Question about Denon Audio Players & Recorders

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Denon AVR 1804 Switch on and the display comes on but goes out after about 10 seconds. Whilst the display is on, the on/standby light flashes. After the display goes out the on/standby light still flashes only faster. Have disconnected everything but still does it

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  • lukey123 Sep 03, 2008

    Switch on and the display comes on but goes out after about 10 seconds. Whilst the display is on, the on/standby light flashes. After the display goes out the on/standby light still flashes only faster. Have disconnected everything but still does it

  • lukey123 Sep 03, 2008

    Switch on and the display comes on but goes out after about 10 seconds. Whilst the display is on, the on/standby light flashes. After the display goes out the on/standby light still flashes only faster. Have disconnected everything but still does it

  • lukey123 Sep 03, 2008

    Switch on and the display comes on but goes out after about 10 seconds. Whilst the display is on, the on/standby light flashes. After the display goes out the on/standby light still flashes only faster. Have disconnected everything but still does it. Screen goes off after third flash and saying reciever

  • lukey123 Sep 03, 2008

    Switch on and the display comes on but goes out after about 10 seconds. Whilst the display is on, the on/standby light flashes. After the display goes out the on/standby light still flashes only faster. Have disconnected everything but still does it

  • lukey123 Sep 03, 2008

    Switch on and the display comes on but goes out after about 10 seconds. Whilst the display is on, the on/standby light flashes. After the display goes out the on/standby light still flashes only faster. Have disconnected everything but still does it

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7 Answers

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  • Master
  • 624 Answers

I fix these receivers for a living and can tell you with certainty that the problem you have is one that will require the replacement of several parts. You will need to know how to solder and be able to purchase the proper parts.

There are 3 different most common reasons that they go into the protect mode, which is what is happening to your unit now.

1. Has a blown output channel in the amp that will require the replacement of both output transistors of the bad channel and the replacement of several resistors and a coupld of other transistors and a capacitor in the affected channel. You wil lneed a multimater to be able to check and findout which channel is bad. I can supply you with the part numbers you will need for the repair if you plan on doing it yourself.

2. A voltage regulator in the power supply is bad. They have several voltage regulators and it is a common problem for one to go bad. Once again you will need a multimeter to check and find which one it is and then get the part and replace it. I can supply the part numbers for you if needed.

3. A resistor that supplies the amplfier circuit has opened up and needs to be replaced. This is the least expensive repair, but not as common as the other two. Only one resistor would need to be replaced. You need a multimeter to verify that it is bad, I can tell you which resistor to check and loet you know by the readings with the meter if it is bad.

Those 3 problems are the most common reasons for the receiver to shut down like your is doing. I work at an authorized Denon repair center and have repaired hundreds of Denon recievers so I am certain that the problem you have is one of these three listed.

Let me know if you plan on trying to fix this yourself and I will guide you thru the repair and even email you the service manual for a reference to do this repair. It is not an easy job, but it is the problem you are having. As I said before, I fix these receivers all the time myself, and I know how to fix them. Let me know if you want further help with this.

Dave

Posted on Sep 03, 2008

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  • Dave DeGain
    Dave DeGain Sep 03, 2008

    The repairs for these receivers normally run from $100 to $200 depending on which problem is the cause. Your receiver is about $500 to $800 brand new, so it is worth repairing.

    Resetting the unit will not help, there is no special sequence of flashes that will tell you anything about the error. it is going into protect mode for one of the three reasons I listed above.


  • Dave DeGain
    Dave DeGain Sep 08, 2008

    Did you ever read my solution to your problem? I actually have hands on experience with Denon's and can give you the form you need with the address to ship it to if you decide that is what you will do.



    I know you had hoped for a solution that you could do yourself, but some things just can't be fixed without a service technician. If you have some experience with electronics, I could actually guide you thru the repair. Nobody else that I know of here at FixYa! could do that. I may wrong, but I have seen no proof of anybody else here having the hands-on experience with these Denon's as I do. I even have the service manual in PDF format that I can email to you. It won't tell you what is wrong, but it has schematics and board diagrams that would help you to locate the bad parts that must be replaced to fix your unit.



    To do this yourself you would need a multimeter and soldering iron. As well as some solder and solder wick (to remove solder from the bad components that must be replaced).



    It would be appreciated if you would respond with an update and rate this solution.



    Thanks,



    Dave

  • chuck starck Apr 03, 2013

    Just found this thread. Thanks for all your time in assisting everyone. I'm an old tech from 50's and have serviced about anything electronic. I have found in my Denon avr 1804. one channel has shorted outputs, 4 .22ohm resistors and a .47ohm resistor, these are all open. Don't know the wattage. They look like metal film 1watt for the .22's and perhaps a 1/4 watt .47. Not sure. Also don't know the process to balance the output without the manual. So asking for resistor wattage and if you have the pdf, that would be neat. Don't know how we accomplish this. Also have read that there is a resistor change in the power supply, questioning that as well

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Its the problem of over voltage or a faulty --ic--.get repaired .no other option.it will work and wont cost u much.

pls do rate the solution

thanks.
regards.
fixya expert team

Posted on Sep 03, 2008

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It seems that this product (and it's kins) have an issue.

Read this post

Posted on Sep 03, 2008

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  • 89 Answers

Try to reset it

To re-set the 2802, just do as follows:

1. Switch off at unit's main power switch.
2. Hold A & B buttons and turn power back on.
3. Check entire display is flashing at approx. 1 second intervals, release the 2 buttons, microprocessor is now initialized.

Hope this helps.

Posted on Sep 03, 2008

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  • Master
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Your receiver has problem in Amplifier section and that's why shifted to safty mode to avoid further damage. Please contact nearest Denon service outlet for proper repair.
Regards,

Posted on Sep 03, 2008

  • Shahid Electronics
    Shahid Electronics Sep 03, 2008

    Hi,

    Denon Support might help you to locate nearest service dealer.

  • Shahid Electronics
    Shahid Electronics Sep 03, 2008

    Already explained to you that your receiver has problem in Amplifier section and qualified tech person from Denon will handle it because receiver might need some defective parts replacement. It doesn't seem issue of wrong settings. Please contact above said Denon Service link.

    Regards,

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  • 1,263 Answers

You have an internal issue that can't be repaired by you. my suggestion is either take it to the place you bought it if it is under warrenty and have it replaced or take it to a repair shop. however it might cost as much to repair it than to get a new one.

Posted on Sep 03, 2008

  • Ronald Mueller
    Ronald Mueller Sep 03, 2008

    well gees you guys are just rich. i told him the first time out that it needs to be repaired it's just common sense

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  • Denon Master
  • 19,396 Answers

Try unplugging the power cord for ten minutes, see if this clears the error. If it flashes a number of times tell me how many time the ligjht is flashing

Posted on Sep 03, 2008

  • Ginko
    Ginko Sep 03, 2008

    Try also keeping start button pressed for ten seconds.

  • Ginko
    Ginko Sep 03, 2008

    Your stereo has a safety switch device that keeps the unit off when it detects a short, a faulty component or an overvoltage.

    If you want to do it yourself you need to take it apart and to test, multimeter in hand the components, starting from power adapter section and amp.

    If you do not get any error code the unit must be tested dirtectly.


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1 Answer

I have a old denon avr-1804. try to switch on power but can not. just appear a main power red light flashed rapidlly. please tell me why?


Greetings
the red flashing LED is that the Device is in protection mode.
the internal power supply . +15 volts and -15 volts are defected you need to be replace it ... Regulators 7915 and 7815 .... these you should change , might also need to check capacitors .
these are common defects for Denon . AVR units.
Good Luck
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