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Faulty sterio continually blows fuse above mains connection

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The fuse is usually right, and preventing a fire and worse. If you connected your speakers reasonably (do check it; perhaps someone else has issues with your tastes and rewired them) and it draws more than 5W when run quiet (try a Watt-Mizer or such unit to check it) then either it was made very badly or the dust in your house is made of metals (you would know!)
You could test it with the speakers disconnected and volume down to test that first, if you like. Connect one and see how that goes, then the other. It's certainly possible they wired a speaker sloppily inside, and/or advised you to stick wires in too far, but it would make little sound (due to the short).... Sound is very low-power and doesn't take 2000W unless you want to emulate a 50x scale cello or 1/1000 scale jet.

Posted on Feb 23, 2008

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6_30_2012_11_50_51_pm.jpg

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Generally speaking, an amp attempts to protect itself from heat, shorts, overloads and operator exuberance by refusing to turn on or stay on.

Overloads can be from excessive periods of high output or marginally low impedance loading by the speakers; and shorts would be wiring issues or a speaker blowing up.

You should be able to feel if it's hot. WHY is it overheating? Make sure it has sufficient ventilation on all sides and that vent holes are not blocked by dust balls. Ensure the fan (if equipped) is running as designed (some only operate on demand). Clean dust and debris from it.

If the amp comes back on after cooling, you're lucky. They only have so many self-protection cycles in their lives so continuously resetting or cycling their power without addressing the cause can do more harm than good.

If it protects immediately on a cool power up you should disconnect the speaker connections and try it 'nekkid'. If it comes up then diagnose which lead(s) are shorted. If it does not come up the problem is internal and should be left to an experienced and competent hands-on tech.

Check for loose speaker connections at the speaker as another possible root cause for intermittent shutdown.

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1 Answer

MY SONY STERIO KEEPS FLASHING PROTECTED ALL THE TIME AND WONT SHUT OFF UNLESS I PLUG IT OUT. PLEASE TELL ME HOW I CAN GET IT TO WORK. THANK YOU JOHN


Generally speaking, an amp attempts to protect itself from heat, shorts, overloads and operator exuberance by refusing to turn on or stay on.

Overloads can be from excessive periods of high output or marginally low impedance loading by the speakers; and shorts would be wiring issues or a speaker blowing up.

You should be able to feel if it's hot. WHY is it overheating? Make sure it has sufficient ventilation on all sides and that vent holes are not blocked by dust balls. Ensure the fan (if equipped) is running as designed (some only operate on demand). Clean dust and debris from it.

If the amp comes back on after cooling, you're lucky. They only have so many self-protection cycles in their lives so continuously resetting or cycling their power without addressing the cause can do more harm than good.

If it protects immediately on a cool power up you should disconnect the speaker connections and try it 'naked'. If it comes up then diagnose which lead(s) are shorted. If it does not come up the problem is internal and should be left to an experienced and competent hands-on tech.

Check for loose speaker connections at the speaker as another possible root cause for intermittent shutdown.

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I suspect one of the finals is blown 2SD2560 or 2SB1647. Open the case and with the power unplugged replace the fuse, next unplug the 4pin connector from the amplifier board 3 black wires and one red.
now plug in the RXD-A53 and turn it on. you should now have the display working and no clicking.
unplug it from the wall and reconnect the 4 pin connector and now plug it back in and turn it on if the fuse blows again take it to a qualified service technician, the above noted output transistors will run you about 6 bucks a piece they are 4 of them 2 of each for each channel plus labor.

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