{"id":5598,"date":"2026-05-10T08:19:00","date_gmt":"2026-05-10T00:19:00","guid":{"rendered":"https:\/\/www.topfastpcb.com\/?p=5598"},"modified":"2026-05-06T11:42:59","modified_gmt":"2026-05-06T03:42:59","slug":"inside-pcba-factory-smt-process","status":"publish","type":"post","link":"https:\/\/www.topfastpcb.com\/fi\/blog\/inside-pcba-factory-smt-process\/","title":{"rendered":"PCBA-tehtaan sis\u00e4ll\u00e4: SMT-kokoonpanoprosessi selitetty"},"content":{"rendered":"<p>Mit\u00e4 tapahtuu piirilevyn valmistuksen j\u00e4lkeen?<\/p><p>Kun pelkk\u00e4 levy on valmis, se siirtyy seuraavaan kriittiseen vaiheeseen: <strong>kokoonpano<\/strong>.<\/p><p>PCBA-tehtaan sis\u00e4ll\u00e4 k\u00e4ytet\u00e4\u00e4n pinta-asennustekniikkaa (SMT) komponenttien sijoittamiseen ja juottamiseen piirilevylle eritt\u00e4in tarkasti ja tehokkaasti.<\/p><p>T\u00e4m\u00e4n prosessin ymm\u00e4rt\u00e4minen auttaa sinua:<\/p><ul class=\"wp-block-list\"><li>PCBA-toimittajien arviointi<\/li>\n\n<li>parantaa tuotteiden luotettavuutta<\/li>\n\n<li>v\u00e4hent\u00e4\u00e4 kokoonpanoon liittyvi\u00e4 vikoja<\/li><\/ul><p>Jos verrataan valmistusvaiheita: <strong><a href=\"https:\/\/www.topfastpcb.com\/fi\/blog\/pcb-factory-vs-pcba-factory\/\">PCB Factory vs PCBA Factory<\/a><\/strong><\/p><div class=\"wp-block-image\"><figure class=\"aligncenter size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"600\" height=\"402\" src=\"https:\/\/www.topfastpcb.com\/wp-content\/uploads\/2026\/05\/TOPFAST-1.jpg\" alt=\"TOPFAST\" class=\"wp-image-5593\" srcset=\"https:\/\/www.topfastpcb.com\/wp-content\/uploads\/2026\/05\/TOPFAST-1.jpg 600w, https:\/\/www.topfastpcb.com\/wp-content\/uploads\/2026\/05\/TOPFAST-1-300x201.jpg 300w, https:\/\/www.topfastpcb.com\/wp-content\/uploads\/2026\/05\/TOPFAST-1-18x12.jpg 18w\" sizes=\"auto, (max-width: 600px) 100vw, 600px\" \/><\/figure><\/div><div id=\"ez-toc-container\" class=\"ez-toc-v2_0_74 counter-hierarchy ez-toc-counter ez-toc-custom ez-toc-container-direction\">\n<div class=\"ez-toc-title-container\">\n<p class=\"ez-toc-title\" style=\"cursor:inherit\">Sis\u00e4llysluettelo<\/p>\n<span class=\"ez-toc-title-toggle\"><\/span><\/div>\n<nav><ul class='ez-toc-list ez-toc-list-level-1' ><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-1\" href=\"https:\/\/www.topfastpcb.com\/fi\/blog\/inside-pcba-factory-smt-process\/#What_Is_SMT_Assembly\" >Mik\u00e4 on SMT-kokoonpano?<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-2\" href=\"https:\/\/www.topfastpcb.com\/fi\/blog\/inside-pcba-factory-smt-process\/#Why_SMT_is_widely_used\" >Miksi SMT:t\u00e4 k\u00e4ytet\u00e4\u00e4n laajalti<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-3\" href=\"https:\/\/www.topfastpcb.com\/fi\/blog\/inside-pcba-factory-smt-process\/#Step-by-Step_SMT_Assembly_Process\" >Vaiheittainen SMT-kokoonpanoprosessi<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-4\" href=\"https:\/\/www.topfastpcb.com\/fi\/blog\/inside-pcba-factory-smt-process\/#Step_1_%E2%80%94_Solder_Paste_Printing\" >Vaihe 1 - Juotospastan tulostus<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-5\" href=\"https:\/\/www.topfastpcb.com\/fi\/blog\/inside-pcba-factory-smt-process\/#Key_points\" >Keskeiset