🚀 go-pugleaf

chao@chip.engr.sgi.com (Chia-Chi Chao) wrote:

>In article <43q6u8$dt5@itnews.sc.intel.com>,
>George I. Brisker <George_I_Brisker@ccm.sc.intel.com> wrote:
>>One of the power-supply connectors in the case was mis-wired. Instead of 
>>standard 5V-G-G-12V wiring, it had 12V-G-G-5V on one connector only. 
<SNIP>

<another SNIP> (I sure you've been following along well enough)
>the first thing I do is measuring ALL connectors with a voltmeter.  Better
>be more careful than frying thousands of dollars worth of computer equipment.
>-- 
>Chia-Chi Chao          chao@engr.sgi.com          Silicon Graphics, Inc.

I've resurrected a few old clunkers, and end up needing cases to put
them in. (can't leave them spread out on the bench) and have
encountered these situations (among others)

-cases quoted with 230w PS, but had 200w

-some really cheap 230w PSs have lower max Amp on 12v leg (say 26A to
29A) from the specs I've gathered (loosely) the 12v leg does the most
work, especially during startup. (my machine has a 230w --> 3HDs,
tape, 2 floppy, 2nd fan, 2 VLB + 3 ISA boards. I had to delay spinup
on the drives or it would "brown out" before the POST test.)

-one source I bought 4 cases from. 1 didn't work at all and 1 was
pumping AC to evrything! (made a real racket!) they were exchanged no
questions asked, but I did have to make 2 or 3 extra trips (plus the
potential damage). What I started noticing was these PSs had a second
warranty seal over the first (ie: rebuilt) plus side? less than $40
per unit.


I like the idea of testing with an old "door stop" like an MFM 20 or
40 megger. they draw more current as well.


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| Paul Gallivan   email to:                       |
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