Question about Denon AVR-2105 Receiver

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Over heated after the unit had been on all day, i noticed that somebody put some books and papers ontop of it ( covering the cooling vents ). i could smell something burning. now when i turn it on the stand by button/lightflashes 5-6 times then clicks and just flashes red. please advise.

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  • davezilla Jun 10, 2008

    no warranty. i was expecting to simply replace a part.

  • davezilla Jun 10, 2008

    would there be a logical place to start? assuming that it did overheat, would this be obviuos by just looking at it?


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The manual warns not to put books on it, do you have warranty?
It might not be covered by the warranty.

Posted on Jun 10, 2008


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Is this unit still under warranty?

Posted on Jun 10, 2008

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1 Answer


Most of these devices have an internal cooling fan and/or heat sink that removes the excess heat from the circuitry; some have both. If the fan is not working or the heat sink clogged or has come dislodged from the power device(s), it can cause an overheat rapidly.

Feb 01, 2016 | Onkyo TX-SR607 Receiver

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Kenwood VR 605 power light flashes


Dec 10, 2013 | Kenwood VR-605 Receiver

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Unpluged unit and left for 30 days vacation. When I returned plugged unit in and stayed on for a few minutes then shutdown. Now unit comes on but goes into stanby after a few seconds. What is the problem?

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 RX-V2400 Receiver

1 Answer

Yamaha ysp 900 will not turn on,occasionly will come on if power socket is switched on and off rapidly,it will then just stop working randomly..

There are several reasons that can cause the power transformer to fail. The most common reason in Yamaha's experiences is overheating. When a transformer gets too hot, a heat sensitive device called a "thermal fuse" opens up. This renders the transformer useless and it must be replaced. All Yamaha products sold by our authorized dealers carry an Underwriters Laboratory or CSA Certification. This UL listing assures you that the product is completely safe to use when operated in accordance with your owner's manual. And should there ever be a failure within your unit, it will not shock you or catch fire or present any hazards to life or property. The thermal link in your transformer is a requirement to obtain the UL or CSA listing. This thermal link opens up instead of having your transformer catch fire or cause potential electrical hazards. Your amplifier should not have anything placed on the top of it, covering the vents. These vents need to be left open as that is how the unit cools itself. If your amplifier is in an enclosed cabinet, air movement could be severely restricted. Consider a small cooling fan for increased air circulation. Never remove the feet from the bottom of your unit, as there are ventilation holes on the bottom of your unit as well. Another reason for power transformer failure is a continuous heavy current draw through the unit over a prolonged period of time causing excessive heat buildup within your unit. This could be related to the impedance of the speakers you are using, the level of the volume control, and how many speakers you are using at one time. You can only use 1 pair of 4-ohm speakers, or 1 pair of 6-ohm speakers, or 2 pair of 8-ohm speakers. Any other combination or types of speakers that you are using other than what was just mentioned could lead to premature failure of your amplifier or power transformer. In addition, do not turn your volume control further than the halfway point. If you are doing this, you run the risk of damaging your amplifier or speaker system. (See Why Do I Keep Blowing tweeters/Midranges, And How Do I Prevent This From Reoccurring?). If the level of sound is not high enough for you when the volume control is at the halfway mark, then we recommend that you obtain a larger power amplifier. If you are going to evaluate the purchase of a larger power amplifier, you should choose one that has about double the power of the amp you are currently using. And be sure that your speaker system is capable of handling the power of the amplifier you are considering.

Jan 26, 2011 | Yamaha YSP-900

1 Answer

I have a very nice sansui 881 receiver I recently purchased. It is in excellent condition. I just did a little detail cleaning and polishing to make it look like new. It just needed a few bulbs changed. ...

Hi dom,
There is a way to clean it out. It takes a bit of work.
Follow this procedure.
0 Set up a place with paper towels laid down for obvious reasons.
2 Remove the top cover. If memory serves me correctly, there will be 4 screws located at the sides
along the lower edge. Two on each side. Then there may be screws on the back edge attached to the cover as well.
3 Lift off the cover.
4 NOTE: Near the very front of the receiver there will be some wires that move the pointer used for the FM station location. BE VERY CAREFUL NOT TO REMOVE THESE. TREAT THESE PARTS WITH GREAT RESPECT.
5 Carefully tip the receiver on it's side making sure it will support itself in this position.
6 Using a small soft brush, brush out the interior of the unit. Use caution while doing this.
7 Dampen but DO NOT SOAK some paper towels with a cleaner and wipe away. For tight areas
use cotton swabs. Dampen these but do not soak them. I recommend Viva Towels for this.
8 Take you time to do a good job. Don't rush.
9 If there are components that are under a grill internally, remove the grill to clean, if possible.
Doing this should clear up the odor. It will also help the heat dissipation characteristics of the internal components and help her to live a long life.
Hope this helps,
Best, Mark

Jan 15, 2011 | Sansui Audio Players & Recorders

1 Answer

My sony goes out and then there comes 'protected' on the display

Sounds like its over-heating.

