Fuse blows each time its replaced...havenot taken it apart yet to see if anything melted or burnt.... is there any service or repair manual or someone with knowledge on this.. any response will be greatly appreciated.
Sounds like your fuse is rated too low, try a heavier fuse or search Retrevo Manuals.com and you may find a manual.
SOURCE: Polk Audio PSW10 electrical board smoking
I should just replace the parts that were burning, it will cost a lot less.
SOURCE: Polk Audio PSW202 subwoofer.
Fuse probably went bad because either the large filer capacitors at the edge of the PCB went bad and or the final output IC mounted on the heatsink(15 pin) fried. Check the capacitors and all the semiconductor components on the board for burn marks or corrosion. You have to remove the heat sink clamp from in front of the output IC to adequately visualize its condition. In fact you might have to remove the large aluminum heatsink attached to the chassis to get a good view of the IC. If it or the heat sink clamp show signs of thermal burns you need to replace it. The IC is a TS TDA7294 mono audio amp available at Mouser Electronics. Replace the 35V 4700mF caps with 50V 4700mF caps. You will only have enough space on the top of the PCB for one of the larger caps. I mounted the other on the circuit side of the board. Note the polarity of the original caps and respect it in their replacements. The fuse is a 5 X 20 medium speed slow blow 250V 2.0A glass fuse.
537 views
Usually answered in minutes!
×