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Old switch cleaning

B

Bob Urz

Jan 1, 1970
0
I was going through a old sansui 20 year + old receiver for a customer
the other day and ran across the usual dirty switches. some i could take
apart and clean and burnish the surfaces. Thought i had it whipped when
it started to crap out a channel again. Turned out to be the
selector/tape monitor multi layer wafer switches. I trying the usual
suspects and could not get the crud off. Tried acetone, alcohol, PC
board degreaser, caig, and my old favorite GC red concentate (think its
long NLA). This crud would just not come off. I could get a Q tip
partially down into the open wafer switches. I decided to do something a
little radical. I dipped the Q tips in concentate, then dipped the Q
tips into some ajax scouring sink cleaner (not much mind you). With a
little scrubbing, the 20 year oxidation scrubbed off! I then washed it
off with spray degreaser. Let it dry then sprayed Caig pro gold on them.
It seemed to do the trick. I was a little hesitant to use the ajax, but
it did not seem to do any major damage.

Bob
 
M

Mark D. Zacharias

Jan 1, 1970
0
Bob said:
I was going through a old sansui 20 year + old receiver for a customer
the other day and ran across the usual dirty switches. some i could
take apart and clean and burnish the surfaces. Thought i had it whipped
when it started to crap out a channel again. Turned out to be the
selector/tape monitor multi layer wafer switches. I trying the usual
suspects and could not get the crud off. Tried acetone, alcohol, PC
board degreaser, caig, and my old favorite GC red concentate (think
its long NLA). This crud would just not come off. I could get a Q tip
partially down into the open wafer switches. I decided to do
something a little radical. I dipped the Q tips in concentate, then dipped
the Q
tips into some ajax scouring sink cleaner (not much mind you). With a
little scrubbing, the 20 year oxidation scrubbed off! I then washed it
off with spray degreaser. Let it dry then sprayed Caig pro gold on
them. It seemed to do the trick. I was a little hesitant to use the ajax,
but it did not seem to do any major damage.

Bob

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I have had amazing results using "nick-sanders" or "prep-pens" to clean
oxidation / tarnish off contacts. They are retractable pen-like devices
which have a stiff fiberglass brush. They can be found at auto parts stores.
Used with Caig De-Oxit, you wouldn't believe how new and shiny it makes
these old contacts - vcr mode switches etc. On wafer switches like yours
it's still difficult to get in there at 90 degrees for a proper cleaning
action, though. Taking the switch apart is sometimes an option.

I did a 9090DB the other day - the Dolby switch had come undone inside. The
holder for the center shaft was cracked and the shaft had travelled forward
out of the holder. What a job!

JB Weld to the rescue!

Mark Z.
 
G

GregS

Jan 1, 1970
0
I was going through a old sansui 20 year + old receiver for a customer
the other day and ran across the usual dirty switches. some i could take
apart and clean and burnish the surfaces. Thought i had it whipped when
it started to crap out a channel again. Turned out to be the
selector/tape monitor multi layer wafer switches. I trying the usual
suspects and could not get the crud off. Tried acetone, alcohol, PC
board degreaser, caig, and my old favorite GC red concentate (think its
long NLA). This crud would just not come off. I could get a Q tip
partially down into the open wafer switches. I decided to do something a
little radical. I dipped the Q tips in concentate, then dipped the Q
tips into some ajax scouring sink cleaner (not much mind you). With a
little scrubbing, the 20 year oxidation scrubbed off! I then washed it
off with spray degreaser. Let it dry then sprayed Caig pro gold on them.
It seemed to do the trick. I was a little hesitant to use the ajax, but
it did not seem to do any major damage.

Sometimes you need water. 50/50 alcohol water is pretty good. I use TarnX
for pieces you can get into. No scrubbing needed.

greg
 
J

Jason D.

Jan 1, 1970
0
If the contact pieces looks like tanished silver, use silver dip &
rinse off or polish it with bit of white heatsink grease & toothpick
then clean up throughly.

Cheers, Wizard
 
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