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Multi Function controller failure

Old 06-15-2021, 01:51 PM
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HSD L39
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Default Multi Function controller failure

I have a HSD L39 PNP version which I think has a problem with the multi function controller 2085 which causes intermittent total control failure,
This is the 3 rd time controls have failed and since the 2 nd failure I removed the Spektrum receiver /transmitter and replaced it with a new Jeti DS12 / REX10 thinking that it was the Spektrum causing the problem.
I have battery voltage displayed on the screen from both the batteries but only one of the two orange battery indicator light comes on, normally both are on and blinking and when batteries fully charged both are green, Note the batteries are 2S lipo which had just come off storage charge so hence the orange lights.
The throttle control goes direct from the receiver to the turbine ECU and that was still working ok but all flight controls going through the MF controller stopped moving.
Next problem was I could not turn it off by pushing the off buttons and could not toggle through the setup menu, I had to disconnect the battery plugs to shut it down, connected it back up and all worked perfect again.
This is the third time this has happened and not flying till problem solved.
Has anyone had problems with the HSD MFC 2085 ?
My question is what is causing this problem ?
Is it the Controller that is faulty ?
being indicated by only one orange light but both batteries showing voltage and the buttons failing to do anything when pressed,
or something else connected to the controller causing the controller to fail ? like a possible intermittent faulty servo.
Ive ruled out faulty transmitter/receiver problems by replacing the previous Spektrum gear with now Jeti.

What is our next step to solve this problem ?

Thanks in advance.
Old 06-15-2021, 02:56 PM
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powerjets
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Charge the batteries and see what happens on green indicators
Old 06-15-2021, 07:23 PM
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HSD L39
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Hi powerjets,
thanks for the suggestion, this is a very intermittent fault and I have bench run this setup for probably 7-9 hours problem free and I have run the batteries down to a lower voltage problem free.
The first 2 failures happened with fully charged batteries and the multi function controller indicated full charged batteries but the difference with this third failure was that I could not turn it off by pushing the off button and the menu toggle froze.


Last edited by BarracudaHockey; 11-12-2021 at 04:21 AM. Reason: removed quoted post that was deleted
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David J Ruskin (06-16-2021)
Old 06-18-2021, 12:47 PM
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Your best bet is to contact a HSD Rep. They would be better at answering your question.


Good luck.

If you can't say something nice, don't say nothing at all.
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Old 06-18-2021, 02:29 PM
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HSD L39
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I tried the local HSD rep and he seemed to think it was an installation problem of some sort,
HSD USA customer service aren't answering any emails
Old 06-18-2021, 03:52 PM
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Originally Posted by HSD L39 View Post
I tried the local HSD rep and he seemed to think it was an installation problem of some sort,
HSD USA customer service aren't answering any emails
You are the first report of a failure that I have heard with the multi function panel and of course anything can have an occasional failure. Might be a good idea to send the unit to HSD and let them check it out.
Old 06-19-2021, 05:18 PM
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Originally Posted by HSD L39 View Post
I tried the local HSD rep and he seemed to think it was an installation problem of some sort,
HSD USA customer service aren't answering any emails
How did you connect it, SBUS or multiple servo channels ?
Old 06-21-2021, 12:48 PM
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HSD L39
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Hi Wayne, I connected it by using multiple servo channels
Old 11-11-2021, 12:42 AM
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Hi
@ HSD L39:
Did you find out about the fault in your HSD-controller?

