Ino inguva yekuteerera kune zvimwe ruzivo mukuonekwa kwe Pcb bhodhi, Kuti ugadzirire zvirinani kuverengera mhando yechigadzirwa. Kana Detective pcb bhodhi, tinofanira kuteerera zvinotevera 9 pfungwa.

1. Zvinorambidzwa zvachose kushandisa hwaro hwepasi bvunzo michina yekubata mhenyu TV, odhiyo, vhidhiyo nemimwe michina pane yepazasi ndiro kuti uone iyo PCB bhodhi isina yekuzviparadzanisa shanduko.

Usayedze zvakananga TV, odhiyo, uye vhidhiyo zvishandiso pasina simba rekuzviparadzanisa ma transformer ane zvigadzirwa zvepasi. Kunyangwe kazhinji rekodhi iine simba shanduri, kana ichionekwa kune yakakosha kunyanya kana hombe kuburitsa simba rehunhu hwesimba remagetsi isingazive zvakawanda nezveTV kana stereo michina, tanga wajekesa muchina chassis inobhadhariswa, zvikasadaro zviri nyore kwazvo uye pasi kurarama TV, odhiyo uye zvimwe zvekushandisa magetsi emagetsi wedunhu, zvakapararira kune yakasanganiswa dunhu, kumwe kuparara.

2. Teerera kune iko kuputira mashandiro emagetsi esimbi simbi kana uchinge waona PCB bhodhi

Hazvibvumirwi kushandisa iron yesimbi ine simba mhenyu. Kuita shuwa kuti iyo simbi yekunamatira haisi kurarama, zvakanakisa kusevha goko redare resimbi. MOS redunhu rinofanira kungwarira, uye zvakachengeteka kushandisa yakaderera-magetsi wedunhu simbi ine 6-8V.

3. Tisati taona bhodhi rePCBB, isu tinofanirwa kunzwisisa musimboti wekushanda wedunhu rakabatana nedunhu rakabatana

Tisati tarisa nekugadzirisa maseketi akabatanidzwa, isu tinofanirwa kutanga taziva nezve mashandiro emaseketi akabatanidzwa, emukati macircuit, makuru magetsi parameter, chinzvimbo chepini imwe neimwe neyakajairika magetsi, waveform yepini uye nesimba rinoshanda redunhu rinoumbwa nedenderedzwa zvikamu. Kana aya mamiriro aripo, kuongorora uye kuongorora zviri nyore kwazvo.

4, bvunzo pcb bhodhi haikonzere ipfupi dunhu pakati pini

Voltage kuyera kana oscilloscope probe test waveform, iyo peni kana probe hazvikonzere ipfupi dunhu pakati pembambo dzedunhu rakabatanidzwa nekuda kwekutsvedza, zvakanakisa kuve zvakabatana zvakananga nemapini enharaunda yekuparadzira wedunhu kuyerwa. Chero chero ipfupi pfupi redunhu inogona kukuvadza nyore nyore iyo INTEGRATED redunhu, saka kumwe kuchengetwa kunofanirwa kutorwa kana uchiyedza zvakapetwa zvakapakirwa zvakavezwa CMOS maseketi akasanganiswa.

5, detection PCB board test instrument internal resistance should be large

Paunenge uchiyera iyo DC voltage yemapini emaseketi akabatanidzwa, shandisa multimeter ine kupikiswa kwemukati kwakakura kudarika 20K ω / V; kana zvisina kudaro, pachave nekukanganisa kukuru kwekuyera kweimwe pini voltages.

6. Teerera kupisa kupisa kwesimba rakabatanidzwa wedunhu kana uchiona PCB bhodhi

Power integrated circuits should have good heat dissipation and should not be allowed to work in a high power state without heat sink.

7, pcb bhodhi kutungamira kuona kunofanirwa kuve kunonzwisisika

Kana zvichidikanwa kuti uwedzere periipheral zvinhu kutsiva chikamu chakakanganisika mukati medunhu rakabatanidzwa, zvidiki zvidiki zvinofanirwa kusarudzwa, uye iyo wiring inofanirwa kuve inonzwisisika kudzivirira zvisina kufanira zvipembenene zvekubatanidza, kunyanya kugadzirisa kupera kwekumisikidza pakati peaudio gudzazwi rakabatanidzwa dunhu uye preamplifier redunhu.

8. Iva nechokwadi chekutenderera kwePCB board

Kana Welding yakanyatso sunganidzwa, iko kuunganidzwa kweiyo solder uye pores zviri nyore kukonzera chaiyo yekutenderera. Nguva yekushambadza kazhinji haina kupfuura masekondi matatu, uye simba resimbi yekunamatira inenge 3W. Iyo yakasanganiswa dunhu yakavezwa kuti inyatsoongorora, zvakanakisa kushandisa ohmmeter kuyera kana paine pfupi dunhu pakati pembambo, simbisa hapana solder adhesion phenomenon uye wobva wabatidza magetsi.

9, kuonekwa kwePCBboard haigone kuona nyore kukuvara kwedunhu rakabatanidzwa

Do not easily judge that the integrated circuit is damaged. Nekuti huwandu hwakawanda hweseketi dzakabatanidzwa dzakanangana zvakananga, kana dunhu risina kujairika, zvinogona kutungamira mukuchinja kwakawanda kwemagetsi, uye shanduko idzi hadzikonzerwe nekukuvara kwedunhu rakabatanidzwa, uye mune dzimwe nguva, iyo yakayerwa pini voltage iri inoenderana kana padyo neyakajairika kukosha, zvinogona kutadza kuratidza kuti dunhu rakabatanidzwa rakanaka. Nekuti zvimwe zvakapfava zvikanganiso hazvikonzere shanduko muDC voltage.

