{"id":2315,"date":"2026-10-05T13:00:00","date_gmt":"2026-10-05T05:00:00","guid":{"rendered":"https:\/\/www.jingpengpcb.com\/?p=2315"},"modified":"2026-10-15T08:01:49","modified_gmt":"2026-10-15T00:01:49","slug":"9-basic-pcb-test-tips","status":"publish","type":"post","link":"https:\/\/www.jingpengpcb.com\/en\/blog\/9-basic-pcb-test-tips\/","title":{"rendered":"What Are the 9 Key Points to Keep in Mind When Testing Circuit Boards? Live Substrates, Soldering Irons, and IC Principles"},"content":{"rendered":"<style>\n.jp-tw{overflow-x:auto;margin:26px 0;-webkit-overflow-scrolling:touch;}\n.jp-tw table{border-collapse:collapse;width:100%;min-width:560px;font-size:15px;line-height:1.65;background:#fff;}\n.jp-tw th,.jp-tw td{border:1px solid #dde3ea;padding:11px 14px;text-align:left;vertical-align:top;}\n.jp-tw thead th{background:#eef2f7;color:#1b2733;font-weight:700;white-space:nowrap;border-bottom:2px solid #c9d3de;}\n.jp-tw tbody tr:nth-child(even){background:#fafbfc;}\n.jp-tw tbody tr:hover{background:#f1f5fa;}\n.jp-tw tbody td:first-child{font-weight:600;color:#1b2733;}\n@media(max-width:767px){.jp-tw table{font-size:14px;min-width:520px;}.jp-tw th,.jp-tw td{padding:9px 11px;}}\n<\/style>\n<p>Printed circuit boards (PCBs) play a crucial role in modern electronic devices. To ensure product quality and performance, it is important to pay attention to certain details when inspecting PCBs. In this article, we will share nine tips to help you gain a more comprehensive understanding of the PCB inspection process and how to ensure it runs smoothly.<\/p>\n<h2>1. Precautions for Testing Televisions, Audio Systems, and Other Devices<\/h2>\n<h3>1.1 Avoid Contact with the Live Base Plate<\/h3>\n<p>When testing PCBs, never use grounded test equipment to touch live televisions, audio systems, or video equipment. In particular, when working with devices that have high output power or whose power supply characteristics are unknown, be sure to check whether the device\u2019s chassis is live. Failure to do so may cause a power supply short circuit, which could damage integrated circuits and exacerbate the scope of the malfunction.<\/p>\n<h2>2. Insulation Properties of Soldering Irons<\/h2>\n<h3>2.1 Choose a soldering iron with good insulation<\/h3>\n<p>When inspecting PCBs, never solder with a powered soldering iron. Make sure the soldering iron is powered, and it is best to ground the soldering iron\u2019s casing. Extra caution is required for MOS circuits; it is best to use a low-voltage soldering iron (6\u20138 V) to ensure safety.<\/p>\n<h2>3. Understand how integrated circuits work<\/h2>\n<h3>3.1 Understanding the Operating Principles of Integrated Circuits<\/h3>\n<p>Before inspecting and repairing an integrated circuit, it is essential to gain a thorough understanding of the circuit\u2019s functions, internal circuitry, key electrical parameters, and the roles of its pins. Understanding the normal voltages and waveforms at the pins, as well as how they interact with external components, can greatly simplify the analysis and inspection process.<\/p>\n<h2>Advanced: The first three tips are all about preventing \"further escalation of the problem.\"<\/h2>\n<p>The first three points in the original text have one thing in common: they are not intended to improve measurement accuracy, but rather to prevent the scope of the malfunction from expanding. First, never use grounded test equipment to touch live televisions, audio systems, or video equipment. Be sure to check whether the equipment\u2019s chassis is live; otherwise, it may cause a power supply short circuit, which could damage the integrated circuits and widen the scope of the malfunction. Second, never use a live soldering iron for soldering; it is best to ground the soldering iron\u2019s casing. Extra caution is required when working with MOS circuits; it is best to use a low-voltage soldering iron rated at 6\u20138 V. Third, before inspecting or repairing an integrated circuit, gain a thorough understanding of its function, internal circuitry, key electrical parameters, and the roles of its pins. Understanding the normal voltages and waveforms at the pins, as well as the operating principles of the peripheral components, can greatly simplify the analysis and inspection process.