9 Apr
2008
9 Apr
'08
3:05 p.m.
On Wednesday 09 April 2008 17:19, Tony Duell wrote:
I've expected that too, in the past, and it hasn't been the case at least
sometiimes...
(Snip)
Hi,
I have an ICL PC2 CP/M box (like this:
http://www.old-computers.com/museum/computer.asp?c=752) which has a
faulty PSU, I am hoping someone here can advise me.
The PSU is a Farnell N100/F4190 SMPS, looks like a high quality unit
with nice screw terminals for mains in and DC out.
When fired up with 240V AC and a dummy load the output voltages are:
12V output=1.1V
5V output=2.3V
-12V output=-5.9V
The first thing that 'bothers' me is that the 12V output is lower than
the 5V one. If this was a simple regulation fault, I'd expect all outputs
to track. I think it's reasonable to asusme the chopper is
working (otherwise you'd
get no outputs at all). Does it seem to be running continuously, or do
you get the 'tweet tweet tweet' of a PSU that's starting, detecting a
fault, shutting down, and repearing?
Scoping tbings in there would sure be informative.
--
Member of the toughest, meanest, deadliest, most unrelenting -- and
ablest -- form of life in this section of space, ?a critter that can
be killed but can't be tamed. ?--Robert A. Heinlein, "The Puppet Masters"
-
Information is more dangerous than cannon to a society ruled by lies. --James
M Dakin