kohdat<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-6\" href=\"https:\/\/www.topfastpcb.com\/fi\/blog\/inside-pcba-factory-smt-process\/#Common_issues\" >Yleiset ongelmat<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-7\" href=\"https:\/\/www.topfastpcb.com\/fi\/blog\/inside-pcba-factory-smt-process\/#Step_2_%E2%80%94_Component_Placement_Pick-and-Place\" >Vaihe 2 - Komponenttien sijoittaminen (Pick-and-Place)<\/a><ul class='ez-toc-list-level-4' ><li class='ez-toc-heading-level-4'><a class=\"ez-toc-link ez-toc-heading-8\" href=\"https:\/\/www.topfastpcb.com\/fi\/blog\/inside-pcba-factory-smt-process\/#Features\" >Ominaisuudet<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-4'><a class=\"ez-toc-link ez-toc-heading-9\" href=\"https:\/\/www.topfastpcb.com\/fi\/blog\/inside-pcba-factory-smt-process\/#Why_it_matters\" >Miksi sill\u00e4 on merkityst\u00e4<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-10\" href=\"https:\/\/www.topfastpcb.com\/fi\/blog\/inside-pcba-factory-smt-process\/#Step_3_%E2%80%94_Reflow_Soldering\" >Vaihe 3 - Reflow-juottaminen<\/a><ul class='ez-toc-list-level-4' ><li class='ez-toc-heading-level-4'><a class=\"ez-toc-link ez-toc-heading-11\" href=\"https:\/\/www.topfastpcb.com\/fi\/blog\/inside-pcba-factory-smt-process\/#Process\" >Prosessi<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-4'><a class=\"ez-toc-link ez-toc-heading-12\" href=\"https:\/\/www.topfastpcb.com\/fi\/blog\/inside-pcba-factory-smt-process\/#Key_control_factors\" >Keskeiset valvontatekij\u00e4t<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-13\" href=\"https:\/\/www.topfastpcb.com\/fi\/blog\/inside-pcba-factory-smt-process\/#Step_4_%E2%80%94_AOI_Inspection_Automated_Optical_Inspection\" >Vaihe 4 - AOI-tarkastus (automaattinen optinen tarkastus)<\/a><ul class='ez-toc-list-level-4' ><li class='ez-toc-heading-level-4'><a class=\"ez-toc-link ez-toc-heading-14\" href=\"https:\/\/www.topfastpcb.com\/fi\/blog\/inside-pcba-factory-smt-process\/#Detects\" >Havaitsee<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-15\" href=\"https:\/\/www.topfastpcb.com\/fi\/blog\/inside-pcba-factory-smt-process\/#Step_5_%E2%80%94_Manual_Inspection_and_Rework\" >Vaihe 5 - Manuaalinen tarkastus ja uudelleenty\u00f6st\u00f6<\/a><ul class='ez-toc-list-level-4' ><li class='ez-toc-heading-level-4'><a class=\"ez-toc-link ez-toc-heading-16\" href=\"https:\/\/www.topfastpcb.com\/fi\/blog\/inside-pcba-factory-smt-process\/#Importance\" >T\u00e4rkeys<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-17\" href=\"https:\/\/www.topfastpcb.com\/fi\/blog\/inside-pcba-factory-smt-process\/#Step_6_%E2%80%94_Functional_Testing\" >Vaihe 6 - Toiminnallinen testaus<\/a><ul class='ez-toc-list-level-4' ><li class='ez-toc-heading-level-4'><a class=\"ez-toc-link ez-toc-heading-18\" href=\"https:\/\/www.topfastpcb.com\/fi\/blog\/inside-pcba-factory-smt-process\/#Tests_may_include\" >Testeihin voi sis\u00e4lty\u00e4<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-19\" href=\"https:\/\/www.topfastpcb.com\/fi\/blog\/inside-pcba-factory-smt-process\/#Step_7_%E2%80%94_Final_Inspection_and_Packaging\" >Vaihe 7 - Lopputarkastus ja pakkaus<\/a><ul class='ez-toc-list-level-4' ><li class='ez-toc-heading-level-4'><a class=\"ez-toc-link