its ability to handle the update frame rate that's coming from the gyro and driving the servo to its position.

I'm not familiar with the 501, but from reading the manual, I thought if you put it in NORMAL (instead of HIGH) frame rate, that it might work with the 537.

Since you're going to be installing this gyro/servo on something like a Nexus or Concept with the wire tail rotor drive, you don't really want a high speed servo such as a Futaba S9254 or one of the others that usually come teamed up with the better gyros.

I guess what I'd suggest is that you purchase a gyro such as the Futaba GY401. You can buy it with or without the S9254 servo. Team the gyro up with your 537. If you happen to buy the 401/9254 combo, you can either sell the 9254, or you can keep it for that 600N that you said you had somewhere. Perhaps when you built that 600N chopper, you could move the 401 over to it, and use the 9254 there.

-----
Dave

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

Team Heliproz

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