Yamaha 2010 - no sound

brijan.koldijk · 13th January 2010, 01:10 AM

I just picked up a Yamaha 2010 amp that powers up but will not put out any sound. Checked all fuses and circuits, all are fine. Switched speaker outputs, nothing. Any clues as to what the problem might be?

Iain McNeill · 13th January 2010, 02:50 AM

is there an input signal level indicator?

Next step involves lethal voltages. What tools do you have (scope, DVM, generators, loads)

If it's totally DOA then there's probably burnt bits inside. Can you post pics?

sakis · 13th January 2010, 11:47 AM

at this age its is almost a fact that this amp will need an extremelly good cleaning regarding pots and switches

beyond that, dirty trimmers and all electrolytic capacitors will need to be replaced ( against some peoples opinion this is also a fact )

after that and while replacing the above you will be able to :
repair any other damages that exist
upgrade some parts any way

here is a usefull link

vintage amplifier repair/upgrade manual

brijan.koldijk · 13th January 2010, 01:54 PM

Thanks Iain, I'll take some photo's and post tonight.

brijan.koldijk · 13th January 2010, 02:03 PM

Hi Sakis, thanks for your post. Very helpful. I've cleaned all switches but am not sure how to clean the ALPs pots as they are completely sealed. There does not appear to be any visually burnt components, but I am wondering if the speaker relays might be corroded and stuck. Apparently there was some distortion on the left channel, until the volume was turned up, then it cleared. The system has sat dormant for five years, now no sound. The next step might be taking it to a qualified tech with real testing capabilities. I still hope it may be something simple and within my capabilities.
Brian

djk · 14th January 2010, 12:22 PM

99% chance that the caps in the relay circuit are dried out.

Replace them.

13th January 2010, 01:10 AM	#1
brijan.koldijk diyAudio Member Join Date: Jan 2010	Yamaha 2010 - no sound I just picked up a Yamaha 2010 amp that powers up but will not put out any sound. Checked all fuses and circuits, all are fine. Switched speaker outputs, nothing. Any clues as to what the problem might be?

13th January 2010, 11:47 AM	#3
sakis diyAudio Member Join Date: Jan 2006 Location: nea makri athens greece	at this age its is almost a fact that this amp will need an extremelly good cleaning regarding pots and switches beyond that, dirty trimmers and all electrolytic capacitors will need to be replaced ( against some peoples opinion this is also a fact ) after that and while replacing the above you will be able to : repair any other damages that exist upgrade some parts any way here is a usefull link vintage amplifier repair/upgrade manual __________________ SERVICE ΙΑΠΩΝΙΚΩΝ ΜΗΧΑΝΗΜΑΤΩΝ ΗΧΟΥ www.eastelectronics.gr

14th January 2010, 12:22 PM	#6
djk diyAudio Member Join Date: Feb 2001 Location: USA	99% chance that the caps in the relay circuit are dried out. Replace them. __________________ Candidates for the Darwin Award should not read this author.

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13th January 2010, 02:50 AM	#2
Iain McNeill diyAudio Moderator Join Date: Oct 2007 Location: Santa Cruz, California	is there an input signal level indicator? Next step involves lethal voltages. What tools do you have (scope, DVM, generators, loads) If it's totally DOA then there's probably burnt bits inside. Can you post pics?

13th January 2010, 01:54 PM	#4
brijan.koldijk diyAudio Member Join Date: Jan 2010	Thanks Iain, I'll take some photo's and post tonight.

13th January 2010, 02:03 PM	#5
brijan.koldijk diyAudio Member Join Date: Jan 2010	Hi Sakis, thanks for your post. Very helpful. I've cleaned all switches but am not sure how to clean the ALPs pots as they are completely sealed. There does not appear to be any visually burnt components, but I am wondering if the speaker relays might be corroded and stuck. Apparently there was some distortion on the left channel, until the volume was turned up, then it cleared. The system has sat dormant for five years, now no sound. The next step might be taking it to a qualified tech with real testing capabilities. I still hope it may be something simple and within my capabilities. Brian

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