View Full Version : Rewire MR-03 Servo Motor

2016.02.13, 01:54 PM
a lead from my servo motor broke from the board and the wire is so thin it melts when attempting to resolder to the board. any recommendations for rewiring the servo motor? my lead is no to short to even reach the board.

2016.02.13, 04:31 PM
Small coreless motors like the one used for the steering have very fine stranded wire. The insulation is usually melts pretty easy but the wire itself shouldn't unless you're using (really)insane heat. For soldering them I'd recommend a temp of 600F. A quick and delicate touch also helps. Is it possible you're melting only insulation as the wire broke off internally and has pulled out of the insulation when the original failure occurred?

2016.02.13, 05:10 PM
Ray, there are replacements out there. I think I have a spare or two. let me know.

2016.02.13, 05:18 PM
i take it the wire goes into the motor and cannot be replaced?

the lead broke off the board. i attempted to resolder the lead to the board at 700 and the wire/insulation simply melted. it's not a few mm shorter than before and far to short to reach the board.

let me know what i owe you mike. i'll see if i can't repair the this one as well.

2016.02.13, 06:44 PM
Check email

2016.02.20, 11:50 AM
I had that happen a few times as well. Simply handling the board and wiring tends to weaken and break those wires quickly.

I used to use a razor and with a delicate touch, cut away the insulation at a sharp angle along the wire.

Expose a millimeter or 2 of the wire. Then, with the soldering iron, tin the wire by melting some solder on the iron tip and then painting it on the exposed stranded wire to add some strength to the wire before attempting to solder to the board.

With some braided copper, clean out the solder at the original joint on the pcb, so you have a clean hole to insert your wire into, then solder the wire to the board.

Definitely takes practice, and if you have zero soldering experience I would suggest breaking into a throw away device that has a circuit board in it, practice using the iron to manipulate solder. You will learn how the solder loses its flow, and how adding new fresh solder can help. Also, if you have access to flux, I would suggest using it. It is a repair techs best friend, however be careful of the fumes. They are nasty.