Question about Harman Kardon HK 3370 Receiver

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Blown Fuse Every time I turn on the receiver, it blows a fuse. The fuse is towards the rear of the unit. It is a 5amp 125volt. Soon as I hit the power button the fuse blows. Any suggestions?

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  • Anonymous Apr 27, 2008

    Every time I turn on the receiver the fuse blows. It's a 5A 125V. This just happen all of a sudden.

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It's drawing too much power. Maybe a short in an amp. Do you have any warranty left? Double check to make sure you have the right fuse. You might also try a slow blow fuse so  you can turn it off right away as soon as the fuse starts to glow to help in diagnosing. 

Posted on Apr 23, 2008

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I have a pro-sound 1000 which keeps blowing plug fuses Can you let me know what fuse should be in the plug as this maybe the problem


The fuse in the power plug is there to protect the cable. The fuse in the plug should be the same as the cable. For instance a 5amp cable should have a 5amp fuse. If the fuse blows all the time the cable could be faulty or there could be an overload in the power supply (perhaps the transformer has failed) that is causing the supply to draw more amps than the cable and fuse can cope with.
WARNING fitting a fuse higher than the cable rating could cause the cable to overheat and catch fire!

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I have a Sony STR DB930. Something happend and it


The fuse blowing is a symptom of something seriously shorted internally. What preceded the initial problem? Smoke is bad. Fire would be soon to follow without the fuse blowing. Take it to a tech.

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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

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Power


1. Make sure the AC outlet is good.
2. Make sure there is no damage to the AC line cord.

3. Look to see if there is a fuse at the rear of the unit. It's usually located inside a black circular housing with a screw off cap that says "fuse".

If not, unplug the unit and remove the outside cover. Look for a blown fuse on the motherboard or power supply. Replace it with the EXACT value of the original fuse. You can purchase a new fuse at Radio Shack or hardware store or auto parts4.gif store. Try powering up the unit again and see if it works now or whether the fuse blows again. If it blows again, the power supply may have been damaged.
Please let me know if I can be of further assistance to you.

Good luck!

- Jim

Mar 19, 2008 | Onkyo TX-SR601 Receiver

1 Answer

Reciever


Did you try unplugging the unit and taking the cover off and seeing if the internal fuse is blown? There maybe a fuseholder on the rear of the receiver too. It is usually black, 1/2" in diameter, with a twist off cap and the marking of the fuse rating in white. If not, you'll have to take the cover off and look for a blown internal fuse. If the fuse isn't blown, you could have a faulty on/off switch or power supply. If you replace the fuse and it blows again, then something has failed and is drawing too much current and causing the fuse to blow. It could be a bad power supply or a shorted audio output module. If that is the case, it will need to be taken to a shop to be serviced.

Let me know if I can be of further assistance to you.

Good luck!

- Jim

Feb 07, 2008 | Audio & Video Receivers

2 Answers

Sansui g5500 receiver keeps blowing fuse 5amp.


I cannot seem to find any useful information for so I'll just say this from personal experiences repairing amps/receivers. Unfortuneatley there is no good news for you.

The only reason a fuse would keep blowing is if a upstream component is bad or there is a short to ground on the circuit card. If g5500 is a tube set you may get lucky as tubes either open circuit or short circuit. My suggestion, if tube, would be to power up the unit after taking the cover off and notice if there are any tubes that light up at all, will be a quick look and a number of fuses.

BUT FIRST. BEFORE YOU TAKE THE COVER OFF ANY UNIT, UNPLUG FROM WALL AND LET IT SIT FOR 2 HOURS. This gives the unit time to discharge the large capacitors in the power supply. After you wait, then take cover off being very carefull. Notice where there are capacitors (look like miniature coke cans) or any other component, you really want to avoid touching anything, And talking about touchingif you touch a tube wash your hand real well or preferably wear gloves. The oil from our skin will cause the tube to bust because of the interaction.

Another thing you can do is follow the above procedure to remove the cover but don't turn on the power.Carefully remove all the tubes. The unit might "power on" but can't be used. This would indicate one of the tubes is bad. If it does shut-down immediately, shop time.

Pure new-age component only amps/receivers are a lot harder to diagnose as there is solder work involved to test the individual part. So this need to be done in a shop as well.

I would love to help but can't, I can only guide you a bit.

Good Luck!!!
Jeff

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2 Answers

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You CAN open the unit (keep in mind that even unpluged there is still voltage runing through the system, so.... dont fry) and you will notice, if the face of the unit is towards you you will see on the left hand side a power supply board, the fuse is on that board, and it is a tube fuse, 125V 8A. Most stores do not carry the 125V version anymore, but will carry a 250V. This is okay to use where the voltage is not the main purpose of the fuse.

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1 Answer

So how do you replace a fuse?


Hmm. Tricky problem. It could be the main fuse blown and the standby power suply is only working. Worts case senerio is that one of your amp is faulty and the unit is in protection mode. If the fuse is dead then you are lucky, just get the cover open, remove the power before hand, and do a little search, Most of the time it will be in a glass tube ( glass cartridge type) rated at 250VAC with a nominal of around 5 to 7 amps rated current. U can check it with DMM in a continuity mode. If fuce blown replace with the same rating and it has to be slow blow type. Cheers

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