Question about Harman Kardon HK 3480 Receiver

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Fuses blow when receiver turned on, even when the speakers are not connected.

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These means that the output stage is already blown out (maybe from pre-used short circuit speakers' cables). I suggest you to get it at a technician in order to locate and replace the blown parts.

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Posted on Sep 13, 2010

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How do I fix my yamaha receiver? I turned it up and it shut off,tried to turn on heard fuse blow. Replace one of the two fuses 10A 125v that one blew also.


Fuses blow due to an overload. What has happened in you case is one or more of the output devices (found on the big heat sink) has shorted and acting like it was a piece of wire. Now you have to find out which. By the way it might have gone due to bad speaker wires or speakers, or speaker wires touching each other.

Jan 11, 2016 | Yamaha HTR-5890 Receiver

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How can I stop my AM/FM receiver from over-loading my speakers and fuses?


do you think your receiver could be a electron tube type ? (that's old) if so your problem could be impedance .

most modern speakers are set to take an impedance of 4 ohms ,, when if your amp has tubes its set to use a 16 to 32 ohm impedance (speakers and amps impedance has to match or distortion will result ) impedance matching transformers can be used to help match load to amp
also speakers need to be rated for there use in wattage , if your speakers have only three amp fuses in them assuming there 8 ohms impedance then they are rated for a max wattage of 88 watts(peak to peak) any more and the voice coils will be damaged from overheating (putting twenty amp fuses in them are a sure way to do exactly that)

also a simple test one can do to older amps is to temp shunt the input together with a speaker connected as a load on output , then slowly increase the volume , no sound (hum / buzz) should be heard or any damage to speaker should occur , if either then there are parts inside your amp that is defective and is damaging speakers

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1 Answer

Why do I blow fuses?


Hi Pete
Are you blowing fuses in the receiver/amp or speakers? Without knowing what device you're referring to, I would guess that you have a problem with your speakers not having enough power handling capability for the amp that's driving them (which would blow your speaker fuse) OR (if you're blowing receiver/amp fuses) too many speakers wired in parallel showing your receiver/amp far less than the 8 ohms or even 4 ohms impedance that it is rated for. For example, two four-ohm speakers wired in parallel shows a 2-ohm load to the receiver/amp. Not many consumer devices have the capability to load down to 2 ohms.

Hope this helps.

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1 Answer

Harmon Kardon Receiver "Protect" Mode issue


If your receiver enters protect mode with no speakers connected, it is an indication that you will have to start troubleshooting inside.This will involve visual checking and checking with a multimeter to isolate the problem. A further issue is finding out why your JBL woofer keeps blowing fuses. It could be shorted.

Dec 12, 2013 | Audio Players & Recorders

1 Answer

AVR 3700 no sound


do headphones work with or without speakers attached? does unit light up? Check fuses. If breaker pops, or replacement fuse blows, it needs repair.

Nov 27, 2013 | Harman Kardon AVR 500 Receiver

1 Answer

System blowing fuses. Probably didn't connect it back up correctly. Need a wiring diagram or schematic.


If you refer to its manual it will show how to connect and how NOT to connect speakers. No other connection will cause fuses to blow. Disconnect the speakers as a start and see how that works out.

Jun 25, 2010 | Audio Players & Recorders

1 Answer

I have a dual XIA3145 580 watt amp that keeps blowing fuses


Generally, this indicates that there's at least one shorted output transistor.

Disconnect all speaker wires from the 'amplifier's speaker terminals' and disconnect RCA/signal cables from the amp. If it powers up normally, the speakers/wiring need to be checked. If it still blows the fuses, the amp almost certainly has shorted output transistors and will need to be repaired.

I'd recommend using two 10 amp fuses. The amp will power up with 10 amp fuses if there is no problem. If there is a problem, there's less of a chance of doing more damage by using the 10 amp fuses.

Let me know if you have any other questions.

babin_perry@yahoo.com

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3 Answers

I have a onkyo HT-R500 receiver and it keeps blowing fuses.


A receiver that recent usually has a detect circuit that keeps the outputs off until speakers are connected . So, if it bows fuses right away , it's really a power supply issue.
Probably the AC rectifier bridge.

Tech service only.

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1 Answer

Repair service for AG1000 Zapco Amp.


Is it blowing the three 30 amp on-board fuses?

To have 3 speakers bridged, each speaker must have at least a 12 ohm impedance (assuming that all speakers are connected in parallel). If you're running a load lower than 4 ohms (mono), the amp will likely fail.

The fuses don't blow right away because they are cold at first. As they heat up, they can blow more easily (even though the current draw hasn't increased).

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1 Answer

Denon receiver shutdown


Try turning down your tone controls. Like your bass, treble, or your equalizer. If you hear too much tinny or hissing sounds, the treble has to be turned down, or turn down the upper bands controls on your equalizer to the optimun level. If you hear too much bassy sounds, your bass control has to be turned down, or the lower band controls has to be turned down to the optimun level. If you are planning on turning the volume up, you may have to turn down some of the tone controls to the optimun levels, otherwise, your receiver may shutdown, or you may blow fuses in your speakers. Also make sure you speaker wire polarity is hooked up right. Red wire on the + red terminals, and the black wire on the - black terminals. Also don't have the volume turned up too high to the point where your receiver would have clipping or distortion, or else your receiver may shutdown, or you may blow fuses in your speakers.

If this don't help, then there may be something wrong with your receiver or your speaker.

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