PCB pawg thawj coj saib teeb meem luv luv

Qhov laj thawj loj tshaj plaws ntawm PCB luv Circuit Court yog tsim cov ntaub qhwv tsis zoo. Nyob rau lub sijhawm no, lub voj voos tuaj yeem hloov pauv mus rau ib qho duab elliptical kom nce qhov kev ncua deb ntawm cov ntsiab lus, txhawm rau tiv thaiv luv luv.

Kev tsim tsis tsim nyog ntawm PCB board Cheebtsam yuav ua rau luv luv Circuit Court board, uas ua rau inoperability. Yog hais tias tus pin ntawm SOIC yog sib npaug rau tin nthwv dej, nws yog ib qho yooj yim los ua ib qho kev sib tsoo luv luv. Nyob rau hauv rooj plaub no, cov kev taw qhia ntawm ib feem yuav raug hloov mus rau perpendicular mus rau tin yoj.

Lwm qhov laj thawj yog vim li cas lub rooj tsav xwm PCB yog luv luv, uas yog, qhov tsis siv neeg plug-in yog khoov. Raws li IPC tau teev tseg tias qhov ntev ntawm cov xaim yog tsawg dua 2 hli, thaum lub kaum sab xis yog qhov loj, qhov loj dhau thiab nws yooj yim ua rau luv luv. Qhov sib koom ua ke yog ntau tshaj 2 hli ntawm lub voj voog.

Ntxiv rau peb qhov laj thawj saum toj no, muaj qee qhov laj thawj uas tuaj yeem ua rau luv luv Circuit Court tsis ua haujlwm ntawm PCB board. Piv txwv li, lub substrate qhov loj heev, qhov kub ntawm lub cub tawg yog tsawg heev, lub solderability ntawm lub board nto yog tsis zoo, lub qhov ncauj qhov ntswg yog tsis siv, thiab lub rooj tsavxwm. Qhov chaw paug thiab lwm yam yog qhov ua rau tsis ua haujlwm. Tus engineer tuaj yeem tshem tawm thiab tshawb xyuas cov laj thawj saum toj no thiab ua yuam kev ib los ntawm ib qho.

4 txoj hauv kev los txhim kho PCB qhov chaw ruaj khov luv luv

Kev txhim kho luv luv luv-circuit luv luv-circuit txhim kho PCB feem ntau yog tshwm sim los ntawm khawb ntawm cov yeeb yaj kiab ntau lawm kab lossis cov khib nyiab txhaws ntawm lub vijtsam coated. Lub coated anti-plating txheej yog raug rau tooj liab thiab ua rau luv luv Circuit Court hauv PCB. Cov kev txhim kho yog raws li nram no:

Cov yeeb yaj kiab ntawm zaj duab xis yuav tsum tsis txhob muaj teeb meem xws li trachoma, khawb, thiab lwm yam. Thaum muab tso rau, lub ntsej muag ntawm cov yeeb yaj kiab yuav tsum tsis txhob rub tawm tsam lwm yam khoom. Thaum luam tawm cov yeeb yaj kiab, cov yeeb yaj kiab raug ntsia saum npoo ntawm zaj duab xis, thiab cov yeeb yaj kiab tsim nyog tau thauj khoom raws sijhawm. Khaws rau hauv ib lub hnab zaj duab xis.

Thaum cov yeeb yaj kiab raug ntsia, nws ntsib PCB nto. Thaum tua zaj duab xis, khaws cov kab pheeb ces kaum ntawm ob txhais tes. Tsis txhob kov lwm yam khoom kom tsis txhob khawb qhov saum npoo ntawm zaj duab xis. Thaum lub phaj ncav cuag ib tus lej, txhua zaj duab xis yuav tsum tsis txhob sib dhos. Kos lossis hloov manually. Muab tso rau hauv ib lub hnab ntim zaj duab xis thiab khaws cia.

