Question about Denon AVR-1604 Receiver

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Protection Light Flashing

Protect Light Flashing. I too have one of these with the same problem,the unit is only 3 years old . I too did the troubleshoot check on both AVR and speakers but still the same . I was sent a sevice manual by Denon and as a result of a quick study of the circuit diagram , I tried diconnecting the jumper link to the processor which is labelled 'Protect'. The effect of this was that when the unit is turned on , the display is now visible as normal , but no sound from the speakers . It seems that the main processor requires a very small voltage from the output of the power transisitors to trigger the main processor to operate the speaker relay circuitry , but when there is an overvoltage ( whether of an intensity harmful to speakers or not) , the 'protect' circuit is triggered and remains so. Can anyone offer some further assistance ?

Posted by malcolm robartes on

  • malcolm robartes Jul 27, 2007

    Hi Techman,
    Thanks for the suggestion . I think what I did confirms that the main processor is working fine . When I checked the speaker outs with a MM before I cut the protect link wire , I had what appeared to be a slight low voltage leakage on the centre speaker with all others being stable .
    Yes I have a PDF of the sevice manual , which I can send you if I can have an email address to send it to.
    Cheers
    Malcolm

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You will need to measure the output transistors as well as the driver transistors or IC's for shorts, as it is a DC voltage that will trigger this protection circuit. If you have a PDF of this service manual, I would like to take a look at it and to tell you what to check.

Posted on Jul 27, 2007

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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 .
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