Yamaha M80 meltdown -- HELP!!!!

AD5GB · 29th March 2008, 06:53 PM

Greetings all,

I've had the Yamaha "stack" (M80, C80, T80, etc) since
the mid 80's and it's never failed to impress anyone, until recently. A tiny wisp of smoke and... silence.

Upon opening the amplifier I discovered that several of the smaller electrolytics leaked causing significant corrosion of component leads and the eventual failure. My problem is that some of the components are so scorched I cannot identify their values. There are also a couple small diodes (assuming zeners) that the leads appear to have completely dissolved.

Anyway I've searched all over the web and cannot turn up a single resource for a schematic or service manual for this amp and Yamaha tells me it's no longer available. Is there anyone here who might have one or know of a resource for one? I'd rather put this thing back in service instead of adding yet more parts to my "junk box" that will probably never be used.

Many thanks in advance!

Bigred · 30th March 2008, 12:43 AM

Yup, I have that SM and tried to email you but you don't except email through the forum. Most definitely worth repairing

EchoWars · 30th March 2008, 04:07 AM

You're not looking very hard...

http://www.vintageaudiomanuals.com/-XYZ-.htm
http://www.servicemanuals.net/result...133&model=M-80

I'm sure there's lots more, but those two are the first I found.

Jan Dupont · 30th March 2008, 04:52 AM

Here you got the M60 service manual free.
Yamaha M60
The M80 and M60 could be very simmilar

AD5GB · 30th March 2008, 09:47 PM

Greetings,

Gratitude to all who've responded!

Bigred: Not sure why you can't email me through the forum.... I thought that was enabled. But thanks for trying. I've tweaked a couple settings. Maybe now it will work

EchoWars: I have no idea how you were able to find these. Honestly, I've been Googling ( is that even a word???? ) for weeks and have found dead ends and non-responses from places that looked like they might help. Thank you!!!!!

ACD: Thanks for the link to the M60 PDF. It may actually contain all I need to get this thing back on line. Much appreciated.

Once again, many thanks to all!

Best

Bigred · 30th March 2008, 10:50 PM

The M-60 manual maybe enough to get it back up and running but the bias adjustments and such could be a little different in order to repair and set it up properly.

Juko · 28th June 2008, 07:16 AM

I have a C-80 schematic. You might want that too. Send me an email if you want it.

29th March 2008, 06:53 PM	#1
AD5GB diyAudio Member Join Date: Oct 2006	Yamaha M80 meltdown -- HELP!!!! Greetings all, I've had the Yamaha "stack" (M80, C80, T80, etc) since the mid 80's and it's never failed to impress anyone, until recently. A tiny wisp of smoke and... silence. Upon opening the amplifier I discovered that several of the smaller electrolytics leaked causing significant corrosion of component leads and the eventual failure. My problem is that some of the components are so scorched I cannot identify their values. There are also a couple small diodes (assuming zeners) that the leads appear to have completely dissolved. Anyway I've searched all over the web and cannot turn up a single resource for a schematic or service manual for this amp and Yamaha tells me it's no longer available. Is there anyone here who might have one or know of a resource for one? I'd rather put this thing back in service instead of adding yet more parts to my "junk box" that will probably never be used. Many thanks in advance!

30th March 2008, 04:52 AM	#4
Jan Dupont diyAudio Member Join Date: Apr 2003 Location: Copenhagen, Denmark	Here you got the M60 service manual free. Yamaha M60 The M80 and M60 could be very simmilar __________________ Free Schematic and Service Manual downloads www.audio-circuit.dk, Company: www.dupont-audio.com, Joint venture: www.DupontMantra.com

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30th March 2008, 12:43 AM	#2
Bigred diyAudio Member Join Date: Jul 2007	Yup, I have that SM and tried to email you but you don't except email through the forum. Most definitely worth repairing

30th March 2008, 04:07 AM	#3
EchoWars diyAudio Member Join Date: Dec 2002 Location: Left of the Dial	You're not looking very hard... http://www.vintageaudiomanuals.com/-XYZ-.htm http://www.servicemanuals.net/result...133&model=M-80 I'm sure there's lots more, but those two are the first I found.

30th March 2008, 09:47 PM	#5
AD5GB diyAudio Member Join Date: Oct 2006	Greetings, Gratitude to all who've responded! Bigred: Not sure why you can't email me through the forum.... I thought that was enabled. But thanks for trying. I've tweaked a couple settings. Maybe now it will work EchoWars: I have no idea how you were able to find these. Honestly, I've been Googling ( is that even a word???? ) for weeks and have found dead ends and non-responses from places that looked like they might help. Thank you!!!!! ACD: Thanks for the link to the M60 PDF. It may actually contain all I need to get this thing back on line. Much appreciated. Once again, many thanks to all! Best

30th March 2008, 10:50 PM	#6
Bigred diyAudio Member Join Date: Jul 2007	The M-60 manual maybe enough to get it back up and running but the bias adjustments and such could be a little different in order to repair and set it up properly.

28th June 2008, 07:16 AM	#7
Juko diyAudio Member Join Date: Jan 2007	I have a C-80 schematic. You might want that too. Send me an email if you want it.

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