Hi Gene :) On Tue, 2012-05-08 at 11:13 -0400, gene heskett wrote: > On Tuesday, May 08, 2012 10:32:50 AM Ralf Mardorf did opine: > > When I turned on my 7 year old Behringer > > > Using its age as a clue, I think I would be gong through it with a > "Capacitor Wizard" checking the caps in the psu in particular. I guess I already found the problem. On the primary side there are a 1u 50V and a 47u 25V capacitor, both 85°C. Thomas said I should replace them with > 100°C, even if they look ok. I've got capacitors on stock, but bad equipment for soldering. Unsolder already was hard, but I can't get it soldered, especially since the 47u I've got, has got a larger diameter, since it's a 35V. Reading glasses btw. are less good for soldering, I need to find a better tool to see when soldering. Thomas has got some special glasses. > I haven't a clue what it may be called on your side of the pond though, so > I will describe what it does in hopes it might be recognizable as a euro > made and named testing device. > > It is a small, low power oscillator, generating about 85 millivolts of rf > signal, at a nominal frequency of 100 kilohertz, the currant it can send > through a capacitor is presented on a meter, usually calibrated with a knob > so that it reads full scale when the probes are shorted together. Thomas has got Hameg oscilloscopes with component testers. Btw. the capacitors I unsoldered are broken now, even if they should have been ok before. Not because of heat, but to take hold of the capacitors damaged them. > Having a spare for that sort of thing is a good idea. Asking if it will > fail is like asking if freshly poured concrete will crack. The "if" is > wrong, the correct word is "when", because it will, always. :) I'm not a fan of switching power supplies. > Good luck Ralf. > > Cheers, Gene Thank you Gene, Thomas tries to visit me in some hours. Ralf _______________________________________________ Linux-audio-user mailing list Linux-audio-user@xxxxxxxxxxxxxxxxxxxx http://lists.linuxaudio.org/listinfo/linux-audio-user
