Question about Denon AVR-681 Receiver

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How to reset a denon AVR 681 - Denon AVR-681 Receiver

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Unplug the AVR 681, press and hold the "Speaker A" and "Speaker B" buttons. Plug in the unit then release both of the speaker buttons after a few moments.

Posted on Mar 15, 2009

  • mardydom
    mardydom Apr 02, 2013

    Great post. I have a hard time trying to figure out how to operate this amp without a remote. I bought this thing second hand. It took me hours how to get over with this amp (cant hear sounds). Until i read this posts. Thank you sir. you saved me from throwing this thing. Great sounding amp at low cost.

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SOURCE: on standby

Troubleshooting without a schematic. I found two 1 ohm resistors open in the positive 15 volt regulator circut. Located between associated power supply rectifiers and the 15 Volt Regulator. After checking for any short circuits I replaced the resistors. Ths restored operation of the unit. Owner thought the "Cable Guy" may have plugged something in wrong.

Posted on Dec 09, 2007

  • 395 Answers

SOURCE: Denon AVR-681 receiver

this manual is the same as the 681 the only difference is the front input and power difference. this web sight http://www.usa.denon.com/AVR1602_682_ownersmanual.pdf

Posted on Jan 13, 2008

dunnbiker
  • 8546 Answers

SOURCE: My Denon AVR-681 turns off when the volume is

I'ts trying to protect itself. Evaluate why.

Generally speaking, an amp protects itself from heat, shorts and overloads.


Overloads can be from excessive periods of high output 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 'naked'. 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 hands-on tech.

Excessive volume will cause any amplifier to exceeds its 'safe' operating parameters and put out a lot of 'dirty' power. As it is distortion more than raw power that kills speakers you need to keep away from pushing the amps beyond their RATED power.

Posted on Jan 22, 2011

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1 Answer

Service manual


http://www.smpcshop.com/Denon-AVR-1601-AVR-681-Service-Manual.html

Sep 11, 2013 | Denon AVR-1601 Receiver

1 Answer

My Denon AVR-681 turns off when the volume is loud.


I'ts trying to protect itself. Evaluate why.

Generally speaking, an amp protects itself from heat, shorts and overloads.


Overloads can be from excessive periods of high output 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 'naked'. 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 hands-on tech.

Excessive volume will cause any amplifier to exceeds its 'safe' operating parameters and put out a lot of 'dirty' power. As it is distortion more than raw power that kills speakers you need to keep away from pushing the amps beyond their RATED power.

Jan 22, 2011 | Denon AVR-681 Receiver

2 Answers

Unit turns on for about 5 seconds and turns off with stand by light flashing


you have shorted output transistors which is causing the unit to go into protect mode. You can try factory reset by turning off unit then holding down speaker a and b buttons then turning back on.

Apr 12, 2010 | Denon AVR-681 Receiver

1 Answer

Is the reciever HDMI ready?


Check the back panel for a HDMI jack. No jack no HDMI.

Nov 16, 2009 | Denon AVR-681 Receiver

2 Answers

Denon AVR-1601


This is a very common problem with denon receivers of the 2001-2-3 vintage. On almost every one, there are 4 little "surge" resistors in the power supply. These werent quite robust enough from the factory and one day would just burn open for no reason. Well, actually there is a reason, the "surge" that happens every time you power the unit up eventually weakens the resistors and then they pop. You need to take this to a denon service shop as I GUARANTEE they have seen this before. They need to check resistors in the picture, locarde above the **** rectangular connector. Resistors numbers R141, 142, 148, 149: 75f69d7.jpg These resistors when measured, should be less than 10 ohms each. If they are more, then they are blown. If they are blown, then have the shop check the channels for blown output transistors. If the outputs are OK, then these resistors should be replaced with 1 ohm 1/2 watt metal -film flameproof resistors. You might need to be prepared for a large bill, because the entire unit must come apart to replace the resistors, however, just checking them takes only about 10 minutes... Good luck and don't try this at home. Rob

Apr 08, 2008 | Denon AVR-1601 Receiver

2 Answers

Resistors


If the resistor has been completely destroyed, look on the board for the circuit designation (eg. Rxxx). With that someone with the service manual or access to teh schematic can provide the value and wattage.
Dan

Mar 19, 2008 | Denon AVR-681 Receiver

1 Answer

Denon AVR-681 receiver


this manual is the same as the 681 the only difference is the front input and power difference. this web sight http://www.usa.denon.com/AVR1602_682_ownersmanual.pdf

Jan 13, 2008 | Denon AVR-681 Receiver

2 Answers

On standby


Mine does the same thing..........
If anybody knows the problem ........please e-mail me.
StageRulz@Yahoo.com

Oct 04, 2007 | Denon AVR-681 Receiver

3 Answers

Powers on 5 sec then powers off


Mine does the same thing..........
If anybody knows the problem ........please e-mail me.
StageRulz@Yahoo.com

Nov 17, 2006 | Denon AVR-681 Receiver

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