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.