<\/p>\n<div class=\"jp-tw\">\n<table>\n<thead>\n<tr>\n<th>Entry<\/th>\n<th>Requirements in the original text<\/th>\n<th>Preventing Risks<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>1. Live Base Plate<\/td>\n<td>Do not use grounded test equipment to touch live equipment; check whether the base plate is live.<\/td>\n<td>Power supply short circuit, failure propagation<\/td>\n<\/tr>\n<tr>\n<td>2. Soldering Iron Insulation<\/td>\n<td>No need to bring a powered soldering iron; the case is grounded; use a 6\u20138 V low-voltage soldering iron for the MOS circuit.<\/td>\n<td>The device broke down<\/td>\n<\/tr>\n<tr>\n<td>3. Understanding the Principles of ICs<\/td>\n<td>First, familiarize yourself with the functions, internal circuitry, electrical specifications, and pin functions.<\/td>\n<td>Analysis of Misjudgments and Invalid Cases<\/td>\n<\/tr>\n<tr>\n<td>Common Characteristics<\/td>\n<td>These are all part of the preparations before the test.<\/td>\n<td>Avoid letting minor problems turn into major ones<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<ul>\n<li><strong>Special care must be taken with equipment that has high output power or whose power supply characteristics are unknown.<\/strong>: The original text uses \u201cespecially\u201d for emphasis;<\/li>\n<li><strong>Grounding the soldering iron's casing is the method specified in the original text.<\/strong>: Not an option;<\/li>\n<li><strong>MOS circuits were singled out<\/strong>: The original text specifies a low-voltage circuit;<\/li>\n<li><strong>Normal pin voltages and waveforms serve as the basis for analysis<\/strong>: The original text lists this as the key to simplification;<\/li>\n<li><strong>All three were completed before work began.<\/strong>: This is part of the preparation phase, not the measurement phase.<\/li>\n<\/ul>\n<p><img loading=\"lazy\" decoding=\"async\" width=\"1280\" height=\"719\" class=\"alignnone size-large wp-image-8629\" src=\"https:\/\/www.jingpengpcb.com\/wp-content\/uploads\/2023\/08\/pcb-assembly-testing.jpg\" alt=\"Why Is PCB Assembly and Testing Necessary?\" srcset=\"https:\/\/www.jingpengpcb.com\/wp-content\/uploads\/2023\/08\/pcb-assembly-testing.jpg 1280w, https:\/\/www.jingpengpcb.com\/wp-content\/uploads\/2023\/08\/pcb-assembly-testing-300x169.jpg 300w, https:\/\/www.jingpengpcb.com\/wp-content\/uploads\/2023\/08\/pcb-assembly-testing-1024x575.jpg 1024w, https:\/\/www.jingpengpcb.com\/wp-content\/uploads\/2023\/08\/pcb-assembly-testing-768x431.jpg 768w\" sizes=\"auto, (max-width: 1280px) 100vw, 1280px\" \/><\/p>\n<p>See PCBA Testing<a href=\"\/en\/pcba-testing\/\">PCBA Testing<\/a>; For assembly and testing, see<a href=\"\/en\/blog\/pcb-assembly-testing\/\">Why Is PCB Assembly and Testing Necessary?<\/a>\u3002<\/p>\n<h2>4. Avoid short circuits between pins<\/h2>\n<h3>4.1 Caution: Voltage Measurement<\/h3>\n<p>When measuring voltage or using an oscilloscope probe to test waveforms, be sure to exercise caution to avoid short circuits between integrated circuit pins caused by the test leads or probes slipping. It is best to take measurements on the peripheral printed circuit board that is directly connected to the pins to minimize the risk of accidental damage to the integrated circuit.<\/p>\n<h2>5. Pay attention to the internal resistance of the test instrument<\/h2>\n<h3>5.1 Use a multimeter with an internal resistance greater than 20 k\u03a9\/V<\/h3>\n<p>When measuring DC voltage across the pins of an integrated circuit, you should use a multimeter with an internal resistance greater than 20 k\u03a9\/V to minimize the possibility of measurement errors.<\/p>\n<h2>6. Ensure proper heat dissipation for power integrated circuits<\/h2>\n<h3>6.1 Focus on Heat Dissipation in Power Integrated Circuits<\/h3>\n<p>Power integrated circuits generate heat during operation, so it is essential to ensure proper heat dissipation. When operating at high power, a heat sink is absolutely essential.