Ua ntej koj tuaj yeem daws teeb meem ntawm lub rooj tsav xwm luam tawm (PCB), koj yuav xav tau tshem qee cov khoom ntawm koj lub PC. Nws muaj peev xwm tshem tawm ib qho kev sib koom ua ke (IC) yam tsis muaj kev puas tsuaj rau nws siv qhov chaw nres tsheb kub kub.
Cov cuab yeej tshem tawm IC Nrog Chaw Ua Haujlwm Cua Kub
Solder rework yuav tsum muaj ob peb lub cuab yeej saum toj no thiab dhau ntawm kev teeb tsa yooj yim. Rau cov chips loj, koj yuav xav tau cov khoom siv hluav taws xob hauv qab no:
- Lub tshuab cua kub qhov chaw ua haujlwm rov ua haujlwm (kho qhov kub thiab txias tswj tau yog qhov tseem ceeb)
- Solder paste (rau resoldering)
- A soldering hlau (nrog kev tswj qhov kub thiab txias)
- Tweezers
Cov cuab yeej hauv qab no tsis tsim nyog, tab sis cov no tuaj yeem ua kom rov ua haujlwm yooj yim dua:
- cua kub rework nozzle txuas (tshwj xeeb rau cov chips uas yuav raug tshem tawm)
- Chip-Quik
- Pab kub
- A stereomicroscope
kab hauv qab
Rau ib feem yuav tsum tau soldered mus rau tib lub ncoo raws li cov khoom yav dhau los, koj yuav tsum ua tib zoo npaj qhov chaw rau soldering. Feem ntau, ib qho loj npaum li cas ntawm cov solder tseem nyob ntawm PCB pads, uas ua rau IC tsa thiab tiv thaiv cov pins los ntawm kev sib txuas kom zoo. Yog hais tias lub IC muaj ib lub hauv qab ncoo nyob rau hauv qhov chaw, lub solder muaj peev xwm tsa lub IC los yog tsim ib tug nyuaj-rau-kho cov txuas txuas yog tias nws tau raug thawb tawm thaum lub IC raug nias rau saum npoo. Cov ntaub qhwv tuaj yeem ntxuav tau thiab ua kom nrawm nrawm los ntawm kev hla cov hlau tsis muaj hlau nplaum hla cov ntaub qhwv thiab tshem tawm cov khoom siv ntau dhau.
Yuav ua li cas Siv Chaw Ua Haujlwm Rov Ua Haujlwm rau Kev Kho PCB
Muaj ob peb txoj hauv kev los tshem tawm IC sai sai siv qhov chaw ua haujlwm cua kub. Cov txheej txheem yooj yim yog siv cov cua kub rau cov khoom siv siv lub voj voog kom cov khoom sib txuas ntawm cov khoom melts nyob rau tib lub sijhawm. Thaum lub solder melted, tshem tawm cov khoom nrog ib khub ntawm tweezers.
Lwm cov txheej txheem, uas tshwj xeeb tshaj yog muaj txiaj ntsig zoo rau ICs loj, yog siv Chip-Quik. Qhov no-kub-tsawg-kub solder melts ntawm qhov kub qis dua tus qauv solder. Thaum melted nrog tus qauv solder, nws nyob twj ywm kua rau ob peb feeb, uas muab sij hawm txaus kom tshem tawm IC.
Lwm cov txheej txheem los tshem tawm IC pib nrog lub cev clipping ib tus pins cov khoom uas tau tawm ntawm nws. Clipping tag nrho cov pins tso cai rau IC tshem tawm. Koj tuaj yeem siv cov hlau los yog cov cua kub kom tshem tawm cov seem ntawm cov pins.
Kev phom sij ntawm Solder Rework
Thaum lub tshuab cua kub nyob ruaj khov rau lub sijhawm ntev los ua kom sov ib tus pin lossis lub ncoo, PCB tuaj yeem ua kom sov ntau dhau thiab pib delaminate. Txoj hauv kev zoo tshaj plaws kom tsis txhob muaj qhov no yog ua kom sov cov khoom maj mam kom lub rooj tsavxwm nyob ib puag ncig nws muaj sijhawm ntau los hloov kho qhov kub thiab txias (los yog ua kom sov rau thaj tsam loj ntawm lub rooj tsavxwm nrog lub voj voog ncig). Ua kom sov PCB sai sai zoo li tso lub thawv dej khov rau hauv khob dej sov, yog li zam kom tsis txhob muaj kev ntxhov siab sai thaum ua tau.
Tsis yog txhua yam khoom tuaj yeem tiv taus cua sov uas yuav tsum tau tshem tawm IC. Siv cov ntaub thaiv npog, xws li txhuas ntawv ci, tuaj yeem tiv thaiv qhov chaw nyob ze.
