Pamene zida zamagetsi zikuchulukirachulukira, zowonjezera zowonjezera zimafunikira, zomwe zimapangitsa kuti mabwalo ochulukirachulukira komanso zowonjezera pa PCB.Pa nthawi yomweyo, zofunika khalidwe la PCB mkulu panopa cholumikizira ndi bwino.Amass PCB mkulu panopa cholumikizira utenga wofiira mkuwa kukhudzana ndi siliva plating wosanjikiza, amene kwambiri bwino panopa kunyamula ntchito ya PCB mkulu panopa cholumikizira, ndi njira unsembe zosiyanasiyana akhoza kukwaniritsa zosowa unsembe wa makasitomala osiyanasiyana.