DRO-550 Construction Guide (rev. 2)
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PCB. Even if the plugs were available, I would still recommend you do the following to get a
solid, reliable connection.
What I recommend is to solder the four wires from the cable directly onto the pads on the scale.
Start by tinning the four pads with solder. You don't want a big puddle of solder but you do want
enough to make a solid connection to the wire on the cables. Next, strip the end of each wire and
attach it to each pad by holding the wire against the pad with one hand and touching the pad with
the solder iron with the other hand. Look at the diagram of the scale jack below to figure out
which wire to solder to which pad. The most important thing here is to hold the wire and scale
as steady as possible so that you get a good, strong solder joint.