{"id":2611,"date":"2023-12-18T18:02:09","date_gmt":"2023-12-18T10:02:09","guid":{"rendered":"https:\/\/www.jingpengpcb.com\/?p=2611"},"modified":"2026-10-02T16:48:33","modified_gmt":"2026-10-02T08:48:33","slug":"pcb-fixed-position-short-circuit","status":"publish","type":"post","link":"https:\/\/www.jingpengpcb.com\/en\/blog\/pcb-fixed-position-short-circuit\/","title":{"rendered":"Causes of Short Circuits at Fixed Points on PCBs and Solutions"},"content":{"rendered":"

Printed circuit boards (PCBs) are used to support and connect various electronic components. Sometimes, PCBs may experience short-circuit issues; one common type of short circuit is a fixed-point short circuit.<\/p>\n

This article will discuss PCB short-circuit issues, specifically the main causes of fixed-point short circuits and measures to address them.<\/p>\n

\"Causes<\/p>\n

Causes of Short Circuits at PCB Mounting Points<\/h2>\n

Short circuits at fixed points on a PCB are typically caused by the following:<\/p>\n

    \n
  1. Film Issues:<\/strong> Photomasks may be subject to issues such as scratches or pinholes. If a damaged photomask is used during PCB fabrication, it may result in inaccurate circuit patterns on the PCB, which could lead to short circuits.<\/li>\n
  2. Screen Clogging:<\/strong> The coating screens used in the PCB manufacturing process may become clogged with debris, preventing the resist from properly covering the designated areas. This can cause the copper on the PCB to become exposed, leading to short circuits.<\/li>\n<\/ol>\n

    Ways to Improve<\/h2>\n

    To reduce the occurrence of short circuits at fixed points, here are some ways to improve the situation:<\/p>\n

      \n
    1. Caring for Film Negatives:<\/strong> Make sure the film negatives are free of pinholes, scratches, and other defects. When storing them, keep the emulsion side facing up to prevent friction with other objects. When registering and copying negatives, ensure that the emulsion side remains undamaged. After use, store the negatives properly in appropriate film pouches.<\/li>\n
    2. Handle film carefully:<\/strong> When aligning, the emulsion side of the film should be aligned with the surface of the PCB. When handling the film, pick it up diagonally with both hands and avoid contact with other objects to prevent damage to the emulsion side. After a certain number of PCBs have been aligned using each film negative, stop the alignment process and have a designated person inspect the film or replace it. Once used, store the film in a suitable film storage bag.<\/li>\n
    3. Operators should pay attention to details:<\/strong> Operators should not wear any jewelry, such as rings or bracelets, while working. Their fingernails should be trimmed and kept clean. The surface of the alignment table should be kept free of clutter and maintained in a clean, smooth condition.<\/li>\n
    4. Inspection and Maintenance of Coating Screens:<\/strong> Before using a coated stencil for PCB production, be sure to conduct a thorough inspection to ensure there are no blocked areas in the stencil. When applying the wet film, perform frequent spot checks to ensure that no debris is clogging the stencil. In addition, if printing has not been performed for some time, several test prints should be made with an empty screen before printing to ensure that the thinner dissolves any dried ink, thereby keeping the screen clear.<\/li>\n<\/ol>\n

      Short circuits at fixed points on PCBs are one of the common issues in PCB manufacturing, but with careful attention and the implementation of appropriate corrective measures, the occurrence of this problem can be effectively reduced.<\/p>\n

      Ensuring the quality of photographic film and coated screens, and maintaining a clean and tidy work environment, will help improve the success rate of PCB manufacturing and reduce the occurrence of short-circuit issues.<\/p>\n

      \n

      5 Frequently Asked Questions (FAQs)<\/strong><\/p>\n

      1. What is a fixed-point short circuit on a PCB?<\/strong><\/p>\n

      A fixed-point short circuit on a PCB occurs when the circuit pattern on the PCB is not properly coated, causing the copper to be exposed, which may lead to a short circuit.<\/p>\n

      2. What are the main causes of short circuits at PCB mounting points?<\/strong><\/p>\n

      The main causes include damaged film negatives and clogged coating screens, which prevent the resist from covering the designated areas.<\/p>\n

      3. How can short circuits at PCB mounting points be prevented?<\/strong><\/p>\n

      Methods for preventing short circuits at PCB mounting points include maintaining the photomask, handling the photomask with care, ensuring operators pay attention to detail, and inspecting and maintaining the coating stencil.<\/p>\n

      4. How do short circuits at PCB mounting points affect electronic devices?<\/strong><\/p>\n

      A short circuit at a fixed point on a PCB can cause the circuit to malfunction or even damage electronic equipment, so it must be resolved promptly.<\/p>\n

      5. How can the success rate of PCB manufacturing be improved?<\/strong><\/p>\n

      The key to improving the success rate of PCB manufacturing is to ensure that every step of the process meets standards, particularly by maintaining strict control over the quality and maintenance of photomasks and coating screens.<\/p>","protected":false},"excerpt":{"rendered":"

      \u5370\u5237\u7ebf\u8def\u677f\uff08PCB\uff09\u7528\u4e8e\u652f\u6301\u548c\u8fde\u63a5\u5404\u79cd\u7535\u5b50\u5143\u4ef6\uff0c\u6709\u65f6 PCB \u53ef\u80fd\u4f1a\u906d\u53d7\u77ed\u8def\u95ee\u9898\u7684\u56f0\u6270\uff0c\u5176\u4e2d\u4e00\u79cd\u5e38\u89c1\u7684\u77ed\u8def\u7c7b\u578b […]<\/p>\n","protected":false},"author":1,"featured_media":8788,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"slim_seo":{"title":"Causes of Short Circuits at Fixed Points on PCBs and Solutions","description":"How can short circuits at fixed positions on PCBs be improved? This article analyzes the causes\u2014such as scratches on photomasks, exposure, and etching\u2014and provides corresponding solutions and preventive measures for mass production."},"_slim_seo_primary_term_category":0,"_slim_seo_primary_term_post_tag":0,"footnotes":""},"categories":[26],"tags":[30,237],"class_list":["post-2611","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-blog","tag-pcb","tag-237"],"_links":{"self":[{"href":"https:\/\/www.jingpengpcb.com\/en\/wp-json\/wp\/v2\/posts\/2611","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.jingpengpcb.com\/en\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.jingpengpcb.com\/en\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.jingpengpcb.com\/en\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.jingpengpcb.com\/en\/wp-json\/wp\/v2\/comments?post=2611"}],"version-history":[{"count":1,"href":"https:\/\/www.jingpengpcb.com\/en\/wp-json\/wp\/v2\/posts\/2611\/revisions"}],"predecessor-version":[{"id":19282,"href":"https:\/\/www.jingpengpcb.com\/en\/wp-json\/wp\/v2\/posts\/2611\/revisions\/19282"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.jingpengpcb.com\/en\/wp-json\/wp\/v2\/media\/8788"}],"wp:attachment":[{"href":"https:\/\/www.jingpengpcb.com\/en\/wp-json\/wp\/v2\/media?parent=2611"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.jingpengpcb.com\/en\/wp-json\/wp\/v2\/categories?post=2611"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.jingpengpcb.com\/en\/wp-json\/wp\/v2\/tags?post=2611"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}