11 May
1999
11 May
'99
10:51 a.m.
Thanks to everyone who offered advice; something I was thinking
was to use warm water, and some dishwashing liquid. Does that
seem safe?
I used to use something similar when I worked for FLUKE-- we'd
use water with like a mild detergent. But then, these boards
were specifically manufactured to be cleaned this way.
I'll leave the corestacks alone (well, I'll use a soft brush to
remove the dust from the *outside* of the 'sandwich').
Thanks again, guys.
Jeff
On Tue, 11 May 1999 09:05:06 -0400 (EDT) allisonp(a)world.std.com writes:
deep
___________________________________________________________________
You don't need to buy Internet access to use free Internet e-mail.
Get completely free e-mail from Juno at http://www.juno.com/getjuno.html
or call Juno at (800) 654-JUNO [654-5866]
Allison keeps mentioning putting them in the
dishwasher...
I'm somewhat hesitant to do so. But she's had good luck
with doing it...
That kind of scares me also. I've had good luck with Mac's with a sink, mild detergent, and a rather large food
dryer.
The PDP-8f boards (except core and FP) were cleaned in the dish
washer.
All that needs to be done is put them in like plates and use the
standard
dishwasher soap remove before the dry cycle (too warm) and dry in a
160-170 degree Farenheight oven. A little air to get water from
under
chips is not a bad thing. High pressure air can be deadly as some
boards
may have jumpers and ECO wire that can easily be bown off with
120psi air!
Same for scrubbing as solvents like Isopropanal will swell some
plastics
used then and the tooth brush may remove part numbers you may later
need
to read.
Allison
11 May
11 May
11:54 a.m.
On Tue, 11 May 1999, Jeffrey l Kaneko wrote:
Thanks to everyone who offered advice; something I was
thinking
was to use warm water, and some dishwashing liquid. Does that
seem safe?
Maybe, maybe not, depends.
Why is it that most of the manufactueres used something like if not a real
dishwasher that every one is scared off here?
My experience is with more than several hundred s100, multibus, Qbus,
Omnibus and misc non-bus cards over 20 years of doing this it's never been
a problem other than to insure the water is completely dried off the
board. This does not include my expereince with marine equipment that has
had a swim in salt water (hint salt eats boards!).
I'll leave the corestacks alone (well, I'll
use a soft brush to
remove the dust from the *outside* of the 'sandwich').
The core stacks themselves if there were even a hint of something nasty
on them they'd get washed carefully, it's the fine wire I worry about.
Generally the sense and driver boards are ok to machine wash.
Allison
1:01 p.m.
At 04:54 PM 5/11/99 -0400, you wrote:
On Tue, 11 May 1999, Jeffrey l Kaneko wrote:
In fact, for the small runs of things we do at my business, we DO use
an old "portable" dish washer...
But the important thing to consider is: what was installed AFTER the
last aqueous board wash? For example, some older capacitors, and a
lot of old switches, pots, etc., could not be washed in such a manner,
as the water/detergent would find it's way inside these parts and
contaminate the "delicate bits" therein.
For "normal" hand-assembled boards (small runs) that get washed in
the old "Kenmore," we use a solder (and possibly a spray-on) flux
which includes its own "detergent." That way it becomes a cleaner
in the dish washer. We add nothing to the machine during the wash
except good, clean water.
You do need to be reasonably careful about getting "good" water
to the machine. With modern CMOS circuitry, the conductivity of
the trace minerals left on boards from "normal" house water can reduce
the resistance enough to cause failure of the board, where it would
have gone unnoticed on the older nmos / ttl boards.
Thanks to everyone who offered advice; something
I was thinking
was to use warm water, and some dishwashing liquid. Does that
seem safe?
Maybe, maybe not, depends.
Why is it that most of the manufactueres used something like if not a real
dishwasher that every one is scared off here?
My experience is with more than several hundred s100, multibus, Qbus,
Omnibus and misc non-bus cards over 20 years of doing this it's never been
a problem other than to insure the water is completely dried off the
board. This does not include my expereince with marine equipment that has
had a swim in salt water (hint salt eats boards!).
Gary
I'll leave the corestacks alone (well,
I'll use a soft brush to
remove the dust from the *outside* of the 'sandwich').
The core stacks themselves if there were even a hint of something nasty
on them they'd get washed carefully, it's the fine wire I worry about.
Generally the sense and driver boards are ok to machine wash.
Allison
2:31 p.m.
On Tue, 11 May 1999 allisonp(a)world.std.com wrote:
On Tue, 11 May 1999, Jeffrey l Kaneko wrote:
Good question! The only circuit cards that I would have any hesitation
about would be those with pots/trimpots and perhaps variable capacitors
installed. The possible problem there being getting them really dry.
- don
Thanks to everyone who offered advice; something
I was thinking
was to use warm water, and some dishwashing liquid. Does that
seem safe?
Maybe, maybe not, depends.
Why is it that most of the manufactueres used something like if not a real
dishwasher that every one is scared off here? My experience is with more than several hundred s100,
multibus, Qbus,
Omnibus and misc non-bus cards over 20 years of doing this it's never been
a problem other than to insure the water is completely dried off the
board. This does not include my expereince with marine equipment that has
had a swim in salt water (hint salt eats boards!).
I'll leave the corestacks alone (well,
I'll use a soft brush to
remove the dust from the *outside* of the 'sandwich').
The core stacks themselves if there were even a hint of something nasty
on them they'd get washed carefully, it's the fine wire I worry about.
Generally the sense and driver boards are ok to machine wash.
Allison
2:56 p.m.
allisonp(a)world.std.com wrote:
My experience is with more than several hundred s100, multibus, Qbus,
Omnibus and misc non-bus cards over 20 years of doing this it's never been
a problem other than to insure the water is completely dried off the
board.
There is an issue with relays and switches. At the last
place I was at, we had a number of field failures because
of water soluble contamination of these kinds of parts.
Dwight
5:24 p.m.
I had a Z-19 terminal that was sitting (fortunately turned off) underneath
a leaking saltwater pipe on a ship. I took out the boards, washed them
with distilled water (I don't remember if there was a dishwasher on the
ship!), and dried them. The terminal worked just fine.
Dave
allisonp(a)world.std.com wrote:
On Tue, 11 May 1999, Jeffrey l Kaneko wrote:
Thanks to everyone who offered advice; something
I was thinking
was to use warm water, and some dishwashing liquid. Does that
seem safe?
Maybe, maybe not, depends.
Why is it that most of the manufactueres used something like if not a real
dishwasher that every one is scared off here?
My experience is with more than several hundred s100, multibus, Qbus,
Omnibus and misc non-bus cards over 20 years of doing this it's never been
a problem other than to insure the water is completely dried off the
board. This does not include my expereince with marine equipment that has
had a swim in salt water (hint salt eats boards!).
I'll leave the corestacks alone (well,
I'll use a soft brush to
remove the dust from the *outside* of the 'sandwich').
The core stacks themselves if there were even a hint of something nasty
on them they'd get washed carefully, it's the fine wire I worry about.
Generally the sense and driver boards are ok to machine wash.
Allison
9199
days inactive
9199
days old
6 comments
7 participants
participants (7)
-
allisonp＠world.std.com -
cisin＠xenosoft.com -
djenner＠halcyon.com -
donm＠cts.com -
elvey＠hal.com -
go＠ao.com -
jeff.kaneko＠juno.com