ez-toc-heading-20\" href=\"https:\/\/www.topfastpcb.com\/fi\/blog\/inside-pcba-factory-smt-process\/#Includes\" >Sis\u00e4lt\u00e4\u00e4<\/a><\/li><\/ul><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-21\" href=\"https:\/\/www.topfastpcb.com\/fi\/blog\/inside-pcba-factory-smt-process\/#Key_Factors_That_Affect_SMT_Quality\" >SMT-laatuun vaikuttavat avaintekij\u00e4t<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-22\" href=\"https:\/\/www.topfastpcb.com\/fi\/blog\/inside-pcba-factory-smt-process\/#1_Solder_Paste_Quality\" >1. Juotospastan laatu<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-23\" href=\"https:\/\/www.topfastpcb.com\/fi\/blog\/inside-pcba-factory-smt-process\/#2_Machine_Accuracy\" >2. Koneen tarkkuus<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-24\" href=\"https:\/\/www.topfastpcb.com\/fi\/blog\/inside-pcba-factory-smt-process\/#3_Temperature_Control\" >3. L\u00e4mp\u00f6tilan s\u00e4\u00e4t\u00f6<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-25\" href=\"https:\/\/www.topfastpcb.com\/fi\/blog\/inside-pcba-factory-smt-process\/#4_PCB_Design\" >4. PCB-suunnittelu<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-26\" href=\"https:\/\/www.topfastpcb.com\/fi\/blog\/inside-pcba-factory-smt-process\/#SMT_vs_Through-Hole_Assembly\" >SMT vs. l\u00e4pireik\u00e4asennus<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-27\" href=\"https:\/\/www.topfastpcb.com\/fi\/blog\/inside-pcba-factory-smt-process\/#How_PCBA_Factories_Ensure_Quality\" >Miten PCBA-tehtaat varmistavat laadun<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-28\" href=\"https:\/\/www.topfastpcb.com\/fi\/blog\/inside-pcba-factory-smt-process\/#Common_SMT_Assembly_Issues\" >Yleiset SMT-kokoonpanoon liittyv\u00e4t ongelmat<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-29\" href=\"https:\/\/www.topfastpcb.com\/fi\/blog\/inside-pcba-factory-smt-process\/#Tombstoning\" >Hautaaminen<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-30\" href=\"https:\/\/www.topfastpcb.com\/fi\/blog\/inside-pcba-factory-smt-process\/#Solder_Bridging\" >Juotos silloitus<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-31\" href=\"https:\/\/www.topfastpcb.com\/fi\/blog\/inside-pcba-factory-smt-process\/#Misalignment\" >Kohdistusvirhe<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-32\" href=\"https:\/\/www.topfastpcb.com\/fi\/blog\/inside-pcba-factory-smt-process\/#Cold_Solder_Joints\" >Kylm\u00e4juotosliitokset<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-33\" href=\"https:\/\/www.topfastpcb.com\/fi\/blog\/inside-pcba-factory-smt-process\/#How_to_Evaluate_a_PCBA_Factory\" >Kuinka arvioida PCBA-tehdasta<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-34\" href=\"https:\/\/www.topfastpcb.com\/fi\/blog\/inside-pcba-factory-smt-process\/#Real-World_Manufacturing_Perspective\" >Todellisen maailman valmistuksen n\u00e4k\u00f6kulma<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-35\" href=\"https:\/\/www.topfastpcb.com\/fi\/blog\/inside-pcba-factory-smt-process\/#Conclusion\" >P\u00e4\u00e4telm\u00e4<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-36\" href=\"https:\/\/www.topfastpcb.com\/fi\/blog\/inside-pcba-factory-smt-process\/#FAQ\" >FAQ<\/a><\/li><\/ul><\/nav><\/div>\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"What_Is_SMT_Assembly\"><\/span>Mik\u00e4 on SMT-kokoonpano?