Question about Onkyo TX-SV727 Receiver

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Problem after replacing blown fuse

I replaced blown fuse on my receiver, the word protect keeps coming on ,unit looks very clean and dust free ,can,t see any bad wires or burnt circuit board , got any clues?

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  • paulfield52 Oct 01, 2008

    i lost remote am i locked out

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  • Onkyo Master
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My dear friend your audio amplifier IC are damaged and you need to replace him.

Posted on Oct 01, 2008

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1 Answer

Where are the fuses located in onkyontx-sv525- only found 1 at power in


If you pulled the cover and only see one fuse, and if it is not blown, then you need to search deeper for the problem. All replaceable fuses on the main board are viewable.

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VSX-D902S


So remove the burned out fuse, look at it carefully for the size markings, and bring it along with you when you go shopping for a replacement. But know this: a blown fuse is usually a SYMPTOM, not the PROBLEM. The fuse is there to protect the rest of the circuitry, usually the power supply, wherein the real problem lies. So, if you replace the fuse and it blows again, you've got a much bigger, more expensive problem. Be prepared to pay as much or more to a repair shop than the unit is worth. Be prepared to have a repair shop charge you at least $50 just to diagnose the bigger problem. If you are really lucky,your blown fuse is the result of a power surge (so it did its job or protection). Buy two fuses. Consider junking the unit if the second replacement fuse blows.

Jul 26, 2012 | Pioneer Audio Players & Recorders

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Fuse has not blown but unit will not turn on? yamaha htr-5840


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.

Sep 06, 2011 | Yamaha HTR-5840 Receiver

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Nad t753 av reciever, mains power off then back on think had power surge have i blown a fuse in system. amp turns on but then 2 sec later turns off . can i take the casing off to replace fuses?.... dan


Blown fuses don't self-heal. If power comes back there is no blown fuse.

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 a root cause for intermittent shutdown.

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2 Answers

My Sony STR-DG510 has quit outputting to my speakers (via stranded speaker wire). I suspect a blown fuse but no fuse is visible on the back panel. What's the secret to replacing the fuse? Thanks!


Sony strdg510 does not have fuses on the output, it uses an output relay. If you do not hear the second click about 6 sec. after powering it on, there is a problem in the output circuit. If you do hear that click, check that the speakers are on and tape 2 / tape monitor is off and that the speakers and wiring are good.

Mar 03, 2011 | Sony STR-DG510 Receiver

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Have an HK AVR510 it stopped all sound. I opend it up and found that (under 10 years of dust) that one of the 125V 2A fuses had blown. (it is the first fuse on the right looking from the front of the...


I am now having a very similar issue with an av 100 unit I have had for quite some time now. Bought replacement fuses for it the same exact size and they keep blowing as well.. one thing I notice in the original fuse is that there appears to be a resistor in the fuse case.. maybe it requires a special fuse.

Dec 19, 2010 | Harman Kardon AVR 510 Receiver

1 Answer

MPA-101 Amplifier powers on, receives source signal, the fuse is not blown inside, but no sound comes out of the amplifier. The amp is pretty new, doesn't even have dust inside the unit.


Hello, is this a Radio Shack PA amp or Jamo amp? The unit is probably in "Protect" mode. Is this a PA system or a receiver...receivers have a protection circuit that will not let the speaker relay activate if the amplifier output section is shorted and sending voltage towards the speakers...so they won't fry!!The speaker relay should activate within 3 to 5 seconds if your output section is ok.

barneyluc

Oct 13, 2008 | Audio Players & Recorders

1 Answer

Onkyo sub woofer


You will only blow fuses and resistors if there is a short of some kind you can change fuses, resistors and capacitors all you like if you don't find the short they will just keep on blowing. It maybe something as small as a bit of conductive material or fluff or dust on chip board wipe board down make sure it is clean (a clean toothbrush is perfect) and there are no signs of burns on either side of the chipboard befor you change anything. If there are burns or greenish build up clean them with some metho or water on a cloth not to damp though and make sure Burn or corrossion hasn't taken off the protective layer on the board.
Then try new fuses. Hope this helps you

Jul 25, 2008 | Onkyo TX-DS676 Receiver

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Kenwood AR 404 burning w/ open flame.


You are literally playing with fire. Obviously the unit is in dire need of service! Please, take unit in for check out by a pro/tech

Apr 27, 2008 | Audio Players & Recorders

1 Answer

Stuck in protect mode


Speakers shorted out, blew a fuse. Replace the unit or (cross your fingers and) open up the box and find the blown fuse.

Nov 23, 2007 | Sony STR-DE425 Receiver

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