In PCB production, a plated through-hole can pass the finished-hole diameter check and still cause concern at final inspection. Under magnification, the hole may sit close to one edge of its pad, le...
A dark gap in a plated through-hole cross-section needs a location before it needs a diagnosis. Is copper missing on the barrel wall, at an inner-layer connection or near the hole entrance? The answ...
A drilled hole can look clean at its entrance while resin still covers an inner-layer copper edge inside the barrel. That thin film matters because the later copper deposit needs to meet exposed cop...
In PCB drilling, a via passing the hole diameter inspection does not guarantee that subsequent copper plating processes will be trouble-free. There are usually three main causes: resin smear caused...
