los ntawm Victor W.
Luam Tawm Hauv Rooj Tsav Xwm Circuit Board: Lub Hom Phiaj thiab ib qho Kev Ua
Thaum saib ntawm lub rooj tsav xwm luam tawm uas muaj cov khoom siv ntau, tus neeg nruab nrab yuav txheeb xyuas tag nrho cov chav ua "circuit board." Kev lag luam khoos phis tawj, txawm li cas los xij, hu cov khoom no ua "luam tawm Circuit Board sib dhos" (PCBA). PCBA kuj yog ib qho kev ua. Nws hais txog cov txheej txheem ntawm kev txuas cov khoom sib txuas rau lub rooj tsavxwm.
Qee qhov kev nkag siab ntawm lub rooj sib tham hauv lub rooj sib tham, cov khoom, yuav tsum tau ua ua ntej ib tus tuaj yeem nkag siab li cas PCBAs tau sib sau ua ke. Lub hauv paus ntawm kev sib dhos yog cov ntawv luam tawm Circuit Board (PCB) nrog cov kev sib txuas ntawm cov khoom siv hluav taws xob hu ua kab. Mounted ntawm PCB yog cov khoom sib sau ua ke. Muaj ob pawg tseem ceeb ntawm cov khoom, ntse thiab passive. Cov khoom ntse yog cov chips, tseem hu ua integrated circuits (ICs), uas ua haujlwm zoo ntawm lub teeb-ceev ceev.
Passive Cheebtsam muaj xws li capacitor, resistors, diodes, keyboards thiab transformers. Capacitors khaws cov nqi zoo li qub kom tso tawm thaum lub sijhawm xav tau siab. Resistor txo qhov tam sim no qhov voltage lossis amperage qhov xav tau. Diodes coj cov dej ntws ntawm hluav taws xob mus rau hauv ib txoj kev, thiab cov keyboards tig tam sim no rau thiab tawm. Qee cov PCBs uas tswj fais fab mov muaj transformers thiab coils rau lawv hloov voltage ntawm hluav taws xob.
Kev sib dhos Circuit Court board, qhov kev txiav txim, yog ua tiav los ntawm soldering. Txoj kev siv nyob ntawm ib feem ntawm seb cov khoom puas yuav tsum tau nto mounted lossis los ntawm lub qhov mounted. Ib qho kev sib txuas ntawm qhov chaw (SMC) yog ib qho uas tau txuas rau PCB. Ib feem mounted los ntawm-qhov tshuab technology (THC) muaj leads uas tau muab tso rau hauv lub qhov drilled nyob rau hauv lub luam Circuit Court board los ua ke. Nto mounted Cheebtsam yuav soldered los ntawm yoj los yog reflow soldering txoj kev, los yog tes. Cov khoom ntawm lub qhov tuaj yeem tsuas yog soldered los ntawm nthwv dej lossis los ntawm tes.
Wave los yog reflow soldering ua haujlwm zoo rau cov ntim ntau lawm, thaum siv tes-soldering yog siv rau cov qauv me me. Nyob rau hauv yoj soldering, PCB loaded nrog cov khoom yog hla dhau ib lub twj tso kua mis los yog dej tsaws tsag ntawm solder. Lub solder ntub tag nrho cov cheeb tsam uas raug hlau ntawm PCB tsis tiv thaiv los ntawm lub npog ntsej muag. Tsis ntev los no, nto-mounted Cheebtsam tau dhau los ua nrov nyob rau hauv feem ntau daim ntaub ntawv, yog li reflow soldering tau dhau los ua txoj kev tseem ceeb. Nyob rau hauv reflow soldering, solder paste yog siv los txuas ib ntus los yog ntau yam khoom rau lawv cov ntaub qhwv. Tom ntej no, tag nrho cov sib dhos yog dhau los ntawm lub qhov cub reflow los yog nyob rau hauv ib lub teeb infrared. Qhov no melts lub solder thiab mus tas li txuas qhov sib koom ua ke. Rau cov qauv, tus kws tshaj lij tuaj yeem siv cov khoom siv los ntawm tes los ntawm lub tshuab tsom iav, siv cov tweezers thiab cov hlau nplaum zoo.