Category: Electronics Troubleshooting

Here is the procedure of testing crystal oscillator, oscillator capacitor and oscillator inductor. In a previous article we had posted a circuit called universal crystal oscillator tester for testing crystal oscillator. Now we had posted simple method which is summarize in few point on How to Test Crystal Oscillator below. An oscillator with a bad crystal may not oscillate at all, may be erratic, or may not oscillate at the correct frequency. One common crystal failure mode is a broken or corroded internal connection. Or if the crystal has been dropped,…

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Power supply has a considerable role in electronic communications equipment. The power supply furnishes the voltage and current requirements for electronics circuit operation. Special high-voltage power supplies used in microwave systems and laser systems enable large power handling tubes and semiconductor circuits to operate. In this section, we are going to look at popular types of power supply circuits and some faults that can occur in them. In this section, we’ll also learn to troubleshoot a traveling wave tube amplifier. Improper operating of a TWT can nearly always be traced…

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Before continuing about troubleshooting of traveling wave tube amplifier we have some initial considerations include: To make construction of the tube RF output circuit simple, the collector and helix are grounded. The cathode will be above ground and have a negative voltage on it as shown in figure 1. The helix is delicate and helix current will be small. The collector draws nearly all the current. The helix will be protected with an over current relay that kills the power supplies. Never defeat this relay because the tube can be…

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When traveling uncharted roads, having a map can make the difference between getting lost and finding your way. A plan for troubleshooting, like a map, can help guide you to an equipment malfunction. Made up of a logical sequence of troubleshooting steps, this troubleshooting map can help the technician hunt down the defect in a piece of electronic communication equipment. By developing and using this strategy, the technician can become very proficient at locating electronic problems and repairing them. After completing this article, you should be able to Describe the…

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How to? RF Amplifier Troubleshooting BIAS SUPPLY Many RF amplifiers utilize power from the previous stage to provide dc bias. Figure 2 shows how bias for the transistor Q1 is developed. RF from the previous stage is rectified by the base-emitter junction of Q1. The current flows through R1 and the transformer to ground. The reactance of C1 is low at RF, so the RF bypasses the resistor. C1 also serves to filter the RF pulses and develop a dc voltage across R1. At the base of Q1, this dc…

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Introduction to Electronics Troubleshooting Techniques Due to the increasing complexity of electronic communications equipment, the technician must have a good understanding of communication circuits and concepts. To be an effective troubleshooter, the technician must also be able to quickly isolate faulty components and repair the defective circuit. Recognizing the way, a circuit may malfunction is a key factor to speedy repair procedures. After completing this tutorial on electronics troubleshooting techniques, you should be able to Explain general troubleshooting techniques Recognize major types of circuit failures List the four troubleshooting techniques…

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