Nws yog lub sijhawm rau PCB pawg thawj coj saib xyuas kom ua tib zoo mloog qee cov ntsiab lus txhawm rau npaj ntau dua kom ntseeg tau cov khoom zoo. Thaum kuaj xyuas PCB boards, peb yuav tsum xyuam xim rau cov lus qhia nram qab no 9.

1. Nws yog nruj me ntsis txwv tsis pub siv cov cuab yeej siv hauv av los kov lub TV nyob, suab, video thiab lwm yam khoom siv hauv qab phaj los kuaj PCB pawg thawj coj saib yam tsis muaj qhov hloov pauv hloov pauv.
Nws yog nruj me ntsis txwv tsis pub ncaj qha mus kuaj TV, suab, video thiab lwm yam khoom siv yam tsis muaj lub hwj chim cais transformer nrog cov twj paj nruag thiab cov khoom siv nrog cov plhaub hauv av. Txawm hais tias cov xov tooj cua dav dav hauv xov tooj cua muaj lub zog hloov hluav taws xob, thaum koj tuaj yeem ntsib nrog ntau lub TV tshwj xeeb lossis cov khoom siv suab, tshwj xeeb tshaj yog cov khoom siv hluav taws xob lossis cov khoom siv hluav taws xob siv, koj yuav tsum xub paub seb lub chassis ntawm lub tshuab puas raug them. , txwv tsis pub nws yog qhov yooj yim heev Lub TV, suab thiab lwm yam khoom siv uas raug them nrog lub phaj hauv qab ua rau lub zog luv luv ntawm cov khoom siv hluav taws xob, uas cuam tshuam rau kev sib xyaw ua ke, ua rau muaj kev cuam tshuam ntxiv ntawm qhov txhaum.

2. Ua tib zoo saib xyuas qhov kev ua tau zoo ntawm kev rwb thaiv tsev ntawm cov hlau soldering thaum kuaj PCB board
Nws tsis raug tso cai siv cov hlau soldering rau soldering nrog lub hwj chim. Xyuas kom tseeb tias cov hlau soldering tsis raug them. Nws yog qhov zoo tshaj rau av lub plhaub ntawm cov hlau soldering. Ceev faj ntxiv nrog rau MOS Circuit Court. Nws muaj kev nyab xeeb dua los siv qhov hluav taws xob qis hluav taws xob ntawm 6 ~ 8V.

3. Paub txog lub hauv paus ntsiab lus ntawm kev ua haujlwm ntawm kev sib xyaw ua ke thiab cov khoom siv sib txuas ua ntej kuaj PCB boards
Ua ntej yuav tshuaj xyuas thiab kho qhov sib xyaw ua ke, koj yuav tsum xub paub txog kev ua haujlwm ntawm kev siv hluav taws xob sib xyaw ua ke, kev siv hluav taws xob sab hauv, lub ntsiab hluav taws xob tsis zoo, lub luag haujlwm ntawm txhua tus pin, thiab qhov qub voltage ntawm tus pin, waveform thiab kev ua haujlwm. lub hauv paus ntsiab lus ntawm Circuit Court tsim ntawm peripheral Cheebtsam. Yog tias cov xwm txheej saum toj no tau ua tiav, kev tshuaj xyuas thiab tshuaj xyuas yuav yooj yim dua.

4. Tsis txhob ua rau luv luv ntawm cov pins thaum kuaj PCB
Thaum ntsuas qhov ntsuas hluav taws xob lossis ntsuas qhov nthwv dej nrog kev sojntsuam oscilloscope, tsis txhob ua rau luv luv ntawm cov pins ntawm cov khoom sib txuas vim yog zawv zawg ntawm qhov kev xeem coj lossis kev sojntsuam. Nws yog qhov zoo tshaj plaws los ntsuas ntawm peripheral luam tawm Circuit Court ncaj qha rau cov pins. Txhua lub sijhawm luv luv tuaj yeem ua rau kev puas tsuaj rau kev sib txuas ua ke. Koj yuav tsum tau ceev faj ntau dua thaum kuaj lub tiaj-pob CMOS integrated circuits.