Two things:

1. Unplug and flip upside down and use canned or compressed air and clean it out. Remove chasis if necessary, BUT, do not touch anything with your hands!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! The capacitors inside will hold LLLAAARRRGGGEEE amounts of electricity and can electricute you even while unplugged from an outlet. Just spray it out with the air

If that doesn't work....

2. Place a fan on top of the unit or on the vents. Do your best do keep the device WELL VENTILATED and COOL!

Air flow is key to lifespan of amps.

Oct 01, 2009 | Sony STR-DE405

1 Answer

When turning the volume up to the mid level spot on the dial the power on my yamaha rx-v793 clicks off. Apon turning the power back on,the unit will stay on as along as the volume is below the mid range....

Check your speaker connections, the unit is shorting out. Best way to make sure it's not the receiver is to disconnect all speakers then turn on your receiver,turn on a source like cable or dvd and turn up the volume on the receiver. If it stays on, you know it's not a problem with the receiver.

Now to find the problem; re connect speakers one by one, each time, turn on the receiver and turn up the volume, when you get to the wire causing the problem, it will shut off. At this point, disconnect the speaker wire at the speaker causing the problem to make sure it's not the wire itself. Make sure the loose wires do not touch each other as this will cause the unit to short or worse! If it still plays, then look at the speakers internal connections if possible. Look for the obvious, burn marks on a crossover or wires touching, if you find none, use a multimeter if you know how to read one and set it to resistance. If it reads 1... you've got a bad voice coil and the speaker needs to be replaced. Most often, however, is that a partial part of a speaker wire braid has touched the other. + to - and does not have enough of a load to short out until you turn up the volume. The other scenerio is if your wiring was "pre-wired" in your home for surround and there is a nail or screw in the wire and doing the same thing. If you still have issues beyond this, post a comment and I will help some more. Hope this helps

Jun 15, 2009 | Yamaha RX-V793

1 Answer

Protect error on agv8500

Hi there. I have the same unit. A darn nice piece of hardware. A couple of months back I noticed my cooling fan making noise. A few days ago I got the "PROTECT" message and the unit wouldn't power up. I turned it off for three days and it started playing again. Now I'm pretty sure it went into protect mode because it overheated. I just tried finding a Teac replacement fan and didn't see one on the web. My solution will be to adapt a small computer-type fan onto it to keep things cool. It works too well to let it die! Good Luck, Gborchers. GROGSTER

Nov 15, 2008 | Teac Audio Players & Recorders

1 Answer

Sound cuts out above medium volume

This is usually a heat problem. The more volume you ask of an amplifier, the greater the current (electrical) draw, the more current draw the more heat is generated. This is true of ALL electrical/electronic items.

As you describe it, the fuse is not blowing (stays on) so my choice would be a chip heating up and then shutting down. If that's the case (99% probabilty). The only other reason would be if the unit has an overload switch inside, it would react this way. Either way it's still a heat problem and truthfully nothing you can do.

Try this first though:

Is the Denon dusty inside? Dust can create 2 problems-heat and static electricity. Look through any vents you can get at. If the area around the unit is dusty chances are it is dusty inside. The best way to get the dust out is using a can of compressed air unless of course your vacum cleaner has a "blow" port.

In my shop, when heat is supected I use a can of freon th cool down chips, etc to isolate the component. This is not for a "layman" and strongly suggest bringing it into a shop.

One more question. If the unit using a knob for volume-do you hear a scrating noise when you hit the no volume zone? What happens if you go past the point quickly? I ask because sometimes there can be a bad spot on the volume. The volume knob is basically a circular resistor, whether digital or analog so this is a vague possibility (the other 1%).

If you e-mail me the serial number I can check with the Denon engineering department to see if there are any design problems as it may be a covered repair. It never hurts to ask.

Sorry to be the bearer of bad news


Jan 09, 2008 | Denon AVR-2803 Receiver

1 Answer

Internal cooling fan not spinning

There should be a thermistor mounted on the heatsink which will trigger the fan. The fan will not likely turn on if you are using your receiver for 2-channel music. Try using all amp channels by playing a DVD in DTS or AC-3 audio mode and crank up the volume - lots of bass will do the job. You can place a piece of tissue paper near the vent so you don't have to use a flashlight to watch and wait until it turns on. My receiver takes about 3 songs from the Eagles DTS DVD at high levels before the fan would turn on. As soon as the temperature is lower than the limit, the fan would turn off.

Sep 29, 2007 | Pioneer VSX-D511 Receiver

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