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Rear tail rotor problem - always on
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mpougnet
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Guests
November 15, 2011 - 7:07 pm

Hi All,

 

Recently broke my rear tail rotor motor so I ordered another one off eBay. I replaced the broken one but when I power on the heli, the rear rotor is permanently on? Any idea or help would be appreciated.

 

Thanks

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Syma Freak
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November 16, 2011 - 5:02 pm
Member Since: November 26, 2010
Forum Posts: 1430
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@mpougnet Are you saying you replaced tail motor or just the rotor? if you replaced motor how did you solder wires-more info,we will help you get it flying again---

"Fly like a butterfly sting like a Syma" http://syma107.com

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mpougnet
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November 16, 2011 - 5:14 pm

Hi Syma Freak,

 

Thanks for response. My actual tail motor broke so I bought a new one and took the old one out de-soldered wires and all. Fed the new motor in and soldered black wire where the blue one was and red wire where the red one was. If I fly it, I can hover and move backwards but there is no forward movement. Seems strange that the rear motor starts spinning the instant I switch the heli on. PLEASE HELP! hahaha

 

Thanks

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Syma Freak
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November 16, 2011 - 6:04 pm
Member Since: November 26, 2010
Forum Posts: 1430
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I can only think that - you may have soldered wires wrongly or some solder is joining the two wires together,or if touched mother board with hot iron caused a problem,check solder joints,if all else trying soldering wires the other way round-let me know

"Fly like a butterfly sting like a Syma" http://syma107.com

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mpougnet
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Guests
November 16, 2011 - 6:07 pm

I have tried soldering wires on different ways and it only changes direction of rotation. Do you think something on the board could have happened when I crashed? I was VERY careful when soldering so I do not think the iron touched the board during the replacement... Bleak I cant fly it properly! I love this thing!

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Syma Freak
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November 16, 2011 - 6:22 pm
Member Since: November 26, 2010
Forum Posts: 1430
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Yes a bad crash is nearly always causes a problem,you mentioned your tail motor broke,like in what way,snapped boom? The answer is to go back to the crash and what happened,so we can start from square one.

until I understand what happened to your tail motor in a crash hard to work out the problem,explain the damage-we will get to the cause of your problem.I have had crashes replaced parts only to find was something simple like resetting rotors and re tighten-Give me the info after the crash-SF

"Fly like a butterfly sting like a Syma" http://syma107.com

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mpougnet
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Guests
November 16, 2011 - 6:31 pm

When I crashed, nothing on the helicopter was damaged apart from the rear motor. The actual motor had broken. Little white part (housing brushes) seperated from the main section (silver part). I could see that this was properly broken so I bought a new little motor. I have de-soldered the wires twice now and swapped wires around and still does not work? 🙁

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Syma Freak
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November 16, 2011 - 6:43 pm
Member Since: November 26, 2010
Forum Posts: 1430
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Ok,just maybe the crash jarred the m/board also soldering on top of m/b have you taken the 2 screws off holding mother board to see if you overheated solder underneath-if that makes sense?

"Fly like a butterfly sting like a Syma" http://syma107.com

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mpougnet
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Guests
November 16, 2011 - 6:45 pm

how do you check the motherboard? Which screws do you remove? Do not want to disassemble the entire heli haha..

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Syma Freak
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November 16, 2011 - 7:01 pm
Member Since: November 26, 2010
Forum Posts: 1430
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Yes agree gets a little daunting,i have spent hours and parts rebuilding my helis not just Symas,one has to decide on time and costs of parts,hence i buy new ones.Still sounds to me doable.I also fly planes and get same sought of problems,so I start from the beginning.consider this,just maybe the spare motor you bought is faulty on polarity,no not saying that is it,just trying to uncover this problem as have to say intrigues me to what is wrong.The only way the rear motor can be running when heli switched on is surly a wiring problem from the new motor or soldering-sounds silly but have you dropped remote on to a hard surface?

on a plane if one solders the speed controller to the wrong connection to the motor the motor rotates the wrong way,guess just talking out my thoughts-I am nearly certain there are wires touching causing a short on M/B just trying to think about this,will try a few things,must say you have me beat on this at the moment-not for long--talk soon

"Fly like a butterfly sting like a Syma" http://syma107.com

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mpougnet
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Guests
November 17, 2011 - 1:41 am

I took motherboard out and noticed that one of the transistors had popped. I managed to source what I though was the same transistor. It has "ML5" printed on the transistor so I simply ordered 2 of them. I replaced the popped one but when I switched on the heli, the rear tail rotor came on but this time was spinning even quicker. I thought the one next to it was also popped so I replaced that one too only to render the heli useless. Nothing switched on, nnot even the LED. I was wondering if you know exactly what type of transistor is used on the H-bridge on the underside of the board?

 

Thanks

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Syma Freak
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November 17, 2011 - 7:07 pm
Member Since: November 26, 2010
Forum Posts: 1430
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no not sure,but will find out

"Fly like a butterfly sting like a Syma" http://syma107.com

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CPD
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Guests
November 18, 2011 - 2:37 am

Not positive, but this seems to me like the point where this heli becomes a drawer chopper that you pull parts from for a new one.

 

Either that, or buy a cheap one like the $15 apache or blackhawk, and just start parting it out for this one.

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mpougnet
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Guests
November 18, 2011 - 10:12 pm

VICTORY!!!!!!!!!!!! I sourced some new transistors and sorted! Like new... Happy days! For those interested the transistors are SS8050 transistors... Works perfectly!

 

Cheers

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Syma Freak
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November 20, 2011 - 1:16 pm
Member Since: November 26, 2010
Forum Posts: 1430
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@Mpougnet,cool mate glad you found the correct transistor,helps us all,well done Wink

"Fly like a butterfly sting like a Syma" http://syma107.com

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CPD
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Guests
November 21, 2011 - 8:25 am

yeah, bravo!

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