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| Test Equipment Anonymous (TEA) group therapy thread |
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| Neper:
Here's my no longer secret weapon. A typewriter eraser. Flat enough that it will only erase in one line and harder than ordinary erasers. Great for cleaning PCB contacts and such like. The missing piece has broken out because it has become brittle over the years. It's certainly 50 years old. Had to take a photo as I couldn't find one online. [ Specified attachment is not available ] |
| BU508A:
While I was looking for some scopes on ebay, I stumbled over this abonimation abomination: https://www.ebay.com/itm/394152027065 :wtf: :scared: :-// |
| xrunner:
200 kHz BW? Yea what a POS. Should be at least 300 kHz for that price. :-DD --- Quote from: BU508A on July 09, 2022, 10:04:45 pm ---While I was looking for some scopes on ebay, I stumbled over this abonimation: https://www.ebay.com/itm/394152027065 :wtf: :scared: :-// --- End quote --- |
| bd139:
Oh great now I'm going to get nightmares tonight :-DD |
| mnementh:
--- Quote from: Zoli on July 09, 2022, 08:41:35 pm --- --- Quote from: mnementh on July 09, 2022, 05:49:21 pm --- --- Quote from: Zoli on July 09, 2022, 05:27:30 pm --- --- Quote from: mnementh on July 09, 2022, 05:05:55 pm ---The cure is to buff it down with very fine sandpaper (like 800-2000 grit); I use this fingernail buffing board. Yeah, I know it's pretty horrible looking; it's prolly older than my daughter. ;) --- End quote --- For silver tarnish removal an eraser does wonders, without removing any of the underlying silver. --- End quote --- You want to remove some of the silver, to remove the divot (wear crater) and make the contact flat again. As you can see in the pic, there's more than enough material to do this several times. This leaf spring is made of thin hardened brass, so pretty fragile; trying to rub it with a pencil eraser hard enough to remove anything is much more likely to mangle it than do any good. mnem :-/O --- End quote --- Case-by-case use; you don't want to use sandpaper on two flat surfaces, the chance to FUBAR is too big. --- End quote --- What are you talking about? Not on two surfaces; just one. The point is to make the contact flat again, as it's had a hole worn in it by the other contact which is a stamped metal chisel point. We're talking 0.10-0.20mm here. --- Quote from: Neper on July 09, 2022, 08:54:26 pm ---Here's my no longer secret weapon. A typewriter eraser. Flat enough that it will only erase in one line and harder than ordinary erasers. Great for cleaning PCB contacts and such like. The missing piece has broken out because it has become brittle over the years. It's certainly 50 years old. Had to take a photo as I couldn't find one online. --- End quote --- Your eraser would just tear the thing up. PCB is 100x more durable than these tiny paper-thin bits of spring brass. Y'all are operating under the assumption that it's just tarnish you're removing. You need to make the surface flat again otherwise it doesn't make reliable contact. I've tried cleaning switch contacts like these with Tarn-X followed by distilled water; that doesn't restore reliable contact. Refacing the switch does. This isn't the "PCB and fingers" type switches in a Tek attenuator... removing a little metal is perfectly harmless, and is in fact the correct way to fix the problem. mnem Next, all y'alls will be givin' me a rash of shit aboot boring out a engine to do a overhaul. |
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