How do I remove the circuit board from a hitec 7954 servo

[slapjack]

I pulled the bottom of the servo case off and I am assuming the board is soldered directly to the motor so I pulled the top off and removed the gears. Now I am looking at what I believe is the shaft for the motor. I put it against the table and pushed but that board won't pop out the bottom. Am I missing something or do I just need to push harder? I just didn't want to break something. Disregard that. That pin sticking up is just a pin for the top gear to sit on. And u can see the pinion for the motor but it is sitting under a sleeve so u can't push from the top like I thought. No there is another part of the case that maybe comes off on the top side. I can get it to seperate a little but it won't pop off all the way any ideas?

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[I2adioActive]

I just waterproofed mine the other day... In your picture there, between the plastic and metal parts of the case, it will come apart. There are actually 2 sections. Thus, when you have the bottom cover off and split the plastic from the metal, you essentially have access to both sides of the board.

 

[slapjack]

I just waterproofed mine the other day... In your picture there, between the plastic and metal parts of the case, it will come apart. There are actually 2 sections. Thus, when you have the bottom cover off and split the plastic from the metal, you essentially have access to both sides of the board.

Yea I noticed that after I posted it but I couldn't pry that second section off and I didn't wanna crack it. So I just conformal coated the one side of the board then Put a bead of marine grease around the board and on the oring on the bottom and put grease up around the spline too. I think that will do a decent job. I hope anyways. Lol. It has an oring around the spline too. I might give it another try when I get bored tho.

 

[I2adioActive]

Mine was relatively easy to pull apart. I think I used a razor blade to get between the metal and plastic case pieces and it came apart pretty easily. I would recommend it because, aside from the servo motor, its a big chasm in there that leads straight to the exposed top side of the board. I filled it up with liquid electrical tape and did the same on the other (bottom) side of the board before putting it back together. Final step was to pack the upper section where the gears are with marine grease and button it all back up. I haven't tested it yet, aside from making sure it still works. The waterproofing will get put through its paces this weekend though. I like to go swimming with my trucks

 

[slapjack]

Mine was relatively easy to pull apart. I think I used a razor blade to get between the metal and plastic case pieces and it came apart pretty easily. I would recommend it because, aside from the servo motor, its a big chasm in there that leads straight to the exposed top side of the board. I filled it up with liquid electrical tape and did the same on the other (bottom) side of the board before putting it back together. Final step was to pack the upper section where the gears are with marine grease and button it all back up. I haven't tested it yet, aside from making sure it still works. The waterproofing will get put through its paces this weekend though. I like to go swimming with my trucks

I will be taking it apart again soon to redo it. Did you literally fill that whole top cap with grease and smush it back over the gears or did you just put grease on the gears and bunch around the spline? I was going to pack it full but didn't know if it would hinder the gear movement.

 

[I2adioActive]

I packed it pretty full. It does make it a little tougher to turn, but for a servo with 400 oz. of torque, the effect is a drop in the bucket.

 

[slapjack]

I packed it pretty full. It does make it a little tougher to turn, but for a servo with 400 oz. of torque, the effect is a drop in the bucket.

That's true. I am going to pull it back apart and redo the waterproofing.

 

[Creepy Inc.]

If the 7954 is like the 7955 the motor is glued in. You'll break the board off before getting it out, done this twice now...

 

[meatmonkey]

The motor is epoxied to the aluminun section of the case. This makes it difficult, but not impossible to remove. I've removed them by warming the al case a bit with a hair dryer and gently wiggled the motor out with the board. If you plan on playing submarine, which i do, then you will want to fill the cavity hiding above the board. I learned this the hard way so you won't have to.