Buzz on Pioneer A400

Smiffy · 16th January 2006, 05:15 PM

Hi All
Trying to cure a buzz on a Pioneer A400 amp.Its there on all inputs.It is not there if there are no inputs(nothing connected)I have tried 4 sources(Pioneer laserdisc player,Sony dvd player,Pioneer dvd player and Faroudja dvd player)The only thing earthed to the mains is the A400.I have tried different interconnects.The buzz rises in level as the volume is raised(with source on pause).Have a schematic.Any ideas where to start anyone.Thanks for any inf.Smiffy

anatech · 16th January 2006, 05:25 PM

Hi Smiffy,
Try connecting a source that is not connected to a television or anything else (like cable).

-Chris

Netlist · 16th January 2006, 05:25 PM

A bad soldering or broken ground track around the inputs is my guess.

/Hugo

Smiffy · 16th January 2006, 05:35 PM

Hi Guys
Chris.
I tried the amp with only one input.The dvd players or laserdisc player.Nothing else was connected.
Hugo.
Will check later.
Ta both of u for reply
Smiffy

anatech · 16th January 2006, 05:38 PM

Hi Smiffy,
Therefore, I agree with Hugo. It sounds like an open ground somewhere.

-Chris

16th January 2006, 05:15 PM	#1
Smiffy diyAudio Member Join Date: Aug 2002 Location: UK	Buzz on Pioneer A400 Hi All Trying to cure a buzz on a Pioneer A400 amp.Its there on all inputs.It is not there if there are no inputs(nothing connected)I have tried 4 sources(Pioneer laserdisc player,Sony dvd player,Pioneer dvd player and Faroudja dvd player)The only thing earthed to the mains is the A400.I have tried different interconnects.The buzz rises in level as the volume is raised(with source on pause).Have a schematic.Any ideas where to start anyone.Thanks for any inf.Smiffy

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16th January 2006, 05:25 PM	#2
anatech diyAudio Moderator Join Date: Jun 2004 Location: Georgetown, On	Hi Smiffy, Try connecting a source that is not connected to a television or anything else (like cable). -Chris

16th January 2006, 05:25 PM	#3
Netlist diyAudio Moderator Join Date: Jan 2003	A bad soldering or broken ground track around the inputs is my guess. /Hugo

16th January 2006, 05:35 PM	#4
Smiffy diyAudio Member Join Date: Aug 2002 Location: UK	Hi Guys Chris. I tried the amp with only one input.The dvd players or laserdisc player.Nothing else was connected. Hugo. Will check later. Ta both of u for reply Smiffy

16th January 2006, 05:38 PM	#5
anatech diyAudio Moderator Join Date: Jun 2004 Location: Georgetown, On	Hi Smiffy, Therefore, I agree with Hugo. It sounds like an open ground somewhere. -Chris

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