Kua tae ki te waa ki te aro ki nga korero kei te kitea o Poari PCB, kia pai ake ai te whakarite kia kounga te hua. Ka kitea te poari PCB, me aro ki nga tikanga e 9 e whai ake nei.

1. He tino aukati ki te whakamahi i nga taputapu taatai ​​papaa hei whakapiri atu ki te pouaka whakaata ora, oro, riipene ataata me etahi atu taputapu i runga i te pereti o raro kia kitea te papa PCB me te kore o te panoni wehe.

Kaua e whakamatautau tika i nga pouaka whakaata, oro, me riipene whakaata hoki me te kore he motumotu wehe hiko me nga taputapu papa. Ahakoa te tikanga he mana te kaiwhakakamahara, ka kitea ana ki tetahi mana whakaputa rawa atu, nui atu ranei o te ahua o te mana hiko, kaore i te mohio mo te pouaka whakaata, taputapu taputapu ranei, tuatahi kia marama kua utua te miihini miihini, mena ka tino maamaa, ka ora tonu te papa. Te pouaka whakaata, oro me etahi atu taputapu hiko hiko hikoi hiko, kua horapa ki te ara iahiko tuitui, etahi atu waahanga pakaru.

2. Kia tupato ki te mahinga aukati o te hiko whakarewa hiko i te kitenga o te papa PCB

Kaore e ahei te whakamahi i te rino rewa me te mana ora. Kia kore ai e ora te rino rewa, he pai ake te tuku i te anga o te rino rewa. Me tupato ake te ara iahiko MOS, a he pai ake te haumaru ki te whakamahi i te hiko hiko hiko iti-hiko me te 6-8V.

3. I mua i te kitenga o te poari PCB, me maarama taatau ki te kaupapa mahi o te ara iahiko whakauru me te ara iahiko e pa ana

I mua i te tirotiro me te whakatika i nga ara iahiko, me maarama maatau ki nga mahi o te ara iahiko, iahiko o roto, i nga hiko hiko matua, te mahi a ia titi me te ngaohiko noa, te ngaru o te titi me te kaupapa mahi o te ara iahiko i te taha whanui. wae. Mena kei reira enei ahuatanga, he maama ake te taatai ​​me te tirotiro.

4, te poari PCB whakamatautau kaore i te ara poto i waenga i nga titi

Te inenga ngaohiko, te oscilloscope ranei me te whakamatautau i te ngaru, kaore te pene me te tirotirohia e rere i waenga i nga titi o te ara iahiko whakauru na te retireti, he pai ake te hono tika ki nga titi o te ara taarua peripheral mo te mehua. Tetahi ara iahiko poto ka ngawari te whakangaro i te ara iahiko INTEGRATED, no reira me tupato taatau ina whakamatautau koe i nga waahanga CMOS whakauru katoa.

5, detection PCB board test instrument internal resistance should be large

Ka whanganga i te ngaohiko DC o nga titi o porowhita tuitui, whakamahia he multimeter e kaha ake ana te aukati o-roto i te 20K ω / V; ki te kore, ka nui nga he o te inenga mo etahi ngaohara titi.

6. Kia tupato ki te wera o te hiko o te hiko hiko i te kitenga o te poari PCB

Power integrated circuits should have good heat dissipation and should not be allowed to work in a high power state without heat sink.

7, Ko te rapunga mata poari PCB kia tika

Mena he mea nui ki te taapiri i nga waahanga taapiri hei whakakapi i te waahanga kua pakaru i roto i te ara honohono, me kowhiri i nga waahanga iti, me nga waea waea kia tika ki te karo i te honohono parasitiki kaore e hiahiatia, ina koa ki te whakatutuki i te pito o te papa i waenga i te oro oro whakakotahi iahiko me te ara iahiko preamplifier.

8. Me whakarite te kounga maitai o te poari PCB

Ka tino pai ana te miihini, he maamaa te kohinga putunga me nga pore kia ngoikore ai te mariko. Ko te waa haehae he tikanga kaore i neke atu i te 3 hēkona, a ko te kaha o te rino whakarewa mo te 25W. Ko te ara iahiko whakauru kua paiherea kia ata tirohia, he pai ake te whakamahi i te ohmmeter ki te meera he ara poto i waenga i nga titi, whakaūhia kia kore he hononga whakapiri whakapiri ka huri i te hiko.

9, ko te kitenga o te poari PCB kaore e ngawari te whakatau i te kino o te ara iahiko

Do not easily judge that the integrated circuit is damaged. Na te mea ko te nuinga o nga ara honohono kua honohono tika, ka rereke te ara iahiko, akene he rerekee ngaohiko maha, ana ko enei rereketanga kaore pea na te kino o te ara iahiko i whakauru, ana ki etahi keehi, ko te ngaohiko titi inea kia rite ki te tata ranei ki te uara noa, kaore pea e taea te whakaatu he pai te ara iahiko whakauru. Na te mea ko etahi hapa ngohengohe kaore e rereke te rereketanga o te ngaohiko DC.

PCB board debugging method

Mo te poari PCB hou i whakahokia mai nei, me maataki ake kia kitea he raru kei runga i te papa, penei mena he kapiti kitea, mena he ara poto, he ara porowhita me etahi atu ahuatanga. If necessary, check that the resistance between the power supply and the ground is large enough.

