I have a Pioneer VSX-3800 Receiver and for some reason one day it wouldn't power on. I removed lid, and noticed one of the fuses was blown. I replaced the 1.25 fuse, plugged it in and it blew the replacement fuse. This unit has sentimental value and I do not want to replace it or get rid of it.
SOURCE: JVC RX-318 keeps blowing fuses
could be several things, speaker wires touching,shorted output transistors, a shorted rectifier diode,bad filter caps in the power supply,those are the most common
SOURCE: sony str-de845 Powers up, relay clicks, fuses BLOW!
This condition, may be produced by defective components (Q506, Q507). you can remove those transistor, replace the fuses, power-on and wait for relays click. if the fuses not blown again, them replace both transistor.
SOURCE: I have a Pioneer VSX-454 reciever, both 1.25 Amp fuses blown
blue two legged varacter on power supply board needs to be replaced
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