Ekukhiqizeni nasekusetshenzisweni kwe-PCBA yezimoto, amanye amabhodi wesifunda adinga ukumbozwa ngethusi.Ukugqoka kwethusi kunganciphisa ngempumelelo umthelela wemikhiqizo yokucubungula isichibi se-SMT ekuthuthukiseni ikhono lokulwa nokuphazamiseka kanye nokunciphisa indawo eyiluphu.Umphumela wayo omuhle ungasetshenziswa ngokugcwele ekucubunguleni isichibi se-SMT.Nokho, kunezinto eziningi okufanele uzinake ngesikhathi sokuthululwa kwethusi.Ake ngethule kini imininingwane yenqubo yokuthela ithusi yokucubungula i-PCBA.
一.Inqubo yokuthulula ithusi
1. Ingxenye yokwelashwa kwangaphambili: Ngaphambi kokuthululwa kwethusi okusemthethweni, ibhodi le-PCB lidinga ukulungiswa, okuhlanganisa ukuhlanzwa, ukususwa kokugqwala, ukuhlanza kanye nezinye izinyathelo zokuqinisekisa ukuhlanzeka nokushelela kwebhodi lebhodi futhi ubeke isisekelo esihle sokuthululelwa kwethusi okusemthethweni.
2. I-electroless copper plating: Ukumboza ungqimba lwe-electroless copper plating liquid ebusweni bebhodi lesifunda ukuze kuhlanganiswe ngamakhemikhali nefoyili yethusi ukuze kwakhiwe ifilimu yethusi kungenye yezindlela ezivame kakhulu zokucwecwa ngethusi.Inzuzo yukuthi ubukhulu nokufana kwefilimu yethusi kungalawulwa kahle.
3. I-Mechanical Copper Plating: Ingaphezulu lebhodi lesifunda limbozwe ungqimba lwe-copper foil ngokucubungula ngomshini.Futhi kungenye yezindlela zokucwenga zethusi, kodwa izindleko zokukhiqiza ziphakeme kune-chemical copper plating, ngakho-ke ungakhetha ukuyisebenzisa ngokwakho.
4. I-Copper coating kanye ne-lamination: Yisinyathelo sokugcina sayo yonke inqubo yokumboza yethusi.Ngemva kokuphothulwa kwe-copper plating, i-foil yethusi idinga ukucindezelwa ebusweni bebhodi lesifunda ukuze kuqinisekiswe ukuhlanganiswa okuphelele, ngaleyo ndlela kuqinisekiswe ukuqhutshwa nokuthembeka komkhiqizo.
二.Indima yethusi enamathela
1. Yehlisa ukuthinta kocingo oluphansi futhi uthuthukise ikhono lokulwa nokuphazamiseka;
2. Yehlisa ukwehla kwamandla kagesi futhi uthuthukise ukusebenza kahle kwamandla;
3. Xhuma ocingweni lwaphansi ukuze unciphise indawo eyiluphu;
三.Izinyathelo zokuphepha zokuthela ithusi
1. Ungathululi ithusi endaweni evulekile ye-wiring engxenyeni ephakathi yebhodi le-multilayer.
2. Ngokuxhunywa kwephuzu elilodwa ngezizathu ezihlukene, indlela iwukuxhuma ngo-0 ohm resistors noma ubuhlalu kazibuthe noma ama-inductors.
3. Uma uqala ukuklama izintambo, ucingo oluphansi kufanele luhanjiswe kahle.Awukwazi ukuthembela ekungezeni i-vias ngemva kokuthela ithusi ukuze ususe izikhonkwane zomhlabathi ezingaxhumekile.
4. Thela ithusi eduze kwe-crystal oscillator.I-crystal oscillator kumjikelezo iwumthombo wokuphuma kwemvamisa ephezulu.Indlela yokuthela ithusi ezungeze i-crystal oscillator, bese ugaya igobolondo le-crystal oscillator ngokuhlukana.
5. Qinisekisa ukujiya nokufana kwesendlalelo sethusi.Ngokuvamile, ukujiya kwesendlalelo se-copper clad kuphakathi kuka-1-2oz.Ungqimba lwethusi oluwugqinsi kakhulu noma oluncane kakhulu luzothinta ukusebenza kwe-conductive kanye nekhwalithi yokudlulisela isignali ye-PCB.Uma ungqimba lwethusi lungalingani, luzobangela ukuphazamiseka nokulahlekelwa amasignali wesifunda ebhodini lesifunda, okuthinta ukusebenza nokuthembeka kwe-PCB.