I have not worked on that particular supply. I found that on most of
the supplies that I have serviced, they had caps that failed or became
thermo sensitive.

What I can suggest to get an ESR meter and test all the caps. Heat the
module up with a heat gun so that it is warm when testing the caps.
All the caps that read too high in ESR should be changed.

If the fault is more complicated, the supply will be very difficult to
service without the schematics and a source for the proprietary parts.
In the modern supplies they use a lot of SMD technology with very
specialized IC's, custom made transformers and inductors and devices.

As for myself, I found that the majority of times these supplies are
not worth to service. You can end up spending many hours and a lot of
money on parts. In the end you may have a supply that you cannot have
some specialized parts you need and you spent a lot trying to fix it.


Jerry G.


__


On Aug 15, 3:30*pm, jrshedden wrote:
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.