PCB murdiya matsala ce ta gama gari a cikin samar da tsari na PCBA, wanda zai kawo tasiri mai yawa ga taro da gwaji.Yadda za a kauce wa wannan matsala, da fatan za a duba ƙasa.
Abubuwan da ke haifar da murdiya PCB sune kamar haka:
1. Zaɓin da ba daidai ba na albarkatun PCB, irin su ƙananan T na PCB, musamman PCB na tushen takarda, wanda zafin jiki na aiki ya yi yawa, PCB ya zama lanƙwasa.
2. Tsarin PCB mara kyau, rarraba ba daidai ba zai haifar da matsanancin damuwa na thermal na PCB, kuma masu haɗawa da kwasfa tare da manyan siffofi kuma za su shafi fadada PCB da raguwa, wanda zai haifar da hargitsi na dindindin.
3. Matsalolin ƙirƙira na PCB, kamar PCB mai gefe biyu, idan foil ɗin tagulla na gefe ya yi girma sosai, kamar waya ta ƙasa, kuma foil ɗin tagulla na ɗaya gefen ya yi ƙanƙara, hakanan zai haifar da raguwar rashin daidaituwa da nakasu a kan. bangarorin biyu.
4. Yin amfani da kayan aiki mara kyau ko nisa ya yi ƙanƙanta sosai, kamarkalaman soldering injiKafar yatsa yana matsewa sosai, PCB zai faɗaɗa da nakasawa saboda zafin walda.
5. Yawan zafin jiki a cikireflow tandawalda zai kuma haifar da murdiya na PCB.
Bisa la’akari da dalilan da suka gabata, mafita sune kamar haka.
1. Idan farashin da sarari sun ba da izini, zaɓi PCB tare da babban Tg ko ƙara kauri na PCB don samun rabo mafi kyau.
2. Zayyana PCB da kyau, yanki na bangon ƙarfe mai gefe biyu ya kamata a daidaita, kuma ya kamata a rufe Layer na jan karfe a inda babu kewaye, kuma ya bayyana a cikin hanyar grid don ƙara ƙarfin PCB.
3. An riga an gasa PCB kafinInjin SMTda 125 ℃/4h.
4. Daidaita tsayin daka ko nisa don tabbatar da sarari don fadada dumama PCB.
5. Welding tsarin zafin jiki a matsayin low kamar yadda zai yiwu, m murdiya ya bayyana, za a iya sanya a cikin sakawa tsayarwa, zazzabi sake saiti, don saki da danniya, gaba ɗaya m sakamakon za a samu.
Lokacin aikawa: Nuwamba-30-2021