Nyob rau hauv PCBA (luam tawm Circuit Court sib dhos) Cov Khoom Siv Ua Si Ntau Lawm Lub hom phiaj tseem ceeb ntawm cov kauj ruam no yog kom tshem tawm cov dej noo nqus sab hauv cov khoom kom tsis txhob muaj teeb meem zoo thaum lub sijhawm ua kom sov siab. Cov hauv qab no yog cov laj thawj tseem ceeb rau cov khoom noj:
1. Tiv thaiv cov "paj ntoo"
Thaum cov av noo rhiab feem pua (xws li BGA, QFN, IC, IC, ETCASE, uas yog hu ua "Florcorn nyhuv". Ci tuaj yeem txo cov av noo thiab tsis txhob muaj kev puas tsuaj ntaus.
2. Txhim Kho Kev Ntseeg Kev Ntseeg
Tom qab PCB substrate lossis cov khoom siv yog noo, cov oxidation lossis wettity ntawm lub ncoo ua rau virtual vuam, txias virtual vuam, txias vuam lossis tin pob tawg. Tom qab ci, saum npoo ntawm cov khoom yog drier, cov cam fluidity yog qhov zoo dua, thiab kev siv vuam zoo dua.
3. Ntsib cov qauv kev lag luam
IPC \/ JEDEC cov qauv, xws li j-std -033, qhia meej kev mob thiab ci tsis muaj cov av noo. Piv txwv li, Cheebtsam nrog cov av noo rhiab (MSL) ntawm Qib 2 lossis siab dua uas tau raug ua kom muaj cua ntev dua li siv.
4. Zam pcb txheej txheej
Tom qab lub substrate ntawm ntau txheej pcb (xws li fry-page pcb (nqus dej noo, cov txheej sab hauv yuav muab sib cais vim yog qhov cua sov ntawm kev kub ntxhov siab. Ci ci tuaj yeem tso cov dej noo hauv lub phaj kom ntseeg tau cov qauv kev ruaj khov.
5. Txhim kho cov txiaj ntsig ntau lawm
Cov ntaub ntawv tsis pom tseeb tuaj yeem ua rau batch tsis xws luag (xws li ntaus ntawv tsis ua haujlwm, pcb deformation) thiab nce cov nqi kho. Ci ua ntej tuaj yeem txo cov kev pheej hmoo ntau ntxiv thiab txhim kho cov txiaj ntsig tag nrho.
