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HomeRC & PowerAircraftHelicopterRadio - Futaba FASST › Futaba transmitter and CGY750 advice?
07-07-2018 02:35 AM  76 days agoPost 21
ezzywave

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Wash.

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Wow. I didn't get the instructions with the adaptor, or I mistakenly threw them away. I see now where the light is.

The receiver is powered with the BEC, not a separate battery. I measure 5.59v going into the receiver and the same voltage coming out of each of the receiver servo connectors. And 5.59v coming out of the SBE-1 on the SBUS connector.

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07-07-2018 02:40 AM  76 days agoPost 22
ezzywave

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Wash.

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I will remove pinion gear and connect bec to 750 throttle output.

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07-07-2018 02:55 AM  76 days agoPost 23
ezzywave

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Wash.

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Supplying power to the 750 turns on the receiver but still no light on the SBE-1.

Power is going thru it, no matter which way it is connected. So either the light doesn't work or the whole thing doesn't work.

BTW, those wires seem very small for supplying power to all the servos...

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07-07-2018 03:11 AM  76 days agoPost 24
wjvail

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Meridian, Mississippi

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Let me sleep on this.

What your 750 is doing is exactly what all my 750s do if I don't turn on the transmitter first. In effect what your seeing is that the 750 is not getting a valid serial signal from the receiver (via the SBE).

We need to figure out why you don't have a light on the SBE. It appears we can get power to it from either direction, 750 side or RX side, but the LED doesn't register. I'd be nice to see that LED flicker...

"Well, Nothing bad can happen now."

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07-07-2018 03:18 AM  76 days agoPost 25
Dr.Ben

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Richmond, VA, USA

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I agree Bill. I'm not seeing any set up mistake here.

Ben

Peak Aircraft/Team Minicopter Team Futaba Team Kontronik USA

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07-07-2018 03:36 AM  76 days agoPost 26
ezzywave

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Wash.

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I know that I will despise myself later for abandoning this project/problem/learning experience, but I am seriously tempted to find a used Futaba TX like the 7C that was mentioned earlier in this thread. The DX7 is the only TX I have ever used. Are the Futabas as easy to figure out as the DX7?

BTW, thank you guys very much for helping me out. I was lost.

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07-07-2018 04:13 AM  76 days agoPost 27
BrianApp

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Grand Rapids, MI

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The 7C is a solid TX that can be had for around $75 used. As far as which is easier I would say they have similar features but go about setting them up differently. Most people stick with one brand, get used to the "language" then don't want to switch. You may find it confusing if you are used to spectrum but it isn't any harder, just different. One main difference is the gyro gain is opposite (pos, neg) between spectrum and futaba. When using FBL you pretty much turn off all the fancy features on the TX and do all the tweaking in the FBL, espically with the 750. All the 750 wants to see is a linear 4 channel control (plus throttle and rudder gain). Just about everything the 7C can do should be set to INH (off) except when it comes the throttle cut or hold. The rest is done in the 750.

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07-07-2018 04:15 AM  76 days agoPost 28
Dr.Ben

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Richmond, VA, USA

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You can easily understand any transmitter Futaba has that you'd care to buy. Give yourself a little credit. Same people here ready to help you if needed.

Ben Minor

Peak Aircraft/Team Minicopter Team Futaba Team Kontronik USA

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07-07-2018 04:32 PM  76 days agoPost 29
wjvail

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Meridian, Mississippi

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I have spent more time thinking about this and even more time researching the SBE-1. Unfortunately I have not had an ah-ha moment.

As I mentioned, I don't have any personal experience with the SBE. I spent some time Googling and searching YouTube for anything that would help. There is surprisingly little to look at suggesting to me there isn't much more to this device than plugging it in. My intent was to find a picture or video with the LED illuminated. I would have been happy to see a picture or vid of it blinking or steady, either one, just to confirm its existence. I found nothing.

I am beginning to believe your SBE may be defective in some way. While it appears to have power, or at least is passing power on to down line components, it doesn't appear to be functioning as an intended. That is, it doesn't appear that the "Serial Bus Encoding" function is working.

The LED seems to be pretty simple. It only has two states - green and blinking and green and steady. That fact that your device has no LED display is troubling.

I suppose if it were me trouble shooting this, I'd simplify the setup and verify you can get a valid signal from your RX, through the Encoder, and to the 750. I guess a systematic and methodical approach is required. You have already verified the TX and RX are communicating. The next challenge would be to get the RX and SBE to function. To do this I'd be tempted to plug a 4 cell NiMh battery into your RX and plug pig-tails 1 & 2 from the SBE into the RX (you might consider simultaneously plugging in a servo into and unused servo slot to, once again, verify the RX is functioning). We have to get a green and steady light on the SBE. Without it there is no point in going on.

Can I ask how you acquired your SBE? They are out of stock almost everywhere. Did you buy it new? Do you recall having ever seen the LED - even momentarily?

I like a good puzzle. The challenge of doing the crossword is offset by the satisfaction of finishing it. I hope this doesn't turn into a situation where the unit was acquired used from someone that applied unregulated voltage from the main battery and thereby damaged it. Figuring out how this works is a good puzzle. Finding out it's a simple hardware failure would be unfulfilling.

"Well, Nothing bad can happen now."

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07-07-2018 08:19 PM  75 days agoPost 30
Scandar

rrApprentice

Santiago-Chile

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Maybe this video can help with the SBE-1.

Watch at YouTube

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07-07-2018 11:05 PM  75 days agoPost 31
ezzywave

rrNovice

Wash.

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wjvail- I got the sbe new from amazon. At least I think it was new. It came in a stapled OEM bag/package with a warranty paper. Hard to tell these days if you are buying a phony.

No, I don't recall ever seeing the LED come on.

I have spent hours searching the internet and youtube looking for sbe-1 info. I also found surprisingly little info. I also searched the cgy750 topic of this and other heli forums and can't find anyone with a similar problem.

Scandar- That, and others of his, are the videos I used to connect the SBI.

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07-08-2018 01:18 AM  75 days agoPost 32
Dr.Ben

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Richmond, VA, USA

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Unless there is something truly weird with that receiver, I think the SBE is bad. The LED indicates the presence of the signal that the 750 needs to see, and if it is not there, the 750 is not going to initialize.

I asked Nick Maxwell to review everything you have said and done, and he couldn't find a fault, either.

Ben Minor

Peak Aircraft/Team Minicopter Team Futaba Team Kontronik USA

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07-08-2018 05:12 PM  75 days agoPost 33
BrianApp

rrVeteran

Grand Rapids, MI

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I always thought it was a very simple device. Plug one side into the receiver ports and an sbus signal comes out the other. You may need to swap a channel or two to get the right mapping but that should be it. An email to support then they would probably say to send it in. I would do a defective swap with the seller first.
Don't spend hours on it.
Read the papers that came with it.
Contact support.
Return it.
Once in a while every seller will have a bad unit get out.

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