Martin Rowe 1 Posted January 27, 2015 Share Posted January 27, 2015 Hi I recently purchase a old 100" scale B25 bomber. I have just been checking it over to see what work needs doing. All the servos seem good apart from the ailerons. the model has a servo in each wing, unfortunately they have been built in so I don't have the model number. They appear to look a lot like a short but wide flat servo. when I connect the servos they will sometimes move to the end of their travel. Only ever one wing and not always the same wing. help? Quote Link to comment Share on other sites More sharing options...
Martin Rowe 1 Posted January 27, 2015 Author Share Posted January 27, 2015 The servo looks like this one in the link but the spline is on the face with the sticker http://www.hobbyking.com/hobbyking/store/__23923__Corona_DS_239HV_Digital_Slim_Wing_Servo_Metal_Gear_4_6kg_13sec_22g.html Quote Link to comment Share on other sites More sharing options...
Former Member Posted January 27, 2015 Share Posted January 27, 2015 [This posting has been removed] Quote Link to comment Share on other sites More sharing options...
Chris Bott - Moderator Posted January 27, 2015 Share Posted January 27, 2015 Martin, you say that they move when you connect them, so this means you're connecting the servos with the radio system turned on. Is there a reason for that? I'd expect you to be plugging everything together, and then turning the Rx on. Quote Link to comment Share on other sites More sharing options...
Frank Skilbeck Posted January 27, 2015 Share Posted January 27, 2015 If it is those servos, they can't be very old as they've only been out for a couple of years. I have a couple of the analogue version that I'm just putting in a plane they seem quite good. You might want to check that you haven't got a wiring problem and that the voltage on the signal cable is too low at the servo so it's not seeing a signal voltage, they aren't on a Y lead are they? if so that and long leads might be the issue and plugging them into the rx individually might be the cure. Quote Link to comment Share on other sites More sharing options...
Martin Rowe 1 Posted January 27, 2015 Author Share Posted January 27, 2015 Yes I have plugged in with the power on. I have tried the proper way as well. It's not that actual servo I was using it as.a reference. you may be onto something with the signal strength. I'll check it out. Quote Link to comment Share on other sites More sharing options...
Chris Bott - Moderator Posted January 27, 2015 Share Posted January 27, 2015 So, when they move to one end of travel, whether you connect them the proper way or not, do they stay there? Or do they return to neutral and work as expected as soon as they see a proper signal? Quote Link to comment Share on other sites More sharing options...
Martin Rowe 1 Posted January 27, 2015 Author Share Posted January 27, 2015 Nope one or the over goes full travel. Sometimes..... Quote Link to comment Share on other sites More sharing options...
Phil Green Posted January 27, 2015 Share Posted January 27, 2015 Is this with a decent battery Martin? When you say "when I connect the servos they will sometimes move to the end of their travel", what happens when they don't? do they work? If they're stationary, do they resist a manual twist? do they buzz? Have you tried each servo individually on a servo tester set to neutral? Are they on a Y lead or a channel each? Do the connectors have any visible corrosion or oxidisation? Presumably there will be a soldered joint inside the wing as the standard servo leads wont be long enough. Could it be the joint? I've found that Corona servos are superb. Cheers Phil Edited By Phil Green on 27/01/2015 23:38:37 Quote Link to comment Share on other sites More sharing options...
PatMc Posted January 28, 2015 Share Posted January 28, 2015 I had a similar experience recently whilst setting up a 4 servo large E glider wing. I was adjusting the control mixes etc on my Taranis with an old Rx nicad that I keep for bench testing plugged into the X8R when for no apparent reason the servos moved or ceased to move at random. Problem turned out to be that I'd ran the nicad down without noticing the voltage reading on the Tx or having set a low volt alarm. Quote Link to comment Share on other sites More sharing options...
Frank Skilbeck Posted January 28, 2015 Share Posted January 28, 2015 Same as Patmac, no issues with Corona servos on long leads with a 2s LiFe, not a Frsky Rx but I don't think the rx is an issue, the servo has to see the width of the signal voltage pulse, if it doesn't then it won't recognise the "instruction". Also if it is the HV version you've put the link to it's expecting to see a 2s Lipo. Quote Link to comment Share on other sites More sharing options...
Bob Cotsford Posted January 28, 2015 Share Posted January 28, 2015 Check the receiver isn't set to high-speed mode! If you switch the receiver on with the transmitter off the red led will flash slowly for normal mode or fast for high speed mode. I got caught out by this the other week and it caused some really odd behaviour with analogue servos and is likely to destroy the servo amps quite quickly. To change modes hold down the failsafe/bind button on the rx for a few seconds, ideally with no servos connected. Edited By Bob Cotsford on 28/01/2015 13:47:12 Quote Link to comment Share on other sites More sharing options...
Martin Rowe 1 Posted January 28, 2015 Author Share Posted January 28, 2015 You sir are a genious ! Quote Link to comment Share on other sites More sharing options...
Bob Cotsford Posted January 28, 2015 Share Posted January 28, 2015 Posted by Martin Rowe 1 on 28/01/2015 16:23:57: You sir are a genious ! no, I just had the same problem a week ago Quote Link to comment Share on other sites More sharing options...
Gary Vinten 1 Posted January 28, 2015 Share Posted January 28, 2015 well done Quote Link to comment Share on other sites More sharing options...
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