Yamaha B-1 Power amp with UC-1 control

Lstuard · 11th March 2011, 03:39 PM

I have a B-1 power amp which just went into overload protection. It worked well ..then nothing. The C-1 still functions perfect. Can anyone suggest a repair center that can handle this unit? I only want a very good one.
Thanks!
Lee

cdfac · 11th March 2011, 08:09 PM

does it still go into protection when it's switched to an output with no speaker connected?

Lstuard · 11th March 2011, 08:27 PM

Yes it does. I switch it real quick to speaker 5 and turned it on. It went straight to protect mode.

djk · 12th March 2011, 08:11 AM

Inquire direct to Yamaha.

The B1 is difficult to work on, and parts may be un-obtainable. Yamaha has a set of card extenders to make it easier to service this amplifier.

QUADESL63 · 2nd May 2011, 08:46 PM

Hello Lstuard,
Refix a Yamaha B1 is not really easy and in my point of view only a meticulous tech can do it perfectly with the service manual complete.
To my knowledge , the only company who can do it here in France is Nagaoka.fr
try to contact them and they maybe abble to repair it . But in any case it will cost you a lot of money because original spares parts are difficult to find and they will probably not waste their stock .
Just try and keep us informed if you are successfull or not
QUADESL63

11th March 2011, 03:39 PM	#1
Lstuard diyAudio Member Join Date: Mar 2011	Yamaha B-1 Power amp with UC-1 control I have a B-1 power amp which just went into overload protection. It worked well ..then nothing. The C-1 still functions perfect. Can anyone suggest a repair center that can handle this unit? I only want a very good one. Thanks! Lee

12th March 2011, 08:11 AM	#4
djk diyAudio Member Join Date: Feb 2001 Location: USA	Inquire direct to Yamaha. The B1 is difficult to work on, and parts may be un-obtainable. Yamaha has a set of card extenders to make it easier to service this amplifier. __________________ Candidates for the Darwin Award should not read this author.

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11th March 2011, 08:09 PM	#2
cdfac diyAudio Member Join Date: Aug 2009 Location: Iowa City	does it still go into protection when it's switched to an output with no speaker connected?

11th March 2011, 08:27 PM	#3
Lstuard diyAudio Member Join Date: Mar 2011	Yes it does. I switch it real quick to speaker 5 and turned it on. It went straight to protect mode.

2nd May 2011, 08:46 PM	#5
QUADESL63 diyAudio Member Join Date: Dec 2004 Location: PARIS	Hello Lstuard, Refix a Yamaha B1 is not really easy and in my point of view only a meticulous tech can do it perfectly with the service manual complete. To my knowledge , the only company who can do it here in France is Nagaoka.fr try to contact them and they maybe abble to repair it . But in any case it will cost you a lot of money because original spares parts are difficult to find and they will probably not waste their stock . Just try and keep us informed if you are successfull or not QUADESL63

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