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HelicopterRadio - Futaba FASST › My Futaba 14mz's right rudder trim switch Fixed...
01-03-2010 08:31 PM  7 years agoPost 1
hpilotrc

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NY--->>Mooresville, NC USA 8/2005

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I went out on New Years Day to test fly my TRex 500 with the new tail drive shaft and noticed that my right trim (T4) was not working on my 14mz I opened up the transmitter later on but can't do anything till I at least have a part.

Has this happened to anyone? My 14mz is not even 4 years old and looks like I never used it...

I am wondering if I just need the one switch or the whole trim switch pcb (if there is one) has to be replaced? The switch still has a clicking sound but just no continuity (I hope).

For now I switched to using T6 as the rudder trim until I can fix it.

Michael

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01-04-2010 02:02 AM  7 years agoPost 2
kcordell

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O Fallon, MO

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Sounds like it may need a trip to Hobby Services.

Team Futaba, Team Synergy/Rail, Team Scorpion, Team Castle Creations, YS Engines, VelTye

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01-04-2010 04:28 AM  7 years agoPost 3
Dr.Ben

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Richmond, VA, USA

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I've seen that happen twice. Hobby Services can take care of the problem. I'm not sure if it's a board level service item or a discreet component.

Ben Minor

Team Synergy Team Futaba Team Kontronik USA
Progressive RC

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01-04-2010 04:48 PM  7 years agoPost 4
hpilotrc

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NY--->>Mooresville, NC USA 8/2005

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Replacing a defective trim switch in a 14mz....

The switch along with some spares are on their way. Hopefully this will not happen again!

Michael

Update (01/07/2010): Completed replacing both rudder trim switches. 14mz is up and running again. It looks like Futaba is using a different switch as it appears to look slightly different. I am glad it was the switch that was defective and not the associated electronic circuitry!

I may post some pictures later.....

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01-09-2010 02:41 AM  7 years agoPost 5
hpilotrc

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Trim switch replacement pics 14mz

Here are some pics in various stages of dissassembly:

Removing printed circuit boards without using adequate static discharge protection can permanently destroy sensitive electronic components and render you 14mz useless. Do not attempt dissassembly unless you are qualified to do so!!!

RF Module printed circuit board removed:

RF Module plastic pcb holder removed:

Main printed circuit board removed showing black plastic LCD holder still intact:

Top of main printed circuit board. Two ball grid array IC's (the main processor's) can be seen.

Bottom of main printed circuit board:

LCD Display in plastic holder is removed but the touch panel, two upper metal brackets, and associated potentiometer assemblies still have to be carefully removed. Then their are a bunch of screws (2 extra long ones) that have to be removed before the board can be pulled out. My transmitter happened to have at least one screw (you can see it) missing from production! It just happened to be where the faulty switch was.

Finally after removing the black LCD Display holder, glass touch panel, and some upper frame parts you are able to get to the trim switch assembly. The black plastic rocker trim switches are also different depending on the position they are installed in and will fall out easily! The trim switches are very small smd switches and care needs to be taken when removing them....

Those 6 black plastic rocker trims are different sizes depending on where they go. Make sure you know where they go during assembly or they will not stick out right on the front panel!

Michael

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01-09-2010 12:34 PM  7 years agoPost 6
kcordell

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O Fallon, MO

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I'm glad you are electronically skilled enough to take one of these apart. For the general modelling public, DO NOT DO THIS. Sorry, but a $2000 radio, it's going back to Hobby Services. At least if they screw it up (which they won't), they'll fix it. Just got mine back before New Year's for it's annual checkout (okay, so it was 4 years, since I got it). New touch screen (I didn't think it was bad at all but what a difference!), gimbals cleaned, adjusted, calibrated, and a new lithium battery.

Team Futaba, Team Synergy/Rail, Team Scorpion, Team Castle Creations, YS Engines, VelTye

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01-09-2010 04:13 PM  7 years agoPost 7
smallplanes

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S.C. ,SSA

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Theres no way i would have taking my radio apart like that i may never have got it back right. It looks like more parts in there than the space shuttle.


Spectra G 26cc
Jewel
Bat 27cc
Trex 700<br

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01-09-2010 05:36 PM  7 years agoPost 8
Four Stroker

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Atlanta

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Good Job ! Some people like to do this kind of stuff. As long as the flat ribbon cables have ZIF sockets, it's not that risky. The 9Z didn't. My 9VHP and 9Z both have the original lithium battery. As long as you keep a charged battery in the TX, it doesn't seem to matter.

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01-09-2010 06:40 PM  7 years agoPost 9
Kevin Dalrymple

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Indianapolis

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Great job on the detail phots. People have been asking for awhile when someone would take there 14mz apart and show us the pictures. I like what you have done.

Are you going to tighten the neck stap hook while you have it this far apart?

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01-09-2010 06:48 PM  7 years agoPost 10
hpilotrc

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NY--->>Mooresville, NC USA 8/2005

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Neck strap hook...

Actually I remembered some people having the hook come loose so I checked mine and it wasn't all that tight either. I removed the screw and lock washer and added some blue locktite on it and tightened it back up.

I usually don't use the hook but at least now that's one thing left I will not have to worry about.

About the pictures....I should have done a better job with them but was more interested in getting the transmitter up and running again. The last half of pics were taken without a flash and at a higher ISO which made them look too grainy...oh well.

Michael

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01-09-2010 07:30 PM  7 years agoPost 11
Peefor

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Norfolk UK

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Michael.
Excellent job, well done. Thanks for showing us the procedure involved. You have my utmost admiration.

Pete

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05-17-2015 03:06 PM  31 months agoPost 12
hpilotrc

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NY--->>Mooresville, NC USA 8/2005

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My old 14mz....

Links have been updated and should be working now!

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05-17-2015 03:39 PM  31 months agoPost 13
Rappii

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Norway

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Wow.. looks not easy..

Since I most replace the trim T3 to 14mz!!

Hirobo SDX/Turbulence D3 , Goblin Sab

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05-17-2015 07:07 PM  31 months agoPost 14
hpilotrc

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NY--->>Mooresville, NC USA 8/2005

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14mz repair

Higher detail pics are available if anyone needs them.

Michael

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05-22-2015 09:07 PM  31 months agoPost 15
Rappii

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Norway

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Tools?

Are the some specific tools need for this job?

Hirobo SDX/Turbulence D3 , Goblin Sab

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HelicopterRadio - Futaba FASST › My Futaba 14mz's right rudder trim switch Fixed...
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