A cikin tsari nareflow tandakumakalaman soldering inji, PCB hukumar za a nakasa saboda rinjayar daban-daban dalilai, sakamakon matalauta PCBA waldi.Za mu kawai bincika musabbabin lalacewar hukumar PCBA.
1. Zazzabi na PCB jirgin wucewa tanderu
Kowane allon kewayawa zai sami matsakaicin ƙimar TG.Lokacin da yawan zafin jiki na tanda ya yi yawa, sama da matsakaicin ƙimar TG na allon kewayawa, allon zai yi laushi kuma ya haifar da nakasawa.
2. PCB allon
Tare da shaharar fasahar da ba ta da gubar, zafin wutar tanderun ya fi na gubar, kuma buƙatun farantin sun fi girma da girma.Ƙarƙashin ƙimar TG, mafi kusantar allon kewayawa zai iya lalacewa yayin tanderun, amma mafi girman darajar TG, farashin ya fi tsada.
3. Kaurin allon PCBA
Tare da haɓaka samfuran lantarki zuwa ƙanana da madaidaiciyar hanya, kauri na allon kewayawa yana zama ƙarami.Mafi qarancin allon kewayawa shine, nakasar allon yana yiwuwa ya zama sanadin yawan zafin jiki yayin sake walda.
4. Girman allon PCBA da adadin allon
Lokacin da allon kewayawa ya sake yin walda, galibi ana sanya shi cikin sarkar don watsawa.Sarƙoƙi a bangarorin biyu suna aiki azaman wuraren tallafi.Idan girman allon da'irar ya yi yawa ko kuma adadin allunan ya yi girma, yana da sauƙi allon kewayawa ya yi ƙasa zuwa tsakiyar tsakiya, yana haifar da nakasawa.
5. Zurfin V-Cut
V-cut zai lalata tsarin tsarin hukumar.V-yanke zai Yanke tsagi akan babban takarda na asali, kuma zurfin zurfin layin yankan V zai haifar da lalacewar allon PCBA.
6. An rufe allon PCBA da yankin jan ƙarfe mara daidaituwa
A general circuit board design yana da wani babban yanki na tagulla foil don grounding, wani lokacin Vcc Layer ya tsara wani babban yanki na tagulla foil, a lokacin da wadannan manyan wuraren da tagulla ba zai iya ko'ina rarraba a cikin wannan kewaye allon, zai haifar da m zafi kuma. sanyaya gudun, kewaye allon, ba shakka, kuma iya zafi bilges sanyi ji ƙyama, Idan fadada da ƙanƙancewa ba za a iya lokaci guda lalacewa ta hanyar daban-daban danniya da nakasawa, a wannan lokacin idan yawan zafin jiki na hukumar ya kai babba iyaka na TG darajar, allon zai fara yin laushi, wanda zai haifar da nakasu na dindindin.
7. Abubuwan haɗin haɗin yadudduka akan allon PCBA
Hukumar da’ira ta yau tana da allo mai dumbin yawa, akwai wuraren haxawa da yawa, ana raba waxannan wuraren haxawa zuwa rami, rami makaho, bunne rami, waxannan wuraren haxawa za su takaita tasirin faxawar thermal da qanqarewar hukumar da’ira. , wanda ya haifar da nakasar allon.Abubuwan da ke sama sune manyan dalilan nakasar hukumar PCBA.A lokacin sarrafawa da samar da PCBA, ana iya hana waɗannan dalilai kuma ana iya rage nakasar hukumar PCBA yadda ya kamata.
Lokacin aikawa: Oktoba-12-2021