<\/p>\n<h2>Advanced: Four Quantitative Requirements for the Measurement Phase<\/h2>\n<p>The original text provides specific guidelines for the measurement process: When measuring voltage or using an oscilloscope probe to test waveforms, be sure to avoid short circuits between integrated circuit pins caused by slipping test leads or probes; it is best to take measurements on the peripheral printed circuit board directly connected to the pins; When measuring DC voltage across integrated circuit pins, select a multimeter with an internal resistance greater than 20 k\u03a9\/V to minimize measurement error; Power integrated circuits must never operate under high-power conditions without a heat sink; If external components need to be connected to replace damaged internal parts of the integrated circuit, select small-sized components and ensure proper connections to avoid unnecessary parasitic coupling. Pay particular attention to the grounding connections between the audio power amplifier integrated circuit and the preamplifier circuit.<\/p>\n<div class=\"jp-tw\">\n<table>\n<thead>\n<tr>\n<th>Entry<\/th>\n<th>Original Metrics\/Methods<\/th>\n<th>Purpose<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>4. Short circuit between pins<\/td>\n<td>Measurements taken on the peripheral printed circuit board directly connected to the pins<\/td>\n<td>Reducing the Risk of Accidental Damage to Integrated Circuits<\/td>\n<\/tr>\n<tr>\n<td>5. Instrument Internal Resistance<\/td>\n<td>A multimeter with an internal resistance greater than 20 k\u03a9\/V<\/td>\n<td>Minimize Measurement Errors<\/td>\n<\/tr>\n<tr>\n<td>6. Power IC Cooling<\/td>\n<td>A heat sink is required during high-power operation.<\/td>\n<td>Export Work Heat<\/td>\n<\/tr>\n<tr>\n<td>7. Lead Termination<\/td>\n<td>Use small components and ensure proper connections<\/td>\n<td>Avoiding Parasitic Coupling<\/td>\n<\/tr>\n<tr>\n<td>7. Special Notice<\/td>\n<td>Pay attention to the ground connection between the audio amplifier IC and the preamplifier circuit<\/td>\n<td>Avoid Improper Grounding<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<ol>\n<li>Before taking a measurement, make sure the test leads and probes won't slip;<\/li>\n<li>Prioritize placing components on the outer printed circuit board;<\/li>\n<li>Verify that the multimeter's internal resistance is greater than 20 k\u03a9\/V;<\/li>\n<li>Under high-power operating conditions, check that the radiator is properly installed;<\/li>\n<li>Select a smaller replacement component and verify the ground connection.<\/li>\n<\/ol>\n<p><img loading=\"lazy\" decoding=\"async\" width=\"515\" height=\"389\" class=\"alignnone size-large wp-image-6789\" src=\"https:\/\/www.jingpengpcb.com\/wp-content\/uploads\/2023\/08\/Faulty-soldering.png\" alt=\"Cold solder joint\" srcset=\"https:\/\/www.jingpengpcb.com\/wp-content\/uploads\/2023\/08\/Faulty-soldering.png 515w, https:\/\/www.jingpengpcb.com\/wp-content\/uploads\/2023\/08\/Faulty-soldering-300x227.png 300w\" sizes=\"auto, (max-width: 515px) 100vw, 515px\" \/><\/p>\n<p>For information on cold joints and welding defects, see<a href=\"\/en\/blog\/pcb-soldering-defects-analysis-solutions\/\">Analysis of Causes and Solutions for PCB Soldering Defects<\/a>; For welding techniques, see<a href=\"\/en\/blog\/tips-for-soldering-pcb-circuit-boards\/\">What Are Some Tips for Soldering PCBs?<\/a>\u3002<\/p>\n<h2>7. Properly Route the Leads<\/h2>\n<h3>7.1 Using Small Components<\/h3>\n<p>If you need to connect external components to replace damaged parts inside an integrated circuit, choose small components and ensure they are connected properly to avoid unnecessary parasitic coupling. Pay special attention to the grounding connections between the audio amplifier integrated circuit and the preamplifier circuit.<\/p>\n<h2>8. Ensure Welding Quality<\/h2>\n<h3>8.1 Ensure a Secure Weld<\/h3>\n<p>During the soldering process, be sure to ensure a secure solder joint. Excess solder buildup and porosity can lead to cold solder joints. Soldering time should generally not exceed 3 seconds, and the soldering iron should be set to a moderate power of approximately 25W. Carefully inspect the soldered integrated circuit. It is best to use an ohmmeter to check for short circuits between the pins and ensure there is no solder bridging before applying power.<\/p>\n<h2>9. Do not assume that an integrated circuit is damaged without proper evaluation<\/h2>\n<h3>9.1 Carefully Assessing Integrated Circuit Damage<\/h3>\n<p>Do not jump to the conclusion that the integrated circuit is damaged. Since most integrated circuits are directly coupled, a malfunction in one part may cause voltage fluctuations in multiple locations; however, these fluctuations are not necessarily caused by damage to the integrated circuit. Therefore, when determining whether an integrated circuit is functioning properly, it is necessary to consider a variety of factors comprehensively.