Question about Denon AVR-887

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My Denon AVR-887 Keeps turning itself off

I have the same problem, reset is done and stills shutting off,

what´´s the transmitor was shorted?

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  • 10 more comments 
  • mist_company Feb 25, 2009

    denon avr887, reset is done and stills shutting off, all speakers are disconnected

  • mist_company Feb 25, 2009

    i have five 6 ohm morel satelites, only changed the center one, it´s 8 ohm, shut off since the new speaker, with or without the speakers stills shutting down

  • mist_company Feb 25, 2009

    should a transistor be bad? where´s the center amplifier?

  • mist_company Feb 25, 2009

    how can i identify each chanel?

  • mist_company Feb 25, 2009

    no heating amp is off 4 days ago, could a 8 ohm center speaker shorted a transistor? the other speakers are 6 ohm, if so how can i identify the center amplifier?

  • mist_company Feb 26, 2009

    the same with mine, did they changed a transistor or what is the transmitor?

  • mist_company Feb 26, 2009

    not a shorted transistor, + - voltages are ok, what else could it be?

  • mist_company Feb 26, 2009

    fuse is ok

  • mist_company Feb 26, 2009

    the backup battery has something to do with the protect mode?

  • mist_company Feb 28, 2009

    checked the 7 amplifiers and all exactley the same, no shorted transistors or resistros, measured the output voltage before it protects and i have 53dc volts

  • mist_company Feb 28, 2009

    power relay or the speaker ones?

  • mist_company Mar 02, 2009

    yesterday didn´t protect itself, everything normal but no sound

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8 Answers

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Just check the transistors and let us know the readings as suggested by other expert abrsvcs.so that we can tell you where the problem lies.if you find the faulty parts replace them to solve the problem.thanks.

Posted on Mar 02, 2009

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Hiya

it sounds to me that it is the actuall relay thats at fault here as it shuts off when turned on. as my sony amp dont this all i done was to relpace the relay and all was good again......

Posted on Feb 26, 2009

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Check the speaker wires to be sure there are no loose strands of wire touching from one terminal to another. Check at the back of the reciever and on the speakers. You have to check real close because those strands can be very fine and hard to see.

If that's not it, then check the whole length of speaker wires to be sure there are no bad spots were it's been chewed on by a pet or gotting pinched or nailed through it, etc.

Lastly, if the receiver is not getting adequate ventilation, it could simply be overheating. If so, it needs to be allowed more air space around it.

Posted on Feb 26, 2009

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Fuse?

Posted on Feb 25, 2009

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  • 90 Answers

I have one and the same thing happened. try resetting your microprocessor and if that does not work, then check the wiring of the speakers. if that is working fine and no wires are touching then I unplugged everything and was still having the issue. took it in for service and it was found that the transmitor was shorted as the speakers that I was using was too high in ohms. it is possible that it could be your caps also if resetting the microprocessor does not help. You can find out how to reset the microprocessor from your manual. If you have the Denon avr 887 with the system turned off hold the power on button and the speaker A and B at the same time for a few seconds. This is compatible to reboo

Posted on Feb 25, 2009

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Does the unit have plenty of breathing room?

Did anything change with your setup recently, equipment-wise?

Did you move the receiver or your speakers recently?

Did you rewire your speakers recently?

Do you notice if it happens when you turn the volume up to a certain level if you are able to do this?

Do you have a blown driver in one of your speakers?


Disconnect each speaker individually while leaving the rest connected and see if the problem is alleviated by disconnecting a particular speaker. Let me know what you find after going through all of the above as this is where you should start.

Benjamin

Posted on Feb 25, 2009

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Hi!

Please check for any any wire that are cut and shorted with the case of your denon. Also check for the circuit breaker and try and use it with a diffrent power socket.

Posted on Feb 25, 2009

  • 2 more comments 
  • Rylee Smith
    Rylee Smith Feb 25, 2009

    Check the power supply for the lamp, it may have a problem.
    Check also for over heating caused by dust or fan.



    Try disconnecting each speaker. Does it shut down even when the speaker wires are all disconnected from the back panel of the receiver?

    If so, it is almost for certain one or more of the power transistors/modules are shorted down and need replacement.



    Please revert for any clarifications.



    Thanks

    Rylee

  • Rylee Smith
    Rylee Smith Feb 25, 2009

    Disconnect the power cord; disconnect all speaker wires at the back of the receiver. Then turn it on. If it stays on with no speakers, connect just one at a time. It could be that you have a bad speaker or a short on one of the speaker wires.



    A bad transistor can also cause a short inside the unit activating the protection circuit.

    If you have opened the unit then you can check for the burnt component or a faulty resistor with a multimeter. However, before checking i would suggest you to switch off the unit for atleast 1 hour to drain off the current. Also, check for any burnt capacitors.







  • Rylee Smith
    Rylee Smith Feb 25, 2009

    Yeah using the speakers that are not recommecded may have burnt the resistor or a transistor in the unit and this is why it keeps shuting down.

  • Rylee Smith
    Rylee Smith Feb 26, 2009

    If you can check your unitthen check for any burnt out components and if you find one then replace it. And, if you can't figure out a bad component then you would be required to check the all the components (especially all the transistors).



    You can check the transistors as shown in this link(You have to switch off your denon before checking the transistors)---



    Checking a Transistor





    No, the protection mode is not due to backup battery. A device enters the protection mode when an internal component is faulty.



    Please ask for any clarifications.

    Please rate this solution as FixYa if you've found this solution useful.



    Thanks

    Rylee



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The unit is in "protect mode". This means that it has detected a problem and has shutdown to prevent further damage. Since the speakers are disconnected, the problem is internal. In most cases, the output transistors are shorted and need to be replaced. If you look inside, you should see a nunmber of 3-legged parts that are attached to a heatsink. These are the output transistors. If you have no experience with electronics repair, you should bring this to a service center. The parts will cost between $15-$25 for this repair.

Dan

Posted on Feb 25, 2009

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  • ABRsvcs Feb 26, 2009

    To answer your questions:



    1) Using an 8 Ohm speaker rather than a 6 Ohm one DID NOT cause this.



    2) These units are set up such that a problem in ANY of the amps will cause the unit to go into protect and shut the whole unit down.



    3) No reset will resolve this problem. There are defective parts.



    If you have electronics experience, please update this and we can continue to work to find the faulty part(s) and repair this.



    Thanks,

    Dan

  • ABRsvcs Feb 26, 2009

    Probably the only way for us to resolve this is for you to provide some diagnostic information. Remove ALL of the output transistors (mark where each valued one goes so you know where to put them back). Also, I think that either the surround or center uses a multipin transistor looking part for the amp, so that needs to be removed too. Next turn on the unit. It should stay on without going into protect mode. If so, then measure each of the pads of all of the output transistors with a DC voltmeter to ground. Post the results here. WIth that info, I should be able to guide you to the faulty part(s)



    Dan

  • ABRsvcs Feb 28, 2009

    I'm sorry about all of the folish advice that has been posted here, but there are defective parts inside your unit. If you can remove the output transistors and provide me with the readings I requested, I should be able to tell you the defective parts. This is what I do for a living. Please help me to help you.



    Thanks,

    Dan

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