5. Kev tiv thaiv sab hauv ntawm PCB board kuaj ntsuas yuav tsum loj
Thaum ntsuas qhov hluav taws xob DC ntawm IC pins, ib lub ntsuas hluav taws xob nrog lub ntsuas hluav taws xob sab hauv ntawm lub taub hau ntawm lub ntsuas siab siab tshaj 20KΩ / V yuav tsum tau siv, txwv tsis pub yuav muaj qhov yuam kev loj rau qhov voltage ntawm qee tus pins.

6. Ua tib zoo saib xyuas cov cua kub dissipation ntawm lub hwj chim sib xyaw circuits thaum kuaj PCB boards
Lub zog hluav taws xob sib xyaw ua ke yuav tsum dissipate cua sov zoo, thiab nws tsis raug tso cai ua haujlwm hauv lub zog siab yam tsis muaj lub dab dej kub.

7. Cov hlau lead ntawm PCB pawg thawj coj saib yuav tsum tsim nyog
Yog tias koj xav tau ntxiv cov khoom siv sab nraud los hloov qhov puas ntawm qhov sib xyaw ua ke, cov khoom me me yuav tsum raug xaiv, thiab cov xaim yuav tsum tsim nyog kom tsis txhob muaj cov kab mob sib kis tsis zoo, tshwj xeeb tshaj yog hauv av ntawm lub suab lub zog amplifier integrated circuit thiab preamplifier circuit kawg. .

8. Txheeb xyuas PCB pawg thawj coj saib kom ntseeg tau tias qhov vuam zoo
Thaum soldering, lub solder yog ruaj, thiab tsub zuj zuj ntawm solder thiab pores tau yooj yim ua rau cuav soldering. Lub sij hawm soldering feem ntau tsis pub tshaj 3 vib nas this, thiab lub zog ntawm cov hlau soldering yuav tsum yog li 25W nrog cov cua sov sab hauv. Cov kev sib xyaw ua ke uas tau raug soldered yuav tsum tau kuaj xyuas kom zoo. Nws yog qhov zoo tshaj plaws los siv lub ohmmeter los ntsuas seb puas muaj qhov luv luv ntawm cov pins, paub meej tias tsis muaj cov nplaum nplaum, thiab tom qab ntawd tig lub zog.

9. Tsis txhob yooj yim txiav txim siab qhov kev puas tsuaj ntawm kev sib koom ua ke thaum kuaj lub rooj tsav xwm PCB
Tsis txhob txiav txim siab tias qhov kev sib xyaw ua ke yog puas yooj yim. Vim tias feem ntau cov kab hluav taws xob sib xyaw ua ke ncaj qha, ib zaug ib lub voj voog txawv txav, nws yuav ua rau muaj ntau yam kev hloov pauv, thiab cov kev hloov no tsis tas yuav tshwm sim los ntawm kev puas tsuaj ntawm cov kev sib txuas. Tsis tas li ntawd, qee zaum, qhov ntsuas qhov ntsuas hluav taws xob ntawm txhua tus pin yog qhov sib txawv ntawm qhov qub Thaum qhov tseem ceeb sib tw lossis nyob ze, nws yuav tsis yog ib txwm txhais tau tias qhov sib xyaw ua ke zoo. Vim tias qee qhov ua txhaum cai yuav tsis ua rau muaj kev hloov pauv hauv DC voltage.

PCB board debugging txoj kev
Rau lub rooj tsavxwm PCB tshiab uas nyuam qhuav tau muab rov qab los, peb yuav tsum xub ua tib zoo saib seb puas muaj teeb meem ntawm lub rooj tsavxwm, xws li seb puas muaj cov kab nrib pleb, luv circuits, qhib circuits, thiab lwm yam. Yog tias tsim nyog, xyuas seb qhov kev tiv thaiv ntawm cov khoom puas. lub hwj chim mov thiab av yog loj txaus.

