Yea! Glad it worked out for you. Thanks for following up with the happy ending.
73s, Greg KO6TH > To: ko6th_g...@hotmail.com; amsat-bb@amsat.org > Subject: RE: [amsat-bb] Help needed for my FT-736 > From: ab...@aol.com > Date: Mon, 14 Feb 2011 23:52:23 -0500 > > Greg, > Finally got to it. Regarding th AF amplifier, indeed, it was the "fuse" > 1/4W 1 ohm resistor open circuit. Looked for the email from the VK > fellow who had a similar problem and also suggested the "fuse" but > could not find it to give him the kudos, hopefully he'll read this post > with thanks to him as well. So I'm back in business, in the mean time > used an external AF amp as a work around but it's not the same. > Appreciated the suggestion, thanks. > 73 de AB4AB > Ben > > -----Original Message----- > From: Greg D. <ko6th_g...@hotmail.com> > To: ab4ab <ab...@aol.com>; amsat-bb <amsat-bb@amsat.org> > Sent: Thu, Sep 9, 2010 3:28 am > Subject: RE: [amsat-bb] Help needed for my FT-736 > > Hi Ben, > > I haven't looked at the schematic, but I'd be much more suspecting that > the cap has shorted out than the OpAmp. Replace it and the "fuse" and > see if that doesn't fix things. If so, you're lucky. Usually the $$$ > parts go first to save the $.000x ones. > > Greg KO6TH > > > > To: amsat-bb@amsat.org > > Date: Tue, 31 Aug 2010 18:19:44 -0400 > > From: ab...@aol.com > > Subject: [amsat-bb] Help needed for my FT-736 > > > > Hi, > > My FT-736 suddenly lost all audio (apart from the scanning beep). > Looks > > like the Q06 opamp in the AF Unit failed and shorted out the > 1Ω,1/4W > > resistor (fuse), 13.8V at the supply side, 2.4V at pin 5. Could > also be > > that the 2200μF cap. is shot. I can hear low level noise and > signals > > using an old AF amp. connected to the J02 AF in plug so the rest > of the > > rig incl. the TX appears fine. Any hints how to cure this sick > baby > > will be appreciated. Searched for a NEC μPC2002H replacement but > no > > joy. Found a possible solution at: > > http://diyaudioprojects.com/Chip/DIY-TDA2050-Hi-Fi-Chip-Amplifier > > where the data sheet includes a Single Supply Typical Application > > Circuit, Fig. 3 in the pdf file @: > > > http://diyaudioprojects.com/Chip/DIY-TDA2050-Hi-Fi-Chip-Amplifier/TDA2050-Datasheet.pdf. > > Any feedback is welcome, guess Yaesu does not carry any spare > boards or > > spare parts for this old rig. > > Thanks and 73 de AB4AB > > Ben > > > > > > _______________________________________________ > > Sent via AMSAT-BB@amsat.org. Opinions expressed are those of the > author. > > Not an AMSAT-NA member? Join now to support the amateur satellite > program! > > Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb > = > > _______________________________________________ Sent via AMSAT-BB@amsat.org. Opinions expressed are those of the author. Not an AMSAT-NA member? Join now to support the amateur satellite program! Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb
