PCB tsim yuav tsum muaj kev txheeb xyuas qhov tseeb thiab lub sijhawm zoo. Txawm li cas los xij, nws yog ib qho yooj yim los ua yuam kev thaum tsim theem, thiab yuam kev hauv PCB tsim muaj peev xwm ua rau poob peev. Txawm li ntawd los, coob tus tseem nyiam tsim lawv tus kheej PCBs. Yog li ntawd, peb tau sau ib daim ntawv teev cov kev ntsuam xyuas 57 kom mus raws lub sijhawm tsim qauv ua ntej xa koj tus PCB tuaj tsim, los pab koj kom tsis txhob raug nyiaj ntau.
Tsis muaj ntau yam ntxiv, cia pib.
General Design Checks
1. Tshawb xyuas kom meej tias cov haujlwm tivthaiv muaj tseeb thiab tsis tau tsiv tawm ntawm lawv cov haujlwm.
2. Xyuas kom tag nrho cov khoom siv ntim zoo ib yam li cov tsev khaws ntaub ntawv pov thawj ntawm cov ntawv pov thawj yog tias ua tau thiab cov tsev qiv ntawv cov khoom siv tau tuaj txog hnub.
3. Xyuas kom tseeb tias muaj pod thaj tsam txaus rau kev tivthaiv ua rau thiab tiv tauj.
4. Txiav txim xyuas seb puas muaj tej yam loj dua tuaj yeem ua rau muaj kev cuam tshuam rau lub rooj xa khoom. Cov khoom hnyav hnyav yuav tsum tau nyob ze ntawm PCB qhov chaw txhawb lossis ob tog kom txo PCB warpage lossis deformation
5. Yuav tsum tau saib xyuas kom tsis txhob tiv tauj nruab nrab ntawm cov khoom uas muaj xim tho xim. Tus kws muag khoom pom zoo yuav tsum tau ua kom tiav yog tias muaj.
6. Yog tias cov laug cam yuav tsum tau yoj tes yau, cov pob khoom yuav tsum raug xaiv los ua tus tsim kom yoj tes yoj qhov twg tau.
7. Rau cov khoom ntev, txoj kab nruab ntug yuav tsum raug xam tias yog qhov ua tau zoo. Qhov chaw txaus yuav tsum tau muab faib rau txoj kab nruab ntug.
Kab Ntsig Qhov Ncauj Lom Zem
8. Xyuas kom meej tias cov pawm uas muaj cov kev cai tshwj xeeb, xws li BGAs kom zoo qhib rau hauv lub looj ntsej muag looj ntsej muag raws li kev tsim cov khoom siv.
9. Txiav txim seb puas yog ntawm kev pluggin, tshwj xeeb tshaj yog rau cov khoom BGA.
10. Xyuas kom tseeb tias txoj kev cai qhib los yog tented tsim nyog.
11. Xyuas kom meej tias cov qhab nia tsis yog nyob hauv kev sib cuag nrog cov npauj npuaj lossis cov kab tso tawm.
12. Txiav txim seb puas yog ICs, siv lead ua oscillators, thiab lwm yam khoom siv uas tau tawm mus rau cov cua kub kis los yog hauv av shielding, khi daim npog qhov ncauj thiab cov pawm ntawm PCB lub rooj tsavxwm. Cov chiaj ntsej muag yuav tsum muaj qhov tsim kom muaj lub ntsej muag looj kom dav kom tiv thaiv tau cov kab laug sab laug.
Txav thiab Tso Tawm
13. Ua kom muaj kev sib txuas nrog cov xim tho hlau thiab cov cua sov dissipation systems, yuav tsum tsis txhob muaj tej yam khoom siv los yog kev khavthawj uas yuav ua rau muaj teeb meem luv luv.
14. Yuav tsum tsis txhob muaj cov khoom siv los yog vias nyob rau ntawm qhov chaw ntawm screws thiab ntxuav.
15. Rau cov uas tsis yog nyob ntawm qhov, tshem tawm ntawm qhov ntau ntawm 0.5 hli (20mils) ntawm sab hauv ntawm lub qhov thiab tooj liab ib puag ncig.
16. Qhov kev ncua deb ntawm cov cim thiab ntug ntawm lub rooj tsavxwm yuav tsum yog yam tsawg 3 hli.
17. Qhov kev ncua deb ntawm cov kab hauv puab txheej mus rau ntawm ntug ntawm lub rooj tsavxwm yuav tsum yog yam tsawg 4 hli.
Txau Layout
18. Xyuas kom meej tias SMD cov khoom nrog ob qho sib txawv (tshwj xeeb tshaj yog rau 0805 qhov ntau thiab tsawg dua), cov kev uas txuas nrog rau cov pawm uas tau sib tw los ntawm qhov chaw ntawm lub ncoo thiab muaj qhov dav dav.