Rau lub rooj tsavxwm tsim tshiab, kev debugging feem ntau ntsib qee qhov teeb meem, tshwj xeeb tshaj yog thaum lub rooj tsavxwm loj thiab muaj ntau yam, nws feem ntau tsis tuaj yeem pib. Tab sis yog tias koj paub cov txheej txheem debugging tsim nyog, debugging yuav tau txais ob zaug qhov tshwm sim nrog ib nrab ntawm kev siv zog.

PCB board debugging cov kauj ruam
1. Rau lub rooj tsavxwm PCB tshiab uas nyuam qhuav tau muab rov qab, peb yuav tsum ua ntej ua tib zoo saib seb puas muaj teeb meem ntawm lub rooj tsavxwm, xws li seb puas muaj cov kab nrib pleb, luv Circuit Court, qhib circuits, thiab lwm yam. Yog tias tsim nyog, xyuas seb lub tsis kam ntawm lub hwj chim mov thiab hauv av yog loj txaus.

2. Tom qab ntawd cov khoom raug teeb tsa. Kev ywj pheej modules, yog tias koj tsis paub meej tias lawv ua haujlwm zoo, nws yog qhov zoo tshaj kom tsis txhob nruab tag nrho cov ntawm lawv, tab sis rau nruab ib feem ntawm ib feem (rau cov circuits me me, koj tuaj yeem nruab lawv tag nrho ib zaug), kom nws yooj yim rau nruab. txiav txim siab qhov txhaum. Tsis txhob muaj teeb meem pib thaum koj ntsib teeb meem.

Feem ntau hais lus, koj tuaj yeem nruab lub tshuab hluav taws xob ua ntej, thiab tom qab ntawd siv hluav taws xob los xyuas seb qhov tso zis hluav taws xob ntawm lub zog hluav taws xob puas zoo li qub. Yog tias koj tsis muaj kev ntseeg siab ntau thaum lub zog (txawm tias koj paub tseeb, nws raug nquahu kom koj ntxiv lub fuse, tsuas yog nyob rau hauv rooj plaub), xav txog kev siv cov khoom siv hluav taws xob kho tau nrog kev txwv tam sim no.

Preset lub overcurrent tiv thaiv tam sim no ua ntej, ces maj mam nce tus nqi voltage ntawm cov tswj fais fab mov, thiab saib xyuas cov input tam sim no, input voltage, thiab output voltage. Yog tias tsis muaj kev tiv thaiv overcurrent thiab lwm yam teeb meem thaum lub sij hawm hloov kho, thiab cov zis hluav taws xob tau mus txog qhov qub, lub hwj huam mov yog OK. Txwv tsis pub, tshem tawm cov khoom siv hluav taws xob, nrhiav qhov yuam kev, thiab rov ua cov kauj ruam saum toj no kom txog thaum lub hwj huam mov zoo li qub.

3. Tom ntej no, nruab lwm cov modules maj mam. Txhua zaus ib qho module raug teeb tsa, lub hwj chim rau thiab sim nws. Thaum lub hwj chim rau, ua raws li cov kauj ruam saum toj no kom tsis txhob dhau tam sim no tshwm sim los ntawm kev tsim teeb meem thiab / lossis kev teeb tsa tsis raug thiab hlawv tawm cov khoom.

