If every time I put a new fuse in my surround sub and switch on the power to the sub it instantly blows the fuse with a deafening 120Hz ripple even before I press the power button on the controller, which I should have to do before any sound comes out at all, what is the easiest way to diagnose which component has fried and made a short? Is there any way to test capacitors without power running to them?
If by surround sub you mean a dedicated amplifier and a subwoofer hooked to it: 1] Test the impedence of the subwoofer; if it is shorter that may be the sole problem [or it may have fired the amp]. Compare that with the specification value 2] You can measure caps with an ohmmeter [very crubdely, though, but likely well enough; see
