The examination method of open a way of FPC open circuit is shared

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Encounter FPC(when us soft board) have open a way / when the problem of open circuit, the simplest method issues an examination to have wireless way in microscope namely (the problem that Trace) ruptures, because FPC is lamina normally, marvelous with respect to three-layer board, circuit can see through optical instrument mostly, arriving nevertheless is the case that has come up against for many times, in the issue that a circuitry cannot examine to rupture below microscope, but use the 3 places that measure golden finger directly with ammeter,be to be able to measure open a way however, or the case that is osculatory stand or fall. Actually, also need not make a fuss of to such result, because FPC is called " soft board " , because its softness can be bent,fold, and the advantage that this also is FPC and defect, defect also is its can be bent fold, because the likelihood brings about Copper Foil circuitry (Copper Trace) ruptures. Although Copper Foil is soft, but again and again repeat a turn to fold or be move back and forth makes a round trip to move or be bumped, bring about its extremely likely still to produce the case that rupture, if be naked eye,can see rupture to consider a look easy to solve, because want to observe the position that rupture only, haply can know the reason that rupture, can take the way to deal with a situation then. More difficult is from most endmost gold finger can be measured / open circuit, how to also seek the seat that is less than Copper Foil to rupture however, cannot find the place, affirming hard is what reason cause rupture. The soft platoon circuitry that analyses this kind of naked eye or microscope to also be aware of hard ruptures when the problem, connect regular meeting to adopt section to eliminate a doctrine. 1.

Observe the line that gives an issue with microscope above all, find first doubtful the positional marked that rupture. 2.

If microscope also cannot find the position that assumes He Ke doubt to rupture, also can distribute line into a few paragraphs small. 3.

The position that ruptures possibly in circuit two end, or the position that is section, take care with bit soft board outer protect film (Cover Film) rift, had better take new art design knife or it is burin, put bit outer layer to protect on film or so shift to blow except layer to protect film next (Cover Film) , make its show the Copper Foil line next. Can take so 3 will measure circuit with ammeter. Eliminate the position that likelihood happening ruptures stage by stage according to foreword next, can find the rupture place with Copper Foil exact circuitry finally. 4.

If fear this method may be right circuitry of strand Copper Foil, also can try to dissection the position that there is Copper Foil by Copper Foil circuitry, try to tear apart next come off outer protect film (Cover Film) , achieve identical goal. (this method need is exceedingly attentive with deft, believe capable PCBA engineer should be OK do get just be been opposite) once find exact Copper Foil circuitry to rupture the position, the phenomenon that if still cannot observe,ruptures, what try to curve this position below microscope is soft board, such OK dash forward show and enlarge ruptures the mouth of Copper Foil. 5.

Once find exact Copper Foil line,rupture the position, the phenomenon that if still cannot observe,ruptures, what try to curve this position below microscope is soft board, such OK dash forward show and enlarge ruptures the mouth of Copper Foil. CNC Milling CNC Machining