27 Apr
2004
27 Apr
'04
9:18 p.m.
-----Original Message-----
From: cctalk-bounces(a)classiccmp.org
[mailto:cctalk-bounces@classiccmp.org] On Behalf Of Tony Duell
Sent: 27 April 2004 22:23
To: cctalk(a)classiccmp.org
Subject: Re: Mac IIfx update
Well, like I posted yesterday I've cleaned and dismantled the PSU and
verified it's not giving out any voltage at all. There's evidence of heat
damage on what looks like ballast resistors next to a relay that must be
triggered by the 5V ADB line to actually powerup the PSU, but I'd guess
those things get hot anyways.
There's a pic at http://www.wowrarelook.co.uk/DSCF6517.JPG. The cracking in
the post-assembly hot glue can be seen lower left of the pic. (I know that
doesn't help you, Tony :) The resistors are marked '5W 100ohm J MICRON 8DT'
and there's evidence of solder 'leakage' on the solder side of the board but
again I guess that's down to operational heat rather than excessive heat?
Cheers
--
Adrian/Witchy
Owner & Webmaster, Binary Dinosaurs
www.binarydinosaurs.co.uk - possibly the UK's biggest online computer museum
www.snakebiteandblack.co.uk - ex-monthly gothic shenanigans :o(
Heh, about time to try swapping in a known good
IIfx motherboard. ;)
Or actually fixing the problem properly by making some
measurements and finding what's failed rather than replacing
random parts until the fault goes away. As I've said before,
this is no way to fix anything, certainly not a computer! 