bekim99 Posted April 5, 2009 Share Posted April 5, 2009 anyone know why the right channel is getting very hot very quickly??? sansui said check the bias, i have no clue what that is. the model is au999 i downloaded the manual and cant find the bias??? Quote Link to comment Share on other sites More sharing options...
pauln Posted April 5, 2009 Share Posted April 5, 2009 The bias is what uses the audio signal to control the passage of current in your channel outputs. If the bias is off its set point you may very well have too much current in the output. If the bias current is missing there is nothing controlling the output current and it would get hot fast... You should not operate the unit until you or someone else can check it out. Should check the bias for both channels and also check the DC offset for both. There may be some other parts that have failed or are no longer holding their specifications. On units like that there are usually some test points on the boards that look like little pins sticking up labeled "T1, T2...". The are connected to a volt ohm meter for reading. The actual bias adjustment usually looks like a little button with a slot in it to take a screwdriver blade (one for each channel). Like wise the DC off set is adjusted using a similiar little slotted button pair (the DC offset is the amount of DC going to your speakes when there is no signal - it should be adjusted so it is zero). The manual you have is the UserManual, the one you need is the Service Manual; it will have all the procedures for adjusting and tuning everything with step by step and diagrams. You can get a Service Manual at www.agtannenbaum.com or a number of other web sites. Some of the procedures will need to be done in order. If the procedures look too difficult or dangerous to you, have it done by someone experienced or a shop. You should also look around the web, there are Sansui forums that discuss these things and know all about how to keep them alive. Quote Link to comment Share on other sites More sharing options...
colterphoto1 Posted April 5, 2009 Share Posted April 5, 2009 My AU1100 does this and I've been advised not to use it at all until I can get it repaired. Quote Link to comment Share on other sites More sharing options...
DrWho Posted April 6, 2009 Share Posted April 6, 2009 anyone know why the right channel is getting very hot very quickly??? sansui said check the bias, i have no clue what that is. the model is au999 i downloaded the manual and cant find the bias??? Did they give you a service manual? Bias adjustment probably isn't in a normal users manual. Btw, same question for you Colter....and chance of finding a service manual? Quote Link to comment Share on other sites More sharing options...
colterphoto1 Posted April 6, 2009 Share Posted April 6, 2009 Yes I have the Service Manual- Marshal sent it to me. I'm on a waiting list for his preferred rebuilder. Bought this thing over a year ago and haven't been able to use it because of the overheating. M Quote Link to comment Share on other sites More sharing options...
bekim99 Posted April 6, 2009 Author Share Posted April 6, 2009 thank guys! the amp has been sittin in a box for years now, and theres no rush. My dad has owned since new and i thought id try to c whats up with it. Quote Link to comment Share on other sites More sharing options...
CIGARBUM Posted April 6, 2009 Share Posted April 6, 2009 Micheal, these are the two names that Marshal gave me for my 9900 and 7900. Warren - wbender@sbcglobal.net in Ohio Tim - tim@bristolnj.com in NJ CB Quote Link to comment Share on other sites More sharing options...
colterphoto1 Posted April 6, 2009 Share Posted April 6, 2009 I'm on Mr.Bender's 'waiting list'. Quote Link to comment Share on other sites More sharing options...
Kriton Posted April 6, 2009 Share Posted April 6, 2009 Dude - get ye to audio karma (www.audiokarma.com) exclusively Sansui thread (http://www.audiokarma.org/forums/forumdisplay.php?f=39) - and read 'Dc Offset and You" sticky - will tell you how to check DC offset and then search for your amp, and you will find the answer. If not, ask your question, and they will be all over that amp - very nice. B Quote Link to comment Share on other sites More sharing options...
Kriton Posted April 6, 2009 Share Posted April 6, 2009 Dude - get ye to audio karma (www.audiokarma.com) exclusively Sansui thread (http://www.audiokarma.org/forums/forumdisplay.php?f=39) - and read 'Dc Offset and You" sticky - will tell you how to checck DC offset and then search for your amp, and you will find the answer. If not, ask your question, and they will be all over that amp - very nice. B Quote Link to comment Share on other sites More sharing options...
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