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Electronics Repair (sci.electronics.repair) Discussion of repairing electronic equipment. Topics include requests for assistance, where to obtain servicing information and parts, techniques for diagnosis and repair, and annecdotes about success, failures and problems. |
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Potting question
I have a circuit board from a car stereo amplifier. My vehicle uses an
amp for each speaker, and this particular amp is well known for having electrolytic capacitors that go bad. I would like to replace the capacitors, but the caps in the middle of the board, and the adjacent inductors were partly covered with an amber colored transparent, slightly soft potting. I was able to remove enough of it without doing any damage (except to a couple of the capacitors I will be replacing) but I'd like to have an idea of what to replace the potting with. The amp board itself gets enclosed in a shield that acts as a heat sink for the transistors, which are not near the potting, and the entire shielded amp goes in a sealed enclosure that also contains the speaker. So it's pretty isolated from outside environmental factors, and I don't know enough about this to know what effect the potting has on thermal issues or anything else, or even why it's needed. It seemed to have been applied somewhat haphazardly, covering the inductors about half way each, and burying some of the capacitors part way, and filling some of the space between them. Is there some general explanation of why potting would typically be used here and what I should look for? |
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