10 Aug
2020
10 Aug
'20
2:31 p.m.
Hi All,
I'm going to be attempting to repair, both cosmetically and operationally, a
circuit board that had a strip of 12 volt trace "blown off" of it by a
short. The fiberglass is clean and there was no solder resist in the
affected area. I'm considering using 3M 1183 adhesive tinned foil tape for
the job. Has anyone else done this? Could you recommend this or another
product? Any tips?
Thanks,
Bill Sudbrink
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10 Aug
10 Aug
2:45 p.m.
On August 10, 2020 at 4:31 PM William Sudbrink via
cctalk <cctalk at classiccmp.org> wrote:
Hi All,
I'm going to be attempting to repair, both cosmetically and operationally, acircuit
board that had a strip of 12 volt trace "blown off" of it by ashort. The
fiberglass is clean and there was no solder resist in theaffected area. I'm
considering using 3M 1183 adhesive tinned foil tape forthe job. Has anyone else done this?
Could you recommend this or anotherproduct? Any tips?
I've never tried it, but maybe one of these pens that draws tracks with conductive
ink?
https://www.digikey.com/product-detail/en/chemtronics/CW2000/CW2000-ND/1929…
Will
3:04 p.m.
On 08/10/2020 04:31 PM, William Sudbrink via cctalk wrote:
Hi All,
I'm going to be attempting to repair, both cosmetically and operationally, a
circuit board that had a strip of 12 volt trace "blown off" of it by a
short. The fiberglass is clean and there was no solder resist in the
affected area. I'm considering using 3M 1183 adhesive tinned foil tape for
the job. Has anyone else done this? Could you recommend this or another
product? Any tips?
I usually repair these with solid copper wire, but then I'm
not trying to make it cosmetic, too.
Jon
5:57 p.m.
On 8/10/20 2:31 PM, William Sudbrink via cctalk wrote:
Hi All,
I'm going to be attempting to repair, both cosmetically and operationally, a
circuit board that had a strip of 12 volt trace "blown off" of it by a
short. The fiberglass is clean and there was no solder resist in the
affected area. I'm considering using 3M 1183 adhesive tinned foil tape for
the job. Has anyone else done this? Could you recommend this or another
product? Any tips?
I've used AWG30 wire-wrap wire to accomplish similar repairs.
--Chuck
12 Aug
12 Aug
3:33 p.m.
When I worked for Texas Instruments in '83, we used 30ga 24K gold
wire... I use plain wire-wrap wire for board repairs, and from the
looks of most of my pre-1990 circuit boards, that's period correct.
The only issue I'd have with that 3M tape would be cutting it narrow
enough to fit. Otherwise, it's purpose-built for what you're doing.
Doc
On 8/10/20 4:31 PM, William Sudbrink via cctech wrote:
Hi All,
I'm going to be attempting to repair, both cosmetically and operationally, a
circuit board that had a strip of 12 volt trace "blown off" of it by a
short. The fiberglass is clean and there was no solder resist in the
affected area. I'm considering using 3M 1183 adhesive tinned foil tape for
the job. Has anyone else done this? Could you recommend this or another
product? Any tips?
Thanks,
Bill Sudbrink
9:58 p.m.
How much current is ir suppose to carry? I'd just replace it with a piece of wire wrap
wire if it is less than an amp.
Of course, I assume you've fixed what ever failed to cause it to blow.
Gold wire is expensive.
Dwight
________________________________
From: cctalk <cctalk-bounces at classiccmp.org> on behalf of John Foust via cctalk
<cctalk at classiccmp.org>
Sent: Thursday, August 13, 2020 4:20 AM
To: cctalk at classiccmp.org <cctalk at classiccmp.org>
Subject: Re: Circuit board trace repair...
At 05:33 PM 8/12/2020, Doc Shipley via cctalk wrote:
When I worked for Texas Instruments in '83, we used
30ga 24K gold wire...
And these days, that's sold by the inch?
- John
10:25 p.m.
On 8/13/20 9:58 PM, dwight via cctalk wrote:
How much current is ir suppose to carry? I'd just
replace it with a piece of wire wrap wire if it is less than an amp.
Of course, I assume you've fixed what ever failed to cause it to blow.
Gold wire is expensive.
Dwight
According to my tables, AWG 30 copper wire has a resistance of 0.107 ohm
per foot or about 9 milliohm per inch. I suspect that it would work
under almost all PCB repair conditions. I've repaired power traces on
CPU boards using WW wire with no ill effects.
--Chuck
11:16 p.m.
Chuck Guzis via cctalk wrote:
On 8/13/20 9:58 PM, dwight via cctalk wrote:
Of course, it is not just about the resistance, but the resulting
thermal cycling at the endpoints... About 25 years ago, I learned the
hard way about keeping each amp across at least two DB-whatever pins in
experimental hybrid-electric vehicles.? Nowadays we routinely x-ray
crimps for safety-critical things such as ABS harnesses.?? Ampacity
calculations differ wildly accross applications.
carlos.
How much current is ir suppose to carry? I'd
just replace it with a piece of wire wrap wire if it is less than an amp.
Of course, I assume you've fixed what ever failed to cause it to blow.
Gold wire is expensive.
Dwight
According to my tables, AWG 30 copper wire has a resistance of 0.107 ohm
per foot or about 9 milliohm per inch. I suspect that it would work
under almost all PCB repair conditions. I've repaired power traces on
CPU boards using WW wire with no ill effects.
--Chuck
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