Has anyone experiencing buzzing sound from H/K avr510? (1 Viewer)

[Lam Nguyen]

My Harman Kardon avr510 makes this buzzing sound sometimes when it is first turned on, after a few minutes, the receiver gets warmer and the buzzing goes away. This doesn't happen all the time, just more likely if I haven't use it in a while. This is something I have noticed for over a year now but it never really bother me too much, just wondering any knows what is going on. Thanks in advanced.

 

[JohnSer]

Lam,

Is the buzzing coming from receiver or from the speakers? A buzzing sound from the receiver might be a slightly loose part of the chassis or heatsink, or sometimes a component. If it is hum from the speakers (all channels), there is service bulletin on that model. A cap in the regulated power supply is recommended to be changed. See your closest HK service center.

JohnS

 

[Lam Nguyen]

Thanks JohnSer,
The buzzing is definately coming from the receiver, while the buzzing is going on, the sound coming out of the speakers sounds fine. What can I do?

 

[JohnSer]

Lam, use your hand to dampen the outside parts of the chassis. If it makes a difference in the noise, try tightening down the chassis screws. Sometimes transformers will make a slight buzzing noise. But, if it is something inside, its time to take it to a tech, or just live with it.

JohnS

 

[Lam Nguyen]

Thanks JohnSer,

Definately not the chassis, it goes away when the amp get warm. I should contact HK.
Good Day!