Question about Denon AVR-1603 Receiver

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Sudden hum in speakers connected to Denon AVR-1603

I came back from vacation to find that no matter what is playing on my receiver, there is a loud steady hum now coming from the speakers. I have disconnected everything to eliminate the chance it is due to a bad input ... no change. I have looked inside to see if there was an obvious burn-mark or popped capacitor or similar ... there are no visible problems. Everything else works. Do you have any suggestions? I am an electrical engineer, but I work with computers, not audio equipment. I am comfortable with technical talk and I can handle a soldering iron.

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  • Jeff Wright
    Jeff Wright Aug 12, 2007

    I assume you mean "relays". I don't know what they look like, but send me the manual and point out where they are and how to test them. My email is jeffw@nerdsonsite.com

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The hum is not the relays! It is a bad filter capacitor in the power supply. Go in the power supply, and with a multimeter, on the AC range, go and measure all of the main capacitor and see if you get a small AC voltage across it. If you do, replace it. The relay does nothing more then switch the speakers in and out of the circuit.

Posted on Aug 13, 2007

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Hello, please check/replace the relais. If you need more info please advice. Arpi

Posted on Aug 12, 2007

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  • Arpad Kothai
    Arpad Kothai Aug 12, 2007

    Hello again,

    if you leave your email I can send you the service manual.

    Best regards,
    Arpi

  • Arpad Kothai
    Arpad Kothai Aug 13, 2007

    Hello,

    the manual is sent by Pando.

    Best regards,
    Arpi

  • Arpad Kothai
    Arpad Kothai Aug 13, 2007

    Hello,

    best way to check the relays is by replacing them. RLY 101-104, RLY105, RLY106 page 22 of the manual.

    Best regards,
    Arpi

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1 Answer

Denon AVR1603 RESET


Starzy, to reset on a Denon AVR-1603
  • power off the unit using the front panel Pwr switch
  • press and hold SPEAKER A and B buttons;
  • keep pressing on the speaker buttons, switch on the AVR
  • when the display is blinking release buttons Check the attached links,instruction and guides, Good luck
    "I hope this helped you out, if so let me know by pressing the helpful button. Check out some of my other posts if you need more tips and info."
http://www.avsforum.com/forum/90-receivers-amps-processors/1386123-help-denon-avr-1603-shuts-down.html
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Check to see if there is a way to adjust the balance for the speakers or set individual volumes for each speaker.

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We have a Denon AVR 1603 approx. 7 years old. Over the past few weeks, when we have been playing CD's the power clicks off. So we have to turn the system on again from our universal remote. Today,...


Any device has only so many self-protection cycles in it before it gives up the ghost.

Generally speaking, an amp attempts to protect itself from heat, shorts, overloads and operator exuberance by refusing to turn on or stay on.

Overloads can be from excessive periods of high output or marginally low impedance loading by the speakers; and shorts would be wiring issues or a speaker blowing up.

You should be able to feel if it's hot. WHY is it overheating? Make sure it has sufficient ventilation on all sides and that vent holes are not blocked by dust balls. Ensure the fan (if equipped) is running as designed (some only operate on demand). Clean dust and debris from it.

If the amp comes back on after cooling, you're lucky. They only have so many self-protection cycles in their lives so continuously resetting or cycling their power without addressing the cause can do more harm than good.

If it protects immediately on a cool power up you should disconnect the speaker connections and try it 'naked'. If it comes up then diagnose which lead(s) are shorted. If it does not come up the problem is internal and should be left to an experienced and competent hands-on tech.

Check for loose speaker connections at the speaker as a root cause for intermittent shutdown.

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hi,
may be there was some loose contact in ur receivers rear connections.thts why it produce the loud hum. use good quality inter connects. check is the all connectors are properly inserted or not.
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No, you have to follow the procedures in the manual to inform the unit that there is a subwoofer, then select some parameters on how it is used depending on the functional sizes of your other speakers.

http://www.retrevo.com/s/Denon-AVR-1603-Receivers-review-manual/id/363bh846/t/1-2/

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First of all please check the mode in which you are operating. Use the tester to see if there is tone on the speakers. Use a good DTS source and swtich over to 5.1 to check for requrired levels. If there is no sound yet, please open the cover and check for the connections to the front channels, check if the relay is clicking. You will have to look into the output mosfets for damage. for this the main board has to be accessed. If you think that you are not able to go deeper into find out the nearest Denon service centre. many such centres do not accept a set if tampered and so you need to be careful not to make it more costly. Hope my advice helps. Good day

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