Kusindikizidwa bolodi dera. In addition to collecting dust that can seep into the case of a phone, PCBS are also prone to soaking in or splashing out of liquids during daily use on e-book readers and similar handheld devices. Zotsatira zake, kwatulukira ntchito yothandizira yoyeretsa ndi kukonza ma PCBS owonongeka, koma osawonongeka mu PDAs ndi zida zazikulu.

Cleaning printed circuit boards (PCBS) to repair high-purpose products is as delicate a process as making circuit boards. Ngati njira yolakwika yoyeretsa imagwiritsidwa ntchito, imatha kuwononga kulumikizana, kumasula zida zake ndikuwononga zida. Kuti mupewe zolakwikazi, muyenera kusamala posankha njira yoyenera kuyeretsa monga momwe mumapangira, kupanga, ndikupanga matabwa.

Kodi misampha imeneyi ndi iti? Kodi tingapewe bwanji zimenezi?

Pansipa, tiwunikiranso njira zotsimikizira za PCB ndi zina zomwe simukufuna kugwiritsa ntchito.

Mitundu yosiyanasiyana ya zoipitsa

Mitundu yonse ya zowononga zitha kudziunjikira pa PCBS. Using the right response to an annoying problem will be more effective and will reduce headaches.

Zowononga zowuma (fumbi, dothi)

Chimodzi mwazomwe zimafala kwambiri ndikuti fumbi limasonkhana mkati kapena mozungulira PCB. Gwiritsani ntchito burashi yaying’ono, yosakhwima (monga burashi ya utoto wa akavalo) kuti muchotse fumbi popanda kukhudza zinthu zina. Pali malire pomwe ngakhale burashi yaying’ono kwambiri imatha kufikira, monga pansi pa chigawocho.

Mpweya wopanikizika ukhoza kufikira madera ambiri, koma ukhoza kuwononga kulumikizana kofunikira, chifukwa chake chisamaliro chiyenera kutengedwa mukamagwiritsa ntchito.

A specially designed vacuum cleaner for electronic components is also an option, but it is ubiquitous.

Zonyansa zam’madzi (dothi, mafuta a waxy, flux, soda)

High-temperature operations can turn certain wax-coated components into magnets for dust and dirt, resulting in sticky grime that can’t be removed with a brush or vacuum cleaner. Kupanda kutero, malondawo amakhala ndi soda yomata ndikusokoneza matabwa. Either way, these substances should be addressed before they accumulate and affect performance.

Madontho ambiri amatha kuchotsedwa ndi zotsukira, monga isopropyl mowa (IPA) ndi malangizo a q, maburashi ang’onoang’ono kapena nsalu yoyera ya thonje. Gwiritsani zosungunulira monga IPA kuyeretsa PCB pokhapokha pamalo opumira mpweya, makamaka pamalo otentha.

Mutha kugwiritsa ntchito madzi opangidwa m’malo mwake. Be sure to remove excess moisture and dry the plate properly (a few hours in a low oven will help remove any remaining moisture.)

In addition to IPA, there are many commercially available PCB cleaners, ranging from acetone to chemicals used to clean electronic equipment. Oyeretsa osiyanasiyana amatha kuthana ndi mitundu yonyansa, monga flux kapena sera. Keep in mind that harsh cleaners can remove marks from components or damage plastic or electrolytic capacitor jackets or other exotic components (such as humidity sensors), so make sure that the cleaner you use is not too strong. Ngati mungathe, simuyenera kuyesa oyeretsa pazinthu zakale kapena zolumikizira kuti muwonetsetse kuti simukuwononga kwambiri.

Akupanga PCB kuyeretsa

Kugwiritsa ntchito makina opanga makina opangira pafupipafupi kumayambitsa cavitation. Kukhazikika kwamphamvu kwa mabiliyoni ang’onoang’ono thovu mumayankho oyeretsera omwe ali mu thanki yoyera yopanga. Mitengoyi imapangidwa ndi transducer yolumikizidwa pansi pa thankiyo ndipo amasangalala ndi jenereta pafupipafupi akupanga. Kuphulika kwa thovu kumeneku kumachotsedwa ndi zonyansa kuchokera kumalo oyera a ziwalozo.

Ultrasound imatha kutanthauzidwa ngati mafunde amawu omwe mafupipafupi ali pamtunda wopitilira malire amtundu wamva wamunthu, mwachitsanzo, pafupifupi 20 kHz (20 kHz pamphindikati kapena masekeli 20,000). Inde, phokoso la akupanga zotsukira limamveka panthawi yogwira ntchito chifukwa cha zomwe timatcha akupanga cavitation.

Njirayi imataya zina mwanjira zake monga njira yoyeretsera chifukwa imatha kuwononga zigawo zikuluzikulu kapena kulumikizana kotayirira komanso fumbi ndi dothi. M’malo mwake, NASA yapereka lamulo kuti asagwiritse ntchito kuyeretsa kwa akupanga chifukwa mwina mosazindikira zingapangitse zisoti kumapeto kuti zilekanitse ndikuwononga zingwe zolumikizira mkati mwa IC ndi kupangika kwa akupanga kwa waya wolumikiza mphamvu kudzera mu lead lead ya IC.

Tanena izi, pali malo omwe kugwiritsiridwa ntchito kwa kuyeretsa kwa akupanga. Njira yoyeretsera akupanga imatha kufikira malo ovuta kwambiri, ovuta kufikirako pamsonkhano waukulu kwambiri m’malo ambiri a board board. Izi sizomwe zimachitika ndi zida za SMD zokhala ndi mipata yaying’ono yomwe ndi yocheperako poyerekeza pamagetsi akumwa kwa madzi amadzimadzi. Komabe, njirayi ndiyachangu, ndipo pali makina ambiri okwera kwambiri omwe amatha kuyeretsa kwakukulu.

Makina opangira makina a PCB

Cavitation si njira yofatsa. Zakhala zikuwerengedwa kuti kutentha kopitilira 10,000 ° F ndi zovuta zopitilira 10,000 PSI zipangika pamalo ophulika a thovu.

Oyeretsa akupanga amatha kupanga mafupipafupi kuyambira 25 kHz mpaka 100+ kHz, yoyesedwa mozungulira pamphindikati. Ma frequency otsika amatulutsa thovu lokulirapo poyerekeza ndi ma frequency apamwamba. Mphutsi zazikulu zimaphulika kwambiri, mwachitsanzo kuchotsa zonyansa zonse pazitsulo zopangidwa. Ma frequency apamwamba amapanga ma thovu ang’onoang’ono, ndikupangitsa kutsuka kwa ma bubble kukhala kosavuta koma kotha kulowa m’ming’alu, ming’alu ndi mabowo akhungu. Ma frequency apamwamba amagwiritsidwa ntchito kutsuka malo opukutidwa bwino kapena osalimba.

mapeto

Pali makampani okhazikika pa kuyeretsa kwa PCB. Kutengera zosowa zanu (monga matabwa ambiri, zomwe zimafunika kutsukidwa, komanso momwe matabwawo alili osalimba), mutha kufunafuna gwero loyenera lakunja kuti mukwaniritse zosowa zanu.

Ngati nthawi zambiri mumakhala ndi mavuto ndi matabwa omwe amafunika kuyeretsa, mwina pali zinthu zina zofunika kuziwona pakupanga kapena kupanga.

Kuyeretsa PCBS sikuyenera kukhala ntchito yovuta. Kusunga malangizowo ndi malingaliro pamwambapa kumathandizira kuonetsetsa kuti kuyeretsa kwachitika moyenera.