Capacitance yog ib qho ntawm cov khoom siv ntawm SMD ua, qhov pib ntawm txhua lub PCBA board yog them nrog ntau hom capacitors, lub luag haujlwm rau kev ua haujlwm sib txawv.
Muaj ntau ntau hom capacitors, nyob rau hauv cov txheej txheem kev tso kawm SMT, feem ntau ntawm lawv yog nti capacitors.
SMD capacitters hauv SMT cov txheej txheem tso chaw yog ib qho tsis zoo yog khoob (tseem hu ua cuav ham).
Niaj hnub no peb yuav tham nrog koj txog cov chip processing capacitors tshwm sim npliag solder ua rau thiab tiv thaiv.
PCB pads tau txais me me thiab me, yog li cov kev cai luam ntawv raug tau siab dua thiab siab dua, solder paste luam tawm offset (hauv cov neeg ua haujlwm cov ntsiab lus tsis tau luam tawm ntawm lub ncoo lossis offset ntau, tsuas yog luam tawm rau ib feem ntawm lub ncoo), uas yuav ua rau reflow soldering, ib feem ntawm lub solder muab tshuaj txhuam melting, thiab lwm yam ntawm cov muab tshuaj txhuam melting lub sij hawm ntev dua thiab tsis tag melted kom cov khoom nkag mus tin tsau, uas ua rau cov tsos ntawm khoob solder, cuav solder tsis zoo.
Vim li no ua rau qhov kev ntsuas yuav tsum tau txhim kho qhov zoo ntawm solder paste printing, Z yog zoo nyob rau hauv solder paste tshuab luam ntawv tom qab ib tug ntxiv SPI (tshwj xeeb rau kev kuaj xyuas qhov zoo ntawm solder paste printing).
Lub tshuab mount muaj kev txhawj xeeb txog qhov ceev thiab qhov tseeb ntawm lub mount, qhov precision yog hais txog cov khoom siv tus lej mount rau pcb ncoo ntsis tus lej saum toj no, qee qhov mount tshuab mount precision tsis zoo, muaj qee qhov mount offset ces yuav ua rau tshwm sim. npliag solder.
Countermeasure: txo qhov kev tso kawm nrawm lossis hloov qhov kev tso kawm precision siab dua qhov kev tso kawm tshuab.
Reflow soldering yog plaub qhov chaw kub, nyob rau hauv thaj tsam soldering yog qhov kub Z siab, qhov kub ntawm qhov chaw no yuav pad rau ntawm cov tshuaj nplaum yog yaj kom cov khoom nce tin, qee cov khoom siv hluav taws xob qee qhov me me, thiab qee qhov loj, yuav ua tau mus rau qhov tsis sib xws cua sov, yaj lub sij hawm tin tsis zoo ib yam, yog li ua rau khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob.
Countermeasures: filtering time and furnace temperature curve settings, should be used to test the furnace temperature tester, in the prototype stage to do more than the first test OK board.
SMD processing capacitor khoob soldering yuav tsum tau them sai sai rau, thiaj li tsis cuam tshuam rau lub peev xwm thiab cov neeg siv khoom tsis txaus siab.
