BGA Rework txheej txheem - Xov xwm

I. Veneer ci npaj thiab lwm yam yuav tsum tau ua

1. Raws li lub sijhawm sib txawv, cov veneer yuav muab cov kev cai sib txawv.

2. Lub sijhawm ci

SMT kho veneer tsis pub dhau 24 teev, tsis tuaj yeem mus dhau ntawm kev ci, BGA kho tau txais veneer hauv 10 teev tom qab ua tiav kev kho.

3. ua ntej lub baking board, lub receiver yuav xav tau kev saib xyuas kom xa lub rooj tsavxwm los yog project cov neeg kom tshem tawm cov kub-sensitive Cheebtsam tom qab ci, xws li fiber optics, roj teeb, yas tuav thiab lwm yam. Txwv tsis pub, cov cuab yeej tshwm sim los ntawm kev puas tsuaj los ntawm cov cua sov los ntawm tus neeg xa khoom los ntawm lawv tus kheej.

4. Tag nrho cov veneer, ci tiav tshem tawm cov veneer hauv 10 teev tom qab ua tiav ntawm BGA rework ua haujlwm.

5. 10 teev tsis tuaj yeem ua tiav hauv BGA rework kev ua haujlwm ntawm PCB thiab cov ntaub ntawv, yuav tsum muab tso rau hauv lub thawv qhuav kom txuag tau.

II. Ib lub rooj tsavxwm rov ua dua ua ntej kev tshuaj xyuas, kev npaj ceev faj

1. saib seb lub veneer ntawm lub buckle thiab rework nti (veneer rework nto thiab sab nraub qaum), nyob rau hauv 10mm nyob ib ncig ntawm qhov siab ntawm ntau tshaj 20mm (tsuas yog qhov cuam tshuam nrog cov cua kub nozzle) ntawm lub cuab yeej, yuav tsum tau buckle thiab cuam tshuam nrog lub rework ntawm lub cuab yeej tuaj yeem dismantled tsuas yog tom qab rework;

2. Yog hais tias lub rework veneer muaj fiber ntau optic, accessory cheeb tsam ntawm lub roj teeb yuav tsum tau muab tshem tawm ua ntej rework;

3. Yog hais tias lub rework veneer rov qab los ntawm rework nti 10mm thiab 10mm deb ntawm lub tshav kub dab dej, ntxig siv lead ua, electrolytic capacitors, yas lub teeb qhia kem, tsis-high-temperature bar code, BGA, BGA socket thiab los ntawm-lub qhov yas li. raws li cov khoom sib txuas yas, qhov saum npoo yuav tsum tau muab tso rau 5-6 txheej ntawm cov nplaum nplaum nplaum nplaum nplaum ua ntej ua haujlwm. Yog tias tsis pub dhau 10 hli ntawm cov khoom siv sib txuas yuav tsum tau muab tshem tawm (tshwj tsis yog BGA) ua ntej kho;

4. Lwm yam yuav raug cuam tshuam los ntawm tshav kub nyob rau hauv lub rework dhau mus rau hauv BGA thiab lwm yam chips, cov khoom siv yas, yuav tsum tau nqa tawm cov thermal rwb thaiv tsev.

III. Rework auxiliary cov ntaub ntawv los txiav txim

1. Cov khoom siv rov ua dua tshiab yog CCGA, CBGA, BGA thiab cov khoom siv pob khoom siv tsis yog 63/37 cov khoom siv, koj yuav tsum siv cov ntawv luam tawm rau kev ua haujlwm dua.

2. Thaum nws yog 63/37 solder khoom, muaj flux paste los yog luam ntawv solder paste txoj kev rau solder; Thaum siv cov welding welding, yuav tsum tau siv cov khoom siv sib txuas nrog cov luam ntawv ntawm cov tin me me stencils rau luam ntawv tin.

3. Cov khoom siv lead-dawb rework, tsawg dua 15 * 15mm BGA, koj tuaj yeem siv flux paste coated soldering, lwm qhov loj loj BGA yuav tsum tau siv los txhuam cov welding welding.

IV. Rework cov cuab yeej thiab lwm yam yuav tsum tau ua

1. Ua ntej rov ua haujlwm dua, yog tias cov cuab yeej tsis raug cua sov rau ntau tshaj 30min, cov cuab yeej yuav tsum tau preheated.

2. Veneer positioning thiab kev txhawb nqa

Kev them nyiaj yug pas nrig txoj haujlwm: kev txhawb nqa pas nrig raws li qhov sib luag (kom deb li deb tau ua kom lub veneer cua sov uniformity raws li lub hauv paus ntsiab lus), tsis tuaj yeem kov hauv qab ntawm lub cuab yeej. Kev them nyiaj yug pas nrig txoj hauj lwm zoo dua nyob rau hauv nruab nrab ntawm PCB pawg thawj coj saib, yog li ntawd lub PCB kom tswj tau qhov chaw tiaj tus, tsis tuaj yeem txhawb nqa rau lub cuab yeej, thiab yuav txuas rau lub buckle thiab positioning pin xauv. Rau cov PCBs me, qhov thaiv kev txhawb nqa tuaj yeem tig 90 degrees los kho.

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