Iyo 9 pfungwa dzakajairika dzePCB fekitaricircuit board inspection inounzwa sezvinotevera:
1. Izvo zvinorambidzwa zvachose kushandisa pasi bvunzo midziyo kubata mhenyu TV, odhiyo, vhidhiyo uye zvimwe midziyo yepasi ndiro kuedza PCB board pasina yekuzviparadzanisa transformer.
Izvo zvinorambidzwa zvachose kuedza zvakananga TV, odhiyo, vhidhiyo uye zvimwe midziyo isina magetsi ega ega transformer ine zviridzwa uye michina ine yakavharirwa pasi.Kunyangwe iyo general radio cassette rekodha ine simba rekushandura, paunosangana neakanyanya kukosha TV kana odhiyo mudziyo, kunyanya simba rekubuda kana chimiro chemagetsi anoshandiswa, unofanira kutanga waona kuti chassis yemuchina yakachajwa. , kana zvisina kudaro zvichange zviri nyore kwazvo The TV, odhiyo uye zvimwe midziyo inopomerwa neplate yepasi inokonzera pfupi pfupi yemagetsi, iyo inokanganisa dunhu rakabatanidzwa, zvichiita kuti kuwedzera kwechikanganiso kuwedzere.
2. Chenjerera kukushanda kwekudzivirira kwesimbi yesimbi paunenge uchiedza bhodhi rePCB
Hazvibvumirwi kushandisa simbi yakanyungudutswa kuti ishandiswe nesimba.Iva nechokwadi chokuti iron soldering haina kubhadharwa.Gadzira goko resimbi yekusimbisa.Ngwarira nedunhu reMOS.Izvo zvakachengeteka kushandisa yakaderera-voltage yedunhu simbi ye6 ~ 8V.
3. Usati waedza bhodhi rePCB, nzwisisa nheyo yekushanda yemasekete akabatanidzwa uye masekete ane hukama
Usati waongorora nekugadzirisa dunhu rakasanganiswa, unofanirwa kutanga waziva basa redunhu rakasanganiswa rinoshandiswa, dunhu remukati, maparamita makuru emagetsi, basa repini yega yega, uye yakajairika voltage yepini, waveform uye kushanda. musimboti wedunhu rinoumbwa nezvikamu zveperipheral.Kana mamiriro ari pamusoro apa akasangana, kuongorora uye kuongorora kuchava nyore nyore.
4. Usakonzeresa dunhu pfupi pakati pepini paunenge uchiyedza bhodhi rePCB
Pakuyera voltage kana kuyedza waveforms ine oscilloscope probe, usakonzere kupfupika kwedunhu pakati pepini yedunhu rakasanganiswa nekuda kwekutsvedza kweyedzo inotungamira kana probes, uye kuyera parinodhinda redunhu rakabatana nemapini.Chero chenguva pfupi dunhu rinogona kukuvadza zviri nyore dunhu rakabatanidzwa.Iwe unofanirwa kuchenjerera paunenge uchiyedza flat-package CMOS yakabatanidzwa maseketi.
5. Kupikisa kwemukati kwePCB board test instrument inofanira kuva yakakura
Pakuyera DC voltage yeI IC pini, multimeter ine mukati mekudzivirira kwemamita musoro mukuru kudarika 20KΩ/V inofanira kushandiswa, kana zvisina kudaro pachava nekukanganisa kukuru kwekuyera kwemhepo yemamwe mapini.
6. Nyatsocherechedza kupisa kwekupisa kwesimba rakasanganiswa redunhu paunenge uchiedza bhodhi rePCB
Simba rakasanganiswa redunhu rinofanira kuva nekupisa kwakanaka kwekupisa, uye hazvibvumirwi kushanda munzvimbo ine simba guru pasina kupisa kwemvura.
7. Iyo inotungamira waya yePCB board inofanira kuongororwa zvine musoro
Kana iwe uchida kuwedzera ekunze zvikamu kutsiva zvakakanganisika zvedunhu rakasanganiswa, zvidiki zvidiki zvinofanirwa kusarudzwa, uye wiring inofanirwa kudzivirira zvisingaite parasitic coupling, kunyanya kudzika pakati peiyo redhiyo simba amplifier integrated circuit uye preamplifier dunhu kupera. .
8. Kuongorora bhodhi rePCB kuti ive nechokwadi chemhando yewelding
Paunenge uchitengesa, solder yakasimba, uye kuunganidza solder uye pores zvinogona kukonzera kutengesa kwenhema.Nguva yekunyungudutsa kazhinji haipfuure masekonzi matatu, uye simba resimbi yekunyungudutsa rinofanira kunge riri 25W nekudziya kwemukati.Dunhu rakabatanidzwa rakatengeswa rinofanira kunyatsoongororwa.Shandisa ohmmeter kuyera kana pane pfupi pfupi pakati pepini, simbisa kuti hapana solder adhesion, uye wobva wabatidza simba.
9. Usatonga kukanganisa kwedunhu rakabatanidzwa nyore nyore paunenge uchiedzaPCB bhodhi
Usatonga kuti dunhu rakabatanidzwa rinokuvadzwa nyore nyore.Nekuti akawanda maseketi akabatanidzwa akabatana zvakananga, kana dunhu ringove risina kujairika, rinogona kukonzera shanduko yemagetsi akawanda, uye shanduko idzi hadzina kukonzerwa nekukuvadzwa kwedunhu rakabatanidzwa.Mukuwedzera, mune dzimwe nguva, iyo yakayerwa voltage yepini yega yega yakasiyana neyakajairwa voltage.Kana hunhu huchienderana kana padhuze, zvinogona kusagara zvichiratidza kuti dunhu rakasanganiswa rakanaka.Nekuti zvimwe zvinyoro zvinyoro hazvikonzere shanduko muDC voltage.
Musha -About Hengxinyi -Circuit board display -Process parameters -Production flow