Question about Denon AVR-484 5.1 Channels Receiver

4 Answers

Protection mode Hi, I just got this unit and when when I power it up after couple of seconds goes to stand-by mode with the led flashing fast. Looks like the protection is triggered. It does the same even with out anything connected to the receiver. I'll appreciate your suggestions. Thanks

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  • stbil Feb 03, 2008

    Hi Robotek,
    I'm ready for your directions with multimeter and Weller in my hands. I have some knowledge as a TV cameraman but I didn't deal with amps for more than 20y so I'm not aware of the current amps technologies. Hope for your help:)! I did check for any burn-outs on the circuit boards but everything looks normal. Does not look like abused unit. I don't have the schematics and I don't know were the control points are. It goes in protection mode at the same point ? when ?receiver? is displayed so I assume thats the trouble section. Hope for your respond :).

  • stbil Feb 04, 2008

    I just discover that -15V is actually -9V. This is out of IC102 (7915-negative voltage regulator) at R146. The +15V is +15V.

  • stbil Feb 04, 2008

    It's OK. Were should look for this regulator. Any suggestions for retail or online store?

  • stbil Feb 08, 2008



    FixYa ! :)))



    Thank you very much Robotek!!! Looks like I'm not as rusty as I thought :). Our friend Murphy came to visit me but he is gone now :). 7915 has to be isolated from the radiator. Runs hot but probably supposed to because the radiator is quite big. There are couple R22s after the traf – R141 and 142 witch blows too in case Murphy is around. Although it may looks I did the job myself in fact you are the one! Your original post led me to this regulators. Thanks again!!! BTW if you need the schematics I'd be happy to email it to you. It's in pdf.



    Cheers

  • stbil Feb 08, 2008

    Sorry for the spelling - it's “which” instead.

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Hey there,stbil, , there are two potential causes. One is speaker terminals have short-circuited, solution being to power down system, connect speakers properly, and start again. Second, the unit is not properly ventilated, and therfore running temps are potentially hazzardess to the system. Solution is to cool system down, ensure all vents are clear and inside of casing is clear of dust and other particles. Good Luck!

Posted on Feb 02, 2008

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Hi you are right it is going to standby mode due to a fault on the board its going to be some thing like blown resistor or along those lines as the unit comes on and then goes into stand by youll probably find that the blown resistor or short is going to be on or near the amp part of the board could even be near one of the outlets on the unit near the back of the board if it was something conected with a fault with thee power side then you will find it would probably blow a fuse and wouldnt light up at all but as it comes on then its more than likely a resistor.
Now the only way of finding out witch one or two has gone is by testing them and to do this you will need to find schematics so as to follow the circuit diagrammes and also youll need this for part numbers of any replacements needed.
It will be a cheap repair even if you have to take it in to get repaired.
You could try using a search engine to look for some schematics for your unit as you can often find them on the net.
But to test the resistors your going to need a multimeter and if your doing the repair yourself your going to need a decant soldering iron.
Let me know what you want to do and i can help you further ok

Posted on Feb 02, 2008

  • paul proctor Feb 02, 2008

    Hi check what ROBOTEK is telling you as he seems to have more knowledge with these than i do ok if he can talk you through what you need to do then follow his advice ok

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  • 1,512 Answers

Yes, unfortunately the amp is going into protection mode. Protection mode is a self resetting circuit, that checks up to 7 different parameters of the amps operation initially at turn on, and then continuously monitoring for problems during operation. engagement of the protection circuit with nothing connected is generally caused by a fault internally that is producing a DC offset at one of the amps speaker outputs. It may be caused by many sifferent things. Dry solder joints are a common problem, blown output transistors, damage from overheating, also feature up the list. I can talk you through checks to do inside the amp to determine the problem if you like. You will need a multimeter and philips screw driver to go further. Its a nice amp and worth repairing... but if you have just got it, i suggest referring back to whom you got it from. For an exchange or maybe your money back. I am happy to assist you further, just ask.

Posted on Feb 02, 2008

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  • Graeme Ross
    Graeme Ross Feb 04, 2008

    I am going to look for a manual for this to make it easier to communicate about the problem. there are some things to do first that may resolve the problem


    1. First thing to do is carefully inspect(with the best lighting you can get) the PCB about the output stages for dry solder joints. If any look susect at all... blanket resolder the stages. That means every land. I often do the whole board. Murphies Law... If there is one, there may be many.

    2. Then clean the board down with PCB cleaner(or acetone) with a cutdown paintbrush to remove flux.

    3. Reinspect your work for shorts, solderblobs, or splatters. A mistake here can cause more problems.

    4. Fire it up after doing the work and see what happens

    If you are not good at soldering, then maybe get some practice in first on an old peice of gear that you can wreck. Let me know how you go. Good luck:)

  • Graeme Ross
    Graeme Ross Feb 04, 2008

    hey nice going. That is not an uncommon problem. Those regulators have been commonly failing for years. Check DC first. The first rule of servicing. Well done. Change the regulator and see what happens. Check how hot it is running also, there may be a short down the line of it is.

  • Graeme Ross
    Graeme Ross Feb 07, 2008

    You can get them from Farnell electronics in the UK.



    http://uk.farnell.com/jsp/search/browse....=



    pick out the device that is the same package as yours.

    Happy Fixing

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  • 217 Answers

The fuse in it may already have blown.

Posted on Feb 02, 2008

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