Hum or Buzz in Headphone Jack - Nakamichi

searchlight · 9th February 2011, 02:53 PM

I picked up a mint condition Nakamichi CD Player 3 in a Thrift that plays well. The only problem is that when I connect my Grado SR225 Headphones to the player's headphone jack, I hear a faint buzz in the background.

I do not have this problem with my other CD players.

I can adjust the volume of the headphone jack but I can still hear that annoying buzz in the background.

Is this normal behavior for the headphone jack of this CD player or does it have to do with the impedance of the headphones?

stephensank · 10th February 2011, 01:29 AM

The phones jack on the Nak should be dead quiet, even with highZ phones. Odds are that there is a loose ground between the headphone drive circuit & the main board, either bad solder joint or loose grounding screw somewhere.

searchlight · 10th February 2011, 05:23 AM

I solved the problem. I opened the case and found several wires touching the pcb of the headphone jack and its volume control. When I moved them away the noise disappeared.

I also moved this board's ground wire away from the main pcb, and used wire tubing to isolate all wires connecting headphone jack to the main pcb.

Now the jack is dead silent.

9th February 2011, 02:53 PM	#1
searchlight diyAudio Member Join Date: Dec 2010	Hum or Buzz in Headphone Jack - Nakamichi I picked up a mint condition Nakamichi CD Player 3 in a Thrift that plays well. The only problem is that when I connect my Grado SR225 Headphones to the player's headphone jack, I hear a faint buzz in the background. I do not have this problem with my other CD players. I can adjust the volume of the headphone jack but I can still hear that annoying buzz in the background. Is this normal behavior for the headphone jack of this CD player or does it have to do with the impedance of the headphones?

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10th February 2011, 01:29 AM	#2
stephensank diyAudio Member Join Date: Oct 2006	The phones jack on the Nak should be dead quiet, even with highZ phones. Odds are that there is a loose ground between the headphone drive circuit & the main board, either bad solder joint or loose grounding screw somewhere.

10th February 2011, 05:23 AM	#3
searchlight diyAudio Member Join Date: Dec 2010	I solved the problem. I opened the case and found several wires touching the pcb of the headphone jack and its volume control. When I moved them away the noise disappeared. I also moved this board's ground wire away from the main pcb, and used wire tubing to isolate all wires connecting headphone jack to the main pcb. Now the jack is dead silent.

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