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
Hello, please check/replace the relais. If you need more info please advice. Arpi
Posted on Aug 12, 2007
Hello again,
if you leave your email I can send you the service manual.
Best regards,
Arpi
Hello,
the manual is sent by Pando.
Best regards,
Arpi
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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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 [email protected]
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