Los Ua Ke – Vuam qhov rau cov phaj tuaj yeem ua rau muaj kev sib kis; Raws li cov dej ntws tawm, yog li ntawd, cov tooj liab tau raug rau kev kho saum npoo thaum tsim cov txheej txheem, uas yog tom qab ntawd ntxuav.

Thauj khoom – seb nws yog los ntawm cov chaw tsim khoom cog lus (CM) rau koj, lossis los ntawm cov neeg siv khoom lossis cov neeg siv khoom, koj PCB tuaj yeem cuam tshuam los ntawm qhov kub tsis ruaj khov – uas tuaj yeem ua rau cov av noo lossis qhov kub qis – uas tuaj yeem ua rau tawg thiab ua rau tawg. Ib txoj hauv kev los tiv thaiv cov kev hem thawj no yog tiv thaiv lub rooj tsav xwm hauv Circuit nrog txheej txheej lossis lwm yam ntim.

Cia – Tom qab ua haujlwm, koj pawg thawj coj yuav zaum siv sijhawm ntau ntawm kev khaws cia. Yog tias koj tus CM tsis yog, qee qhov yuav yog cov muab kev pabcuam tsim khoom siv ntawm kev tsim thiab sib dhos, tab sis feem ntau yuav ua tiav tom qab sib dhos. Yog li, nws yog qhov yuav tsum tau ua raws cov txheej txheem khaws cia PCB zoo kom ntseeg tau tias koj cov laug cam tau npaj rau siv thaum lawv npaj tau.

Koj yuav tsum paub txog kev paub PCB cia

Kev tiv thaiv tsis pub hnav liab qab (PCB) lossis sib sau ua ke (PCBA) tuaj yeem ua rau muaj kev puas tsuaj. Tsis tas li, yog tias rov tsim cov nqi, tsis xa khoom thiab muaj peev xwm tshem tawm kev xa khoom pib noj rau hauv koj tus nqi xa rov qab, nws yog qhov qhia tau zoo kom kawm tsis txhob lees paub tias yog tias tsis muaj kev tiv thaiv, koj lub rooj tsav xwm hauv Circuit yuav poob qis dua thiab sai dua lub sijhawm. Hmoov zoo, muaj cov kev kho uas, yog tias ua ntawv thov, tuaj yeem txo qhov muaj feem yuav poob ntawm cov laug cam vim kev tuav tsis raug lossis kev coj tsis zoo.

Thawj kauj ruam yog kom ntseeg tau tias koj li CM ua raws li lub rooj tsav xwm zoo tuav thiab khaws cov lus pom zoo; Piv txwv hauv IPC-1601 luam tawm pawg thawj coj saib xyuas thiab khaws cov lus qhia. Cov txheej txheem no muab cov tuam ntxhab thiab cov koom ua ke nrog cov txheej txheem thiab cov ntaub ntawv los tiv thaiv PCBS los ntawm:

pa phem

Txo weldability

Lub cev puas tsuaj

Nqus cov dej noo

Kev tso hluav taws xob electrostatic (ESD)

Ua ke nrog IPC/JEDEC J-STD-033D IPC-1601 tuav, ntim khoom, thauj mus los thiab siv dej noo, rov ua kom rov zoo dua qub thiab cov txheej txheem cuam tshuam cov cuab yeej, IPC muab cov qauv rau ntim thiab khaws cia kom txo qis qhov muaj peev xwm kis tau ntawm lub rooj tsav xwm hauv Circuit kev tsim khoom. Ib qho ntxiv, kev xa khoom xa tuaj thiab cov txheej txheem khaws cia thiab nkag siab txog cov khoom cuam tshuam tuaj yeem siv tau. Lub neej txee ntawm PCB sib sau ua ke teeb tsa cov txheej txheem tseem ceeb PCB cia, raws li qhia hauv qab no.

Cov txheej txheem tseem ceeb PCB cia

Thov ua kom tiav qhov chaw tiav thaum tsim khoom

Cov laug cam yuav tsum tau khaws cia ib ntus tom qab tsim khoom tab sis ua ntej sib dhos. Txhawm rau tiv thaiv kev oxidation thiab kev sib kis nyob rau lub sijhawm no, yuav tsum siv kev kho saum npoo av.

Yog ua tau, siv cov khoom tsis ntub

Cov dej tsis haum SMD cov khoom muaj qhov txwv tsis pub muaj lub neej nyob ntawm qhov kub ≤30 ° C (86 ° F) thiab txheeb ze cov av noo (RH) ≤ 85% ua ntej sib dhos. Yog tias tau ntim khoom kom raug, cov khoom siv no yuav tsum yooj yim tshaj lub npe txee lub neej ntawm 2-10 xyoo tom qab sib dhos. Cheebtsam rhiab rhiab, ntawm qhov tod tes, muaj kev pom zoo cia lub neej ntawm ib hnub rau ib xyoos ntawm kev npaj ua ntej. Rau lub rooj tsav xwm hauv Circuit nrog cov khoom siv no, kev tswj hwm ib puag ncig thiab ntim khoom yuav txiav txim siab nws txoj kev muaj peev xwm.

Khaws lub rooj tsavxwm hauv lub hnab ntim pov thawj (MBB) nrog lub tshuab nqus tsev

Txhua lub rooj zaum yuav tsum tau khaws cia hauv hnab ntim cov dej noo kom tiv thaiv kom tsis txhob ya raws los ntawm lub hnab thiab tiv thaiv kom tsis txhob nqus cov dej noo sab hauv. Txawm li cas los xij, tsis txhob siv hnab uas tau khaws cia ntau dua ib xyoos.

Lub tshuab nqus tsev kaw MBB

MBB yuav tsum qhuav thiab kaw lub tshuab nqus tsev. Qhov no yuav muab kev tiv thaiv zoo li qub.

Tswj ib puag ncig

Kev saib xyuas yuav tsum tau ua kom ntseeg tau tias tsis muaj qhov hloov pauv kub heev thaum lub sijhawm khaws lossis thauj mus los, vim qhov sib txawv ntawm qhov kub tuaj yeem ua rau hloov dej lossis sib xyaw ua ke. Qhov kev xaiv zoo tshaj plaws yog tswj qhov kub ntawm -30 ° C (86 ° F) thiab 85% RH.

Nkoj lossis siv cov laug cam qub tshaj plaws ua ntej

Nws kuj yog ib lub tswv yim zoo uas yuav tsum tau xa ua ntej lossis siv cov laug cam qub kom ua tau zoo kom tsis txhob hnov ​​qab cov laug cam thiab ntau tshaj qhov kev pom zoo txee lub neej.