Hi! Do yours Conions buzz a bit when they are turned on and not playing? It's a gentle buzz from the speakers. I think I read about it somewhere... but I can't find it.
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A gentle buzzing sound
- Thread starter Megablast_73
- Start date
Transistorized
Member (SA)
Both of mine do when plugged in. You have to put your ear next to the speaker, but it is there. I wouldn't be bothered with it unless you are hearing it over your music. At that point, it could be an indication of a filter cap failing. Obviously, this goes completely away on batteries.
Transistorized
Member (SA)
I am self taught so I wouldn't do anything until you have consulted with a professional. Do not trust me as I am not a professional with electronics repair. I am more mechanical (tape decks, etc.). Still, a slight hum I would consider normal if you can only hear it with no music playing. Personally, I would leave well enough alone if that's the case. But to answer your question as best as I can and from looking at the schematic, I can see the bridge rectifier circuit after the step down transformer and four capacitors that filter between the diodes. They are marked [C801 / C802 / C803 / C804]
I might get yelled at for suggesting the wrong thing in my diagram so I am taking a chance showing you this because I might not have a clue what I am talking about. So I want to be clear, I am not a professional and I do not like to give false advice. But IMO, these caps outlined in red appear to be what you are looking for. Members such as @caution and @Superduper are truly the ones who have likely been here and done this.
caution
Member (SA)
Check the giant 3300uF cap on the amp board, it's C259.
I had to replace that before when I had background buzzing.
@Transistorized those caps are to control the 120Hz ripple on the rectified DC and shouldn't make a difference. Ceramic caps rarely fail, it's the electrolytics that give us so many problems
I had to replace that before when I had background buzzing.
@Transistorized those caps are to control the 120Hz ripple on the rectified DC and shouldn't make a difference. Ceramic caps rarely fail, it's the electrolytics that give us so many problems
Transistorized
Member (SA)
Thank you Caution. I doubt that I am ever going to be good with schematics. I am glad I added you in. One good trait I have is I'm not afraid to admit when I don't know jack about somethingCheck the giant 3300uF cap on the amp board, it's C259.
I had to replace that before when I had background buzzing.
@Transistorized those caps are to control the 120Hz ripple on the rectified DC and shouldn't make a difference. Ceramic caps rarely fail, it's the electrolytics that give us so many problems
Maybe one day electronics repair it will make sense to me.
Thank you Caution. I doubt that I am ever going to be good with schematics. I am glad I added you in. One good trait I have is I'm not afraid to admit when I don't know jack about something
Thanks for the detailed info guys. This noise is not a big problem. I wanted to make sure if you experienced it too. I will take a look at this C259 while doing some work on it.
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caution
Member (SA)
You bet! Yeah, C259 is the likeliest of culprits because it hangs between ground and the main rail that powers the amp chips, so anything goofy going on with that cap will have a direct impact on all audio.