On Fri, 15 Aug 2008 12:30:37 -0700 (PDT), jrshedden
put finger to keyboard and composed:

Hi All,

I still enjoy this forum, even though I have to sift through the spam.
It's a real shame.

I have a Supermicro computer with a 'triple redundant' power supply.
That means 3x250 watt modules in a backplane and rated at 500 watts.
You can loose one module and still be in spec.

I lost a module, had it repaired under warrantee, and lost the the
same module again. It is an Ablecom Model SP 252-TC and I can find
nothing on it, including the card edge connector pinout. It looks very
well made and it I see quality components crammed inside. Supermicro P/
N is PWS-0035(M). Some research indicates it may have been made by
LiteOn.

The module will run for 30 seconds, then shut down for 20, then
repeat. An 'amp clamp' on the input shows about an amp when it's up,
and less than 100 mA when it's down, so I have to figure out why it
decides to give up and retry.

I could really use the edge card pinout of this type of supply and any
hints as to this type of symptom to save me reverse engineering time.
I'm thinking thermal, and if I can coax the supply into operation on
my bench, freeze spray will probably indicate the problem in short
order.

I am aware of proper safety procedures.

Thanks in advance!

Jim S.

All I could find were the ratings of the outputs:
http://www.supermicro.com/support/resources/pws/

The obvious thing to check when you suspect thermal problems is the
fan.

Otherwise, with the unit powered down, can you probe for continuity
between the backplane pins and known voltages on the motherboard (eg
PCI slot) and peripherals?

http://pinouts.ru/Slots/PCI_pinout.shtml
http://pinouts.ru/Slots/IndustrialPCI_pinout.shtml

I've never worked with a redundant, hot swappable PSU, so I don't know
if what I'm asking makes any sense.

- Franc Zabkar
--
Please remove one 'i' from my address when replying by email.