When testing PCB boards, it is important to pay attention to details in order to ensure product quality. Here are nine tips:
1. It is crucial to avoid using grounded test equipment to touch live TV, audio, video, and other equipment on the PCB board without an isolation transformer. Directly testing these equipment without a power isolation transformer can lead to short circuits and damage to integrated circuits.
2. When testing the PCB board, be mindful of the insulation performance of the soldering iron. Ensure that the soldering iron is not charged and consider grounding the shell. It is recommended to use a low voltage circuit iron for safety.
3. Before testing the PCB board, take the time to understand the working principle of integrated circuits and related circuits. Familiarize yourself with the function, internal circuit, main parameters, and normal voltage of each pin to make analysis and testing easier.
4. Avoid causing short circuits between pins when testing the PCB board. Use caution when measuring voltage or testing waveforms to prevent damage to the integrated circuit. Pay special attention when testing flat-package CMOS integrated circuits.
5. Use a PCB board test instrument with a large internal resistance to measure DC voltage of IC pins. A multimeter with an internal resistance greater than 20KΩ/V is recommended to avoid measurement errors.
6. Pay attention to the heat dissipation of power integrated circuits when testing the PCB board. Ensure proper heat dissipation and avoid working in high-power states without a heat sink.
7. Test the lead wires of the PCB board carefully. Select small components for external replacements and ensure proper wiring to prevent parasitic coupling. Pay attention to grounding between the audio power amplifier integrated circuit and preamplifier circuit end.
8. Ensure the quality of soldering when working on the PCB board. Use a soldering iron with about 25W power and check for firm solder joints to avoid false soldering. Carefully inspect soldered integrated circuits for short circuits before powering on.
9. Do not jump to conclusions about the damage of integrated circuits easily. Multiple voltage changes in a circuit may not necessarily indicate damage to the integrated circuit. Verify the integrity of the circuit and measure voltages accurately before making assumptions about the condition of the integrated circuit.
1. It is crucial to avoid using grounded test equipment to touch live TV, audio, video, and other equipment on the PCB board without an isolation transformer. Directly testing these equipment without a power isolation transformer can lead to short circuits and damage to integrated circuits.
2. When testing the PCB board, be mindful of the insulation performance of the soldering iron. Ensure that the soldering iron is not charged and consider grounding the shell. It is recommended to use a low voltage circuit iron for safety.
3. Before testing the PCB board, take the time to understand the working principle of integrated circuits and related circuits. Familiarize yourself with the function, internal circuit, main parameters, and normal voltage of each pin to make analysis and testing easier.
4. Avoid causing short circuits between pins when testing the PCB board. Use caution when measuring voltage or testing waveforms to prevent damage to the integrated circuit. Pay special attention when testing flat-package CMOS integrated circuits.
5. Use a PCB board test instrument with a large internal resistance to measure DC voltage of IC pins. A multimeter with an internal resistance greater than 20KΩ/V is recommended to avoid measurement errors.
6. Pay attention to the heat dissipation of power integrated circuits when testing the PCB board. Ensure proper heat dissipation and avoid working in high-power states without a heat sink.
7. Test the lead wires of the PCB board carefully. Select small components for external replacements and ensure proper wiring to prevent parasitic coupling. Pay attention to grounding between the audio power amplifier integrated circuit and preamplifier circuit end.
8. Ensure the quality of soldering when working on the PCB board. Use a soldering iron with about 25W power and check for firm solder joints to avoid false soldering. Carefully inspect soldered integrated circuits for short circuits before powering on.
9. Do not jump to conclusions about the damage of integrated circuits easily. Multiple voltage changes in a circuit may not necessarily indicate damage to the integrated circuit. Verify the integrity of the circuit and measure voltages accurately before making assumptions about the condition of the integrated circuit.
