SOURCE: Subwoofer
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 fast blo 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 :)
regards
Graeme
SOURCE: AR1 Subwoofer Keeps Blowing the 5 Amp Fuse
Well, so far so good. I reinstalled the newly repaired amp and fired it up and so far, so good. Ran it through about an hour of fairly intense break-in tracks and then ran it through about 2 dozen power up and down cycles to try to get it to fail (better now than a month from now and have to fight them on backing it up).
SOURCE: Subwoofer issues
I have the Onkyo SKW-200 and the fuses are blowing also. Plug it in and the fuses blow instantly. My brother has the same sub and the same thing happened. Our subs only worked for about 1 month before they went out. Do you think it is the power supply?
SOURCE: fuse on subwoofer keeps blowing
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.
SOURCE: KLH ASW10-120B subwoofer
I realize that this is an old problem, but folks are still finding it on searches, so here goes.
Here are the two pages of schematics from KLH. I wrote to their tech department and explicitly asked for permission to share them here.
Here's the lower board, which has the power supply:
KLH ASW 10-120 subwoofer schematic - lower board
Here's the upper board:
KLH ASW 10-120 subwoofer schematic - upper board
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