Power cord replacement - ground?

fallbalance · 21st October 2009, 04:55 AM

I'm replacing the old power cord in my Yamaha M80 amplifier. The original cord has no ground, but my replacement does. What should I do with the ground lead?

I could wire-nut it... orrr would it be put to better use if it were attached to the chassis, for example?

fallbalance · 22nd October 2009, 03:10 PM

Any help with this?

I'm also not sure which leads to connect to what... one side goes to my 2 power transformers on grey cord, and the other goes to a circuit board on a blue wire. The original wire doesn't help because it was there were no distinctions between either side of the plug...

jaycee · 22nd October 2009, 06:00 PM

Live (line, active, hot, whatever you call it) should be in line with the fuses inside the unit.

You may connect Earth (Ground) to the chassis but it may buzz. If it does you can either disconnect the earth and leave it disconnected, or (the correct thing to do) make a loop breaking circuit so that it wont buzz.

Juergen Knoop · 22nd October 2009, 06:09 PM

just replace the powercord with the same 'type' as the original one was.
Earthing things that never meant to be connected to protective earth is a desaster recipe in audio.
Regards

21st October 2009, 04:55 AM	#1
fallbalance diyAudio Member Join Date: Oct 2009	Power cord replacement - ground? I'm replacing the old power cord in my Yamaha M80 amplifier. The original cord has no ground, but my replacement does. What should I do with the ground lead? I could wire-nut it... orrr would it be put to better use if it were attached to the chassis, for example?

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22nd October 2009, 03:10 PM	#2
fallbalance diyAudio Member Join Date: Oct 2009	Any help with this? I'm also not sure which leads to connect to what... one side goes to my 2 power transformers on grey cord, and the other goes to a circuit board on a blue wire. The original wire doesn't help because it was there were no distinctions between either side of the plug...

22nd October 2009, 06:00 PM	#3
jaycee diyAudio Member Join Date: Apr 2004 Location: Norwich, UK	Live (line, active, hot, whatever you call it) should be in line with the fuses inside the unit. You may connect Earth (Ground) to the chassis but it may buzz. If it does you can either disconnect the earth and leave it disconnected, or (the correct thing to do) make a loop breaking circuit so that it wont buzz.

22nd October 2009, 06:09 PM	#4
Juergen Knoop diyAudio Member Join Date: Jan 2007 Blog Entries: 3	just replace the powercord with the same 'type' as the original one was. Earthing things that never meant to be connected to protective earth is a desaster recipe in audio. Regards

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