Malo otentha a rework air ndi chida chothandiza kwambiri popanga PCBs. Kawirikawiri gulu lidzakhala lokongola ndipo kawirikawiri chips ndi zigawo ziyenera kuchotsedwa ndikutsatidwa panthawi ya mavuto. Kuyesera kuchotsa IC popanda kuwonongeka sikungatheke popanda malo otentha. Malangizo ndi machenjerero a kutentha kwa mpweya wotentha kumathandiza kuti zigawo zikuluzikulu ndi IC zikhale zosavuta.
Zida Zoyenera
Kukonzekanso kwazitsulo kumafuna zida zingapo pamwamba ndi kupitirira kuyika kosakaniza. Kukonzekera koyamba kungatheke ndi zida zingapo, koma kuti zikhale zikuluzikulu, komanso kupambana kwabwino (popanda kuwononga bungwe) zida zina zochepa zimalimbikitsidwa kwambiri. Zida zofunika ndi izi :
- Mpweya wotentha wotentha (rework air-solder rework station)
- Wosakaniza
- Phulusa la solder (kuti mukhazikitse)
- Solder kutuluka
- Kutsekemera chitsulo (ndi kusintha kosinthika kutentha)
- Omwewola
Kuti ntchito yowonjezereka ikhale yosavuta, zida zotsatirazi ndizofunika kwambiri:
- Mitambo yowonjezera mpweya wotentha (makamaka kwa chips zomwe zidzachotsedwe)
- Chip-Quik
- Chipinda Choyaka
- Stereomicroscope
Kukonzekera kwa Resoldering
Kuti chigawo choyenera kugulitsidwa kumadontho ofanana omwe chigawochi chimachotsedwa, pamafunika kukonzekera kokha kuti asagwire ntchito nthawi yoyamba. Kawirikawiri pulogalamu ya solder imasiyidwa pamapangidwe a PCB omwe ngati atachoka pa pads amachititsa IC kukwera ndipo ikhoza kuteteza mapepala onse kuti asagulitsidwe bwino. Komanso ngati IC ili ndipansi pansi pamtunda kuposa solder yawo imatha kukweza IC kapena ngakhale kupanga zovuta kukonza matanthwe otsekemera ngati imachotsedwa pamene IC ikugwedezeka pamwamba. Mankhwalawa amatha kutsukidwa ndi kuwonongeka mofulumira mwa kudula chitsulo chosungunula chachitsulo chosakaniza pamwamba pawo ndikuchotsa chosakaniza.
Mphoto
Pali njira zingapo zoti muthamangire IC mwamsanga pogwiritsa ntchito malo otentha omwe amagwiritsidwa ntchito. Chofunika kwambiri, ndipo chimodzi mwa zosavuta kugwiritsa ntchito, njira zogwiritsira ntchito ndi kugwiritsa ntchito mpweya wotentha ku chigawocho pogwiritsa ntchito kayendetsedwe kozungulira kotero kuti solder pa zonsezi zimasungunuka pa nthawi yomweyo. Pamene solder imasungunuka, chigawocho chikhoza kuchotsedwa ndi mapepala awiriwa.
Njira ina, yomwe imathandiza makamaka ku ICs zazikuru ndi kugwiritsa ntchito Chip-Quik, yotentha kwambiri yotentha yotentha yomwe imasungunuka pamtunda wotsika kwambiri kusiyana ndi kuundana. Akasungunuka ndi solder wothira iwo amasanganikirana ndi solder amakhalabe madzi kwa masekondi angapo omwe amapereka nthawi yambiri yochotsa IC.
Njira ina yochotseratu IC imayamba ndi kutseka phokoso lililonse limene chigawocho chimachokera. Kuphwanya mapepala onse kumapangitsa kuti IC ichotsedwe ndipo mpweya wotentha kapena chitsulo chosungunula chimatha kuchotsa zotsalira za pini.
Zoopsa za Solder Rework
Pogwiritsa ntchito mpweya wotentha wotentha rework station kuti muchotse zigawozo sikuti mulibe chiopsezo chonse. Zinthu zomwe zimawoneka bwino ndi izi:
- Kuvulaza zigawo zapafupi - Palibe zigawo zonse zomwe zingathe kupirira kutentha kofunikira kuchotsa IC panthawi imene ingatenge kuti isungunuke ndi solder pa IC. Kugwiritsira ntchito zishango za kutentha monga zojambulazo zowonjezera zingathandize kuchepetsa kuwonongeka kwa pafupi ndi mbali.
- Kuwononga bolodi la PCB - Pamene mpweya wotentha wa mpweya ukugwiritsidwa ntchito kwa nthawi yaitali kuti utenthe pini yaikulu kapena kudula PCB ikhoza kutenthetsa kwambiri ndikuyamba kufotokoza. Njira yabwino yopewera izi ndi kutenthetsa zigawozo pang'onopang'ono kuti gulu lozungulira likhale ndi nthawi yambiri yosinthira kusintha kwa kutentha (kapena kutentha gawo lalikulu la bolodi ndi kuyenda kozungulira). Kuwotcha PCB mofulumira kwambiri kumangokhala ngati kutaya madzi oundana kumalo ozizira otentha - kupewa kuthamanga msanga nthawi iliyonse.