Mhepo inotonhorera rework inzvimbo inoshandiswa zvinoshamisa zvikuru pakuvaka PCBs. Kazhinji bhodhi rakagadzirirwa rive rakakwana uye kazhinji chips uye zvikamu zvinoda kubviswa uye kushandiswa munguva yekutambudzika. Kuedza kubvisa IC kunze kwekukuvadza kunenge kusingaitiki pasina chiteshi chinotyisa chemhepo. Aya mazano uye matanho emhepo inopisa rework ichaita kuti zvinhu zvivepo uye ICs nyore nyore.
The Right Tools
Solder rework inoda zvishandiso zvishomanana kumusoro uye kupfuura kwekugadzirisa kwekugadzirisa sariding. Kudzokorora kwekutanga kunogona kuitwa necheki zvishandiso zvishoma, asi kuti zvive zvakakura, uye zvakanyanya kubudirira (pasina kubvisa bhodhi) zvigadzirwa zvishoma zvinowanikwa zvakakurudzirwa. Zvinyorwa zvekushandisa ndezvi :
- Hot air solder rework station (kutarisa kushandura uye kutenderera kwemhepo kunokosha)
- Solder wick
- Solder paste (yekugadzirisa)
- Solder flux
- Kugadzirisa simbi (ine kugadziriswa kwekushisa kwekushisa)
- Tweezers
Kuita kuti solder rework ive nyore nyore, zvishandiso zvinotevera zvinobatsirawo:
- Mhepo inopisa rework busiki zvigadzirisiti (zvakananga kumapu achabviswa)
- Chip-Quik
- Hot Plate
- Stereomicroscope
Prepping for Resoldering
Kuti chikamu chinotengeswa kune imwe pads apo chimwe chikamu changobudiswa chinoda kugadzirira zvishomanana kugadzirisa kushanda kokutanga. Kazhinji chiyero chakakura cheseriji chinosara pamapadhethi eCPB ayo kana akasiyiwa pamapadhi anochengetedza IC kukwidza uye inogona kudzivirira mapepa ose kubva pakuderedzwa zvakanaka. Uyewo kana IC ine pasi yakadzika pakati nepakati pekudzikisa kwayo inogonawo kukonzera IC kana kutoita zvakaoma kugadzirisa mabhiriji ekugadzirisa kana ikasimudzwa apo IC inomanikidzwa pasi. Iyo pidhi inogona kucheneswa uye yakasimbiswa nokukurumidza nokupedza solder isina soldering iron pamusoro pavo uye kubvisa kusvibiswa kwakawandisa.
Rework
Pane nzira mbiri dzekukurumidza kubvisa IC kuishandisa hofisi yekutsvaga rehost air. Icho chinonyanya kukosha, uye chimwe chezvinhu zvakaoma ndezvekushandisa, maitiro ndekushandisa mweya unopisa kune chikamu uchishandisa kumira kwechiyero kuitira kuti kusungira pazvinhu zvose zvinenge zvichinyunguduka panguva imwe chete. Kana imwe sodder isungunuka chikamu chacho chinogona kubviswa pamwe neshure.
Imwe nzira, iyo inonyanya kukosha yeCI huru ndeyokushandisa Chip-Quik, iyo yakadzika kwazvo yekupisa solder inonyunguduka pamhepo yakadzika yakadzika kudarika solder yakazara. Kana ichinyungudutswa nehuwandu hwakasanganiswa iyo inosanganiswa uye iyo inosara inoramba yakasara kwemvura kwemaawa mashomanana anopa nguva yakawanda yokubvisa IC.
Imwe nzira yekubvisa IC inotanga nekugunzva chero mapepa iyo chikamu chine mairi. Kudonha dzose dzepini kunobvumira IC kuti ibviswe uye kana mhepo inopisa kana sariding iron inokwanisa kubvisa zvasara zvepini.
Ngozi dzeSolder Rework
Kushandisa inopisa air solder rework station kuti ibvise zvinhu hazvisi zvachose pasina ngozi. Zvinhu zvakajairika zvinokanganisa ndezvi:
- Kukuvadza zvinhu zviri pedyo - Hapana zvikamu zvose zvinogona kumira kupisa kunenge kwaidiwa kubvisa IC pane nguva iyo inogona kutora kuti ichinyungudze soda paII. Kushandisa zvishongo zvinopisa sezvinoitwa aluminium pepper zvinogona kubatsira kudzivirira kuparadzwa kwepedyo nezvikamu.
- Kukuvadza bhodhi rePBB - Kana bhuni remhepo inopisa inogadziriswa kwenguva refu kuti kupisa pini yakakura kana kudonha PCB inogona kupisa zvakanyanya uye inotanga kubvisa. Nzira yakanakisisa yekudzivisa izvi ndechokuti kupisa zvikamu zvishoma zvishoma kuitira kuti bhodhi rakapoteredza rive nenguva yakawanda yekugadzirisa kushandura kwekushisa (kana kupisa nzvimbo huru yebhodhi nekutenderera kweropa). Kuchenesa PCB nokukurumidza kwakafanana nekudonha ice cube mugizi remvura inodziya - usakurumidza kupisa kunetseka kana zvichibvira.