6 Feb
2006
6 Feb
'06
3:54 p.m.
At 12:49 AM 2/6/2006 +0000, you wrote:
It is a very bad idea to 'run up' a swtich mode PSU (which this is) on a
Variac. SMPSUs appear as conatant power loads, as the input voltage
decreases, the current increases. Some supplies will blow their chopper
transistors under such conditions.
If you want to re-form the capacitors (and I don;t think it's necessary,
I've never had problems with capacitors in computer power supplies), take
them out of the circuit, and reform them using a bench supply and a resistor.
One thing I would recoemnd is that you check all the fans are running. If
not, either replace them or repair them (I do the latter...).
-tony
Hi List,
I have here a uVAX II in a ba23 box, most likely not powered up for 2 or=
3
years.
The innards are clean, no nasty smells, no other trace of prior problems.
Even so, to minimise the risk of damage I'm going to disconnect all the =
5v
&
12v leads, then attach some suitable dummy
load(s), switch on and wait f=
or
smoke.
Does this seem an appropriate plan? Can anyone point me to pinouts for t=
he
various supply leads from an H7864?
Does anyone have any other recommendations/experience of going though th=
is
process, and is there anything I've missed
that I should have included
above?
All wise precautions. Many others recommend also using a variac to bring =
up=20