8 May
2012
8 May
'12
6:19 p.m.
Hi Gene :)
On Tue, 2012-05-08 at 11:13 -0400, gene heskett wrote:
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.
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 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