User:Rob Kam/sandbox1/Electronic circuit fault finding
If you have built a kit and found it does not work first time please don't despair. Getting a dead board working is a very rewarding experience. Not only do you get the satisfaction of it working but you will actually learn a good deal more about electronics on the way.
Normally some basic fault finding efforts will help locate the problem but where do you start? Right here is the answer!
Fault finding can be quick and easy or a case of time, effort and perseverance. It may (and will) be frustrating at times but it really is one of the best teachers, providing you with a greater knowledge and understanding of electronics. The sense of satisfaction of finally cracking the problem can be immense.
By adopting a systematic approach to fault finding you will eventually discover where the problem lies.
Basic fault finding
Here are some simple fault finding techniques that you can try. We suggest that you thoroughly recheck the circuit again using the sequence detailed below.
- Check that all components are in the correct position and orientation.
- Check that there are no short circuits (excessively high current drain on the power supply may indicate shorts). Examine the PCB for solder splashes across pads/tracks and stray component leads/wires.
- Carry out some basic electrical tests to ensure power is reaching all parts of the circuit.
- Check all components are functioning correctly. Has overheating during soldering damaged any components? IC's and transistors are particularly susceptible.
- Remove and test suspect components using appropriate test equipment. Alternatively, substitute dubious components with tried and tested ones.
- Make a thorough check of circuit voltages/currents/signals using appropriate test equipment.
- Where kits are connected to other equipment check for compatibility problems by testing on alternative equipment.
References
- ^ Electronic Kit Basic Fault Finding Guide, Quasar Electronics Limited
Further reading
- Troubleshooting by Bernie Hutchins, Musical Engineer's Handbook, 1975, Chapter 8C
- Troubleshooting Analog Circuits by Robert A. Pease, Newnes, 1991, ISBN 0750694998
- How to Diagnose and Fix Everything Electronic by Michael Geier, McGraw Hill, 2015, ISBN 9780071848299
- Practical Electronic Fault Finding and Troubleshooting by Robin Pain, Newnes, 1996, ISBN 0750624612
- How to Test Almost Everything Electronic by Delton Horn, McGraw Hill, 1993, ISBN 0830641270
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