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 Post subject: A great way to clean wafer switches
PostPosted: Apr Tue 25, 2017 12:49 am 
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I saw a video of a great way to clean the traces in a wafer rotary switch. A pencil eraser. Just rub as best you can and it shines it up very quickly. You may have to rotate the switch to get to all of it and be sure to blow out the bits of rubber but it does the trick. Afterward lube with Deoxit or similar.

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 Post subject: Re: A great way to clean wafer switches
PostPosted: Apr Tue 25, 2017 3:22 pm 
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link?


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 Post subject: Re: A great way to clean wafer switches
PostPosted: May Mon 01, 2017 1:39 am 
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I fully concur with Michael. This has been my go-to wafer cleaning trick for years.
I buy those eraser slip-ons (the ones you buy to replace a worn down pencil eraser) and whittle them into
a sharp wedge shape which makes the process a lot easier. You will dirty an eraser with black yuck quickly so I also keep a piece of sandpaper handy to keep my eraser clean. One caution, though. You will get eraser debris in places you don't want it. What I usually do is finish the process with some high pressure air from an air compressor to clean out the wafer switch and then swab alcohol to take care of anything the eraser missed. Areas that you can't get to can usually be cleaned by whittling the eraser into a sharper point and holding it between a couple contacts while you rotate the wafer switch shaft.


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 Post subject: Re: A great way to clean wafer switches
PostPosted: May Tue 02, 2017 5:01 am 
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Large erasers were sold by Superex for cleaning tuner contacts 60 years ago.

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 Post subject: Re: A great way to clean wafer switches
PostPosted: May Tue 02, 2017 5:23 am 
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The problem is trying to get that eraser in between the wires and multiple wafers.

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 Post subject: Re: A great way to clean wafer switches
PostPosted: May Fri 05, 2017 4:02 am 
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I have always used the pencil type typewriter erasers for the last 50+ years. Hard to find now though.
They work fine, but as mentioned above, you have to blow out the debris.
You can remove the silver coating on the wafers if you get to "animal" with them though.
They were fantastic for getting deep into the old wafer & turret TV tuners to the tensioned spring contacts and the silver plated "bumps" on each turret strip.

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 Post subject: Re: A great way to clean wafer switches
PostPosted: May Wed 17, 2017 7:10 pm 
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As requested: https://www.youtube.com/watch?v=l-ve0Jk6bGc&spfreload=10

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 Post subject: Re: A great way to clean wafer switches
PostPosted: May Wed 17, 2017 8:00 pm 
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Location: Grand Chute, Wisconsin
Thanks for the link.

Now I can understand how it's done, but that method will only work on wide open switch assemblies.

There's no way to get into something like a crowded multilayer bandswitch with wires and components shooting off in all directions on an old radio with something as fat as a pencil.

.


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 Post subject: Re: A great way to clean wafer switches
PostPosted: May Fri 19, 2017 12:37 am 
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Image

Another method I found successful is to take a sliver of paper and roll into a stump like a paper tortillion used for pencil sketching, it is used to blend pencil marks into shadows. it is less abrasive the erasers,

http://www.dickblick.com/products/tortillons/#photos


I even just inserted a flat piece of paper under the contacts and pulled back and forth to polish those contacts. I have also used cramolin and a Q-Tip and toothpicks too.

In complete teardowns, we used liquid silver cleaner and used water to rinse then used isopropyl alcohol to absorb any leftover water.

And with each a Q-tip works also, just watch for stray cotton fibers. Patience is involved of course.

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 Post subject: Re: A great way to clean wafer switches
PostPosted: May Mon 29, 2017 2:45 am 
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Brasso & Q-tips, then alcohol & Q-tips.

Not as abrasive as an easer (no carving needed) & nail files :shock: Great for carbon track build-up.

While the *old goats* complain about the Brasso recipe being changed, it makes for a Good metal Prep.

Brasso, then Semi-Chrome polish work well together polishing chassises.

Made the backside metal of my Dynaco PAS-3X "shine like a Diamond in a goat's ass."

YMMV,
Lloyd
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 Post subject: Re: A great way to clean wafer switches
PostPosted: Jun Wed 21, 2017 10:30 pm 
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Location: Ironwood, MI
Lloyd, today you're my hero! After 20 or 25 years of cleaning wafer switches
with erasers I thought I'd give your technique a try on a Hammarlund HQ-180
(which seemingly has thousands of wafer switches). Brasso followed by alcohol
worked better than my old eraser technique and certainly better than everything
else I have tried. I blasted away any remaining Q-tip fuzz with my air compressor.
As I applied the Brasso, then alcohol, I exercized the switches to slosh it into
the contacts as well and it worked swell. It's my new "go to" method for cleaning
wafers.

Many thanks Lloyd.


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