19. Rau 0805 qhov SMD Cheeb Tsam thiab hauv qab no, xyuas seb qhov cim kab txuas mus rau hauv lub ncoo yog ntau dua li ntawm lub ncoo nws tus kheej. Yog tias muaj, ces qhov cim tseg yuav tsum tau ua rau qhov narrower qhov nws ncav lub ncoo.
20. Tshawb xyuas tias cov kev sib txuas ntawm cov kev sib txuas ntawm SOIC, PLCC, QFP, SOT, thiab lwm yam yog yam ua tau tawm kom deb li deb tau.
Vias
21. Yog tias txoj kev siv cov txheej txheem siv cov txheej txheem siv, nws yuav tsum tsis txhob muab tso rau ntawm qhov sib txawv (qhov kev ncua deb ntawm cov vias thiab cov pawm yuav tsum siab tshaj 0.5 hli (20mil).
22. Tshawb xyuas tias lub vias tsis tsim kom ze ze ua ke kom tsis txhob kos duab ntau dhau tam sim no, uas yuav ua rau pawg thawj coj yuav tawg.
23. Xyuas kom tseeb tias lub cheeb ntawm vias yog tsis pub tsawg tshaj li ntawm 1/10 ntawm lub rooj sib thooj.
Tooj liab
24. Rau tej qhov chaw loj ntawm tooj liab ncuav rau sab saum toj thiab sab hauv qab, ib daim phiaj sib txawv tuaj yeem siv tau yog tias tsis muaj qhov xav tau tshwj xeeb.
25. Xyuas kom pom tias cov cheeb tsam tooj liab (thaj chaw ntawm tooj liab tuag) tau raug tshem tawm, tshwj xeeb tshaj yog rau cov qauv tsim tawm high-frequency.
26. Ua tib zoo saib xyuas txhua yam ntawm kev ua txhaum cai txawm ua ntej DRC khiav haujlwm.
Silkscreen
27. Txheeb xyuas seb cov khoom ntim rau feem ntawm txhua feem ntawm pawg thawj coj saib puas muaj tseeb thiab seb puas muaj cov ntawv qhia ntawm daim ntawv qhia tso cai yooj yim rau cov ntawv pov thawj.
28. Xyuas kom meej tias qhov sib txawv ntawm cov koob thiab cov naj npawb tus naj npawb xov tooj, polarity thiab orientation tuaj yeem yooj yim txheeb tau.
29. Tshawb xyuas cov connectors thiab cov thooj txhij hais tias yog tias tsim nyog.
30. Xyuas kom meej tias qhov loj thiab qhov loj ntawm cov ntawv nyeem hauv silkscreen yuav ua raws li cov chaw tsim khoom lub peev xwm thiab tias lawv tuaj yeem nyeem nrog lub qhov muag liab qab.
31. Xyuas kom meej tias cov ntawv cim xws li anti-static, xov tooj cua zaus, nyob hauv lub silkscreen yog tias tsim nyog.
32. Xyuas kom tseeb tias cov ntawv nyeem silkscreen tsis tau muab tso rau sab saum toj ntawm cov cheeb tsam tooj liab los yog kaw vias uas ua rau tuaj yeem nyeem tsis tau.
33. Xyuas kom tag nrho cov ntawv sau rau hauv cov laug cam yog nyob rau hauv daim phiaj xwm tswv yim thiab tsis cuam tshuam los ntawm v-cuters, slots, drill hits, etc. uas tuaj yeem cuam tshuam kev nyeem ntawv.
Cov Cim Ua Ntej
34. Xyuas kom meej tias cov cim tseem ceeb yog qhov chaw rau cov kab uas xav tau kev pabcuam ntxiv.
35. Xyuas kom meej tias txhua lub cim tseem ceeb tsis sib tshooj nrog cov hlua kab silkscreen los yog cov cim.
36. Xyuas kom pom tias cov keeb kwm ntawm cov kab ntawv tseem ceeb yog tib yam, thiab xyuas tias qhov kev ncua deb ntawm qhov chaw nruab nrab, tshwj xeeb tshaj yog cov phiajcim xa mus rau ntawm ntug kev yog qhov tsawg kawg yog 6 hli.
37. Rau cov ICs uas muaj tus pin center nrug <0.5mm thiab="" bga="" li="" nrog="" qhov="" chaw="" nyob="" nruab="" nrab="" tsawg="" dua="" 0.8="" hli="" (31="" mils),="" xav="" txog="" lub="" zos="" cov="" cim="" ntiag="" tug="" thiab="" xyuas="" kom="" lawv="" muab="" tso="" ze="" ntawm="" lub="" kaum="" sab="" xis="" ntawm="" kev="">
Cov ntsiab lus xeem
38. Txiav txim siab seb qhov kev xeem ntawm qhov kev xeem tam sim no muaj txaus.
39. Xyuas kom meej tias cov circuits uas tsis muaj cov ntsiab lus ntawm kev ntsuam xyuas ntxiv tau raug kho dua.
Tsim Tus Txiav Txim (DRC)
40. Yog tias muaj, sib kho thiab khiav ncaj qha Cov Cai Tsim Raws Cai Raws li tus tsim cov khoom siv uas tau xaiv, thiab kev qhia txog kev ua txhaum.
