Question about Denon AVR-1603 Receiver

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AVR-1603 - no Sound exept over Headphones is a weak signal

Hi technicans at this Form. I got a Problem with my AVR 1603 from Denon. Problem: If I turn it on the Realais clicking .. but with no Sound. If i connect a Headphone a weak Signal is hearable. My Powersuply for the Powermofets is around 47 Volts. Any Solutions for this Problem? I have a Sirquit Diagram of that Denon Amp. Thanks and sorry for my bad English ...

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Re: AVR-1603 - no Sound exept over Headphones is a weak...

First check the outputs at the output fets/transistors for any DC voltage. Reference your voltmeter to the speaker - terminal. If there is ANY DC offset, the amp is shutting down the outputs to protect your speakers from DC. Is the power supply + and - 47 volts? If only one supply is there That is your problem because the supplies should be symmetrical. Also look for any wiring problems from the amp to your speakers... any shorts? Try disconnecting all your speakers to totally eliminate any speaker problem and see if the relays still click. You should hear only ONE click when you first turn the amp on (delay of about 2-5 seconds). If they keep clicking the amp outputs are next. Also, is there any indication on the front panel of what is failing?

Posted on Aug 13, 2007

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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;
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Page 10

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Two front channels don't work, speakers and wires

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Headphones only have left channel on Denon AVR-588 Receiver

Hi peroty,

Two suggestions for you.

1. If you look at the headphone jack connecton do you see one or two black O-rings or black lines on the jack. If you only see one they are Mono headphones and you would only get sound out of the left side. If there are two black lines they are stereo headphones and you should get sound on both the left & right sides.

2. If after checking the headphone jack connection and there are two black lines on it then I would suggest try a different pair of headphones to see if a different set of headphones works fine.

If a different pair of headphones works properly the original headphones may be bad. If neither set of headphones work properly it may be the reciever that may need to be repaired.

I hope it's not the receiver, but let me know if you have questions.
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