<span class=\"ez-toc-section-end\"><\/span><\/h2><p>SMT (Surface Mount Technology) on menetelm\u00e4, jossa elektroniset komponentit kiinnitet\u00e4\u00e4n suoraan piirilevyn pinnalle.<\/p><h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Why_SMT_is_widely_used\"><\/span>Miksi SMT:t\u00e4 k\u00e4ytet\u00e4\u00e4n laajalti<span class=\"ez-toc-section-end\"><\/span><\/h3><ul class=\"wp-block-list\"><li>tukee korkean tiheyden malleja<\/li>\n\n<li>mahdollistaa automatisoidun tuotannon<\/li>\n\n<li>parantaa suorituskyky\u00e4 ja luotettavuutta<\/li><\/ul><h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Step-by-Step_SMT_Assembly_Process\"><\/span>Vaiheittainen SMT-kokoonpanoprosessi<span class=\"ez-toc-section-end\"><\/span><\/h2><h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Step_1_%E2%80%94_Solder_Paste_Printing\"><\/span>Vaihe 1 - Juotospastan tulostus<span class=\"ez-toc-section-end\"><\/span><\/h3><p>Juotospasta levitet\u00e4\u00e4n piirilevytyynyihin kaavion avulla.<\/p><h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Key_points\"><\/span>Keskeiset kohdat<span class=\"ez-toc-section-end\"><\/span><\/h3><ul class=\"wp-block-list\"><li>Tarkka kohdistus on ratkaisevan t\u00e4rke\u00e4\u00e4<\/li>\n\n<li>Pastan m\u00e4\u00e4r\u00e4 vaikuttaa juotoksen laatuun<\/li><\/ul><h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Common_issues\"><\/span>Yleiset ongelmat<span class=\"ez-toc-section-end\"><\/span><\/h3><ul class=\"wp-block-list\"><li>riitt\u00e4m\u00e4t\u00f6n tahna<\/li>\n\n<li>Virheellinen suuntaus<\/li><\/ul><h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Step_2_%E2%80%94_Component_Placement_Pick-and-Place\"><\/span>Vaihe 2 - Komponenttien sijoittaminen (Pick-and-Place)<span class=\"ez-toc-section-end\"><\/span><\/h3><p>Automaattiset koneet asentavat komponentit piirilevylle.<\/p><h4 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Features\"><\/span>Ominaisuudet<span class=\"ez-toc-section-end\"><\/span><\/h4><ul class=\"wp-block-list\"><li>nopea sijoittelu<\/li>\n\n<li>korkea tarkkuus<\/li>\n\n<li>tukee tuhansia komponentteja<\/li><\/ul><h4 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Why_it_matters\"><\/span>Miksi sill\u00e4 on merkityst\u00e4<span class=\"ez-toc-section-end\"><\/span><\/h4><p>Sijoitustarkkuus vaikuttaa suoraan kokoonpanon laatuun.<\/p><h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Step_3_%E2%80%94_Reflow_Soldering\"><\/span>Vaihe 3 - Reflow-juottaminen<span class=\"ez-toc-section-end\"><\/span><\/h3><p>Piirilevy kulkee reflow-uunin l\u00e4pi.<\/p><h4 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Process\"><\/span>Prosessi<span class=\"ez-toc-section-end\"><\/span><\/h4><ul class=\"wp-block-list\"><li>juotospasta sulaa<\/li>\n\n<li>komponentit liimataan tyynyihin<\/li><\/ul><h4 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Key_control_factors\"><\/span>Keskeiset valvontatekij\u00e4t<span class=\"ez-toc-section-end\"><\/span><\/h4><ul class=\"wp-block-list\"><li>l\u00e4mp\u00f6tilaprofiili<\/li>\n\n<li>l\u00e4mmitysalueet<\/li>\n\n<li>j\u00e4\u00e4hdytysnopeus<\/li><\/ul><p>V\u00e4\u00e4r\u00e4nlainen