<\/p>\n<h2>PCB Debugging Methods<\/h2>\n<p>When debugging PCBs, the following methods can help you troubleshoot issues more efficiently:<\/p>\n<h3>1. Observation and Initial Examination<\/h3>\n<p>First, when you receive a new PCB, carefully inspect it for any obvious issues, such as cracks, short circuits, or open circuits. You can also check whether the resistance between the power supply and ground is within the normal range.<\/p>\n<h3>2. Install the components one by one<\/h3>\n<p>When debugging a newly designed circuit board, it is best to install components one at a time. For standalone modules, if you are unsure whether they are functioning properly, it is best to install them in batches so you can pinpoint the source of the problem.<\/p>\n<h3>3. Testing the Power Supply Section<\/h3>\n<p>First, install the power supply section and test whether the output voltage is normal. When powering up the system, it is recommended to use an adjustable regulated power supply with current-limiting protection to prevent potential overcurrent issues. Gradually adjust the voltage while monitoring the input current, input voltage, and output voltage to ensure that the power supply section is functioning properly.<\/p>\n<h3>4. Install the other modules one by one<\/h3>\n<p>As debugging progresses, install the other modules one by one, and power up the system for testing after each installation. This helps identify design or installation errors early on to prevent component damage.<\/p>\n<h2>Advanced: The Three Welding Parameters and Why Defects Are Hard to Detect<\/h2>\n<p>The original text provides three practical guidelines for soldering: excessive solder buildup and porosity can lead to cold solder joints; soldering time should generally not exceed 3 seconds; and the soldering iron should be set to a moderate power level, around 25W. After soldering, a thorough inspection is required. It is best to use an ohmmeter to check for short circuits between the pins and ensure there is no solder bridging before applying power. Rule 9 cautions against jumping to the conclusion that an integrated circuit is damaged\u2014since most integrated circuits are directly coupled, a malfunction in one part may cause voltage fluctuations in multiple locations, but these fluctuations are not necessarily caused by damage to the integrated circuit; a comprehensive assessment of multiple factors is required when making a judgment.<\/p>\n<div class=\"jp-tw\">\n<table>\n<thead>\n<tr>\n<th>Project<\/th>\n<th>Original Values\/Requirements<\/th>\n<th>Note<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>Welding Time<\/td>\n<td>It should generally not exceed 3 seconds.<\/td>\n<td>Overheating Protection<\/td>\n<\/tr>\n<tr>\n<td>Soldering Iron Power<\/td>\n<td>Moderate, around 25W<\/td>\n<td>Matching the Thermal Requirements of Solder Joints<\/td>\n<\/tr>\n<tr>\n<td>Causes of Poor Solder Joints<\/td>\n<td>Solder Buildup and Pores<\/td>\n<td>A visual inspection is required<\/td>\n<\/tr>\n<tr>\n<td>Post-Weld Inspection<\/td>\n<td>Use an ohmmeter to check for short circuits between the pins.<\/td>\n<td>Make sure there is no solder residue before turning the power back on.<\/td>\n<\/tr>\n<tr>\n<td>Do not be quick to write things off as a loss<\/td>\n<td>Most integrated circuits are directly coupled, so a single anomaly can cause voltage fluctuations in multiple locations.<\/td>\n<td>A comprehensive assessment is required.<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<ul>\n<li><strong>\"3 seconds\" and \"25W\" are the two most specific values in the entire text.<\/strong>: Can be used directly as a work standard;<\/li>\n<li><strong>After welding, use an ohmmeter first, then turn on the power.<\/strong>: The order given in the original text;<\/li>\n<li><strong>Excess material buildup and porosity are the two main causes of cold solder joints.<\/strong>: Parallel structure in the original text;<\/li>\n<li><strong>Direct coupling is the technical root cause of misjudgment<\/strong>: The original text cites this as a reason not to readily write off a loss;<\/li>\n<li><strong>Damages must be determined by taking multiple factors into account.