41. Xyuas kom tseeb tias DRC cov kev cai yog mus paub thiab ua raws nraim nrog lub tuam txhab uas tau xaiv.
Raug cov Ntaub Ntawv
42. Xyuas kom meej tias cov ntaub ntawv xws li PCB thickness, cov khaubncaws sab nraud povtseg, cov kabmob kasmoos xim, tooj liab, thiab lwm cov ntaub ntawv uas muaj tseeb yog raug xa mus rau lub khw.
43. Tshawb xyuas cov npe ntawm cov khaubncaws sab nraud povtseg yog ua raws li qhov chaw ua haujlwm nyiam.
44. Xyuas kom tseeb tias pawg tswj hwm pawg pov tseg, tuab, thiab tooj tuab kuj muaj tseeb thiab xyuas seb puas yuav tsum muaj kev tswj hwm tus kheej
45. Ua kom pom cov ntaub ntawv (s) tiav nyob rau hauv Hom Piav.
46. Xyuas kom tseeb tias cov ntaub ntawv xyaum ua kom tiav nrog qhov tseeb version ntawm tus tsim.
47. Xyuas kom meej tias tus naj npawb thiab qhov hnyav ntawm qhov kev xyaum hits yuav phim cov ntaub ntawv tho thiab cov nplai ntais ntawv cov ntaub ntawv Gerber.
48. Yog tias ntau cov ntaub ntawv tho kom tau tsim rau qhov tsim, xyuas kom txhua tus muab rau lub khw.
49. Xyuas kom tseeb tias vias voos fais fab yuav tsum qhia meej meej thiab cim sau npe.
50. Xyuas kom meej tias cov qauv txheej txheem, nrog rau cov vaws thiab cov qhab nia, yog raug xa tawm hauv cov ntaub ntawv thiab nws tau txhais tau yooj yim txhais los ntawm kev siv
51. Tshawb xyuas cov ntaub ntawv uas tau txais los ntawm lub khw thiab xyuas kom tseeb tias cov ntaub ntawv xa tawm tom qab lawv cov txheej txheem yog tsis ntseeg, siv RS-274x hom rau cov ntaub ntawv Gerber thiab Hom Piv rau kev xyaum cov ntaub ntawv.
52. Rau hom ntawv RS-274D, xyuas kom meej tias cov ntaub ntawv coj los sib dhos tau muab tso nrog thiab paub txog nrog qhov tseeb version ntawm tus tsim.
53. Ntsuam xyuas seb cov ntaub ntawv Gerber puas muaj qhov txawv txav tsis zoo los yog nta thiab xyuas tias lawv txuam nrog cov khw.
54. Siv cov kev pab cuam Gerber saib xyuas seb cov ntaub ntawv Gerber zoo li qhov PCB tsim.
55. Xyuas kom meej tias tag nrho cov ntaub ntawv tsim tawm PCB yuav tsum muaj nyob rau hauv cov ntaub ntawv zip nrog rau tag nrho Circuit Court layers, daim npog qhov ncauj, silkscreen, qauv thiab cov ntaub ntawv tho, thiab lwm yam ntaub ntawv.
56. Yog tias lub rooj sibtham raug samfwm, xyuas kom cov chaw khaws ntaub ntawv thiab chaw sib koom nrog rau SMD cov khoom.
57. Yog tias xav tau ntawv, xyuas kom meej tias cov ntaub ntawv txaus qhia tau thiab cov lus taw qhia meej meej. Npaj cov duab thiab kos duab yog tias ua tau.
Cov no yog cov kev tshawb xyuas qee yam uas koj tuaj yeem siv los ntawm lub sijhawm PCB tsim. Daim ntawv no tsis yog tag nrho, tiam sis peb cia siab tias nws yuav pab cov neeg tuaj tshiab, hobbyist thiab cov neeg tsim kev paub txog kev tsim cov PCB zoo.
Tshooj thiab daim duab ntawm hauv internet, yog tias muaj kev cuam tshuam dab tsi hu peb mus rho tawm.
NeoDen muab tag nrho cov smt kev sib txuas daws teeb meem, xws li SMT reflow qhov cub, yoj tes laug tshuab, de laim qhov chaw luam ntawv, PCB loader, PCB unloader, nti mounter, SMT AOI tshuab, SMT SPI tshuab, SMT X-hluav taws xob tshuab, SMT los ua ke kab khoom siv, PCB Cov Khoom Pab Khoom Siv Nruab Nruag SMT tej yam zoo li txhua yam SMT cov cav koj xav tau, thov hu rau peb kom paub ntxiv:
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