I have buzzing from all speakers from a Harmon Kardon 435 reciever even with all inputs and outputs disconnected except the speakers. I also switched off all breakers in my house electrical main panel and dissconnected all the ground wires from the main pane as a test. Is this dirty power from the street?
new: I really doubt your conclusion is correct about "dirty power" ..... check and tighten the pcb grounding screws that hold the boards to the chassis and the screws on the back panel that hold the rca phono connectors. electricitym . .
This is the 3rd new unit I have tried. They all do this in my home but not the store. thanks.
new: Light dimmers? Ceiling fan motor speed control ? Flourescent lights ? etc? Power supplies in computer ? TV ? VCR ? Also.... leave the unit where it is and use a long extension cord and plug it in another outlet several rooms away. electricitym . .
All breakers on the main service panel are off except dedicated braker to reciever. Therefore no other appliances etc on. I have no dimmers or flourescent lights. I plugged it into every outlet but the same results.
Is it near a radio or TV transmitter? What about an engine that runs constantly, like a generator or pump? Does the compass orientation of the receiver matter?
How are you certain it's not a ground loop? Have you disconnected all cable TV connections?
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Do you have cable TV locally? Sometimes that leaks enough to do this.
NAll cable TV coax is dissconnected. Only speakers and power.
I am in a basement room. There is no other generators, motors, TV transmitters, etc, unless its from my neighbor next door. All my breakers in the house are off except the one dedicated receptical that powers the unit.
Doesn't help. It's the street cable that leaks.
How big is the Harmon Kardon 435 receiver? Can you move it around? What happens if you short the antenna inputs? Are you close to a radio antenna?
NShorting antena has no effect. have tried it in different locations also. I am not near any radio, TV, or microwave towers.
I
Do you have any other radios that work OK?
NI have tried everything. I have disconnected all breakers from my main electrical panel and all the grounds and neutrals. Only one circuit to the reciever from the street. It changes in intensity during different times of the day. The power company does not know what I'm talking about or they are playing dumb. I'm Stumped!
new:
Another thought, take your receiver and a couple of speakers to a friend's house to verify that all is OK.
Does another type, brand, or model of receiver do the same thing in your home..... if not, and other receivers work OK then I would suggest that you be convinced to change your preferences for purchasing a stereo receiver.
-- Best Regards, Daniel Sofie Electronics Supply & Repair
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