ohjaus voi aiheuttaa:<\/p><ul class=\"wp-block-list\"><li>kylm\u00e4t juotosliitokset<\/li>\n\n<li>komponentin vaurioituminen<\/li><\/ul><h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Step_4_%E2%80%94_AOI_Inspection_Automated_Optical_Inspection\"><\/span>Vaihe 4 - <a href=\"https:\/\/www.topfastpcb.com\/fi\/blog\/aoi-inspection-in-pcb-manufacturing\/\">AOI<\/a> Tarkastus (automaattinen optinen tarkastus)<span class=\"ez-toc-section-end\"><\/span><\/h3><p>Juottamisen j\u00e4lkeen levy tarkastetaan automaattisesti.<\/p><h4 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Detects\"><\/span>Havaitsee<span class=\"ez-toc-section-end\"><\/span><\/h4><ul class=\"wp-block-list\"><li>puuttuvat osat<\/li>\n\n<li>Virheellinen suuntaus<\/li>\n\n<li>juotosvirheet<\/li><\/ul><p>Tarkastus parantaa tuotosta ja v\u00e4hent\u00e4\u00e4 virheit\u00e4.<\/p><h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Step_5_%E2%80%94_Manual_Inspection_and_Rework\"><\/span>Vaihe 5 - Manuaalinen tarkastus ja uudelleenty\u00f6st\u00f6<span class=\"ez-toc-section-end\"><\/span><\/h3><p>Teknikot tarkistavat levyt ja korjaavat ongelmat tarvittaessa.<\/p><h4 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Importance\"><\/span>T\u00e4rkeys<span class=\"ez-toc-section-end\"><\/span><\/h4><ul class=\"wp-block-list\"><li>varmistaa laadun ennen seuraavia vaiheita<\/li>\n\n<li>havaitsee viat, jotka koneet saattavat j\u00e4tt\u00e4\u00e4 huomaamatta<\/li><\/ul><h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Step_6_%E2%80%94_Functional_Testing\"><\/span>Vaihe 6 - Toiminnallinen testaus<span class=\"ez-toc-section-end\"><\/span><\/h3><p>Koottu piirilevy testataan toimivuuden varmistamiseksi.<\/p><h4 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Tests_may_include\"><\/span>Testeihin voi sis\u00e4lty\u00e4<span class=\"ez-toc-section-end\"><\/span><\/h4><ul class=\"wp-block-list\"><li>s\u00e4hk\u00f6inen testaus<\/li>\n\n<li>signaalin todentaminen<\/li>\n\n<li>toiminnallinen simulointi<\/li><\/ul><h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Step_7_%E2%80%94_Final_Inspection_and_Packaging\"><\/span>Vaihe 7 - Lopputarkastus ja pakkaus<span class=\"ez-toc-section-end\"><\/span><\/h3><p>Levyt tarkastetaan uudelleen ennen l\u00e4hetyst\u00e4.<\/p><h4 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Includes\"><\/span>Sis\u00e4lt\u00e4\u00e4<span class=\"ez-toc-section-end\"><\/span><\/h4><ul class=\"wp-block-list\"><li>silm\u00e4m\u00e4\u00e4r\u00e4inen tarkastus<\/li>\n\n<li>pakkaussuojaus<\/li><\/ul><div class=\"wp-block-image\"><figure class=\"aligncenter size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"600\" height=\"429\" src=\"https:\/\/www.topfastpcb.com\/wp-content\/uploads\/2026\/04\/PCB-Factory-1-2.jpg\" alt=\"PCB-tehdas\" class=\"wp-image-5574\" srcset=\"https:\/\/www.topfastpcb.com\/wp-content\/uploads\/2026\/04\/PCB-Factory-1-2.jpg 600w, https:\/\/www.topfastpcb.com\/wp-content\/uploads\/2026\/04\/PCB-Factory-1-2-300x215.jpg 300w, https:\/\/www.topfastpcb.com\/wp-content\/uploads\/2026\/04\/PCB-Factory-1-2-18x12.jpg 18w\" sizes=\"auto, (max-width: 600px) 100vw, 600px\" \/><\/figure><\/div><h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Key_Factors_That_Affect_SMT_Quality\"><\/span>SMT-laatuun vaikuttavat avaintekij\u00e4t<span class=\"ez-toc-section-end\"><\/span><\/h2><h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"1_Solder_Paste_Quality\"><\/span>1. Juotospastan laatu<span class=\"ez-toc-section-end\"><\/span><\/h3><p>Huono tahna johtaa heikkoihin juotosliitoksiin.