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Servos not working

Old 02-24-2010, 06:59 PM
  #1  
msohara
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Default Servos not working

I'm new to R/C flying and on my first flight with my Hobby Zone Super Cub I landed it in a tree. When I finally got it down I found that my servos were not responding. I charged the batt and tried again, but only the engine works. I bought new servos, but they don't work either. I can hear a slight noise when I move the controls but the servos don't budge. Any ideas?
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Old 02-24-2010, 07:13 PM
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firemanbill
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Hi Msohara, Did you unplug the original ones after you got it down for any reason?

It sounds like you could possibly have them plugged in backwards. Check your polarity and make sure they are in properly.
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Old 02-25-2010, 01:46 AM
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msohara
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Default servos not working

Thanks for the response Firemanbill. I tried to reverse the wires, but they only seem to fit into the esc/receiver one way. Is there a way to test the esc? Or can you think of another reason why the engine works but not the servos? I guess I could buy a new esc and try that... My cost total is already at about $6/second of flight time! Thank you for the help.
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Old 02-25-2010, 01:58 AM
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firemanbill
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Probably not that then huh? I wouldn't think it would be the esc though if the motor is working.

maybe something is binding in there. Have you tried moving the servos without them attached to the pushrods? Maybe take the horns off and see if they move.
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Old 02-25-2010, 04:55 AM
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Radbuster
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I crashed a Parkzone plane and had the receiver go out. If you had a hard crash, then you might have broken it. Interesting that the motor responds but not the servos. I would follow up on the noise that you hear when you move the controls. Something is responding.
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Old 02-25-2010, 08:24 PM
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msohara
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Thanks for the response. I tried the servos without the push-rods and still the same result. My best guess now is that the Anti-Crash was engaged (cutting power to the servos) and somehow the receiver partially broke and it froze that way. That seems odd, because I can here a slight hum on the old and new servos when I move the remote, but not sure what else could be broken.

I'll try a new receiver and let you both know if that fixed it. Thanks again for your help, If I ever get it in the air again - I'm sure I'll be back for more.
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Old 02-25-2010, 10:06 PM
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birdDog
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Not to sound like a know it all but you do have the ACT turned off now, right? I think it's called Always Crash Tech...
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Old 02-26-2010, 12:43 AM
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Sir Crash-A-Lot
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Could be stripped servos gears as well.

Mike
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Old 02-26-2010, 12:45 AM
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Radbuster
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MSOHARA:

I found the Parkzone receivers very fragile. I went thru several before I switched to separate components (RX, ESC, etc). When you get the hang of plane control, you can make the switch also. Good luck.
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Old 02-26-2010, 02:30 AM
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gramps2361
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Yes the brick in the SC is a weak link mine kept giving me trouble I swapped it out. If this is still under warranty I would get in touch with them and see what they say. I have heard that the manufacter is great to deal with they might give you a new brick for the bird. It is worth the effort to try. Mine went up in smoke at the end of a flight not a problem when it was in the air as soon as it landed I saw smoke never started again.
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Old 02-27-2010, 09:11 PM
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msohara
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I ordered a new esc. I did turn the ACT off and back on and off a few times to try to reset it somehow. I even unhooked the ACT wires and tried it. The new servos I ordered don't work either so I think it has to be the esc. I hope anyway. It does seem like a weak link in the SC. The landing in the tree was not as bad as it sounds. The small upper branches of the leafless tree sort of caught it like a bunch of long fingers. The top of the tree really swayed as it quickly slowed it down. No damage to the outside of the plane other than a few dents in the plastic prop.
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Old 02-27-2010, 10:24 PM
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If you don't chop the throttle almost IMMEDIATELY with any event that may stop the prop the stalled motor becomes a dead short and the RX/ESC can fry very quickly.
Very common newbie mistake. The ESC/RX on the Cub is a marginal unit.
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