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HelicopterRadio - Servo - Gyro - Gov - Batt › Repairing a JR 8717
09-06-2009 11:27 PM  8 years agoPost 1
cdrking

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Seattle

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I'm rebuilding a used machine and it has 8717's in it. When I went to install the servos I found a servo wiring partially cut. I know the best thing to do would be to send it in but I don't have a lot of time. I'm very comfortable with soldering so that's not an issue. I can cut the wires and then re-solder them to the board. Has anyone ever done this before?

To hover is divine, the alternative is rather PLANE.

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09-06-2009 11:55 PM  8 years agoPost 2
jphilli

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Atlanta, Ga.

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IMO opinion the best thing to do it to cut the wires just past both sides of the break and solder the servo wires to the now .5 cm or so shorter lead.

I've soldered to the board on a 611 before and although I had no problems, I would've felt better about soldering somewhere on the lead itself.

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09-07-2009 12:08 AM  8 years agoPost 3
cdrking

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Seattle

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Unfortunately there's not much wire available. I've cleaned the sticky glue/goo like material off of the solder points. It looks to be a very straight forward solder job. Do you know what the goo like stuff is around the wires? It appears to hold the surrounding wires and the servo wires to the board. It's very sticky.

Thanks,

Jeff

To hover is divine, the alternative is rather PLANE.

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09-07-2009 12:57 AM  8 years agoPost 4
jphilli

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Atlanta, Ga.

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I'm not actually sure what it's called but I know what you're talking about. When I did a the same operation, I just put a dab of shoe-goo over the solder joints afterwards.

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09-07-2009 01:56 AM  8 years agoPost 5
cdrking

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Seattle

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Repair complete. It wasn't that difficult at all. Having a de-soldering tool helps to clean up the old solder and apply some new stuff.

Not my best work but it will work and it will not come off.

To hover is divine, the alternative is rather PLANE.

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09-07-2009 02:26 AM  8 years agoPost 6
TMoore

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Cookeville, TN

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The white stuff is electronics grade RTV. It just provides a little strain relief.

TM

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09-07-2009 03:13 AM  8 years agoPost 7
Dr.Ben

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Richmond, VA, USA

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A spot of GOOP will work if you don't have the E grade RTV.

Ben Minor

Team Synergy Team Futaba Team Kontronik USA
Progressive RC

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09-07-2009 03:35 AM  8 years agoPost 8
cdrking

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Seattle

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Thanks for the input. It may have all been a waste of time. As I said this is a used machine (N9) and it's a disaster. I removed the braided sleeves from the other servo wires and there are cuts and nicks on almost every wire. On one of the servos the previous owner had folded the servo wires to essentially shorten it, he folded it over so tight that the wires almost seem broken. I'm going to recommend that the current owner just send them all in for a good check up and wire replacement.

Also how many tie wraps does it take to put a helicopter together? The answer should be none but this is what I removed.

To hover is divine, the alternative is rather PLANE.

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09-07-2009 04:30 AM  8 years agoPost 9
TMoore

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Cookeville, TN

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I have to comment here. I agree with you, there is just way too much emphasis on neatness. That's way too many wrap ties. You wouldn't even have been able to do maintenance on the machine at some future point and I doubt there was much strain relief. Little velcro straps are a lot better. It may not be as neat but you can't tell when it is flying.

TM

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09-07-2009 04:30 AM  8 years agoPost 10
Dr.Ben

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Richmond, VA, USA

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I feel your pain Jeff. There's little more frustrating than a hack building job which takes nice equipment and needlessly screws it up.

Check that thing carefully. You'll lose sleep wondering about the stuff you can't see just waiting to reach up and bite you on the a$$.

Ben

Team Synergy Team Futaba Team Kontronik USA
Progressive RC

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09-07-2009 06:49 AM  8 years agoPost 11
blbills

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Provo, UT

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Nice job Jeff.

Brian

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09-07-2009 06:55 AM  8 years agoPost 12
cdrking

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Seattle

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Thanks Brian.

This thing was a mess from day one. I have taken every bolt out of this thing and have completely gone\going through it. I have had to use a screw extractor at least 7 times. In 13 or so years building helis I have only used an extractor about 4 times. Some bolts had no loctite and some had so much that I had to either use the extractor or slot the bolt and get the big screw driver from my home owners work bench to get the thing out. Sometimes heat wouldn't even make them budge.

I may need therapy after this one.

Jeff

To hover is divine, the alternative is rather PLANE.

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