Hatisitsoeng oa potoloho botoHaholo-holo tse sebelisoang ho li-PDA (bathusi ba dijithale) tse kang liselefouno, li kotsing ea ho hlekefetsoa. 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. Ka lebaka leo, ho hlahile indasteri ea litšebeletso e fanang ka lits’ebeletso tsa ho hloekisa le ho lokisa li-PCBS tse silafetseng, empa ntle le tšenyo ea mmele ho li-PDA le lisebelisoa tse kholo.

Cleaning printed circuit boards (PCBS) to repair high-purpose products is as delicate a process as making circuit boards. Haeba mokhoa o fosahetseng oa ho hloekisa o sebelisoa, o ka senya likhokahano, oa lokolla likarolo le ho senya thepa. 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.

Maraba aa ke afe? How can they be avoided?

Ka tlase, re tla lekola likhetho tse netefalitsoeng tsa ho hloekisa PCB le tse ling tseo o kanna oa se batle ho li sebelisa.

Mefuta e fapaneng ea litšila

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

Litšila tse omileng (lerōle, litšila)

E ‘ngoe ea maemo a tloaelehileng haholo ke hore lerōle le bokellana ka hare ho PCB. Ka bonolo sebelisa borashe bo bonyenyane bo bobebe (joalo ka borashe ea pente ea pere) ho tlosa lerōle ntle le ho ama likarolo. There is a limit to where even the smallest brush can reach, such as under the component.

Moea o petelitsoeng o ka fihla libakeng tse ngata, empa o ka senya likhokahano tsa bohlokoa, ka hona, tlhokomelo e lokela ho nkuoa ha o sebelisoa.

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

Lintho tse silafatsang metsi

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. Ho seng joalo, sehlahisoa se tla fumana soda e thellang mme se senye liboto. Either way, these substances should be addressed before they accumulate and affect performance.

Boholo ba litšila bo ka tlosoa ka lihloeki, joalo ka joala ba isopropyl (IPA) le likeletso tsa q, liporase tse nyane kapa lesela le hloekileng la k’hothone. Sebelisa li-solvent tse kang IPA ho hloekisa PCB feela tikolohong e nang le moea o lekaneng, ka ho khetheha ka har’a mosi oa mollo.

U ka sebelisa metsi a ikhethileng ho fapana le hoo. 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. Lihloeki tse fapaneng li ka sebetsana le mefuta e itseng ea litšila, joalo ka ts’ebetsong kapa boka. 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. Haeba u khona, ha ho hlokahale hore u leke lihloeki linthong tsa khale kapa lihokelong ho netefatsa hore ha u senye tšenyo e ngata.

Galena PCB ho hloekisa

Ts’ebeliso ea mochini o hloekisang maqhubu a maqhubu a phahameng e baka cavitation. Tšusumetso e mabifi ea libululoana tse nyane ka har’a tharollo ea ho hloekisa e ka tankeng e hloekisang ea mahlaseli. The bubbles are generated by a transducer attached to the bottom of the tank and are excited by the generator at an ultrasonic frequency. Ho phatloha ha bubble tsena ho tla fefoloa ke litšila tse tsoang bokaholimo bo hloekileng ba likarolo.

Ultrasound e ka hlalosoa e le maqhubu a molumo ao maqhubu a ‘ona a leng kaholimo ho moeli o kaholimo oa sebaka se tloaelehileng sa kutlo ea motho, ke hore, hoo e ka bang 20 kHz (20 kHz ka motsotsoana kapa lipotoloho tse 20,000). Ka ‘nete, molumo oa hloekiso ea mahlaseli o ka utluoa nakong ea ts’ebetso ka lebaka la phello ea seo re se bitsang ultrasonic cavitation.

Mokhoa ona o lahleheloa ke melemo ea ona e le mokhoa oa ho hloekisa hobane o ka baka tšenyo ea likarolo kapa likhokahano tse hlephileng hammoho le lerōle le litšila. Ebile, NASA e fane ka taelo ea hore ho se sebelisoe ho hloekisa ha li-ultrasonic hobane ho ka etsa hore ka boomo ho bake likhechana tsa likarolo ho arohana le ho senya likhoele tse kopanyang kahare ho IC le ts’ebetso ea ultrasonic ea matla a kopanyang a terata ka foreimi ea lead ea IC.

Ha ke se ke boletse joalo, ho ntse ho na le libaka moo ho ka sebelisoang ho hloekisa mahlaseli. Ts’ebetso ea ho hloekisa mahlaseli e ka fihla libakeng tse thata ka ho fetisisa, tse thata ho fihlella ka tlasa kopano e nang le letsoalo le phahameng likarolong tse ngata tsa boto ea potoloho. Ha ho joalo ka lisebelisoa tsa SMD tse nang le likheo tse nyane tse nyane ho feta coefficient ea tsitsipano ea bokaholimo ea mokelikeli o hloekisang. Leha ho le joalo, ts’ebetso ena e potlakile, ‘me ho na le mechini e mengata e nang le bophahamo bo phahameng e ka sebetsang ka bongata ba ho hloekisa.

Mochini oa ho hloekisa o chesang oa PCB

Cavitation ha se mokhoa o bonolo. Ho baliloe hore lithemparetjha tse fetang 10,000 ° F le likhatello tse fetang 10,000 PSI li tla hlahisoa sebakeng se phatlohang sa bubble ea cavitation.

Lisebelisoa tsa Ultrasonic li ka hlahisa maqhubu ho tloha ho 25 kHz ho isa ho 100+ kHz, e lekantsoeng ka mekoloko ka motsotsoana. Maqhubu a tlase a hlahisa li-bubble tse kholo tsa cavitation ha li bapisoa le maqhubu a phahameng. Li-bubble tse kholo li phatlohile ka matla, mohlala ho tlosa litšila tse felletseng likarolong tsa tšepe tse entsoeng. Maqhubu a phahameng a hlahisa bubble e nyane, e etsa hore ho hloekisoa ha bubble ho be bonolo empa ho khonehe ho kenella mapetsong, likoti le masoba a foufetseng. Maqhubu a phahameng a sebelisoa ho hloekisa bokaholimo bo bentšitsoeng haholo kapa bo bokoa.

bofello

Ho na le lik’hamphani tse sebetsanang le ho hloekisa PCB. Ho ipapisitse le litlhoko tsa hau (joalo ka palo e kholo ea mapolanka, se hlokang ho hloekisoa, le hore na mapolanka a senyeha ha kae), o kanna oa batla mohloli o nepahetseng o kantle o ka khahlametsang litlhoko tsa hau tsa ho hloekisa.

Haeba khafetsa u ba le mathata ka liboto tse hlokang ho hloekisoa, mohlomong ho na le lintho tsa bohlokoa ho feta tseo u lokelang ho li hlahloba nakong ea moralo kapa ts’ebetso ea tlhahiso.

Ho hloekisa PCBS ha ea lokela ho ba mosebetsi o boima. Ho boloka likeletso le litlhahiso tse kaholimo ka kelellong ho tla thusa ho netefatsa hore tlhoekiso e etsoa ka nepo.