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Old 01-20-2009, 05:18 AM   #1
Fat Corgi
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Exclamation Finally! A way to repair your Spektrum DX6i trim-switch.

So it would appear that a number of people have reported that the trim switches on their Spektrum dx6i txís are failing. Well mine did today, 2 minutes into my first battery (perfect conditions tooÖ thanks Murphy). By failing, what usually happens is you can no longer trim your affected channel in a certain direction. For me it was my all important rudder channel, something that I use all the time, as I havenít upgraded my gyro yet.

Now, I must stress here that I chose to conduct these repairs myself, and if you happen to live a little closer to Horizon Hobby than me, you may prefer to have it replaced, repaired or exchanged by individuals other than yourself. However, if you are like me and on the other end of the planet, then this might be a good solution if youíre confident in your abilities. Not all of your trim switch failures may be the same as mine, but from what I can find in the forums, this is the most common situation.

Okay having said that, letís get started.

Firstly, remove your tx batteries and make sure you are certain of which trim-switch you are going to be trying to repair. There are 6 screws that hold the tx together accessible from the back. Remove these.
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Old 01-20-2009, 05:20 AM   #2
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Gently pull the sections of the tx apart, taking care of the wires that connect the two halves. There are three sets of wires that hold the two sections together that can be removed be gently pulling the plastic plugs that connect at the circuit boards. Before you do this though, make sure you devise a system of remembering which plug goes where, so there is no confusion when you are putting the tx back together.
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Old 01-20-2009, 05:22 AM   #3
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No that you can see the entire guts of the tx, you can find the small trim-switch printed circuit board (pcb) that hold the little offender. Triple check that you are looking at the right one, before attempting to remove it. The locations of the 4 trim-switches are indicated in the picture below.
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Old 01-20-2009, 05:24 AM   #4
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Undo the 2 screws that hold you trim-switch pcb into the chassis of the tx. The trim-switch assembly simply sits on the other side of the pcb, and will come loose once you lift the small circuit board up.
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Old 01-20-2009, 05:26 AM   #5
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By gently plying the opening at the back of the trim-switch assembly you will be able to remove the rocker switch.

Now you should be able to see the broken arm on your rocker switch. If the arm has come completely separate from the rest of the rocker switch then your repairs are going to be considerably trickier, but you can follow the same principles and have success.

If it looks like the repairs will be too fiddly for you, I recommend putting the whole thing back together and sending it off to Horizon Hobby before going any further. If notÖ

Read on...
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Old 01-20-2009, 05:27 AM   #6
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Now at this point, youíll have to improvise a little. You need to find something small and with square edges that you will shape to make little braces. I found an old 2-wire connector that I was able to cut up and sand into shape.
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Old 01-20-2009, 05:29 AM   #7
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Cut it down to a very small size that will not protrude over the edges of the rocker switch arm. Grab some super-glue and apply it to the broken arm and the area where you are going to be placing the little strengthening bracket. Make sure there is enough super-glue to adhere the little bracket to the arm and the body of the rocker switch, whilst taking care not to let excess super-glue spill onto other parts of the rocker switch that may hinder itís movement inside the trim-switch casing.

You want to make sure the arm protruding from the rocker switch is at as close to a 90-degree angle as possible.
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Eflite Blade 400: 401b, HS-65HB's, DIYRC "Mini-Flash", 3A UBEC, TRex 500 Skids
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Old 01-20-2009, 05:30 AM   #8
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Itís up to you which side of the arm (top or bottom) you place your little brace. Or maybe you want to do both just to be safe. As long as the braces are small enough, there should be no issue. I put one on my other arm for super-safeness.
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Old 01-20-2009, 05:31 AM   #9
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Itís at this point I discovered that Spektrum has made changes to their design of these little rocker switches. The one that failed on mine is not of the new design. The newer design incorporates a small chamfer to reinforce the arms as can be seen below.
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Old 01-20-2009, 05:33 AM   #10
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Once your glue has dried and you are confident in the strength of the repaired rocker-switch arm, you can slide the rocker back into the trim-switch casing. Test to make sure that the trim-switch can move through it's full arc in its case, unhindered by your new brackets.

Replace the 2 screws that hold the trim-switch pcb, plug in the 3 sets of wires that join the two halves of the tx, then to finish, fasten the two sections of the tx together with the 6 original screws.
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Old 01-20-2009, 05:36 AM   #11
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Now just test you repairs, and see if you are able to trim the affected channel.

I would recommend being gentle with the trim-switch for a while, as they are not of the most robust construction despite your fine repairs.

I hope this helps some of those broken dx6i’s out there, and helps get some of those grounded Blade 400's back in the air.

Happy flying

The Fat Corgi
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Eflite Blade 400: 401b, HS-65HB's, DIYRC "Mini-Flash", 3A UBEC, TRex 500 Skids
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Old 01-20-2009, 08:15 AM   #12
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Thanks for the tip - this is a great explanation and pics!
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Old 01-20-2009, 11:21 AM   #13
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NIce job. I have done a lot of fabricating on 1:1 off road trucks. The technical term for the brace you added is a gusset. Used all the time in fabrication. This is a very nice do it yourself fix.
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Old 01-20-2009, 12:41 PM   #14
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Nice job!

I had the same thing happen to my rudder trim switch. I used a material called aramid yarn, which is a kevlar yarn, its used as a strength member in fiber optics. I had some laying around my house. I layed down some CA and wrapped the rocker switch arm and main post in a diagonal weave pattern. It worked great and I dont think I could break it again if I tried.
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Old 01-20-2009, 07:16 PM   #15
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I had the same thing happen i just swapped mine with one of the ones
i do not use simple.
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Old 01-23-2009, 08:42 AM   #16
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I think I might have made the first post reporting this problem back in May '08. http://www.helifreak.com/showthread.php?t=73091

I have broken 3 of 4 levers as I keep switching them around and putting a non-broken lever on the rudder channel as that's the only trim I ever use.

I repaired all the broken switches by CAing them back together and building CA gussets top and bottom of the hinge point (just like Horizon did with the molding change).
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Old 03-06-2009, 10:44 AM   #17
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Thank you for this thread. It is a life saver. I got it repaired in 5 mins.
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Old 03-06-2009, 10:12 PM   #18
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Ditto for the thanks for the help!!

I thought I was going to have to send the radio in until I found this thread.
Using a small piece of wood, and CA did a great job of repairing the trim switch.
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Old 03-07-2009, 05:25 PM   #19
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Mine stopped working on the rudder trim as well. Was hoping to find the same broken link, but I didn't. When the PCB is out, it works fine...when I reinstall it, it stops working. You can still here the button click, but alas, nothing. I figure it's a bad wire.
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Old 05-02-2009, 04:24 PM   #20
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Thanks very much for this thread.

I received a Blade 400 a few days ago as a present and had not noticed that one of the trims on the DX6i was not responding in one direction.

I opened up the unit and was surprised to see how low quality a number of the pieces were but fortunately managed to balance the rocker so it now trims both ways.

Out of interest, for those more experienced, what type of controller do you have to step up to which delivers a solid build quality and something that will last for the long haul?

Thanks
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