Mine is working fine but when pushing the 'off'-buttons of the controller, the receiver still stays on green.
What could be the problem? (Connection receiver/ box is on S-Bus)
Old 11-11-2021, 09:54 PM
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HSD L39
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Hi Swissy, I eventually got a free replacement MFC 2085 and everything is now going great, it was definitely the controller that was at fault.
I have eliminated the rudder, ailerons, elevator and turbine running through the MFC and have them running straight off the receiver so if it fails again I can still fly back and land. After a few modifications with control throws, the L39 is now going great, docile and reasonable easy to land.
Sounds like your MFC is having a few problems if the receiver is staying on after switching off, it shouldn’t do that, you could try doing a reset to fix the problem but before you do that go through every setting and write it down, do the reset and go back through the settings and confirm that setting haven’t changed, a good chance some will be different but easy to change when you are in the set up menu. Good luck Martin.
Old 11-12-2021, 12:36 AM
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Hello Martin
Thank you for your quickresponse, your help is much appreciated!
As I said the controller works fine beside this 'RX non switch off fault'. But as this occured just lately and not from the beginning I am a bit worried about.
I now wrote an E-Mail to my dealer and we will see what he says/ thinks.
You write you run the main functions straight off the receiver. This is what I will probably do as well. But then I will need to have a new receiver as we need -if I counted right-
9 RX-ports. Is rudder and nose gear on one port or separated?
Thanks again and best regards from Switzerland,
Daniel
Old 11-12-2021, 02:44 AM
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Gidday Daniel, It took me along time trying to get any sense or parts out of my dealer, finally after I sent them videos showing the problem it was agreed to send the MFC back to China to get checked out and it got caught up in China customs where duty had to be paid so it was agreed to send me a new one.
I’m using a Jeti REX 10 receiver, multiple ports and from memory for the rudder system I have a Y lead, one lead for the rudder servo and the other goes to the MFC for the nose gear servo.
You may want to look at the aileron and elevator horns, I doubled the length and reduced the throws back to about 14-15 mm instead of the recommended 25 mm. At high speed with the original short horns I noticed the roll rate was slower than at slow speed and I think the servos didn’t have enough strength at the high speeds and by doubling the servos mechanical advantage by lengthen the horns made a huge difference to both roll speed and general handling.
Cheers Martin.
Old 11-12-2021, 04:22 AM
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Cleaned up reported posts, move along boys and don't make me take further action.
Thanks
Old 11-17-2021, 07:40 AM
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Hello Martin
Sorry for the late answering - was off for some days, saw your response but could not get logged in RCU...
In the meantime I got in contact with one of the European (German) dealers and was told that apparently they never had such a problem. Have to say that I caused a short cut due to a wrong plugging to the receiver. Two needles on the MFC connector strip were de-soldered just before I could stop the current.
As the circuit board (?) of the MFC showed no visible damage I replaced/ resoldered the pins and everything is working fine - exept to what I already mentioned: when shutting down the MFC the receiver is still under power.
Seems the HSD company has no general importer/ service in Europe like 'HSDJetsUSA' e.g. and so things get a bit annoying.
Imho not worth taking the pain to send the controller back to China as you told us the way this can end...
So we will see what happens after some further tests.
Thank you for your help, also for notes concerning the aileron and elevator horns!
Regards from Switzerland, Daniel

Last edited by Swissy; 11-17-2021 at 07:43 AM. Reason: Orthography
Old 11-17-2021, 12:15 PM
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Hi Daniel, I was going to get rid of the MFC due to the problems that I was having and also I don’t trust Chinese electronics but I could not find a compatible controller that would operate the undercarriage retract system and brakes. The retracts work by the MFC sensing a high electrical load when the retract reach’s the end of its travel then shuts off the power, otherwise I would have used a Powerbox or Jeti power distribution system. Cheers Martin.
Old 11-17-2021, 02:40 PM
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Originally Posted by HSD L39 View Post
Hi Daniel, I was going to get rid of the MFC due to the problems that I was having and also I don’t trust Chinese electronics but I could not find a compatible controller that would operate the undercarriage retract system and brakes. The retracts work by the MFC sensing a high electrical load when the retract reach’s the end of its travel then shuts off the power, otherwise I would have used a Powerbox or Jeti power distribution system. Cheers Martin.

Have a look at the Assan AG68 for your retracts brakes and steering

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