Kitapo boribory vita pirinty, indrindra ireo izay ampiasaina amin’ny PDA (mpanampy nomerika manokana) toy ny finday, dia iharan’ny herisetra. 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. Vokatr’izany dia nipoitra ny indostrian’ny serivisy izay manome serivisy fanadiovana sy fanamboarana ho an’ny PCBS voaloto, saingy tsy misy fahasimbana ara-batana amin’ny PDA sy fitaovana lehibe.

Cleaning printed circuit boards (PCBS) to repair high-purpose products is as delicate a process as making circuit boards. Raha ny fomba fanadiovana diso no ampiasaina dia mety hanimba ny fifandraisana izany, hamaha ny singa ary ny fitaovana simba. To avoid these defects, you need to take as much care in choosing the right cleaning method as you do in designing, specifying, and manufacturing boards.

Inona avy ireo fandrika ireo? How can they be avoided?

Etsy ambany, hizaha ireo safidy fanadiovana PCB voaporofo ary ny sasany izay mety tsy tianao hampiasaina.

Karazan-javatra maloto isan-karazany

All kinds of pollutants can accumulate on PCBS. Using the right response to an annoying problem will be more effective and will reduce headaches.

Loto maloto (vovoka, loto)

Ny iray amin’ireo fepetra mahazatra indrindra dia ny vovoka miangona ao na manodidina ny PCB. Mampiasà moramora borosy kely malefaka (toy ny borosin-tsoavaly) mba hanesorana vovoka nefa tsy hisy fiantraikany amin’ny singa. There is a limit to where even the smallest brush can reach, such as under the component.

Ny rivotra voafehy dia mety hahatratra faritra maro, fa mety hanimba ny fifandraisana manan-danja, noho izany dia tokony hitandremana rehefa mampiasa azy io.

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

Mandoto mando (loto, menaka savoka, tsiranoka, 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. Raha tsy izany dia hahazo soda miraikitra ny vokatra ary hanakorontana ireo tabilao. Either way, these substances should be addressed before they accumulate and affect performance.

Ny ankamaroan’ny tasy dia azo esorina amin’ny mpanadio, toy ny alikaola isopropyl (IPA) sy Q-tip, borosy kely na lamba landihazo madio. Mampiasà solvents toy ny IPA mba hanadiovana ny PCB amin’ny tontolo misy rivotra ihany, tsara kokoa amin’ny fofona setroka.

You can use deionized water instead. 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. Ny mpanadio isan-karazany dia afaka miatrika karazana loto manokana, toy ny flx na savoka. 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. Raha azonao atao, dia tsy mila mizaha toetra ny mpanadio amin’ny singa efa tranainy na mpampitohy ianao mba hahazoana antoka fa tsy manimba be loatra ianao.

Ultrasonic PCB cleaning

The use of high frequency ultrasonic cleaning machine causes cavitation. The violent implosion of billions of tiny bubbles in the cleaning solution contained in the ultrasonic cleaner tank. The bubbles are generated by a transducer attached to the bottom of the tank and are excited by the generator at an ultrasonic frequency. Ny fipoahan’ireto bubble ireto dia ho entin’ny loto amin’ny loto maloto amin’ireo faritra.

Ny ultrasound dia azo faritana ho onjam-peo izay ny refesiny dia mihoatra ny fetra farany ambony amin’ny haben’ny fihainoana ataon’ny olombelona, ​​izany hoe 20 kHz eo ho eo (20 kHz isan-tsegondra na 20,000 XNUMX cycle). Eny tokoa, ny feon’ny mpanadio ultrasonika dia azo heno mandritra ny fiasa noho ny vokatry ny antsointsika hoe cavitation ultrasonic.

Ny teknika dia mamoy ny sasany amin’ireo tombony azo amin’ny fomba fanadiovana satria mety hiteraka fahasimban’ny singa na fifandraisana malalaka ary koa ny vovoka sy loto. Raha ny marina dia namoaka toromarika ny NASA mba tsy hampiasa fanadiovana ultrasonic satria mety hiteraka fisarahana tampoka ny end end caps ary hanimba ny tariby mifamatotra ao anatin’ny IC sy ny fitarihan’ny ultrasonika ny angovo fifamatoran-kofehy mifamatotra amin’ny alàlan’ny rafitra fitarihana IC.

Having said that, there are still places where ultrasonic cleaning can be used. Ny fizotran’ny fanadiovana ultrasonic dia mety hahatratra ny toerana sarotra indrindra sy sarotra aleha eo ambanin’ny fivorian’ny olona avo lenta amin’ny ankamaroan’ny faritra ao amin’ny solaitrabe. Tsy izany no zava-misy ho an’ny fitaovana SMD misy banga kely izay kely kokoa noho ny coefficient fihenjanana ambonin’ilay tsiranoka fanadiovana. Saingy, haingana ny fizotrany, ary misy milina avo lenta izay mahazaka fanadiovana be dia be.

Masinina fanadiovana ultrasonic PCB

Ny Cavitation dia tsy dingana malefaka. Nikajiana fa ny mari-pana mihoatra ny 10,000 ° F sy ny fanerena mihoatra ny 10,000 PSI dia hiteraka eo amin’ny toerana mirongatra ireo bolongam-bidy.

Ireo mpanadio ultrasonic dia afaka mamokatra refesina manomboka amin’ny 25 kHz ka hatramin’ny 100+ kHz, refesina amin’ny tsingerina isan-tsegondra. Ny refesina ambany dia mamokatra miboiboika be kokoa noho ny avo kokoa. Nipoaka mahery vaika kokoa ny vongan-kazo lehibe kokoa, ohatra, mba hanesorana ireo loto feno amin’ny faritra vy vita. Ny refesina avo kokoa dia mamokatra volo kely kokoa, mahatonga ny fanadiovana bubble ho malefaka kokoa nefa afaka miditra amin’ny vakivaky, triatra ary lavaka jamba. Ny refesina avo kokoa dia ampiasaina hanadiovana ireo faritra voadio tsara na marefo.

famaranana

Misy orinasa manokana amin’ny fanadiovana PCB. Miankina amin’ny zavatra ilainao (toy ny zana-kazo marobe, inona no mila diovina, ary malemy ny zana-kazo), dia azonao atao ny mitady ny loharano ivelany mety tsara mifanaraka amin’ny filanao fanadiovana.

Raha matetika ianao manana olana amin’ny tabilao mila fanadiovana dia mety misy zavatra manan-danja kokoa hijerena mandritra ny famolavolana na ny famokarana.

Ny fanadiovana PCBS dia tsy tokony ho asa goavana. Ny fitadidiana ireo torohevitra sy sosokevitra etsy ambony dia hanampy anao hiantoka fa vita tsara ny fanadiovana.