PCB board debugging method

Kune iyo nyowani pcb board yakangodzoserwa kumashure, isu tinofanirwa kutanga tangotarisa kana paine matambudziko pabhodhi, senge paine kutsemuka kuri pachena, kungave kune pfupi dunhu, yakavhurika redunhu uye zvimwe zviitiko. If necessary, check that the resistance between the power supply and the ground is large enough.

Kune iro richangobva kugadzirirwa redunhu bhodhi, kukanganisa kazhinji kunosangana nemamwe matambudziko, kunyanya kana bhodhi iri hombe, zvimwe zvinhu, kazhinji vasingazive mavambo. Asi kana iwe uchiziva nzira inonzwisisika yekugadzirisa, kugadzirisa dambudziko kunowana zvakapetwa kaviri nehafu yekuedza.

Pcb bhodhi debugging maitiro

1. For the new PCB board just brought back, we should first roughly observe whether there are problems on the board, such as whether there are obvious cracks, whether there are short circuits, open circuits and other phenomena. If necessary, check that the resistance between the power supply and the ground is large enough.

2, uyezve izvo zvekuisa zvikamu. Ma Independent module, kana usinga vone kuti anoshanda nemazvo, zviri nani kuti usaise ese, asi chikamu chekumisikidza (kumatunhu madiki, anogona kuiswa zvese kamwechete), kuti zvive nyore kuona iko kukanganisa range, kuitira kuti kana ukasangana nematambudziko, usazive kuti wotanga sei.

Generally speaking, you can install the power supply part first, and then check whether the power supply output voltage is normal. Kana usiri kunyatsoziva kana uchimisa (kunyangwe kana uri, iwe unorayirwa kuti uwedzere fiyuzi, zvingangoitika), unogona kufunga nezve kushandisa inogadzirisirwa voltage regulator neazvino kudzikisira basa.

Chekutanga kuseta dziviriro yazvino, uyezve kukosha kwemagetsi kwesimba regadziri kunopa zvishoma nezvishoma, uye kuongorora iko ikozvino kuisa, magetsi ekuisa uye kubuda kwemhepo. If no overcurrent protection occurs and the output voltage is normal, the power supply is OK. Zvikasadaro, bvisa magetsi, tsvaga iko kukanganisa, uye dzokorora matanho ari pamusoro kusvikira magetsi awanzo.

3, wobva waisa zvishoma nezvishoma mamwe ma module, module yega yega yakaiswa, simba pabvunzo, simba pane zvinoenderana nematanho ari pamusoro, kuitira kudzivirira kuwanda uye kupisa zvinhu nekuda kwekukanganisa dhizaini kana kukanganisa kwekuisa.

Tsvaga mhinduro yeakaremara pcb board

1. Kuyera voltage kuwana vakakanganisa pcb bhodhi

Chinhu chekutanga kusimbisa ndechekuti iwo magetsi echip chipini pini akajairika, uyezve tarisa kana ese marudzi ereferenzi voltage ari akajairika, uye kana iwo unoshanda voltage yeimwe poindi yakajairika. Chairo silicon triode, semuenzaniso, ichave ine BE junction voltage yeinotenderedza 0.7V uye neEC junction voltage yeakakomberedza 0.3V kana mashoma. Kana triode iine BE junction voltage yakakura kupfuura 0.7V (kunze kwematatu akakosha senge Darlington machubhu), iyo BE junction inogona kunge yakavhurika.

2, chiratidzo jekiseni nzira yekuwana mhosva pcb bhodhi

Add the signal source to the input end, and then measure the waveform of each point in turn to see whether it is normal to find the fault point. Dzimwe nguva isu tinoshandisa zvakare nzira yakapusa, senge kubata tweezer kuti tibate yekuisa terminal kumatunhu ese kuti tione kana paine mhinduro pane inobuda terminal, iyo inowanzo shandiswa mune odhiyo uye vhidhiyo gudzazwi maseketi (asi zvinofanirwa kucherechedzwa kuti nzira iyi haigone kushandiswa mumatunhu ane hot base mapureti kana akakwira magetsi maseketi, zvikasadaro inogona kutungamira kumagetsi kushamisika). Kana pasina chekuita pamberi pekubata, uye paine chiitiko mushure mekubata, zvinoratidza kuti dambudziko riri padanho rapfuura, rinofanirwa kutarisa pakuongorora.

3. Dzimwe nzira dzekutsvaga dzakakanganisika mabhodhi ePBB

There are many other ways to find trouble spots, such as seeing, hearing, smelling, and touching.

“Tarisa” ndiko kuona kana paine zviri pachena mehendi kukuvara kwezvinhu, zvakadai sekuputika, kusviba, deformation, nezvimwe.

“Teerera” kuteerera kuti kurira kwebasa kwakajairika, senge zvimwe zvinhu hazvifanire kurira mhete, mhete haina kurira kana kurira kwacho hakuna kujairika;

“Hwema” kutarisa kana paine munhuwi, senge munhuwi wekupisa, capacitor electrolyte kuravira, kune vane ruzivo zvemagetsi ekugadzirisa vashandi, inonyatsonzwa kune idzi hwema;

“Touch” is to use the hand to test whether the temperature of the device is normal, such as too hot, or too cold.

Mimwe michina yemagetsi, kana ichishanda, kupisa, kana kuchitonhora kusvika pakubata, unogona kutonga kuti haishande. But if it’s hot where it shouldn’t be or too hot where it should be, that’s no good. General power triode, voltage regulator chip, etc., working in 70 degrees is completely no problem. Zvinorevei 70 degrees? If you can hold your hand on it for more than three seconds, the temperature is probably below 70 degrees (be careful not to burn your hand).