Circuit boards thiab cov khoom ntim tau thaum lub vuam txheej txheem, thiab cov teeb meem xws li txias vuam thiab luv circuits raug tsim vim kev ntxhov siab deformation. Warpage feem ntau tshwm sim los ntawm kev kub ntxhov hauv qhov siab thiab qis dua ntawm pawg thawj coj. Rau cov PCBs loj, cov ntaub ntawv tuaj yeem tshwm sim los ntawm lub rooj tswj xyuas kev hnyav. Ordinary PBGA ntaus ntawv yog kwv yees li ntawm 0.5 hli ntawm pawg thawj coj saib kev sib tham. Yog hais tias cov cuab yeej ntawm lub rooj tsav xwm hauv Circuit Court loj loj, lub laub sib tsoo yuav tsum nyob hauv kev ntxhov siab ntev heev li lub rooj tsav xwm hauv tsev txias. Yog hais tias tus ntaus ntawv tau tsa los ntawm 0.1 hli, nws yuav ua kom txaus Welded qhib Circuit Court.
Nyob hauv qhov tsim, thaum lub rooj tsav xwm loj loj loj heev, txawm hais tias lub vuam yooj yim los tswj, cov kab ntawv tau ntev dua, tus impedance yog nce, lub suab nrov tsis dhau lub siab, thiab tus nqi nce; Thaum qhov loj me me, lub cua sov dissipation yog tsawg dua, lub vuam tsis yog yooj yim tswj, thiab cov kab uas nyob ib sab yoojyim tshwm sim. Kev sib cais ntawm kev sib cav, xws li lub electromagnetic cuam tshuam ntawm Circuit Court board. Vim li no, PCB tsim yuav tsum raug kho kom pom zoo: (1) Txeeb cov kev sib txuas ntawm cov khoom siv high-frequency thiab txo EMI cuam tshuam. (2) Cov khoom hnyav (xws li ntau tshaj 20g) yuav tsum tau muab kho los ntawm cov khoom siv thiab tom qab ntawd welded. (3) Lub tshav kub-tsim khoom yuav tsum xav txog qhov teeb meem ntawm lub cev kub los tiv thaiv qhov sib npaug ntawm qhov muaj qhov loj ΔT defect thiab rework, thiab lub tshav kub-rhiab feem ntau yuav tsum nyob deb ntawm qhov chaw ua kom sov. (4) Kev tsim kho ntawm cov cheebtsam yog zoo tib yam li qhov ua tau zoo, uas yog tsis zoo nkauj nkaus xwb, tab sis kuj yooj yim rau cov kab laug sab, thiab cov khoom loj yog qhov zoo dua. Lub rooj tsav xwm Circuit Court yog tsim los kom muaj 4: 3 duab plaub zoo tshaj plaws. Tsis txhob hloov qhov dav ntawm lub xaim kom tsis txhob thaiv kev txuas ntxiv. Thaum lub Rooj Tswjhwm Saib Circuit Court yog lub cua sov ntev ntev, cov ntawv ci khib nyiab loj tuaj thiab ntog tawm. Yog li ntawd, qhov chaw loj tooj liab yuav tsum raug zam.