<\/p><h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"2_Machine_Accuracy\"><\/span>2. Koneen tarkkuus<span class=\"ez-toc-section-end\"><\/span><\/h3><p>Sijoitustarkkuus on kriittinen pienille komponenteille.<\/p><h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"3_Temperature_Control\"><\/span>3. L\u00e4mp\u00f6tilan s\u00e4\u00e4t\u00f6<span class=\"ez-toc-section-end\"><\/span><\/h3><p>Reflow-profiilin on vastattava komponentin vaatimuksia.<\/p><h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"4_PCB_Design\"><\/span>4. PCB-suunnittelu<span class=\"ez-toc-section-end\"><\/span><\/h3><p>Suunnittelu vaikuttaa kokoonpanon onnistumiseen.<\/p><p>DFM-viite: <strong><a href=\"https:\/\/www.topfastpcb.com\/fi\/blog\/complete-guide-to-pcb-design-for-manufacturability-dfm\/\">PCB Design for Manufacturing -ohjeet<\/a><\/strong><\/p><h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"SMT_vs_Through-Hole_Assembly\"><\/span>SMT vs. l\u00e4pireik\u00e4asennus<span class=\"ez-toc-section-end\"><\/span><\/h2><figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><tr><th>Ominaisuus<\/th><th>SMT<\/th><th>L\u00e4pivientireik\u00e4<\/th><\/tr><\/thead><tbody><tr><td>Tiheys<\/td><td>Korkea<\/td><td>Matala<\/td><\/tr><tr><td>Automaatio<\/td><td>Korkea<\/td><td>Kohtalainen<\/td><\/tr><tr><td>Kustannukset<\/td><td>Alempi (tilavuus)<\/td><td>Korkeampi<\/td><\/tr><tr><td>Luotettavuus<\/td><td>Korkea<\/td><td>Korkea (mekaaninen lujuus)<\/td><\/tr><\/tbody><\/table><\/figure><p>Useimmissa nykyaikaisissa malleissa k\u00e4ytet\u00e4\u00e4n SMT:t\u00e4, joskus yhdistettyn\u00e4 l\u00e4pireik\u00e4\u00e4n.<\/p><h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"How_PCBA_Factories_Ensure_Quality\"><\/span>Miten PCBA-tehtaat varmistavat laadun<span class=\"ez-toc-section-end\"><\/span><\/h2><p>Ammattimainen PCBA-tehtaiden k\u00e4ytt\u00f6:<\/p><ul class=\"wp-block-list\"><li>automaattiset tarkastusj\u00e4rjestelm\u00e4t<\/li>\n\n<li>prosessinohjaus<\/li>\n\n<li>koulutetut teknikot<\/li><\/ul><p>Laatuviite: <a href=\"https:\/\/www.topfastpcb.com\/fi\/blog\/pcb-quality-and-reliability\/\"><strong>PCB Quality and Reliability Guide<\/strong><\/a><\/p><h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Common_SMT_Assembly_Issues\"><\/span>Yleiset SMT-kokoonpanoon liittyv\u00e4t ongelmat<span class=\"ez-toc-section-end\"><\/span><\/h2><h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Tombstoning\"><\/span>Hautaaminen<span class=\"ez-toc-section-end\"><\/span><\/h3><p>Komponentti nousee juottamisen aikana.<\/p><h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Solder_Bridging\"><\/span>Juotos silloitus<span class=\"ez-toc-section-end\"><\/span><\/h3><p>Ylim\u00e4\u00e4r\u00e4isen juotteen aiheuttamat oikosulut.<\/p><h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Misalignment\"><\/span>Kohdistusvirhe<span class=\"ez-toc-section-end\"><\/span><\/h3><p>V\u00e4\u00e4r\u00e4 komponenttien sijoittelu.