Hi all. Recently found a project PCB I wanted to tackle, my first. They had the board design file all ready to go so I sent it off to OSH Park for printing. I was just excited that it uploaded so I really did not check things over. But Now I think I have a problem. There seems to be pads missing from the board in a couple spots. But I am not sure if the original designer used some sort of special fixture and did not need a pad in these spots? Area I am concerned about is where the 12 volt and the 5 volt enter the board.

So here is the schematic:


Here is the Board he built ( Do not have a pic of the back) :


Here is my uploaded board on OSH front and back:



Did I mess up?

 

Hi

there are pins marked +5, GND and Motor voltage,GND. Those are the supply pins. The motor voltage would be 12 v if that’s the voltage rating for your motor..

eT

 

My motor is 12 volts yes. SO there do not seem to be pads at the 4 supply pin holes? Is that correct?

 

And i just noticed the 4 holes in question have an "X" next to them on the schematic. What does that indicate?

 

My motor is 12 volts yes. SO there do not seem to be pads at the 4 supply pin holes? Is that correct?

ok..now I see what you are talking about. Look at board-3.jpg.

there are holes but:
The +supply pads are covered with resist. The ground pads should each have a thermal relief pad and they are missing. Overall, Not a very well designed PCB.

eT

 

Yes, the pads are there, but the information you sent Oshpark probably showed them as via's. There is a difference. Vias can be/are a signal layer. Pads on top for SMD include a a t-stop and t-cream to prevent the resist. Through hole, they also include the bottom equivalents.

1) Scrape off the resist. I would use a fiberglass detail brush available at auto places and probably any place that sells fine finishes. Looks like a twist-able eraser but is made of fine fiberglass stands.
2) Be sure they are connected properly electrically.

In the future, be sure to use a "pad" not a via when designing. They may look the same, unless you have all layers visible. In Eagle, maybe other programs too, you also need to distinguish between something you draw (e.g., a line, circle, rectangle) and something for a signal and name (e.g. a net or polygon).

Edit: As for thermal reliefs for ground pads, sometimes they are left off intentionally. They make soldering a little easier, but their absence does not affect performance negatively.

 

You will need to scrape off the resist around those holes so you can solder pins or wires there.