Mo te poari ara iahiko hou, ko te whakakore i etahi wa ka pa ki etahi uauatanga, ina koa ka nui ake te poari, he maha nga waahanga, kaore i te mohio ki te tiimata. Engari mena he rangatira taau mo te tikanga patuiro totika, ka rua nga wa ka puta te whakakore me te haurua o te mahi.

Te tikanga patuiro poari PCB

1. For the new PCB board just brought back, we should first roughly observe whether there are problems on the board, such as whether there are obvious cracks, whether there are short circuits, open circuits and other phenomena. If necessary, check that the resistance between the power supply and the ground is large enough.

2, ana ko nga waahanga whakauru. Nga waahanga motuhake, ki te kore koe e mohio he pai te mahi, he pai ake kia kaua e whakauru katoa, engari ko tetahi waahanga o te whakauru (mo nga ara iti, ka taea te whakauru i te wa kotahi), kia ngawari ai te whakatau i te he. awhe, kia raru ai koe i nga raru, kaua e mohio me pehea te tiimata.

Generally speaking, you can install the power supply part first, and then check whether the power supply output voltage is normal. Mena kaore koe i te tino mohio i te waa e kaha ana (ahakoa ko koe, ka tohutohuhia koe ki te whakauru i te rehu, mena ka tika), ka taea e koe te whakaaro ki te whakamahi i tetahi kaiwhakawhana hiko hiko e taea ana te whakahaere.

Tuatahi te tautuhi i te ahurutanga o naianei, ana ka neke haere te uara ngaohiko o te mana whakahaere o te kaiwhakahaere, me te tirotiro i te waa whakauru, ngaohiko whakauru me te ngaohiko whakaputa. If no overcurrent protection occurs and the output voltage is normal, the power supply is OK. Ki te kore, momotuhia te hiko, kitea te he, me te whakahou i nga mahi i runga ake ra ano kia noa te mana o te hiko.

3, ka whakauruhia etahi atu waahanga, ia waahanga kua whakauruhia, te kaha ki te whakamatautau, te kaha kia rite ki nga waahanga o runga ake nei, kia kore ai e kaha te tahu, ka tahu nga waahanga na te hapa o te hoahoa me nga hapa whakauru.

Rapua te otinga o te poari PCB he

1. Inea te ngaohiko kia kitea te papa PCB he

Ko te mea tuatahi hei whakatuturu mena ko te ngaohiko o te titi mana maramara he noa, ka tirotiro mena he momo noa nga ngaohiko tohutoro, mena he hiko noa te hiko mahi o ia tohu. Ko te triagon silicon angamaheni, hei tauira, ka whai i te ngaohiko hononga BE o te taha 0.7V me te ngaohiko hononga CE o te 0.3V iti iho ranei. Mena he nui ake te hiko hononga o te triode ki te 0.7V (haunga nga tohu motuhake penei i nga ngongo Darlington), ka tuwhera pea te hononga BE.

2, tikanga tohu weronga kia kitea te he o te poari PCB

Add the signal source to the input end, and then measure the waveform of each point in turn to see whether it is normal to find the fault point. I etahi wa ka whakamahi maatau i tetahi tikanga maamaa, penei i te pupuri i te tweezer kia pa ki te taunga whakauru ki nga taumata katoa kia kite mena he urupare kei te teihana whakaputa, he maha nga wa e whakamahia ana i nga waahanga oro me te riipene whakaata (engari me tuhi. e kore e taea tenei tikanga te whakamahi i roto i nga ara iahiko me nga pereti turanga wera, iahiko hiko teitei ranei, ki te kore ka raru te hiko) Mena kaore he urupare i mua i te pa, ana he urupare i muri o te pa, ka whakaatu ko te raru kei roto i te taumata o mua, me aro ki te tirotiro.

3. Ko etahi atu tikanga mo te rapu papa PCB he

There are many other ways to find trouble spots, such as seeing, hearing, smelling, and touching.

Ko te “Tirohia” he tirotiro mena he tino miihini kino te kino ki nga waahanga, penei i te pakaru, te mangu, te rerekee, me era atu.

Ko te “Whakarongo” he whakarongo mena he oro noa te tangi o te mahi, penei i etahi mea kaua e tangi i te whakakai, kaore e tangi te mowhiti, kaore ranei te tangi i te noa;

Ko te “kakara” he tirotiro mena he kakara, penei i te kakara o te wera, te hiko electrolyte, mo nga kaimahi tiaki hiko mohio, he tino aro ki enei haunga;

“Touch” is to use the hand to test whether the temperature of the device is normal, such as too hot, or too cold.

Ko etahi taputapu hiko, ka mahi ana, ka wera, mena he makariri te pa, ka taea e koe te whakatau kaore e mahi. But if it’s hot where it shouldn’t be or too hot where it should be, that’s no good. General power triode, voltage regulator chip, etc., working in 70 degrees is completely no problem. He aha te tikanga o nga nekehanga 70? If you can hold your hand on it for more than three seconds, the temperature is probably below 70 degrees (be careful not to burn your hand).