Question about Denon AVR-1603 Receiver
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.
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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