Question about NAD C720BEE Receiver

2 Answers

Receiver fuse continuosly blows when replaced and powered up

I am having difficulties with my stereo receiver in which the fuse blows every time I have replaced it. I even uplug the amp in the case that this is somehow causing the overload to the fuse. I'm assuming that one of the resistors is bad or something of that nature. What do you think? Help is greatly appreciated :)

Posted by on

2 Answers

  • Level 1:

    An expert who has achieved level 1.


    An expert that hasĀ over 10 points.


    An expert whose answer gotĀ voted for 2 times.

    Problem Solver:

    An expert who has answered 5 questions.

  • Contributor
  • 16 Answers

When a fuse blows it indicates that too much current is flowing. This melts the wire in the fuse.

What is actually damaged is hard to say, remove all the cables and test. If the fuse still blows take the unit in for service.

I doubt that a resistor has died, more likely something has created a direct short. It could be a power supply issue, or an issue with the amplifiers.

Ask for a quote first if it is out of Warranty.

Posted on Apr 03, 2008

Ir's not likely to be a resistor. Sounds like a shorted component in the power supply. A diode or bridge rectifier, or possibly a transistor or Regulator IC.

Hope that helps...


Posted on Apr 03, 2008

1 Suggested Answer

  • 2 Answers

SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

a 6ya expert can help you resolve that issue over the phone in a minute or two.
best thing about this new service is that you are never placed on hold and get to talk to real repairmen in the US.
the service is completely free and covers almost anything you can think of (from cars to computers, handyman, and even drones).
click here to download the app (for users in the US for now) and get all the help you need.

Posted on Jan 02, 2017

Add Your Answer

Uploading: 0%


Complete. Click "Add" to insert your video. Add



Related Questions:

1 Answer

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

Oct 20, 2015 | Panasonic Vintage Technics Sa-202 Am/fm...

1 Answer

I hooked up more than one set of speaker wires in on set of terminals and blew the 2 8amp fuses inside. i replaced them ,but they blow right away when i turn the system on.

Hi Robert,
You've probably managed to fuse two wires together or one wire onto the casing. You need to find and rectify this before proceeding further.

Jul 16, 2015 | Sony Str-av910 Home Theater Surround...

1 Answer

Why does a fuse blow in my JVC receiver Model AX-S331?

usually a crossed speaker wire, or overdriving the amp will cause a fuse to blow

Mar 21, 2013 | JVC Audio Players & Recorders

1 Answer

How many amps is my RCA Sta 3850 am/fm stereo receiver and where would I find a fuse for it also what exactly could be making the fuse blow out?

I would like to purchase a Realistic STA-3850 AM/FM Stereo Receiver, anyone that would like to sell, please contact me at my email address: Thank you-dave

Mar 24, 2012 | RCA Audio Players & Recorders

1 Answer

Blown Stereo Receiver

If the output transistors are shorted they cause burns on the resistors and even even blow the AC fuse and your receiver will not come ON. I used to enjoy fixing, these AMPs this was many years ago. Any how, repairing this unit will be more than a $100.00 my advice to you is BUY a NEW 1.

Good luck
N Sabre

Nov 08, 2009 | Sony STR-DE535 Receiver

3 Answers

Sony str-de845 Powers up, relay clicks, fuses BLOW!

This condition, may be produced by defective components (Q506, Q507). you can remove those transistor, replace the fuses, power-on and wait for relays click. if the fuses not blown again, them replace both transistor.

Mar 05, 2009 | Sony STR-DE845 Receiver

1 Answer

Ht-r500 onkyo

When a receiver does this, it is know as the "protect mode". This keeps the receiver from causing more damage to the components in it, by shutting it off when it detects an abnormal amount of voltage or current.

If you had to replace the fuses, it is most likely that you have a blown channel in the receiver.

You put 8 amp fuses in, so I hope that the fuses that blew were 8 amps as well. If you put fuses in that are higher rated in amps than the ones that blew, you will most likely cause more damage to the unit than need be. If the fuses keep blowing, please stop putting new fuses in again until the unit is repaired. Every time a fuse blows, it is because of too much current is going thru the unit. Having too much current is a very bad thing for electronics, it causes components to short out and sometimes even catch fire if the fuse is higher rated than it is supposed to be.

To find out just what parts will need to be replaced, you need a multimeter and then you will need soldering tools to remove the bad parts and put the new ones in.

When an amplifier channel gets blown, there are normally around 5 to 10 parts that will need to be replaced. If you do not replace every single bad part in the channel that has blown, you will most times blow up all the new parts that you just put in.

If you have no experience with electronics, you really should take it in to a service center for repair. If you are willing to try it yourself, let me know and I will guide you thru the troubleshooting steps to help you identify all the faulty components.

Onkyo is very well made equipment and is worth getting fixed.

A blown channel can normally be repaired for around $100 to $150, just depending on the shops rates and the extent of the damage.

Let me know if you need more help.


Jul 26, 2008 | Onkyo HTR500 Receiver

1 Answer

Have a nearly 30-year old Akai stereo receiver AA-R30. Power light just stopped turning on. Opened up case and found main fuse between AC power cord and power transformer blown. When I replace the fuse,...

Look for shorted output transistors or possibly shorted rectifier diodes. An immediate fuse blowing up usually means that the power supply is the problem. Keep us posted.

Apr 08, 2008 | Audio Players & Recorders

1 Answer

Blows 2 120 volt 6.3 amp fuses near power supply

You have a short either from foreign object inside or blown audio amps. Look for any chard or burnt components.

Sep 13, 2007 | Pioneer VSX-454 Receiver

Not finding what you are looking for?
NAD C720BEE Receiver Logo

Related Topics:

924 people viewed this question

Ask a Question

Usually answered in minutes!

Top NAD Audio Players & Recorders Experts


Level 3 Expert

4678 Answers

The Knight
The Knight

Level 3 Expert

69718 Answers


Level 1 Expert

2 Answers

Are you a NAD Audio Player and Recorder Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides