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| PCB circuit board solder resist film has little to do VIA HOLES stop point, but there is always have a hole with green paint, what is the reason? |
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In fact, the block must point to deal when the ink on the printed circuit board to be done , or when it into the holes, especially holes, because the relationship between baking, ink wells hardened to a certain extent, when the developer simply has been washed out and it said operators see the light is useless, therefore beforehand to prevent the ink enter ,this is only with reference
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