From: No.Spam@No.Where.com   
      
   "Adamfarber"  wrote in message   
   news:Adamfarber.65c721d@audiobanter.com...   
   >   
   > 'Fred[_12_ Wrote:   
   >> ;911292']"Adamfarber"  wrote in   
   >> message news:Adamfarber.65bc95d@audiobanter.com...-   
   >> >   
   >> > David Nebenzahl;911263 Wrote:-   
   >> >> On 6/13/2010 12:56 PM Adamfarber spake thus:   
   >> >> --   
   >> >> > Hi Mark, I unhooked everything and hooked up a speaker to one of   
   >> the   
   >> >> > outputs and listened to FM and I still heard the him. Thanks,   
   >> Adam--   
   >> >>   
   >> >> The "him"?   
   >> >> Oh, you must mean the "hymn".   
   >> >>   
   >> >>   
   >> >> Whoops, meant HUM, thanks, Adam--   
   >>   
   >> Most likely a cap in one of the low voltage supplies has failed,   
   >> feeding unfiltered   
   >> DC to a regulator which cannot maintain smooth output voltage because   
   >> the input   
   >> is going to zero 120 times a second.   
   >>   
   >> You have to be a technician with troubleshooting skills, experience   
   >> with AV receivers,   
   >> test equipment and service information to fix this.  Assuming that's   
   >> not you, the unit   
   >> needs to go to a Yamaha warranty station for repair (Yamaha's warranty   
   >> stations have   
   >> access not just to service manuals but also to confidential service   
   >> bulletins, and more   
   >> importantly they have access to the technical staff at Yamaha, which is   
   >> the only really   
   >> competent technical staff in the business).  I can call Allen at   
   >> Yamaha, give him the   
   >> model number, and he'll tell me what the problem is and how to fix it   
   >> because he and his   
   >> staff know their equipment that well.   
   >>   
   >> Obviously, I work for a Yamaha warranty station.  That's the only   
   >> company we still do   
   >> warranty audio work for, because it's the only one with a staff that   
   >> knows a damn thing   
   >> about their product.  Well, them and McIntosh, but there are no Mac   
   >> dealers around here,   
   >> so they don't figure they need a warranty station here (Reno, NV).   
   >>   
   >> Fred   
   >>   
   >>   
   >> Hey Fred, thanks for the post. I am somewhat handy, if someone could   
   >> narrow down which part(s) may be suspect I will replace them so any   
   >> help you could give me would be GREAT!  Adam   
      
   I'll check the service manual & bulletins when I get back to work (I'm out with   
   the flu at the moment, and don't know for sure when that will be; sometime in   
   the next day or three) and see if I can give you any worth while advice.  Some   
   models are damn near impossible to take apart and get back together without   
   the manual.  There can be 20 or more cables that have to be unplugged and   
   then plugged back in to the right socket on the right board on reassembly, just   
   to get to the board(s) you need to work on.  I'm assuming you want to try a   
   shotgun approach and just replace every cap that could be causing the problem.   
   It'd take a 'scope to figure out what cap *is* the problem.   
      
   Watch this thread; I'll post again when I have some information for you.   
      
   Fred   
      
      
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