It observes whether the interconnection in the metalized hole is broken and whether or not the glass fabric substrate has delamination. • Insufficient solder: these defects will also be solder-relevant. On the other hand, they generally manifest on account of inadequate wetting of a joint. Inadequate solder defects have an http://hectorukbxt.blogs100.com/8095671/5-essential-elements-for-pcb-testing