<\/p><h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Cold_Solder_Joints\"><\/span>Kylm\u00e4juotosliitokset<span class=\"ez-toc-section-end\"><\/span><\/h3><p>Heikot s\u00e4hk\u00f6liit\u00e4nn\u00e4t.<\/p><h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"How_to_Evaluate_a_PCBA_Factory\"><\/span>Kuinka arvioida PCBA-tehdasta<span class=\"ez-toc-section-end\"><\/span><\/h2><p>Tarkista ennen kumppanin valintaa:<\/p><ul class=\"wp-block-list\"><li>SMT-linjan valmiudet<\/li>\n\n<li>tarkastusj\u00e4rjestelm\u00e4t (AOI, r\u00f6ntgen)<\/li>\n\n<li>tekninen tuki<\/li>\n\n<li>kokemus vastaavista hankkeista<\/li><\/ul><h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Real-World_Manufacturing_Perspective\"><\/span>Todellisen maailman valmistuksen n\u00e4k\u00f6kulma<span class=\"ez-toc-section-end\"><\/span><\/h2><p>Luotettava PCBA-tehdas keskittyy nopeuden lis\u00e4ksi my\u00f6s johdonmukaisuuteen ja prosessinohjaukseen.<\/p><p>Sellaisilla valmistajilla kuin <strong>TOPFAST<\/strong>, SMT-kokoonpanoon kuuluu koordinoitu prosessinohjaus, tarkastusj\u00e4rjestelm\u00e4t ja tekninen tuki, joilla varmistetaan vakaa ja toistettava tuotantolaatu.<\/p><div class=\"wp-block-image\"><figure class=\"aligncenter size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"600\" height=\"461\" src=\"https:\/\/www.topfastpcb.com\/wp-content\/uploads\/2026\/04\/PCB-Factory-3-1.jpg\" alt=\"PCB-tehdas\" class=\"wp-image-5576\" srcset=\"https:\/\/www.topfastpcb.com\/wp-content\/uploads\/2026\/04\/PCB-Factory-3-1.jpg 600w, https:\/\/www.topfastpcb.com\/wp-content\/uploads\/2026\/04\/PCB-Factory-3-1-300x231.jpg 300w, https:\/\/www.topfastpcb.com\/wp-content\/uploads\/2026\/04\/PCB-Factory-3-1-16x12.jpg 16w\" sizes=\"auto, (max-width: 600px) 100vw, 600px\" \/><\/figure><\/div><h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Conclusion\"><\/span>P\u00e4\u00e4telm\u00e4<span class=\"ez-toc-section-end\"><\/span><\/h2><p>SMT-kokoonpano on monimutkainen ja eritt\u00e4in tarkka prosessi, jolla on t\u00e4rke\u00e4 rooli nykyaikaisessa elektroniikan valmistuksessa.<\/p><p>SMT:n toiminnan ymm\u00e4rt\u00e4minen auttaa insin\u00f6\u00f6rej\u00e4 ja ostajia tekem\u00e4\u00e4n parempia p\u00e4\u00e4t\u00f6ksi\u00e4, v\u00e4hent\u00e4m\u00e4\u00e4n riskej\u00e4 ja varmistamaan korkealaatuisen piirilevykokoonpanon.<\/p><p>Valitsemalla osaavan PCBA-tehtaan varmistat johdonmukaiset tulokset ja luotettavan tuotesuorituksen.<\/p><h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"FAQ\"><\/span>FAQ<span class=\"ez-toc-section-end\"><\/span><\/h2><div class=\"schema-faq wp-block-yoast-faq-block\"><div class=\"schema-faq-section\" id=\"faq-question-1778038270777\"><strong class=\"schema-faq-question\">K: Mik\u00e4 on SMT PCB-kokoonpanossa?<\/strong> <p class=\"schema-faq-answer\">V: SMT on menetelm\u00e4, jossa komponentit kiinnitet\u00e4\u00e4n suoraan piirilevyn pinnalle.<\/p> <\/div> <div class=\"schema-faq-section\" id=\"faq-question-1778038323454\"><strong class=\"schema-faq-question\">K: Mik\u00e4 on SMT-prosessi vaihe vaiheelta?<\/strong> <p class=\"schema-faq-answer\">V: Se sis\u00e4lt\u00e4\u00e4 juotospastan tulostuksen, komponenttien sijoittamisen, uudelleenjuottamisen, tarkastuksen ja testauksen.