Txoj hauv kev los nrhiav qhov yuam kev PCB pawg thawj coj saib
1. Nrhiav faulty PCB board los ntawm kev ntsuas voltage txoj kev
Thawj qhov kom paub meej yog seb qhov hluav taws xob ntawm txhua lub zog hluav taws xob tus pin yog qhov qub, tom qab ntawd xyuas seb qhov sib txawv siv hluav taws xob zoo li cas, thiab seb qhov ua haujlwm voltage ntawm txhua qhov chaw yog qhov qub. Piv txwv li, thaum lub dav hlau silicon transistor qhib, BE junction voltage yog hais txog 0.7V, thaum lub CE hlws ris voltage yog hais txog 0.3V los yog tsawg dua. Yog hais tias BE junction voltage ntawm lub transistor ntau dua 0.7V (tshwj tsis yog rau cov transistors tshwj xeeb, xws li Darlington, thiab lwm yam), BE junction yuav qhib.

2. Kev txhaj tshuaj tiv thaiv kab mob txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txiav txim
Ntxiv cov teeb liab qhov chaw mus rau lub input davhlau ya nyob twg, thiab ces ntsuas lub waveform ntawm txhua qhov taw tes nyob rau hauv lem mus saib seb nws puas yog ib txwm mus nrhiav qhov txhaum point. Qee lub sij hawm peb yuav siv txoj kev yooj yim dua, xws li tuav lub tweezers nrog peb txhais tes, kov cov tswv yim terminals ntawm txhua qib kom pom tias cov zis davhlau ya nyob twg teb, uas feem ntau yog siv hauv suab, video thiab lwm yam amplifier circuits (tab sis ceev faj, kub. hauv qab no txoj kev no yuav siv tsis tau rau circuits nrog high voltage los yog high-voltage circuits, txwv tsis pub nws yuav ua rau hluav taws xob poob). Yog tias tsis muaj lus teb rau qib dhau los, tab sis muaj cov lus teb rau qib tom ntej, nws txhais tau tias qhov teeb meem nyob rau qib dhau los thiab yuav tsum tau kuaj xyuas.

3. Lwm txoj hauv kev los nrhiav cov khoom siv PCB yuam kev
Muaj ntau ntau txoj hauv kev los nrhiav cov ntsiab lus txhaum, xws li saib, mloog, hnov ​​​​tsw, kov, thiab lwm yam.
"Saib" yog saib seb puas muaj kev puas tsuaj rau cov khoom siv, xws li tawg, hlawv, deformation, thiab lwm yam;
"Mloog" yog mloog seb lub suab ua haujlwm zoo li cas, piv txwv li, ib yam dab tsi uas yuav tsum tsis txhob nrov yog lub suab nrov, qhov chaw uas yuav tsum tau suab tsis nrov lossis lub suab txawv txav, thiab lwm yam.;
"Smell" yog los xyuas seb puas muaj cov ntxhiab tsw tsw, xws li tsw ntxhiab ntawm qhov kub hnyiab, tsis hnov ​​​​tsw ntawm capacitor electrolyte, thiab lwm yam. Rau cov neeg ua haujlwm kho hluav taws xob uas paub txog, lawv muaj kev nkag siab rau cov ntxhiab tsw;
"Kov" yog ntsuas seb qhov ntsuas kub ntawm lub cuab yeej zoo li cas, piv txwv li, kub dhau lossis txias dhau.

Qee cov khoom siv hluav taws xob yuav ua kom sov thaum lawv ua haujlwm. Yog tias lawv txias rau qhov kov, nws tuaj yeem txiav txim siab tias lawv tsis ua haujlwm. Tab sis yog tias qhov chaw uas yuav tsum tsis txhob kub yog qhov kub los yog qhov chaw uas yuav tsum kub yog kub heev, qhov ntawd yuav tsis ua hauj lwm. General fais fab transistors, voltage regulator chips, thiab lwm yam., ua hauj lwm hauv qab no 70 degrees yog zoo kiag li. Lub tswvyim ntawm 70 degrees yog dab tsi? Yog tias koj nias koj txhais tes, koj tuaj yeem tuav nws ntev dua peb vib nas this, nws txhais tau hais tias qhov kub thiab txias qis dua 70 degrees (nco ntsoov tias koj yuav tsum kov nws ua ntej, thiab tsis txhob hlawv koj txhais tes).