Cov neeg ua haujlwm yuav tsum tsis txhob hnav cov khoom dai, xws li cov nplhaib, cov hlua, thiab lwm yam. Cov ntsia hlau yuav tsum tau txiav thiab khaws cia rau hauv lub vaj. Tsis muaj cov khib nyiab yuav tsum tau muab tso rau saum lub rooj, thiab lub rooj saum toj yuav tsum huv thiab du.

Ua ntej ua qhov screen version, nws yuav tsum tau soj ntsuam nruj me ntsis kom ntseeg tau tias tsis muaj teeb meem. Screen version. Thaum siv cov yeeb yaj kiab ntub dej, feem ntau yuav tsum tau kuaj xyuas daim ntawv los xyuas seb puas muaj daim ntawv thaiv ntawm qhov screen. Yog tias tsis muaj lub sijhawm luam ntawv, koj yuav tsum luam ib qho screen khoob ob peb zaug ua ntej luam ntawv kom cov thinner hauv tus cwj mem tuaj yeem ua kom tiav cov kua nplaum uas muaj zog kom ntseeg tau tias cov dej ntws tawm ntawm lub vijtsam.

PCB board luv Circuit Court soj ntsuam txoj kev

Yog tias nws yog phau ntawv welding, nws yog ib qho tsim nyog los txhim kho tus cwj pwm zoo. Ua ntej tshaj plaws, saib xyuas PCB pawg thawj coj saib ua ntej soldering, thiab siv multimeter los xyuas seb cov circuits tseem ceeb (tshwj xeeb tshaj yog cov khoom siv hluav taws xob thiab hauv av) luv luv. Qhov thib ob, solder lub chip txhua lub sijhawm. Siv ib lub multimeter los ntsuas seb lub hwj chim mov thiab av yog luv luv. Tsis tas li ntawd, tsis txhob solder hlau thaum soldering. Yog hais tias solder yog soldered mus rau solder taw ntawm lub nti (tshwj xeeb tshaj yog nto mount Cheebtsam), nws tsis yog yooj yim mus nrhiav.

Qhib PCB ntawm lub khoos phis tawj, teeb lub voj voog luv luv, thiab tom qab ntawd saib seb nws nyob ze rau nws thiab qhov yooj yim tshaj plaws los txuas. Thov xyuam xim tshwj xeeb rau qhov luv luv Circuit Court ntawm IC.

Ib qho luv luv tau pom. Siv lub rooj tsavxwm los txiav txoj kab (tshwj xeeb tshaj yog ib leeg / ob lub rooj tsavxwm). Tom qab slicing, txhua feem ntawm cov haujlwm thaiv yog energized nyias, thiab qee qhov tsis suav nrog.

Siv lub ntsuas hluav taws xob luv luv, xws li: Singapore PROTEQ CB2000 short-circuit tracker, Hong Kong Ganoderma QT50 short-circuit tracker, British POLAR ToneOhm950 multi-layer board short-circuit detector.

Yog tias muaj BGA nti, vim tias tag nrho cov pob qij txha tsis tau npog los ntawm cov nti, thiab nws yog cov txheej txheem ntau txheej (ntau tshaj 4 txheej), nws yog qhov zoo tshaj plaws los siv cov hlaws sib nqus los yog 0 ohm los cais lub zog ntawm txhua qhov. chip hauv kev tsim. Lub resistor txuas nrog yog li ntawd thaum lub zog hluav taws xob luv luv rau hauv av, cov hlaws sib nqus tau kuaj pom thiab nws yooj yim los nrhiav ib qho nti. Vim tias BGA nyuaj rau solder, yog tias nws tsis siv lub tshuab soldering, lub zog uas nyob ib sab thiab hauv av solder npas yuav ua tib zoo luv luv.

Ceev faj thaum soldering teev-loj thiab me nto mount capacitors, tshwj xeeb tshaj yog lub hwj chim lim capacitors (103 los yog 104), lawv tuaj yeem yooj yim ua rau luv luv ntawm lub hwj chim mov thiab hauv av. Ntawm chav kawm, qee zaum nrog hmoov tsis zoo, lub capacitor nws tus kheej yuav luv luv, yog li txoj hauv kev zoo tshaj plaws yog xyuas lub capacitor ua ntej soldering.