Kab lus no feem ntau qhia txog peb yam kev phom sij ntawm kev siv PCB tas sij hawm.
01
PCB tas sij hawm tuaj yeem ua rau oxidation saum npoo
Oxidation ntawm cov ntaub qhwv ntsej muag yuav ua rau cov khoom tsis zoo, uas tuaj yeem ua rau kev ua haujlwm tsis ua haujlwm lossis kev pheej hmoo ntawm kev poob. Kev kho deg sib txawv ntawm cov rooj sib tham hauv Circuit Court yuav muaj qhov sib txawv los tiv thaiv oxidation. Raws li txoj cai, ENIG xav kom nws siv li ntawm 12 lub hlis, thaum OSP xav kom nws siv li ntawm rau lub hlis. Nws raug nquahu kom ua raws li lub txee lub neej ntawm PCB pawg thawj coj saib lub Hoobkas (lub neej txee) kom ntseeg tau zoo.
OSP boards feem ntau tuaj yeem xa rov qab mus rau lub rooj tsavxwm lub Hoobkas kom ntxuav tawm OSP zaj duab xis thiab rov ua dua txheej txheej tshiab ntawm OSP, tab sis muaj lub caij nyoog uas cov ntawv ci tooj liab yuav raug puas tsuaj thaum OSP raug tshem tawm los ntawm pickling, yog li nws. Nws yog qhov zoo tshaj plaws hu rau lub koom haum pawg thawj coj saib xyuas kom paub meej tias OSP zaj duab xis puas tuaj yeem rov ua dua.
ENIG boards tsis tuaj yeem rov ua dua. Nws yog feem ntau pom zoo kom ua "nias-baking" thiab tom qab ntawd sim seb puas muaj teeb meem nrog lub solderability.
02
PCB tas sij hawm tuaj yeem nqus cov dej noo thiab ua rau lub rooj sib tsoo tawg
Lub rooj tsav xwm hauv Circuit Court tej zaum yuav ua rau cov paj kws, tawg lossis delamination thaum lub rooj tsav xwm hauv Circuit Court undergoes reflow tom qab nqus noo noo. Txawm hais tias qhov teeb meem no tuaj yeem daws tau los ntawm kev ci, tsis yog txhua yam ntawm lub rooj tsavxwm tsim nyog rau kev ci, thiab ci yuav ua rau lwm yam teeb meem zoo.
Feem ntau hais lus, OSP pawg thawj coj saib tsis pom zoo kom ci, vim tias qhov kub kub yuav ua rau OSP zaj duab xis puas, tab sis qee cov neeg kuj tau pom cov neeg siv OSP ci, tab sis lub sij hawm ci yuav tsum luv li sai tau, thiab qhov kub yuav tsum tsis txhob. siab dhau lawm. Nws yog ib qho tsim nyog los ua kom tiav lub reflow rauv nyob rau hauv lub sij hawm luv tshaj, uas yog ib tug ntau ntawm cov kev cov nyom, txwv tsis pub lub solder pad yuav oxidized thiab cuam tshuam rau vuam.
03
Lub peev xwm sib txuas ntawm PCB tas sij hawm tuaj yeem degrade thiab deteriorate
Tom qab lub Circuit Court board raug tsim, lub peev xwm sib txuas ntawm cov txheej (txheej rau txheej) yuav maj mam degrade los yog txawm deteriorate nyob rau hauv lub sij hawm, uas txhais tau hais tias raws li lub sij hawm nce, lub bonding quab yuam ntawm cov khaubncaws sab nraud povtseg ntawm lub Circuit Court board yuav maj mam txo.
Thaum xws li lub rooj tsav xwm Circuit Court raug kub siab nyob rau hauv lub reflow rauv, vim hais tias Circuit Court boards muaj xws li cov ntaub ntawv sib txawv muaj sib txawv thermal expansion coefficients, nyob rau hauv qhov kev txiav txim ntawm thermal expansion thiab contraction, nws yuav ua rau de-lamination thiab npuas npuas. Qhov no yuav cuam tshuam rau kev ntseeg siab thiab kev cia siab rau lub sijhawm ntev ntawm lub rooj tsavxwm Circuit Court, vim hais tias delamination ntawm lub rooj tsavxwm Circuit Court yuav ua rau lub vias ntawm cov khaubncaws sab nraud povtseg ntawm lub rooj tsavxwm Circuit Court, uas ua rau cov khoom siv hluav taws xob tsis zoo. Qhov teeb meem feem ntau yog Cov teeb meem tsis zoo tshwm sim tuaj yeem tshwm sim, thiab nws yuav ua rau CAF (micro short circuit) tsis paub txog.
Kev puas tsuaj ntawm kev siv cov PCBs tas sij hawm tseem loj heev, yog li cov neeg tsim qauv tseem yuav tsum siv PCBs nyob rau lub sijhawm kawg yav tom ntej.