<\/strong>: The original text concludes with the phrase \u201ctaking all factors into consideration.\u201d<\/li>\n<\/ul>\n<p><img loading=\"lazy\" decoding=\"async\" width=\"436\" height=\"463\" class=\"alignnone size-large wp-image-7597\" src=\"https:\/\/www.jingpengpcb.com\/wp-content\/uploads\/2023\/09\/product-pcba-e1758984310302.webp\" alt=\"PCB Soldering\" srcset=\"https:\/\/www.jingpengpcb.com\/wp-content\/uploads\/2023\/09\/product-pcba-e1758984310302.webp 436w, https:\/\/www.jingpengpcb.com\/wp-content\/uploads\/2023\/09\/product-pcba-e1758984310302-283x300.webp 283w\" sizes=\"auto, (max-width: 436px) 100vw, 436px\" \/><\/p>\n<p>For troubleshooting poor soldering, see<a href=\"\/en\/blog\/reasons-and-troubleshooting-methods-for-tin-defects-on-pcb\/\">Causes of Poor Soldering on PCBs and Troubleshooting Methods<\/a>; See the Quality Assurance section<a href=\"\/en\/quality\/\">Quality Assurance<\/a>\u3002<\/p>\n<h2>Methods for Troubleshooting<\/h2>\n<p>When a problem occurs, the following methods can help you quickly pinpoint the source of the problem:<\/p>\n<h3>1. Voltage Measurement Method<\/h3>\n<p>First, measure the voltages at the power supply pins of each chip to ensure they are normal. Check the various reference voltages and the operating voltages at each point. Abnormal voltages may indicate an open circuit at a pin or other issues.<\/p>\n<h3>2. Signal Injection Method<\/h3>\n<p>To troubleshoot the problem, measure the waveforms at each point along the signal source input circuit one by one. If a particular module does not respond normally, that may be the source of the problem.<\/p>\n<h3>3. Other Methods<\/h3>\n<p>You can also use your senses\u2014such as sight, hearing, smell, and touch\u2014to troubleshoot the problem. Check for damaged components, listen for unusual operating noises, check for strange odors, and feel for abnormal temperatures.<\/p>\n<p>In summary, PCB testing is a complex and critical process that requires meticulous attention to detail. By following the tips and troubleshooting methods outlined above, you can better ensure the quality and performance of your PCBs to meet product requirements.<\/p>\n<h2>Advanced: The Four-Step Debugging Method and Three Types of Troubleshooting Techniques<\/h2>\n<p>The original text breaks down the debugging process into four steps: Upon receiving a new PCB, first carefully inspect it for any obvious issues, such as cracks, short circuits, or open circuits, and check whether the resistance between the power supply and ground is normal; when debugging a newly designed circuit board, it is best to install components step by step, installing individual modules in batches to narrow down the source of the fault; First, install the power supply section and test whether the output voltage is normal. When powering up, it is recommended to use an adjustable regulated power supply with current-limiting protection; gradually adjust the voltage while monitoring the input current, input voltage, and output voltage; then gradually install the other modules, powering up and testing after each installation to detect design or installation errors as early as possible. Three methods are provided for troubleshooting: the voltage measurement method, which involves first measuring the voltages at each chip\u2019s power pins, the reference voltage, and the operating voltages at various points; the signal injection method, which involves injecting a signal from the input and measuring the waveforms at each point one by one; and other methods, such as visual inspection, auditory checks, olfactory checks, and tactile checks.<\/p>\n<div class=\"jp-tw\">\n<table>\n<thead>\n<tr>\n<th>Category<\/th>\n<th>Original Method<\/th>\n<th>Criteria<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>Debugging 1<\/td>\n<td>Observation and Initial Examination<\/td>\n<td>Cracks, short circuits, open circuits; resistance between the power supply and ground<\/td>\n<\/tr>\n<tr>\n<td>Debugging 2<\/td>\n<td>Install the components one by one<\/td>\n<td>Install the modules in batches to determine the scope of the failure<\/td>\n<\/tr>\n<tr>\n<td>Debugging 3<\/td>\n<td>Power Supply Testing<\/td>\n<td>Use an adjustable regulated power supply with current-limiting protection to monitor three