31 May
2007
31 May
'07
9:38 a.m.
Dan, that's fine advice. But a capacitor is just a
capacitor. They blow. No reason someone shouldn't
replace one if that'll get their computer back up and
running.
The Tandy 2000 used a funky p/s that was prone to, I
think, one particular cap blowing. What can you do?
You could jury rig another p/s in it's place. But when
mine went (in 1989) I looked at the schematic, and
went to Radio Shack, then went to work. And I had my
computer back.
I guess p/s problems could be some of the WORST
problems to a computer. You could fry a number of
chips (but this is uncommon). You could always effect
the repair, then run it under load for a few days or a
week and see how it's doing. Not everyone keeps or
even knows how to use test equipment, so sometimes you
just have to go with what you know. There's not too
many people these days that can or will work on this
stuff, so what can you do but your best.
--- Dan <ragooman at comcast.net> wrote:
One thing I always remember on power supplies is to
not take anything
for granted when it blows out-- regarding the
components health. It's
good to have a set of test equipment to check the
basics,
Transistor/Mosfet Checker, ESR tester, Milliohm
meter, Zener tester
besides just a DMM (a curve tracer is good to have
on the bench).
Whenever I'm inside a power supply, I think it's
important to take your
time and check it from head to toe--parts aren't
free-- and more parts
can blow out if you only replace the first part
that's bad.
=Dan
[ My Corner of Cyberspace
http://ragooman.home.comcast.net/ ]
Tony Duell wrote:
In which case you need practice in repairing them ;-)
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> Hi,
>
> >>....Repairing a switching power supply is one
the last
> >>things I would want to do.
> >
> > Why?
>
> Personally I've never had any luck repairing
switch mode PSUs
> either....obviously there's some hole in
my
understanding of them....
More seriously, there are easy faults with SMPSUs
and difficult faults.