26 Sep
2006
26 Sep
'06
7:10 p.m.
Hey Guys,
I have several PCBs that have damaged runs. The damage was done as a result of
dirt/moisture in contact with the boards while energized. I am going to fix the boards by
splicing a short piece of copper wire to the existing runs, bridging the section where the
run is broken. That's no problem.
In order to physically secure the patch to the board and protect the exposed copper from
corrosion, I need to apply some kinda coating / adhesive. What would you recommend? I
don't want to spray the whole board with lacquer or anything like that. Just the areas
where the copper is exposed. I was wondeing if something like fingernail polish would
work? Any suggestions?
Thanks, SteveRob
8:03 p.m.
I prefer to use epoxy, as that's what holds the board together already.
The only trick is to find a thin, quick setting brand so you don't make a
mess. Mix in small batches and apply quickly, discard what you have
mixed as soon as it starts to get tacky.
If applied quickly, while its still quite thin, its nearly undetectable.
----- Original Message -----
From: "Steve Robertson" <steerex at mindspring.com>
To: "'General Discussion: On-Topic Posts Only'" <cctech at
classiccmp.org>
Sent: Tuesday, September 26, 2006 7:10 PM
Subject: Fixing PCB runs
Hey Guys,
I have several PCBs that have damaged runs. The damage was done as a result
of dirt/moisture in contact with the boards while energized. I am going to
fix the boards by splicing a short piece of copper wire to the existing
runs, bridging the section where the run is broken. That's no problem.
In order to physically secure the patch to the board and protect the exposed
copper from corrosion, I need to apply some kinda coating / adhesive. What
would you recommend? I don't want to spray the whole board with lacquer or
anything like that. Just the areas where the copper is exposed. I was
wondeing if something like fingernail polish would work? Any suggestions?
Thanks, SteveRob
8:55 p.m.
On 9/26/2006 at 8:03 PM Bob Shannon wrote:
I prefer to use epoxy, as that's what holds the
board together already.
Not if you're like me--making "patches" that I later want to undo! Nail
polish is pretty neat stuff--if I'm working on a wirewrap project, I can
"tack" troublesome wires out of the way, yet easily free them if I need to.
When doing a wirewrap project, I'll take some red nail polish (pick your
shade) and mark pin 1 of all of the packages on the wiring side. Keeps me
honest--all those pins poking up at me makes it easy to lose my place.
I've thought about taking one of the other colors--such as green--and
marking the diagonally opposite corner of each package.
I suppose one could also tack a wire down with gel-type cyanoacrylate
(Super) glue, but I'd probably end up gluing my fingers to the PCB.
Cheers,
Chuck
9:14 p.m.
On 9/27/06, Chuck Guzis <cclist at sydex.com> wrote:
I suppose one could also tack a wire down with
gel-type cyanoacrylate
(Super) glue, but I'd probably end up gluing my fingers to the PCB.
We used to use a cyanoacrylate adhesive from Loctite specifically designed
for ECO repairs. It's much like super-glue gel, and was used with an
"accelerant" liquid you paint on the board first (all cyanoacrylate adhesives
are essentially liquid monomers that polymerize on application with the help
of ubiquitious traces of surface moisture - doesn't work so well at the South
Pole, though)
It wasn't exactly cheap, and I did glue my fingers to a board more than once,
but with practice, you learn how to lay it down in the smallest amounts
possible to get the job done.
-ethan
10:19 p.m.
On 9/26/06, Steve Robertson <steerex at mindspring.com> wrote:
Hey Guys,
I have several PCBs that have damaged runs. The damage was done as a
result of dirt/moisture in contact with the boards while energized. I am
going to fix the boards by splicing a short piece of copper wire to the
existing runs, bridging the section where the run is broken. That's no
problem.
This might not be the answer you want, but I usually solder a point-to-point
wire between two through holes of the sockets to fix the damaged runs. In
this case you only need to glue the wire secure.
vax, 9000
In order to physically secure the patch to the board and protect the exposed
copper from corrosion, I need to apply some kinda
coating / adhesive. What
would you recommend? I don't want to spray the whole board with lacquer or
anything like that. Just the areas where the copper is exposed. I was
wondeing if something like fingernail polish would work? Any suggestions?
Thanks, SteveRob
6457
days inactive
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days old
5 comments
5 participants
participants (5)
-
bshannon＠tiac.net -
cclist＠sydex.com -
ethan.dicks＠gmail.com -
steerex＠mindspring.com -
vax9000＠gmail.com