Question about Denon AVR-600 Receiver

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AVR-600 We have a Denon AVR-600 and -protect- is showing on the unit. We follwed the instructions in user manual and checked all speaker connections for shorts, cleaned vents and unplugged it for 24 hours. Nothing has resolved the problem it still says -protect-.

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  • Chuck May 11, 2010

    i meant to say that if it doesnt say protect after you unplugged everything that you should only plug one thing in at a time and find out the culprit.

  • Chuck May 11, 2010

    unplug everything! yes everything. Just plug in the power cord and see if it still says protect. if it doesnt then plug on thing in at a time and see what is causing the protect. Could be a damaged speaker crossed rca connectioins. let me know. i will get back to you

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The problem is past that point once the protect continues to activate the amp is in need of service

Posted on Feb 26, 2009

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Posted on Jan 02, 2017

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I think you have already done the factory reset procedure shown on page 175 of the user manual.
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http://assets.denon.com/DocumentMaster/us/Owners%20Manual%20-%20English_AVR-X1000.pdf


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First of all check all the speakers. Maybe all the speakers gone out because of the loud blast. Also check in the tuner mode. Is there is any sound. If there is some problem in the avr then it will show the fault and will go into protection mode.


You can check the speakers with a battery from any one of the remote. Take the leads of each speakers and connect the lead to the battery terminals. If the speaker is ok then it will make a small cracking sound each time when you connect its wire to the battery.


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May 18, 2009 | Denon AVR-3805 Receiver

1 Answer

Protection circuit momentary activation. Not heat/speaker problem


Is it possible for you to lower the source level? if yes go ahead...

There is an automatic Dialogue normalisation function in Denon which is activated to reduce overly bright input signals. ( most movies have wide variation in sound levels and therefore this function is avaialble). (see page45 of your user manual).

When your system worked fine with the AVR 2808CI, then why is it giving problem with AVR 3808CI....???? You must ask Denon.

Protection circuits are activated when:
1). There is rise of internal temperature.
2).Core wires of the speakers are touching each other or a core wire is sticking out of the terminal and touching the set's rear panel or the speaker itself has a problem.
3). Speakers with an impedance other than specified are being used.
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4). the set is damamged or has bad solder / dry solder connection .

If your AVR is new, please do not accept, the set could be faulty. The protection circuits should not be activated unless any of the above happen.

You must know, at times the protection circuits are not fast enough and it could burn some of the transistors on the power output circuit. With time, the solders on the circuit board could give way and give you problems later on.

You must sort out with Denon if the AVR is under warranty.

Best of Luck.

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I have repaired many of these Denon receivers over the last few years.

Since the headphones work, that means if you dis-connect the speakers it will turn on and not go into protect (when power cuts off a few seconds after turning the unit on).

The most likely problem is a bad speaker. to find out which speaker is causing the problem, do this.

Start out with just one speaker connected and then turn on the unit. If it turns on and plays music, you know that speaker is good.
Now turn the unit off again and add another speaker and keep the first speaker connected. Once again, if the unit plays, that speaker is also good.

Keep doing this same procedure one speaker at a time. As soon as you connect a speaker and then try to turn on the unit and it goes into protect, the speaker you just connected is bad.

To confirm that this speaker is the bad speaker, dis-connect all speakers and only plug the suspected bad speaker into a speaker jack that worked with one of the other speakers.
If the unit still goes into protect you know then that you have found the bad speaker.

If the unit still goes into protect, that speaker is bad and you will need to take it in for repair or replace it.
make sure you use 8 ohm speakers. if i remember correctly these Denons can use 6 ohm speakers, but those are harder to find and most home speakers are 8 ohms.

If the unit does not go into protect and that suspected bad speaker plays in one of the other speaker jacks, what you really have is a bad channel in the amplifier, the channel that the suspected bad speaker was previously connected to.

If you find out you have a bad channel, you will need to take it in to an repair center. Preferably an authorized Denon service center. There are not very many of those around. I work at the only authorized Denon service center in the entire state of Michigan.

If I can be of more assistance, don't hesitate to ask. And a good rating is always appreciated. :)

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