Methods rau Multimeter Ntsuas ntawm Nco Chips
Muaj 64 cov ntaub ntawv tus pins ntawm lub motherboard thiab lub cim xeeb, D0-D63, txhawm rau tiv thaiv cov ntaub ntawv me ntsis pins ntawm lub cim xeeb, ib qho resistor (10 ohms) nrog tus nqi sib txawv kuj ntxiv rau tag nrho 64 cov ntaub ntawv me ntsis pins D0-D63 kom txwv qhov tam sim no. Lub hauv paus ntsiab lus tseem ceeb ntawm tus tester yog rov sim dua txhua cov ntaub ntawv tus pin ntawm lub cim xeeb nti siv ib qho kev pab cuam, saib seb puas muaj cov ntaub ntawv luv luv luv luv luv pins, nrog rau lub moos pin thiab chaw nyob tus pin ntawm lub nti.
Yog li thaum kuaj chips nrog lub multimeter, txoj kev ntawm tus ntsuas kuj siv tau. Ntev npaum li tus cwj mem liab txuas nrog hauv av (tus pin 1) thiab tus cwj mem dub ntsuas qhov kev tawm tsam ntawm qhov tso tawm, uas yog qhov tsis kam ntawm lub cim xeeb nti cov ntaub ntawv me ntsis, nws tuaj yeem siv los txiav txim siab qhov twg nti tawg. Feem ntau, qhov tsis kam ntawm txhua cov ntaub ntawv me ntsis yog tib yam. Tab sis nws tseem tsis tau paub zoo li tus neeg sim, uas tuaj yeem ntsuas qhov zoo ntawm DDR nco chips siv txoj kev no.
Raws li cov neeg siv phau ntawv qhia, qhov ntsuas ntsuas yog nyob rau hauv 2A thiab 2B, uas yog hais txog ib pawg thiab ob pawg. Tab sis muaj 8 16 me ntsis chips, uas yog sib npaug rau ob pawg, thiab 16 8- ntsis chips, uas yog sib npaug rau ob pawg.
2A yog pab pawg * *, 2B yog pab pawg * *.
Thaum lub sij hawm ntsuas, cov ntaub ntawv me ntsis pins ntawm txhua nti hauv txhua pab pawg yuav raug kuaj cyclically. Feem ntau, yog tias nws tsis tawg tom qab 3 mus rau 5 qhov kev xeem, nws yog qhov zoo. Ib lub chip zoo yog PASS. Ib tug faulty nti qhia faulty cov ntaub ntawv me ntsis pins.
1. Tsis tuaj yeem dhia mus rau hauv qhov kev xeem thaum pib, feem ntau yog vim yog chip luv Circuit Court lossis PCB board luv Circuit Court. Qhov kev daws teeb meem yog tshem tawm cov nti thiab hloov nws nrog lub rooj tsav xwm PCB zoo los kuaj xyuas qhov zoo ntawm cov nti thiab pom tias qhov teeb meem yog dab tsi.
2. Lub cim xeeb tester tsis kuaj SPD chips, SPD chips yog xaiv tau
3. Yog tias tus ntiv tes kub kub, nws tsis tuaj yeem kuaj. Lub nti yuav tsum tau muab tshem tawm thiab hloov ntawm lub rooj tsavxwm PCB zoo los kuaj nws qhov zoo
