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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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

Anonymous May 14, 2012

Hello Mr. McKibben,

Ive checked the the Voltage -> + / - 47 Volts
The Main Amp should work.
Theres are +5 Volts at the protection Pin ... It looks like there is another Error and the CPU decited to get into protection Mode.

Do you have a hint for that problem Sir?

Stefan

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