NAD 3150 repair

nukaidee · 31st August 2009, 06:26 PM

So, I had a NAD 3150.. unfortunately, I've never built a solid state, nor do I have the service manuals..

The problem: no sound in speakers / no speaker output in A or B

So far, I know its not the input, there is signal coming out of the rec out and the preout. If i put a line level into the "main in" where the preout is jumpered to, there is still no sound to the speakers. Can anyone advise on where to begin?

thanks!

Bigred · 1st September 2009, 03:48 AM

Well you have done some good basic troubleshooting thus far eliminating the preamp side of things. Is everything else with the amp normal such as passing protection with the speaker relay engaging?

nukaidee · 1st September 2009, 05:33 AM

I'm not sure I understand what you mean.. the "protection" light on the panel is on..

Bigred · 1st September 2009, 03:38 PM

The light on means its in "protection" and the speaker relay will not engage. When the amp is not going in to protection, the light is off and you should be able to hear a distinct "click" of the relay engaging after a few seconds or so after powering on. There is a fault in the amp section or the protection circuit itself.

I surmize that you have no experience with electronics and amp repair. I'm not a proponent of getting people with little to no experience poking around in an amplifier. My best advice at this point would be to have an experienced tech check the amp out for you.

nukaidee · 1st September 2009, 04:07 PM

If you can point me in the right direction I think I can handle it. I've built a simple se and various other electronics.. its just my first solid state experience. =)and yes, you're right, I don't hear the click... should've thought of that first. sounds like something is shorting?

31st August 2009, 06:26 PM	#1
nukaidee diyAudio Member Join Date: Nov 2008	NAD 3150 repair So, I had a NAD 3150.. unfortunately, I've never built a solid state, nor do I have the service manuals.. The problem: no sound in speakers / no speaker output in A or B So far, I know its not the input, there is signal coming out of the rec out and the preout. If i put a line level into the "main in" where the preout is jumpered to, there is still no sound to the speakers. Can anyone advise on where to begin? thanks!

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1st September 2009, 03:48 AM	#2
Bigred diyAudio Member Join Date: Jul 2007	Well you have done some good basic troubleshooting thus far eliminating the preamp side of things. Is everything else with the amp normal such as passing protection with the speaker relay engaging?

1st September 2009, 05:33 AM	#3
nukaidee diyAudio Member Join Date: Nov 2008	I'm not sure I understand what you mean.. the "protection" light on the panel is on..

1st September 2009, 03:38 PM	#4
Bigred diyAudio Member Join Date: Jul 2007	The light on means its in "protection" and the speaker relay will not engage. When the amp is not going in to protection, the light is off and you should be able to hear a distinct "click" of the relay engaging after a few seconds or so after powering on. There is a fault in the amp section or the protection circuit itself. I surmize that you have no experience with electronics and amp repair. I'm not a proponent of getting people with little to no experience poking around in an amplifier. My best advice at this point would be to have an experienced tech check the amp out for you.

1st September 2009, 04:07 PM	#5
nukaidee diyAudio Member Join Date: Nov 2008	If you can point me in the right direction I think I can handle it. I've built a simple se and various other electronics.. its just my first solid state experience. =)and yes, you're right, I don't hear the click... should've thought of that first. sounds like something is shorting?

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