I forgot to turn off power to the unit when I disconnected the right rear speaker. Unfortunately the two speaker wires touched and blew the fuse. Changed the fuse but it blows when power turned on. How can I trouble shoot and repair?
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Fuses blow when there is an overload. Unfortunately this saving action doesn't always save everything. If you fixed the part that was causing the fuse to blow, then that would stop that. It would not however correct anything that got damaged before the fuse lost it's life. Volume control these days is done by an IC. Sometimes these are static sensitive, and easily go out in fault conditions or maybe if you went near it without being grounded, when repairing the unit?
My first guess is the filter capacitors in the output stage of your amplifier are history/worn out.Try a different amp to confirm.Otherwise disconnect the speaker wires and check that the impedance/ohms value is at or near the stated value,4 or 8 ohms.This measurement can be made with a cheap ten dollar VOM "volt/ohm/meter."
if a fuse does not blow when a short is present then the wire or unit will catch fire. You have a dead short most likley in the subwoofer. If you unplug the subwoofer and the fuse does not blow then your unit failed.
Depending on the wattage of the amp to the wattage off the speakers depends on what to use and how to control them..If your speakers are rated for more power than the amp can produce it will blow the fuses just as if the amp is rated for more than the speakers it will blow the fuse..Those type of speakers do need a good supply of power to run and speaker wire size could play an important part of that.If wire supply is to small it will over heat the coil in speakers and also blow the fuse...Look in side of the boxes to see what kind of capacitors they have on the speakers or there size to insure correct for speakers them selves..Also look at all of the wire routling in the amp to insure proper installation..Hope this helps you..Have a great day
Subwoofers draw a tremendous amount of power. With the amount of heat generated by amperage flow and the movement of the voice coil, you may have burned out the coil. Do a resistance check across the coil. Easy check? Temporarily attach another speaker to replace that one. Use LOW VOLUME and slowly work the vol up,and, if the fuse does not blow, it's the other speaker.
possible solution - this can be caused by a fault in the receiver unit. the sub has a triac 'high side switch' circuit that can cause the fuse to blow if it doesn't get a good switching signal e.g. if the receiver power supply is not running at the full voltage. check the plug pack wire for damage, check the 12v input area on the receiver board for dry joints, particularly the power input socket. hope this helps.-pj
I had the same problem. The screws around the perimeter of the back plate must be unscrewed and the plate must be pried off as it is glued to the box. When replacing my fuse, 2A 5x20 GMA, it blew the fuse again. Disconnecting the second circuit board prevented the next fuse from blowing, but now the question is what is wrong with the circuit board? I cannot see any damage or shorts.