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Denon AVR-1508 Receiver problems - cuts off and goes into protect mode

I have this problem too. I disconnected all of the speakers. The receiver goes into protect mode after about 3 minutes. Also, I tried the reset routine (holding A and B speaker buttons while switching the device on) and it failed to reset. This is my second AVR-1508. I have double surge protection. All of my speakers are 8 ohm impedence and there is no short in the speaker wires (I checked with an amp meter.)

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  • dortmundb Aug 27, 2008

    Thanks for your response!!! Ok, so I've now tried the three experiments. The time to shutdown does not depend on the volume level at all. If unplugged overnight, I turn the AVR on and within 2-3 minutes, it shuts down, regardless of how I adjust the volume. There is no speaker hum and I've checked for voltage between the speaker lines. I now have the AVR on the floor by itself (not hooked up to anything but the wall) and I get no results. If left alone, the device powers up, works for 2-3 minutes and shuts off. If I try to then power the device back up, it goes directly into the shut-off mode with the red power light blinking. The device is under warranty, so I can ship it back, but since this is the second AVR to do this to me, I'm starting to wonder.

  • dortmundb Sep 26, 2008

    Dan,



    The place I sent the receiver said they don't furnish detailed reports. What I did get was this: "

    technical services rendered - PTEL IC 516 -15 volt regulator; replaced defective regulator IC. I called the place and asked about a lab report, and the guy said they don't do that??? I said this is the second one the went out on us, and we wanted to make sure it wasn't anything we should be doing differently, and he said they can't really speculate, but that regulators like this aren't really related to anything external...he said it's a good receiver, and not necessary to spend the big bucks..." I would be curious as to what this part does and if it is related to anything you can think of that I can avoid, or did I just get unlucky twice???



    Thanks!



    Craig

  • dortmundb Sep 26, 2008

    Dan,



    Thanks again. Is there something in my set-up that could have contributed to this failed regulator, or is it simply a part that went bad in your opinion? I will definitely get both regulators fixed but I'd like to be on the lookout for whatever I need to change so this doesn't happen again.



    Thanks again for all your help!!!



    Craig

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Sir,
I have some problem in my Danon avr 1508.
1. When i switched on the amplifier, there is some breaking sound in the speaker without any input, But when i played any input, it gets start with 23-24 volumn. I only worked hardly for few seconds. and den it goes to stand by mode(shows red light). There is hum after it goes to standby.


Please figure out my problem and help me with solution.

Posted on Jun 24, 2012

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I have the same problem . denon had changed knob and circuits ?! one day later ... same issue !
i have 5.1 evo tangent 4-8ohms and 2 technics 8ohmsand i use frquently A+B configuration

Posted on Nov 08, 2008

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Usually when the unit runs for a while before shutting down there are two possibilities:

1) There is a small amount of DC current present that effectively heats up the speaker coils enough to cause a temporary short circuit that kicks in the protect circuit.
2) The output transistors or bias transistors are sensitive to heat and breaking down again causing the protect circuit to kick in.

A few experiments to try:

1) Does the time to shutdown change depending upon the volume level?
2) Is there any background noise coming from the speakers? Listen to a blank tape for example. Is there a hum or any other noise that you would not normally expect?
3) If you have a DC voltmeter, check for any voltage between the speaker lines.

Update this and we'll try to narrow this down.

Dan

Posted on Aug 19, 2008

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  • ABRsvcs Aug 27, 2008

    If it takes 2-3 minutes to shutdown, I'm guessing that there is some DC voltage floating around inside there somewhere. Since this is under warranty, send it out. I would request a detailed report of the repair though. Since this is the second tmie with a similar problem. Personally, I'm surprised at this too. I have been a Denon authorized service center and never had a recall for the same problem like that. I'm sure it happens rarely. I guess you are the "lucky" one. Keep me posted.



    Dan

  • ABRsvcs Sep 26, 2008

    A 15V regulator will be supplying the pre-amp section primarily. If one misbehaves, it will create a voltage offset that will be detected in the output stage as a problem and the unit will shutdown. If they only changed the +15V regulator, and the problem happened again, I would request that they change both the +15V and -15V regulators. This should be common practice, but at a warranty station, they try to change only the failed parts, not the ones that may have been stressed.



    Send the unit back and request that both be changed if they find that one is bad.



    Dan

  • ABRsvcs Sep 26, 2008

    Nothing you could have done to create this problem. The service company, by not replacing both, may have caused the second one. By the way they probably saved $1.20 by not changing both. Send the unit back and request that if the problem is again a regulator that they replace both the plus and minus regulators.



    Dan

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