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Link for the service manual: http://elektrotanya.com/pioneer_vsx-305_405.pdf/download.html On page 50 of the manual (36 of the pdf) it says for the "Sub woofer pre-out jack (Not available on the VSX-305 model) If you want to boost the low frequencies, connect to a subwoofer power amplifier" Your model will not drive a sub-woofer with out another amp. His sub may be a powered sub?
Based from your comments, a new steam shower that blows the fuse in five minutes. You could have installed a new steam shower that is much bigger than what you previously have. 1. For a 5000 watts steam shower at 220 volts power must have a fuse rating of 40 amps, supply wires of at least No. 6 AWG Type THW ; and at 110 volts a fuse rating of 80Amps, supply wires of at least No. 2 AWG type THW. 2. For a 4000 watts at 220 volts, Fuse: 30 amps, Supply wire: No. 10 AWG type THW. At 110volts 60 amps, Supply wires : No. 4 AWG Type THW 3. For a 3000 watts at 220 volts, Fuse: 20 amps Supply wire: No. 10 AWG type THW; At 110volts Fuse: 40 amps, Supply wire: No. 6 AWG THW 4. For a 2000 watts at 220 volts, Fuse: 15 amps Supply wire: No. 10 AWG THW and at 110 volts Fuse: 30 amps, Supply wire: No, 8 AWG THW
You might get lucky and it be only the fuse. Since it doesn't have a reset switch, you'll have to remove the cover. Un-plug it first, remove the screws, remove the cover and taking it outside, blow off any of the dust that has fallen into the amp.
You should be able to locate a fuse near the point where the power cord enters the back. Carefully remove, check it (a thin continuous wire from end to end) and replace with an exact match for size and capacity (if it's 5A, don't replace it with a 10A) if it's burnt.
You should be able to power it up without having to reconnect everything to test if that worked. If not, a repair shop is in your future, or a new receiver.
If the fuse is in the mains (power line) you could have a bad rectifier or other problem in the power supply. Most amplifiers nowadays have switching power supplies and they are not as easy to troubleshoot as the older linear supplies. If an Output or driver transistor is shorted, the power supply fuse will dump just as fast, load or no load.
oh noh!!! I suggest you should an AVR (automatic voltage regulator), these will help to control the flactuations of power. try also check the power supply (its either 110 or 220 volts), just make sure it is compatible to your default power supply.
yea take your tv to a tech tv has a problem in the power supply there is 10mf cap in the power supply that likes to go bad replace it if that model does not have it check regulator and the microchip.however your problem lies in the powerand related circuit.good luck