parameters<\/td>\n<\/tr>\n<tr>\n<td>Debugging 4<\/td>\n<td>\u9010\u6b65\u5b89\u88c5\u5176\u4ed6\u6a21\u5757<\/td>\n<td>\u6bcf\u6b21\u5b89\u88c5\u540e\u4e0a\u7535\u6d4b\u8bd5<\/td>\n<\/tr>\n<tr>\n<td>\u5bfb\u6545\u969c 1<\/td>\n<td>\u6d4b\u91cf\u7535\u538b\u6cd5<\/td>\n<td>\u5f02\u5e38\u7535\u538b\u63d0\u793a\u5f15\u811a\u5f00\u8def\u6216\u5176\u4ed6\u95ee\u9898<\/td>\n<\/tr>\n<tr>\n<td>\u5bfb\u6545\u969c 2<\/td>\n<td>Signal Injection Method<\/td>\n<td>\u67d0\u6a21\u5757\u65e0\u6b63\u5e38\u54cd\u5e94\u5373\u4e3a\u7591\u4f3c\u6545\u969c\u70b9<\/td>\n<\/tr>\n<tr>\n<td>\u5bfb\u6545\u969c 3<\/td>\n<td>\u89c2\u5bdf\u3001\u542c\u89c9\u3001\u55c5\u89c9\u3001\u89e6\u89c9<\/td>\n<td>\u5143\u4ef6\u635f\u574f\u3001\u58f0\u97f3\u3001\u6c14\u5473\u3001\u6e29\u5ea6<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<ol>\n<li>\u5148\u76ee\u89c6\u68c0\u67e5\u88c2\u75d5\u3001\u77ed\u8def\u3001\u5f00\u8def\u5e76\u6d4b\u7535\u6e90\u4e0e\u5730\u7535\u963b\uff1b<\/li>\n<li>\u6309\u6a21\u5757\u5206\u6279\u5b89\u88c5\u5143\u4ef6\uff1b<\/li>\n<li>\u5148\u8c03\u7535\u6e90\uff0c\u7528\u9650\u6d41\u53ef\u8c03\u7a33\u538b\u7535\u6e90\u9010\u6b65\u5347\u538b\uff1b<\/li>\n<li>\u6bcf\u88c5\u4e00\u4e2a\u6a21\u5757\u5c31\u4e0a\u7535\u6d4b\u8bd5\u4e00\u6b21\uff1b<\/li>\n<li>\u51fa\u6545\u969c\u5148\u6d4b\u7535\u538b\uff0c\u518d\u4fe1\u53f7\u6ce8\u5165\u5b9a\u4f4d\uff1b<\/li>\n<li>\u8f85\u4ee5\u770b\u3001\u542c\u3001\u95fb\u3001\u6478\u7b49\u624b\u6bb5\u3002<\/li>\n<\/ol>\n<p><img loading=\"lazy\" decoding=\"async\" width=\"960\" height=\"480\" class=\"alignnone size-large wp-image-749\" src=\"https:\/\/www.jingpengpcb.com\/wp-content\/uploads\/2023\/06\/quality.jpg\" alt=\"PCB\u54c1\u8d28\" srcset=\"https:\/\/www.jingpengpcb.com\/wp-content\/uploads\/2023\/06\/quality.jpg 960w, https:\/\/www.jingpengpcb.com\/wp-content\/uploads\/2023\/06\/quality-300x150.jpg 300w, https:\/\/www.jingpengpcb.com\/wp-content\/uploads\/2023\/06\/quality-768x384.jpg 768w\" sizes=\"auto, (max-width: 960px) 100vw, 960px\" \/><\/p>\n<p>SMT \u5916\u89c2\u68c0\u6d4b\u89c1<a href=\"\/en\/blog\/smt-processing-quality-and-appearance-inspection\/\">SMT Manufacturing Quality and Visual Inspection<\/a>\uff1b\u8c03\u8bd5\u65b9\u6cd5\u89c1<a href=\"\/en\/blog\/debugging-pcb-circuits\/\">Methods for Debugging a Newly Designed PCB Circuit<\/a>\u3002<\/p>\n<h2>\u8fdb\u9636\uff1a\u4e5d\u6761\u5e38\u8bc6\u7684\u901f\u67e5\u8868<\/h2>\n<p>\u539f\u6587\u7528\u300c9 \u4e2a\u5c0f\u5e38\u8bc6\u300d\u7684\u5f62\u5f0f\u628a\u68c0\u6d4b\u8981\u70b9\u4e32\u8d77\u6765\uff0c\u8986\u76d6\u4ece\u6d4b\u8bd5\u524d\u7684\u51c6\u5907\u3001\u6d4b\u91cf\u624b\u6cd5\u5230\u710a\u63a5\u4e0e\u5224\u635f\u3002\u6309\u6267\u884c\u987a\u5e8f\u91cd\u6392\u540e\uff0c\u53ef\u4ee5\u5728\u6bcf\u6b21\u4e0a\u7535\u524d\u5feb\u901f\u6838\u5bf9\u4e00\u904d\uff0c\u907f\u514d\u9057\u6f0f\u90a3\u4e9b\u4e00\u65e6\u51fa\u9519\u5c31\u4f1a\u6269\u5927\u6545\u969c\u8303\u56f4\u7684\u6761\u76ee\u3002<\/p>\n<div class=\"jp-tw\">\n<table>\n<thead>\n<tr>\n<th>\u987a\u5e8f<\/th>\n<th>\u539f\u6587\u6761\u76ee<\/th>\n<th>\u5173\u952e\u52a8\u4f5c<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>1<\/td>\n<td>\u7535\u89c6\u3001\u97f3\u54cd\u7b49\u8bbe\u5907\u7684\u6d4b\u8bd5\u6ce8\u610f\u4e8b\u9879<\/td>\n<td>\u786e\u8ba4\u5e95\u677f\u662f\u5426\u5e26\u7535<\/td>\n<\/tr>\n<tr>\n<td>2<\/td>\n<td>\u70d9\u94c1\u7684\u7edd\u7f18\u6027\u80fd<\/td>\n<td>\u5916\u58f3\u63a5\u5730\uff0cMOS \u7535\u8def\u7528 6~8V \u4f4e\u538b\u70d9\u94c1<\/td>\n<\/tr>\n<tr>\n<td>3<\/td>\n<td>\u4e86\u89e3\u96c6\u6210\u7535\u8def\u5de5\u4f5c\u539f\u7406<\/td>\n<td>\u638c\u63e1\u5f15\u811a\u6b63\u5e38\u7535\u538b\u4e0e\u6ce2\u5f62<\/td>\n<\/tr>\n<tr>\n<td>4<\/td>\n<td>\u907f\u514d\u5f15\u811a\u95f4\u77ed\u8def<\/td>\n<td>\u5728\u5916\u56f4\u5370\u5237\u7535\u8def\u4e0a\u6d4b\u91cf<\/td>\n<\/tr>\n<tr>\n<td>5<\/td>\n<td>\u6ce8\u610f\u6d4b\u8bd5\u4eea\u8868\u7684\u5185\u963b<\/td>\n<td>\u4e07\u7528\u8868\u5185\u963b\u5927\u4e8e 20K\u03a9\/V<\/td>\n<\/tr>\n<tr>\n<td>6<\/td>\n<td>\u786e\u4fdd\u529f\u7387\u96c6\u6210\u7535\u8def\u6563\u70ed<\/td>\n<td>\u5927\u529f\u7387\u72b6\u6001\u5fc5\u987b\u88c5\u6563\u70ed\u5668<\/td>\n<\/tr>\n<tr>\n<td>7<\/td>\n<td>\u5408\u7406\u5904\u7406\u5f15\u7ebf<\/td>\n<td>\u5c0f\u578b\u5143\u5668\u4ef6\uff0c\u6ce8\u610f\u63a5\u5730\u7aef<\/td>\n<\/tr>\n<tr>\n<td>8<\/td>\n<td>\u786e\u4fdd\u710a\u63a5\u8d28\u91cf<\/td>\n<td>\u710a\u63a5\u4e0d\u8d85\u8fc7 