Help debugging a Sonus Faber Musica

ronenash · 4th March 2011, 07:33 PM

Hi all,

I need some help debugging a Sonus Faber Musica amplifier. I have the service manual (attached). I followed the instructions for setting DC offset and all worked fine. When I tried to set the quiescent voltage per the instruction on page 4, the left channel was not a problem and with the right channel no matter how much I turn the pot the voltage measired stays at 0mv.
The amplifier works and both channels play music although the right side of the heatsink where the output mosfets for the right channel are localted does not heat up as much under normal operation. I assume this is due to low bias current on that channel.

Can anyone assist in what could be the problem?

Service manual Musica (1).pdf - Windows Live

Thanks
ronenash.

giant haystacks · 29th June 2011, 12:25 PM

hi did you get your problem sorted out ,i am in n.ireland and our main hifi engineer is working on a sonus faber musica he may be able to help .
we are having trouble getting a schematic as surface mount resistors are damaged and absolute sounds the distributor wont help if you could help maybe we can help you in return

giant haystacks · 4th July 2011, 11:14 PM

hi could anyone advise how we could get a schematic as absolute sounds says return amp to them -maybe we could source a schematic from some other source -there are a few surface mount resistors damaged and we need a little help or maybe advice -i heard audio analogue may have had something to do with the production of the musica many thanks for now

gaetan8888 · 4th July 2011, 11:54 PM

Quote:

Originally Posted by ronenash

Hi all,

I need some help debugging a Sonus Faber Musica amplifier. I have the service manual (attached). I followed the instructions for setting DC offset and all worked fine. When I tried to set the quiescent voltage per the instruction on page 4, the left channel was not a problem and with the right channel no matter how much I turn the pot the voltage measired stays at 0mv.
The amplifier works and both channels play music although the right side of the heatsink where the output mosfets for the right channel are localted does not heat up as much under normal operation. I assume this is due to low bias current on that channel.

Can anyone assist in what could be the problem?

Service manual Musica (1).pdf - Windows Live

Thanks
ronenash.

Hello

Your service manual pdf file are not working, I've try to open it and there is an error message from my Adobe Reader.

Bye

Gaetan

giant haystacks · 17th July 2011, 07:57 PM

i still have had no luck getting the service manual -the amplifier is mostly fixed just the surface mount resistors to replace
maybe in the meantime i can put a few pictures up of the amp and internals and the board that needs resistors replaced
many thanks for now

4th March 2011, 07:33 PM	#1
ronenash diyAudio Member Join Date: Dec 2005 Location: israel	Help debugging a Sonus Faber Musica Hi all, I need some help debugging a Sonus Faber Musica amplifier. I have the service manual (attached). I followed the instructions for setting DC offset and all worked fine. When I tried to set the quiescent voltage per the instruction on page 4, the left channel was not a problem and with the right channel no matter how much I turn the pot the voltage measired stays at 0mv. The amplifier works and both channels play music although the right side of the heatsink where the output mosfets for the right channel are localted does not heat up as much under normal operation. I assume this is due to low bias current on that channel. Can anyone assist in what could be the problem? Service manual Musica (1).pdf - Windows Live Thanks ronenash. __________________ ronenash

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29th June 2011, 12:25 PM	#2
giant haystacks diyAudio Member Join Date: May 2011	hi did you get your problem sorted out ,i am in n.ireland and our main hifi engineer is working on a sonus faber musica he may be able to help . we are having trouble getting a schematic as surface mount resistors are damaged and absolute sounds the distributor wont help if you could help maybe we can help you in return

4th July 2011, 11:14 PM	#3
giant haystacks diyAudio Member Join Date: May 2011	hi could anyone advise how we could get a schematic as absolute sounds says return amp to them -maybe we could source a schematic from some other source -there are a few surface mount resistors damaged and we need a little help or maybe advice -i heard audio analogue may have had something to do with the production of the musica many thanks for now

17th July 2011, 07:57 PM	#5
giant haystacks diyAudio Member Join Date: May 2011	i still have had no luck getting the service manual -the amplifier is mostly fixed just the surface mount resistors to replace maybe in the meantime i can put a few pictures up of the amp and internals and the board that needs resistors replaced many thanks for now

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