Papan sirkuit anu dicitak, utamina anu dianggo dina PDA (asisten digital pribadi) sapertos telepon sélulér, rentan disiksa. 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. Hasilna, industri jasa parantos muncul anu nyayogikeun jasa beberesih sareng ngalereskeun PCBS anu terkontaminasi, tapi tanpa karusakan fisik di PDA sareng alat ageung.

Cleaning printed circuit boards (PCBS) to repair high-purpose products is as delicate a process as making circuit boards. Upami metoda beberesih anu salah dianggo, éta tiasa ngarusak koneksi, ngaleupaskeun komponén sareng bahan karusakan. 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.

Naon sarap ieu? How can they be avoided?

Dihandap ieu, urang bakal ngajajah pilihan beberesih PCB anu kabuktosan sareng sababaraha anu sigana teu anjeun hoyong pake.

Béda jinis polutan

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

Rereged garing (lebu, kokotor)

Salah sahiji kaayaan anu paling umum nyaéta lebu akumulasi dina atanapi sakitar PCB. Gampang nganggo sikat anu lemes sareng lemes (sapertos sikat cet horsehair) kanggo miceun lebu tanpa mangaruhan komponén. There is a limit to where even the smallest brush can reach, such as under the component.

Hawa anu dikomprés tiasa ngahontal seueur daérah, tapi tiasa ngarusak koneksi anu penting, janten jaga kedah dijaga nalika ngagunakeun éta.

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

Rereged baseuh (kokotor, minyak lilin, fluks, 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. Upami teu kitu, produk bakal meunang soda caket sareng ngacak-ngacak papan. Either way, these substances should be addressed before they accumulate and affect performance.

Kaseueuran noda tiasa dipiceun ku tukang beberesih, sapertos isopropil alkohol (IPA) sareng q-tip, sikat alit atanapi kaén katun bersih. Anggo pangleyur sapertos IPA pikeun ngabersihan PCB hungkul dina lingkungan anu berventilasi anu hadé, langkung saé dina tiung haseup.

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. Bébas anu tiasa ngabersihkeun jinis rereged khusus, sapertos fluks atanapi lilin. 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. Upami anjeun tiasa, anjeun henteu kedah nyobian tukang ngabersihkeun komponén anu langkung lami atanapi panyambungna pikeun mastikeun anjeun henteu seueur teuing ngarusak.

Beberesih PCB PCS

The use of high frequency ultrasonic cleaning machine causes cavitation. Implosion ganas samilyar gelembung leutik dina leyuran beberesih anu dikandung dina tank cleaner ultrasonik. The bubbles are generated by a transducer attached to the bottom of the tank and are excited by the generator at an ultrasonic frequency. Bursting gelembung ieu bakal ditiup ku rereged tina permukaan bersih bagian-bagian na.

Ultrasound tiasa dihartikeun salaku gelombang sora anu frékuénsi na luhur wates luhur kisaran normal dédéngéan manusa, nyaéta sakitar 20 kHz (20 kHz per detik atanapi 20,000 siklus). Mémang, sora tina beberesih ultrasonik tiasa didangukeun nalika dioperasikeun kusabab pangaruh naon anu disebatna ultrasonical cavitation.

Téhnik éta kaleungitan sababaraha kaunggulan salaku padika ngabersihkeun sabab tiasa nyababkeun komponén karusakan atanapi sambungan leupas ogé lebu sareng kokotor. Nyatana, NASA parantos ngaluarkeun arahan supados henteu nganggo beberesih ultrasonik sabab teu dihaja nyababkeun tutup tungtung komponén pikeun misah sareng leres-leres ngarusak kabel beungkeutan di jero IC sareng konduksi ultrasonik énergi kawat beungkeutan ngalangkungan pigura kalungguhan IC.

Saatos nyarios yén, masih aya tempat-tempat dimana beberesih ultrasonik tiasa dianggo. Prosés beberesih ultrasonik tiasa ngahontal lokasi anu paling hese, hese dihontal dihandapeun majelis padet anu luhur dina sabagéan ageung papan sirkuit. Ieu sanés kanggo alat SMD kalayan sela alit anu langkung alit tibatan koefisien tegangan permukaan cairan beberesih. Nanging, prosésna gancang, sareng aya seueur mesin volume tinggi anu tiasa ngadamel beberesih ageung.

Mesin beberesih ultrasonik PCB

Kavitasi sanés prosés anu hipu. Diitung yén suhu anu langkung ti 10,000 ° F sareng tekanan anu langkung ti 10,000 PSI bakal dihasilkeun di tempat bursting gelembung kavitasi.

Pembersih ultrasonik tiasa ngahasilkeun frekuensi mimitian ti 25 kHz dugi ka 100+ kHz, diukur dina siklus per detik. Frékuénsi handap ngahasilkeun gelembung kavitasi anu langkung ageung dibandingkeun frékuénsi anu langkung luhur. Gelembung gedé ngabeledug beuki kuat, contona pikeun miceun total rereged tina bagian logam anu diolah. Frékuénsi luhur ngahasilkeun gelembung anu langkung alit, ngajantenkeun pembersih gelembung langkung lemes tapi langkung tiasa nembus retakan, celah sareng liang buta. Frékuénsi luhur dianggo pikeun ngabersihkeun permukaan anu paling digosok atanapi rapuh.

kacindekan

Aya perusahaan khusus kana beberesih PCB. Gumantung kana kabutuhan anjeun (sapertos sajumlah ageung papan, naon anu kedah dibersihkeun, sareng kumaha rapuhna papan), anjeun tiasa milarian sumber éksternal anu pas pikeun nyumponan kabutuhan beberesih anjeun.

Upami anjeun sering ngalaman masalah sareng papan anu kedah dibersihkeun, panginten aya hal anu langkung penting pikeun diperiksa nalika desain atanapi prosés manufaktur.

Meresihan PCBS henteu kedah janten tugas anu pikasieuneun. Ngainget tips sareng saran di luhur bakal ngabantosan yén diberesihkeun leres-leres dilakukeun.