3 \u79d2\uff0c\u70d9\u94c1\u7ea6 25W<\/td>\n<\/tr>\n<tr>\n<td>9<\/td>\n<td>\u4e0d\u8f7b\u6613\u5224\u65ad\u96c6\u6210\u7535\u8def\u635f\u574f<\/td>\n<td>\u76f4\u63a5\u8026\u5408\u4f1a\u5bfc\u81f4\u591a\u5904\u7535\u538b\u53d8\u5316<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<ul>\n<li><strong>\u524d\u4e24\u6761\u9632\u7684\u662f\u5b89\u5168\u4e8b\u6545<\/strong>\uff1a\u5e26\u7535\u5e95\u677f\u4e0e\u5e26\u7535\u70d9\u94c1\uff1b<\/li>\n<li><strong>\u4e2d\u95f4\u4e09\u6761\u9632\u7684\u662f\u6d4b\u91cf\u8bef\u5dee<\/strong>\uff1a\u77ed\u8def\u3001\u5185\u963b\u3001\u6563\u70ed\uff1b<\/li>\n<li><strong>\u7b2c\u4e03\u4e0e\u7b2c\u516b\u6761\u9632\u7684\u662f\u5de5\u827a\u7f3a\u9677<\/strong>\uff1a\u5bc4\u751f\u8026\u5408\u4e0e\u865a\u710a\uff1b<\/li>\n<li><strong>\u7b2c\u4e5d\u6761\u9632\u7684\u662f\u8bef\u5224<\/strong>\uff1a\u539f\u6587\u660e\u786e\u300c\u4e0d\u8981\u8f7b\u6613\u4e0b\u7ed3\u8bba\u300d\uff1b<\/li>\n<li><strong>\u5168\u6587\u6700\u786c\u7684\u4e09\u4e2a\u6570\u503c<\/strong>\uff1a20K\u03a9\/V\u30013 \u79d2\u300125W\u3002<\/li>\n<\/ul>\n<ol>\n<li>\u786e\u8ba4\u5e95\u677f\u4e0e\u70d9\u94c1\u72b6\u6001\uff1b<\/li>\n<li>\u67e5\u9605\u5f85\u68c0 IC \u7684\u539f\u7406\u4e0e\u5f15\u811a\u53c2\u6570\uff1b<\/li>\n<li>\u9009\u597d\u4eea\u8868\u5e76\u6838\u5bf9\u5185\u963b\uff1b<\/li>\n<li>\u68c0\u67e5\u529f\u7387 IC \u6563\u70ed\u5668\uff1b<\/li>\n<li>\u6309 3 \u79d2\u4e0e 25W \u5b8c\u6210\u710a\u63a5\uff1b<\/li>\n<li>\u710a\u540e\u7528\u6b27\u59c6\u8868\u67e5\u77ed\u8def\u518d\u901a\u7535\u3002<\/li>\n<\/ol>\n<p><img loading=\"lazy\" decoding=\"async\" width=\"1080\" height=\"607\" class=\"alignnone size-large wp-image-8888\" src=\"https:\/\/www.jingpengpcb.com\/wp-content\/uploads\/2023\/08\/reasons-and-troubleshooting-methods-for-tin-defects-on-pcb.jpg\" alt=\"Causes of Poor Soldering on PCBs and Troubleshooting Methods\" srcset=\"https:\/\/www.jingpengpcb.com\/wp-content\/uploads\/2023\/08\/reasons-and-troubleshooting-methods-for-tin-defects-on-pcb.jpg 1080w, https:\/\/www.jingpengpcb.com\/wp-content\/uploads\/2023\/08\/reasons-and-troubleshooting-methods-for-tin-defects-on-pcb-300x169.jpg 300w, https:\/\/www.jingpengpcb.com\/wp-content\/uploads\/2023\/08\/reasons-and-troubleshooting-methods-for-tin-defects-on-pcb-1024x576.jpg 1024w, https:\/\/www.jingpengpcb.com\/wp-content\/uploads\/2023\/08\/reasons-and-troubleshooting-methods-for-tin-defects-on-pcb-768x432.jpg 768w\" sizes=\"auto, (max-width: 1080px) 100vw, 1080px\" \/><\/p>\n<p><img loading=\"lazy\" decoding=\"async\" width=\"1280\" height=\"720\" class=\"alignnone size-large wp-image-6786\" src=\"https:\/\/www.jingpengpcb.com\/wp-content\/uploads\/2023\/08\/smt-processing-quality-and-appearance-inspection.jpg\" alt=\"SMT Manufacturing Quality and Visual Inspection\" srcset=\"https:\/\/www.jingpengpcb.com\/wp-content\/uploads\/2023\/08\/smt-processing-quality-and-appearance-inspection.jpg 1280w, https:\/\/www.jingpengpcb.com\/wp-content\/uploads\/2023\/08\/smt-processing-quality-and-appearance-inspection-300x169.jpg 300w, https:\/\/www.jingpengpcb.com\/wp-content\/uploads\/2023\/08\/smt-processing-quality-and-appearance-inspection-1024x576.jpg 1024w, https:\/\/www.jingpengpcb.com\/wp-content\/uploads\/2023\/08\/smt-processing-quality-and-appearance-inspection-768x432.jpg 768w\" sizes=\"auto, (max-width: 1280px) 100vw, 1280px\" \/><\/p>\n<p>\u5e38\u89c1\u8bbe\u8ba1\u9519\u8bef\u89c1<a href=\"\/en\/blog\/common-errors-in-printed-circuit-board-design\/\">How to Avoid Common Mistakes in Printed Circuit Board Design<\/a>\uff1b\u7535\u8def\u677f\u52a0\u5de5\u89c1<a href=\"\/en\/pcb-factory\/\">\u7535\u8def\u677f\u52a0\u5de5<\/a>\u3002<\/p>\n<hr \/>\n<h2>Frequently Asked