Los ntawm PCB World.

Txawm hais tias nws yog ib lub rooj tsavxwm ua los ntawm lwm tus neeg lossis PCB board tsim thiab tsim los ntawm koj tus kheej, thawj qhov uas yuav tau txais nws yog los xyuas qhov tseeb ntawm lub rooj tsavxwm, xws li tinning, tawg, luv Circuit Court, qhib circuits, thiab drilling.Yog tias lub rooj tsavxwm zoo dua Ua kom nruj, ces koj tuaj yeem kuaj xyuas tus nqi ntawm cov khoom siv hluav taws xob thiab cov xaim hauv av los ntawm txoj kev.

Raws li ib txwm muaj, lub rooj tsavxwm ua tus kheej yuav nruab cov khoom tom qab tinning tiav, thiab yog tias tib neeg ua nws, nws tsuas yog ib qho khoob tinned PCB board nrog qhov.Koj yuav tsum tau nruab cov khoom koj tus kheej thaum koj tau txais..

Qee tus neeg muaj cov ntaub ntawv ntau ntxiv txog PCB pawg thawj coj saib lawv tsim, yog li lawv nyiam sim txhua yam khoom ib zaug.Qhov tseeb, nws yog qhov zoo tshaj los ua nws me ntsis.

PCB Circuit Board nyob rau hauv debugging
Tshiab PCB board debugging tuaj yeem pib los ntawm cov khoom siv hluav taws xob.Txoj kev nyab xeeb tshaj plaws yog muab lub fuse thiab tom qab ntawd txuas cov khoom siv hluav taws xob (tsuas yog, nws yog qhov zoo tshaj plaws los siv lub zog ruaj khov).

Siv cov khoom siv hluav taws xob ruaj khov los teeb tsa qhov kev tiv thaiv overcurrent tam sim no, thiab tom qab ntawd maj mam nce qhov voltage ntawm cov khoom siv hluav taws xob ruaj khov.Cov txheej txheem no yuav tsum tau saib xyuas cov tswv yim tam sim no, cov khoom siv hluav taws xob thiab cov zis hluav taws xob ntawm lub rooj tsavxwm.

Thaum qhov hluav taws xob tau hloov kho siab, tsis muaj kev tiv thaiv dhau tam sim no thiab cov zis hluav taws xob yog qhov qub, ces nws txhais tau tias lub hwj chim ntawm lub rooj tsavxwm tsis muaj teeb meem.Yog tias qhov kev tso tawm ib txwm muaj hluav taws xob lossis kev tiv thaiv dhau tam sim no dhau, ces qhov ua rau ntawm qhov txhaum yuav tsum raug tshawb xyuas.

Lub installation ntawm Circuit Board
Maj mam nruab cov modules thaum lub sij hawm debugging txheej txheem.Thaum txhua qhov module lossis ob peb lub modules raug teeb tsa, ua raws li cov kauj ruam saum toj no los ntsuas, uas yuav pab kom tsis txhob muaj qee qhov yuam kev thaum pib ntawm kev tsim, lossis kev teeb tsa tsis raug ntawm cov khoom, uas tuaj yeem ua rau kub hnyiab dhau.Cov khoom tsis zoo.

Yog tias qhov tsis ua haujlwm tshwm sim thaum lub sijhawm teeb tsa, cov hauv qab no feem ntau siv los daws teeb meem:

Txoj kev daws teeb meem ib qho: txoj kev ntsuas hluav taws xob.

Thaum muaj kev tiv thaiv dhau tam sim no, tsis txhob maj mus rau disassemble lub Cheebtsam, thawj zaug paub meej tias lub zog hluav taws xob pin voltage ntawm txhua nti kom pom tias nws nyob hauv qhov qub.Tom qab ntawd xyuas qhov siv voltage, ua haujlwm voltage, thiab lwm yam nyob rau hauv lem.

Piv txwv li, thaum lub silicon transistor qhib, qhov voltage ntawm BE junction yuav nyob ib ncig ntawm 0.7V, thiab CE junction feem ntau yog 0.3V los yog tsawg dua.

Thaum kuaj, nws pom tias BE junction voltage siab dua 0.7V (tshwj xeeb transistors xws li Darlington tsis suav nrog), ces nws muaj peev xwm hais tias BE junction yog qhib.Ua ntu zus, xyuas qhov voltage ntawm txhua qhov taw tes kom tshem tawm qhov txhaum.

Troubleshooting method two: signal injection method

Txoj kev teeb liab txhaj tshuaj yog teeb meem ntau dua li ntsuas qhov voltage.Thaum lub teeb liab qhov chaw raug xa mus rau lub input davhlau ya nyob twg, peb yuav tsum ntsuas lub waveform ntawm txhua taw tes nyob rau hauv lem mus nrhiav qhov txhaum point nyob rau hauv lub waveform.

Tau kawg, koj tuaj yeem siv cov tweezers txhawm rau txhawm rau txhawm rau nkag mus rau lub davhlau ya nyob twg.Txoj kev yog kov lub input davhlau ya nyob twg nrog tweezers, thiab tom qab ntawd soj ntsuam cov lus teb ntawm lub davhlau ya nyob twg input.Feem ntau, txoj kev no yog siv nyob rau hauv cov ntaub ntawv ntawm lub suab thiab video amplifier circuits (ceeb toom: kub pem teb Circuit Court thiab high voltage Circuit Court) Tsis txhob siv txoj kev no, nws yog feem ntau ua rau hluav taws xob shocks).

Txoj kev no pom tias theem dhau los yog qhov qub thiab theem tom ntej teb, yog li qhov txhaum tsis nyob rau theem tom ntej, tab sis nyob rau theem dhau los.

Txoj kev daws teeb meem peb: lwm yam

Ob qho saum toj no yog qhov yooj yim thiab ncaj qha txoj kev.Tsis tas li ntawd, piv txwv li, pom, hnov ​​tsw, mloog, kov, thiab lwm yam, uas feem ntau hais, yog cov engineers uas xav tau qee qhov kev paub dhau los txhawm rau txhawm rau txheeb xyuas cov teeb meem.

Feem ntau, "saib" tsis yog saib lub xeev ntawm cov khoom siv kuaj, tab sis saib seb qhov zoo li ntawm cov khoom tiav;"sm" feem ntau yog hais txog seb cov ntxhiab tsw ntawm cov khoom puas txawv txav, xws li tsis hnov ​​​​tsw ntawm qhov kub hnyiab, electrolyte, thiab lwm yam. Cov khoom siv dav dav yog nyob rau hauv thaum puas lawm, nws yuav ua rau tsis hnov ​​tsw ntawm hlawv.

Thiab "kev mloog" feem ntau yog mloog seb lub suab ntawm pawg thawj coj saib puas yog ib txwm nyob hauv kev ua haujlwm;Hais txog "kov", nws tsis yog kov seb cov khoom puas yog xoob, tab sis xav tias qhov kub ntawm cov khoom yog qhov qub los ntawm tes, piv txwv li, nws yuav tsum txias hauv kev ua haujlwm.Cov Cheebtsam yog kub, tab sis cov khoom kub yog txawv txav.Tsis txhob rub nws nrog koj txhais tes ncaj qha thaum lub sij hawm kov cov txheej txheem los tiv thaiv tes los ntawm kub kub.