The power fuse blows as soon as the unit is plugged in
Fuse blows even when power switch is in off position. Prior to the fuse blowing, the unit emitted a loud hum without the stereo unit being turned on. The unit is about a year and a half old and no previous problems.
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Re: The power fuse blows as soon as the unit is plugged...
There is a problem with the amplifier within the sub. Many of these units never completely turn off. They are often set to automatically startup when a signal is detected. This may be the case here. The loud hum as a defect in the output amp section. At this point you probably have a blown amp section. The "protection" for this is to cause a dead short that will open up the fuse. This unit will require service. It is unlikely that any service info is availabel to the general public either.
The fix could be simple, but without seeing the unit, I can not state that for sure.
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If you're replacing the fuse with the same specs and the only difference is the new one is not a "slow blow", you won't damage the speakers, but the fuse could blow again even if there is no actual fault. The slow blow is designed to accept a temporary surge of power without blowing - as in initial power up.
The transistors at the output stage of the sub amplifier circuit might be shorted so each time you power on, the circuit draws a very high amount of current which causes the fuse to blow. It's definitely a problem with the circuit so using a higher current rated fuse would probably just result in damaging the amp even more. You should ask a qualified electronics technician to take a look at it. I hope you can fix it.
Take a look at the Voltage selector switch (if one is existing). It may be switched at the wrong position. In that case, I hope that the power supply is not burned out (if it is set at the wrong position).
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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
Repeated fuse blowing generally indicates a blown power supply, or blown output stages or both. One thing to do is be sure that you have replaced the fuse with the correct type. A T stamped into the metal of the fuse near the rating, indicates sloblo or Time Lag fuse. A fastblo fuse, may work once, or more times, but will never replace a sloblo fuse in this type if unit. Good Luck, hope this info helps, don't hesitate to hit me back here for more help :)