Questions<\/h2>\n<h3>1. \u5982\u4f55\u907f\u514d\u5728\u6d4b\u8bd5PCB\u677f\u65f6\u5f15\u8d77\u77ed\u8def\uff1f<\/h3>\n<p>\u5728\u6d4b\u8bd5PCB\u677f\u65f6\uff0c\u4f7f\u7528\u4e07\u7528\u8868\u6216\u793a\u6ce2\u5668\u65f6\u8981\u5c0f\u5fc3\uff0c\u786e\u4fdd\u4e0d\u4f1a\u56e0\u4e3a\u8868\u7b14\u6216\u63a2\u5934\u7684\u6ed1\u52a8\u800c\u5f15\u8d77\u96c6\u6210\u7535\u8def\u5f15\u811a\u95f4\u7684\u77ed\u8def\u3002\u6700\u597d\u5728\u5916\u56f4\u5370\u5237\u7535\u8def\u4e0a\u8fdb\u884c\u6d4b\u91cf\u3002<\/p>\n<h3>2. \u5982\u4f55\u786e\u4fdd\u710a\u63a5\u8d28\u91cf\uff1f<\/h3>\n<p>\u5728\u710a\u63a5\u8fc7\u7a0b\u4e2d\uff0c\u786e\u4fdd\u710a\u63a5\u7262\u56fa\uff0c\u907f\u514d\u710a\u9521\u7684\u5806\u79ef\u548c\u6c14\u5b54\uff0c\u4ee5\u9632\u865a\u710a\u3002\u4f7f\u7528\u5408\u9002\u529f\u7387\u7684\u70d9\u94c1\uff0c\u710a\u63a5\u65f6\u95f4\u4e0d\u5e94\u8d85\u8fc73\u79d2\u949f\u3002<\/p>\n<h3>3. \u5982\u4f55\u5224\u65ad\u96c6\u6210\u7535\u8def\u662f\u5426\u635f\u574f\uff1f<\/h3>\n<p>\u4e0d\u8981\u8f7b\u6613\u5224\u65ad\u96c6\u6210\u7535\u8def\u5df2\u635f\u574f\uff0c\u56e0\u4e3a\u7535\u8def\u4e2d\u7684\u591a\u4e2a\u56e0\u7d20\u53ef\u80fd\u5bfc\u81f4\u7535\u538b\u53d8\u5316\u3002\u4ed4\u7ec6\u5206\u6790\u7535\u8def\uff0c\u591a\u89d2\u5ea6\u8003\u8651\u53ef\u80fd\u7684\u95ee\u9898\u3002<\/p>\n<h3>4. \u5982\u4f55\u5bfb\u627e\u6545\u969c\u7684\u65b9\u6cd5\uff1f<\/h3>\n<p>\u5bfb\u627e\u6545\u969c\u53ef\u4ee5\u91c7\u7528\u6d4b\u91cf\u7535\u538b\u6cd5\u3001\u4fe1\u53f7\u6ce8\u5165\u6cd5\uff0c\u4ee5\u53ca\u89c2\u5bdf\u3001\u542c\u89c9\u3001\u55c5\u89c9\u548c\u89e6\u89c9\u7b49\u65b9\u6cd5\u3002\u9010\u6b65\u6392\u67e5\u53ef\u4ee5\u5e2e\u52a9\u786e\u5b9a\u6545\u969c\u70b9\u3002<\/p>\n<h3>5. \u4e3a\u4ec0\u4e48\u9700\u8981\u9010\u6b65\u5b89\u88c5\u6a21\u5757\u8fdb\u884c\u8c03\u8bd5\uff1f<\/h3>\n<p>\u9010\u6b65\u5b89\u88c5\u6a21\u5757\u6709\u52a9\u4e8e\u786e\u5b9a\u6545\u969c\u8303\u56f4\uff0c\u907f\u514d\u5728\u6574\u4e2a\u7535\u8def\u677f\u4e0a\u540c\u65f6\u51fa\u73b0\u95ee\u9898\u65f6\u96be\u4ee5\u6392\u67e5\u3002\u8fd9\u79cd\u65b9\u6cd5\u6709\u52a9\u4e8e\u66f4\u7cfb\u7edf\u5730\u89e3\u51b3\u95ee\u9898\u3002<\/p>\n<h3>6. \u6d4b\u8bd5\u5e26\u7535\u7684\u7535\u89c6\u3001\u97f3\u54cd\u8bbe\u5907\u65f6\u8981\u6ce8\u610f\u4ec0\u4e48\uff1f<\/h3>\n<p>\u539f\u6587\u6307\u51fa\u7edd\u5bf9\u4e0d\u80fd\u4f7f\u7528\u5df2\u63a5\u5730\u7684\u6d4b\u8bd5\u8bbe\u5907\u63a5\u89e6\u5e26\u7535\u7684\u7535\u89c6\u3001\u97f3\u54cd\u6216\u5f55\u50cf\u8bbe\u5907\uff0c\u5c24\u5176\u662f\u5728\u5904\u7406\u8f93\u51fa\u529f\u7387\u8f83\u5927\u6216\u7535\u6e90\u6027\u8d28\u4e0d\u660e\u786e\u7684\u8bbe\u5907\u65f6\uff0c\u52a1\u5fc5\u786e\u8ba4\u8bbe\u5907\u5e95\u677f\u662f\u5426\u5e26\u7535\uff0c\u5426\u5219\u53ef\u80fd\u5bfc\u81f4\u7535\u6e90\u77ed\u8def\u5e76\u6269\u5927\u6545\u969c\u8303\u56f4\u3002<\/p>\n<h3>7. \u6d4b\u91cf\u96c6\u6210\u7535\u8def\u5f15\u811a\u76f4\u6d41\u7535\u538b\u65f6\u8981\u7528\u4ec0\u4e48\u8868\uff1f<\/h3>\n<p>\u539f\u6587\u8981\u6c42\u9009\u62e9\u5185\u963b\u5927\u4e8e 20K\u03a9\/V \u7684\u4e07\u7528\u8868\uff0c\u4ee5\u51cf\u5c0f\u6d4b\u91cf\u8bef\u5dee\u7684\u53ef\u80fd\u6027\u3002<\/p>\n<h3>8. \u65b0\u677f\u8c03\u8bd5\u65f6\u7535\u6e90\u90e8\u5206\u5e94\u8be5\u600e\u4e48\u4e0a\u7535\uff1f<\/h3>\n<p>\u539f\u6587\u5efa\u8bae\u5148\u5b89\u88c5\u7535\u6e90\u90e8\u5206\u5e76\u6d4b\u8bd5\u8f93\u51fa\u7535\u538b\u662f\u5426\u6b63\u5e38\uff0c\u4e0a\u7535\u65f6\u4f7f\u7528\u5e26\u6709\u9650\u6d41\u4fdd\u62a4\u529f\u80fd\u7684\u53ef\u8c03\u7a33\u538b\u7535\u6e90\uff0c\u9010\u6b65\u8c03\u6574\u7535\u538b\u5e76\u540c\u65f6\u76d1\u6d4b\u8f93\u5165\u7535\u6d41\u3001\u8f93\u5165\u7535\u538b\u548c\u8f93\u51fa\u7535\u538b\u3002<\/p>\n<p><strong>Related Reading<\/strong>\uff1a<a href=\"\/en\/blog\/debugging-pcb-circuits\/\">Methods for Debugging a Newly Designed PCB Circuit<\/a> \u00b7 <a href=\"\/en\/blog\/common-errors-in-printed-circuit-board-design\/\">How to Avoid Common Mistakes in Printed Circuit Board Design<\/a><\/p>","protected":false},"excerpt":{"rendered":"<p>\u7535\u8def\u677f\uff08PCB\uff09\u5728\u73b0\u4ee3\u7535\u5b50\u8bbe\u5907\u4e2d\u626e\u6f14\u7740\u81f3\u5173\u91cd\u8981\u7684\u89d2\u8272\u3002\u4e3a\u4e86\u786e\u4fdd\u4ea7\u54c1\u7684\u8d28\u91cf\u548c\u6027\u80fd\uff0c\u68c0\u6d4bPCB\u677f\u65f6\u9700\u8981\u6ce8\u610f\u4e00\u4e9b\u7ec6\u8282 [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":8859,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"slim_seo":{"title":"What Are the 9 Key Points to Keep in Mind When Testing Circuit Boards? Live Substrates, Soldering Irons, and IC Principles","description":"What are some basic principles of circuit board inspection? This article outlines nine key points to keep in mind, including avoiding contact with live circuit boards, ensuring the soldering iron\u2019s insulation is in good condition, and understanding the principles of integrated circuits. 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