23 Apr
2023
23 Apr
'23
11:17 p.m.
On Sun, Apr 23, 2023, 3:56 PM W2HX via cctalk <cctalk(a)classiccmp.org> wrote:
I might be concerned about putting carbon comp
resistors in the dishwasher
as they are hygroscopic.
From an Ohmite datasheet:
https://www.mouser.com/datasheet/2/303/res_od_of_oa-180619.pdf
"Carbon composition resistors are highly hygroscopic and
changes in resistance value can occur if too much moisture is
absorbed. For this reason, it is recommended not to use water
or water-soluble solvents to clean these components. Alcohol
or hydrocarbon solvents are recommended for rinsing."
Years ago, I worked at a place that made their own boards in house. They
had a dishwasher for that. They had valve on it to disconnect the water
supply so they could fill it with alcohol or similar for special jobs.
Warner
73 Eugene W2HX
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-----Original Message-----
From: KenUnix via cctalk <cctalk(a)classiccmp.org>
Sent: Sunday, April 23, 2023 5:53 PM
To: General Discussion: On-Topic and Off-Topic Posts <
cctalk(a)classiccmp.org>
Cc: KenUnix <ken.unix.guy(a)gmail.com>
Subject: [cctalk] Re: flipchip cleaning and pin corrosion inhibition
Pete,
Did the 8E have core or solid state memory?
Ken
On Sun, Apr 23, 2023 at 4:06 PM Pete Turnbull via cctalk <
cctalk(a)classiccmp.org> wrote:
On 23/04/2023 17:54, Fritz Mueller via cctalk
wrote:
--
End of line
JOB TERMINATED Okey Dokey
I’ve been eying the dishwasher, for the subset of
flip chips that
that
are just DIP logic, carbon comp resistors, and ceramic bypass caps,
anyway. But I haven’t been brave enough to try that yet... Most of the
logic here has date codes to ’68 or ’69, so I’m inclined to treat it
gently. Any suggestions for approaches to clean this up?
I've used the dishwasher on a collection of PDP-8/E boards with success.
Avoid the hot drying cycle, and don't use a harsh dishwasher
detergent; some are quite caustic.
--
Pete
Pete Turnbull