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Quit replacing the fuse... you are doing further damage in the unit.
Likely the MOSFET power transistors are shorted and probably there are several transistors and other components ahead of those that are fried.. These are NOT well protected and the failure of a single part leads to multiple failures, often accompanied by circuit board damage when fuses are replaced with problem still existing..
Unless you are skilled at electronics you need to take it to a competent shop for repair.
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Hi Robert, The problem with ceramic fuses is that you can't tell if it's blown unless you put a meter on both ends to check for continuity. You probably have a friend that has a multi-meter sitting in a drawer somewhere, or a trip to the local Radio Shack will tell you right away - as well as likely finding the correct value fuse. Replacing it with a ceramic is not as critical as matching the AMPERAGE of the fuse (the Behringer site might be helpful: http://www.behringer.com/EN/Support/Find-Answers-or-Ask-Behringer.aspx And no, the fuse didn't die on it's own, but are most prone to failure at turn on - so this time when you plugged it in after 3 years - it was time to go.
For goodness sakes do NOT replace the fuse... doing so causes more damage inside. Likely one of the power amps has shorted and may have damaged the power supply as well. Also please read my tip on Fixya regarding a HAZARD with channel A if you use 1/4 inch plugs with the speaker cables. Essentially the sleeve of the channel A plug is the hot, and not the tip. Ground the sleeve of the plug and you can blow the channel A amp. YOU WILL NEED TO TAKE THE UNIT IN FOR REPAIR... THIS IS NOT A DIY REPAIR!!!!
Often teh power supply fails because of other problems. Unless the board has flame damage the parts that are defective can be replaced... Getting some of the parts that are special can take time. Most of the components are available at many sources however. The SPS400 power supply can be repaired.
Here is link to schematic that should have the SPS400 as well as the rest of the PMH1000 on it.
Try running the amp with no speaker cables connected. If it doesn't blow the fuse you know it's either your Speakon cables or the speakers themselves that are to blame (it's usually the cables)
If it still blows then there is a more serious problem with the power section.
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