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Seems to be quite a few threads on JL Audio subwoofers having problems. For the money one pays of these, it seems "odd". Not feeling warm and fuzzy about my 2 f113 v2's. If Dan's subwoofer is a version 2, it can't be more than a couple of years old.
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Dan you can remove the cap and check it with an ohm meter for a dead short or low resistance. If working properly the meter will show zero for an instant then steadily rise to an open reading. There is the possibility of this correct reading but the cap will break down when voltage is applied (by the circuit). I would be inclined to replace with a higher voltage cap as opposed to higher temp ratings.
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I forgot to mention the X or cross on top of the cap is a blow-off valve of sorts. If a cap overheats due to excess voltage or reversed polarity the X will open up to let off pressure avoiding an explosion. Check the caps, visually, for signs of deformation and heat. They could also be leaking.
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Tom.......Thank you for the tips. Fortunately I have had some experience trouble shooting electronics. The last item I repaired was two bad caps in a Samsung power supply on a friend's 23" monitor that would not turn on. One cap was bulging at the top and the second one was leaking at the bottom. Two new caps brought the monitor back to life.
The two caps in question for me do not show signs of bulging tops, overheating, or leaking, but JL Audio's tech told me they are paper caps that tend to dry out internally, thus lowering capacitance and raising resistance with no external signs of failure. We will find out. I have a new ESR meter arriving Friday that can test caps in or out of circuit, so this should be a big help in zeroing in on the errant caps. My new caps shipped today, so hopefully by Friday I will have an idea if my attempt to do it myself will prove successful. |
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With the issues that have come to light with the V1 models, hopefully JL Audio has made the necessary corrections to internal parts that will improve the mean time between failures of their V2 models. |
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Dan you have all the items necessary to build a capacitor in your Kitchen. Put a sheet of aluminum foil on each side of a sheet of waxed paper (keep the foil sheets from touching at the edges) and roll them up, there you have it. Electrolitic caps have some magic goop inside that augments capacitive action and over time the goop can dry up or leak out.
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