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HomeRC & PowerAircraftHelicopterRadio - Servo - Gyro - Gov - Batt › How to replace the servo cable of Futaba BLS 451 servo?
03-10-2012 07:48 AM  6 years agoPost 1
atgrohn

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Europe / Finland

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I managed to damage the servo cable of Futaba BLS 451 and I need to replace it.

I have done this once with older Futaba S3050 servo. It seems that releasing the potentiometer is identical, but

In S3050 the brushed motor is secured with two screws under the servo gears but in BLS451 with brushless motor there are no screws.
Propably the motor in somehow secured from inside...

What actions are needed to completely release the PCB, maybe unsolder the three connections to motor perhaps?

Many Thanks, Antti

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03-10-2012 08:06 AM  6 years agoPost 2
Dood

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Wescanson

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Once you get it apart, you'll find something like this:

That picture is of a 9451
You need to remove the white gunk first.
Desolder the 3 joints very carefully. Use a good hot iron and a very fine soldering tip, being very careful not to bridge any of the three solder points together. If you do, it's not the end of the world, but you will need a solder-sucker tool to remove the solder from the bridge. I made that mistake once because I was in a hurry.

If you have basic soldering skills and a good soldering iron you won't have problems. Good luck and let us know how it works out for you.

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03-10-2012 08:55 AM  6 years agoPost 3
atgrohn

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Thanks for the picture.

My problem is actually how to get that component out from the servo casing. I have unclipped the potentiometer from it's harness but the PCB still refuses to come out. Someting is holding it from the motor end of the PCB.

Something else needed than just brute force?

Antti

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03-10-2012 08:59 AM  6 years agoPost 4
Dood

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Wescanson

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I haven't had a BLS451 apart yet, but I'm pretty sure it's just the 9451's. The white gunk holds the servo in the case. You can see in the picture the white gunk around the motor and how it once was held in place inside the case. It takes some, but doesn't take a lot of force (meaning no tools required) but it will come out with just your fingers.

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03-10-2012 11:29 AM  6 years agoPost 5
atgrohn

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Europe / Finland

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The BLS451 and BLS351 propably have different internal structure than 9451 which is coreless not brushless...

I figured out that on top of the servo there are two holes, you can use e.g. plastic pins and try to push to motor but it won't move.

I think I will next try to desolder the three left most joints (in my picture) and test if the PCB will pop out then...

I also tried contacting the futaba-rc techsupport but they propably won't give me any answers because I live in wrong mainland, I propably should have said I live in States and I'm just dyslexic =)

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03-10-2012 02:56 PM  6 years agoPost 6
Four Stroker

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Atlanta

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When I used to replace pots, I desoldered the motor leads as you suggested. I would suggest desoldering the motor (three big leads) and then pushing the pot out from the top. You may destroy the BLS451 since I don't know how many leads are attached to the motor. If you do, please post some pictures.

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03-10-2012 04:42 PM  6 years agoPost 7
atgrohn

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Europe / Finland

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One option would be to cut open the case from one side and peek what's "happening" inside. New case is only 11 dollars.

I will somehow open it tonight and post some pictures for you.

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03-10-2012 04:54 PM  6 years agoPost 8
Four Stroker

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Atlanta

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If I can count, the motor picture seems to have 6 gray leads in a ribbon cable. Could these be the 3 solder blobs on the top and bottom of the circuit board ? On the other hand, the three pot wires are somewhere.

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03-10-2012 07:36 PM  6 years agoPost 9
atgrohn

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Europe / Finland

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I decided to go with the mechanical demolition

As you can see tons of that white gunk, in my case the motor was stuck until I totally destroyed the case. The ugly thing is that the servo wires originate from second PCB (surface mount contacts). It seems that new wires are rather difficult to solder without first separating the two PCBs...

For me it seems that for reqular hobbyist this servo is rather difficult to service.

If you experiece similar accident with: beer, hobby knife and servo cable as I did, my advice is:

1. Send the servo to Futaba to be serviced
2. Do external joint to servo cable
3. Take extra -100 dollars like a man (buy new one)

Over and out, Antti

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03-10-2012 08:00 PM  6 years agoPost 10
Four Stroker

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Atlanta

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Thanks for posting. I will not bother with trying to replace a pot. Futaba may not actually service them either. If they did, would you want it back ?

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03-10-2012 08:23 PM  6 years agoPost 11
atgrohn

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Europe / Finland

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I totally agree, for most of us this hobby is something else than risking 1000 - 2500 dollars of your money flying in the air (or someone's life) in sake of saving few dollars in case of broken servo.

P.S. I occasionally take few beers when servicing my helis, never on field =)

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