The reality is that in most cases, any kind of PCB solder mask discoloration is probably cosmetic and does not represent any damage to the board that will affect its functioning. Here is a quick guide to solder mask discoloration.ĭangers of Solder Mask Discoloration on a Circuit Board Whether you observed white patches on a PCB, dark stripe PCB solder mask discoloration or some other type of solder mask discoloration, it’s natural to immediately want to know if the PCB is still good, if the discoloration will cause some kind of problem, what caused it and how to prevent it from happening again. How to avoid making big "non-standard" pads? Just cover pads with polygon with the same signal name, for example, ground pad may be size of auto, but when you cover it with polygon they merge forming big conductive area - this way you have only small pad's copper area exposed for soldering, and remaining space covered by the solder mask.Careful inspection of your printed circuit boards (PCB) may be second nature in your industry, and the first time you saw solder mask discoloration on a circuit board, you may well have been alarmed. To open some space on the solder mask - do not forget that pad is an area uncovered by the mask.I used to do it, it is normal, but as I said if there will be something wrong in the layout at the board level you will get an error. To make its solderable area bigger (most probably not smaller!). Why you may need to change the pad diameter from auto (in other words - from default rules' settings)? Default design rules are defined the way so that you would be more or less easily solder the pins, contact would be good and part would be fixed on the board well. It is a space to put solder into to fixate the component's pin. For advanced EAGLE user it would be ok, but if you are a beginner, you will get lost and hate the tool at the end. The recommendation It should not be changed prevents you making a lot of custom pads and vias which do not comply with settings on that DRC tab, and thus getting a lot of errors which you will have to manually correct in the library editor, or will need to change settings in DRC rules. The related design rules are located in the DRC -> Restring tab, where you can set pads' minimum and maximum diameter, and percentage of their drill diameter. When in library editor, you can change diameter of the pad using info tool in the GUI. Not clear from your question and from documentation - you created device in library editor, then to change this device's pad properties you need to go to library editor, do it there and then update device in the circuit/board you will not be able to make change to pad which is a part of the device in board editor.
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