<\/p> <\/div> <div class=\"schema-faq-section\" id=\"faq-question-1778038332949\"><strong class=\"schema-faq-question\">K: Miksi SMT on t\u00e4rke\u00e4\u00e4?<\/strong> <p class=\"schema-faq-answer\">V: Se mahdollistaa tihe\u00e4n, automatisoidun ja luotettavan PCB-kokoonpanon.<\/p> <\/div> <div class=\"schema-faq-section\" id=\"faq-question-1778038417118\"><strong class=\"schema-faq-question\">K: Mit\u00e4 eroa on SMT- ja DIP-korttien v\u00e4lill\u00e4?<\/strong> <p class=\"schema-faq-answer\">V: SMT asentaa komponentit pintaan, kun taas DIP k\u00e4ytt\u00e4\u00e4 l\u00e4pireiki\u00e4.<\/p> <\/div> <div class=\"schema-faq-section\" id=\"faq-question-1778038448161\"><strong class=\"schema-faq-question\">K: Mik\u00e4 aiheuttaa vikoja SMT-kokoonpanossa?<\/strong> <p class=\"schema-faq-answer\">V: Yleisi\u00e4 syit\u00e4 ovat huono juotospasta, v\u00e4\u00e4r\u00e4 l\u00e4mp\u00f6tila ja virheellinen suuntaus.<\/p> <\/div> <div class=\"schema-faq-section\" id=\"faq-question-1778038464082\"><strong class=\"schema-faq-question\">K: Miten PCBA-tehtaat varmistavat laadun?<\/strong> <p class=\"schema-faq-answer\">V: Ne k\u00e4ytt\u00e4v\u00e4t tarkastusj\u00e4rjestelmi\u00e4, kuten <a href=\"https:\/\/www.topfastpcb.com\/fi\/blog\/aoi-inspection-in-pcb-manufacturing\/\">AOI<\/a>, <a href=\"https:\/\/www.topfastpcb.com\/fi\/blog\/x-ray-inspection-in-pcb-manufacturing\/\">R\u00f6ntgenkuvaus<\/a>ja toiminnallinen testaus.<\/p> <\/div> <\/div>","protected":false},"excerpt":{"rendered":"<p>The SMT (Surface Mount Technology) assembly process is at the heart of modern PCBA manufacturing. This article provides a step-by-step walkthrough of the SMT process inside a PCBA factory, including solder paste printing, component placement, reflow soldering, and inspection. It helps engineers and buyers understand how assembly quality is achieved and what to look for when choosing a PCBA partner.<\/p>","protected":false},"author":1,"featured_media":5586,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[108],"tags":[456],"class_list":["post-5598","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-news","tag-pcba-factory"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v25.1 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Inside a PCBA Factory: SMT Assembly Process Step-by-Step Explained<\/title>\n<meta name=\"description\" content=\"Explore the SMT assembly process inside a PCBA factory. 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What is SMT in PCB assembly?\",\"answerCount\":1,\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"A: SMT is a method of mounting components directly onto the surface of a PCB.\",\"inLanguage\":\"fi\"},\"inLanguage\":\"fi\"},{\"@type\":\"Question\",\"@id\":\"https:\/\/www.topfastpcb.com\/blog\/inside-pcba-factory-smt-process\/#faq-question-1778038323454\",\"position\":2,\"url\":\"https:\/\/www.topfastpcb.com\/blog\/inside-pcba-factory-smt-process\/#faq-question-1778038323454\",\"name\":\"Q: What is the SMT process step by step?\",\"answerCount\":1,\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"A: It includes solder paste printing, component placement, reflow soldering, inspection, and 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