Am 29.06.2005 um 03:32 schrieb Clark Martin:
At 11:48 PM +0000 6/28/05, Tim wrote:
Hi all -
I rescued an SE (1mb, 2 800k floppies) from the garbage man this
morning (literally, the garbage truck was just down the street when I
noticed the sad little box sitting at the curb between some garbage
bags and a very rusty lawn spreader).
<snip>
The corrosion doesn't look like it came from the board. More like
something spilled into it (while it was upside down) or a mild case
of flooding maybe.
I would just clean it with 90% Isopropyl Alcohol and a plastic brush.
If it takes out the battery then it was likely nearly dead.
I second that. IMHO the assumption something could have been spilled on
the SE's mainboard while it was upside down is striking at the first
moment, but a closer look at the pic reveals a trace of corrosion at
the top of a soldering spot on the far side of the SCSI connector,
which strongly endorses Clark's second explanation: " a mild case of
flooding". Go at it with mildly diluted isopropylic alcohol (I'd take
the popular 70%) and a soft toothbrush, rinse a couple of times with
the same and dry the biggest part of it off with a paper towel. No need
to let it get to the other side of the board, you can even avoid
letting the liquid get near the PRAM battery contacts on the solder
side. With 3 Volts there's no much life left in it, anyway, and as the
alcohol is diluted with demineralized water it is not conductive at
these low voltages, just as woodwynlane states, so it should not do
much harm as long as it isn't saturated with electrolytes from the goo
you're trying to get off the mobo. As an afterthought, after cleaning
the board, it might be a good idea to check what is left of the solder
on the most corroded connections and resolder them, if needed.
An aside to those who can afford the luxury to be "keepers": As long as
I don't desperately need to do it because I need a working clock etc, I
would not cut a soldered PRAM battery out and solder a battery holder
in the place. I have enough SE's, SE/30s and motherboards thereof with
factory-mounted batt holders to rig up a machine needed for work if I
want to, so I enjoy to keep some machines just the way they are,
including soldered PRAM batteries, as "time capsules" with their
original, albeit limited, capabilities: 20 MB Miniscribe, 1 MB RAM -
why not? They convey the way of working with an SE in, say, 1988 much
better than a maxed-out 128 MB, 2 GB HD SE/30 with an 040 accelerator
and a 24-bit colour graphics adapter in the PDS driving a 17" monitor.
Sure it's fun having the latter but it's not really "telling". Just my
2 Euro- Cents.
Cheers, OM
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