Products > Test Equipment
Repair of a Vintage Simpson 461-2 DMM
xrunner:
--- Quote from: lowimpedance on February 19, 2015, 12:23:15 am ---Must be some difficult 'Sh!t' to remove if none of what you tried made any impression at all!!.
what about ;
WD40, kerosine, mineral turps. Best to try a small spot first if the case is plastic.
Cant say if you will have any luck with those either, so maybe just live with the specks.
You should be looking at the display not the case anyway :P.
If you do get it off post back the magic liquid that did it.
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It's tough - part of the problem is that the surface is not all smooth. Most of it has a molded-in texture that is really making it hard to get to the "stuff". Most of the scrubbing is hitting the plastic while the stuff remains hiding in the crevices.
--- Quote ---Seems you have a bit of a thing for old multimeters !.
--- End quote ---
Yea it's fun to restore old stuff. And - this stuff is good especially those HP meters. NOT boat anchors.
--- Quote ---You know the HP3435a had a touch hold probe assembly similar to the Fluke 80T-H which is used with the 8010, 12 and 50 series.
The 34112a, (the small hole between the V/ohm and COM terminals is for this probe!).
If you want to add to your collection of oldies see if you can get a HP3476a/b, (that's one odd looking beast!).
--- End quote ---
Ah those little holes! I was wondering about those. I thought some jerk had drilled a little hole in the front panel, until I saw the other HP meter I got off Ebay had the same little hole. Thanks for solving that mystery! :clap:
--- Quote from: robrenz on February 19, 2015, 12:41:05 am ---Use a magic sponge with any of the cleaners above. It may take quite a bit of rubbing and I would be very careful on the printed info as it may take the print off also. You may also see if the individual specks will pop off with a soft plastic scraper. It looks a lot like house fly crap which is fairly hard to get off also.
--- End quote ---
I've heard of the magic sponge but never got one. Seems now is the time to try it out.
--- Quote from: Excavatoree on February 19, 2015, 01:08:30 am ---I've had good luck with "goop" brand hand cleaner, but sometimes it works very slowly. Apply, let set, wait, rub, wait, apply more, wait, rinse off, evaluate, apply more, rub, wait, apply more, and on and on
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Yea that's what I meant by orange degreaser - tried it and no effect.
--- Quote from: cosmicray on February 19, 2015, 01:23:54 am ---Can you scrape any of them with a fingernail ?
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Nope, wish I could. They are embedded in the texturing on the case plastic - it's not smooth. :--
--- Quote ---Alternate idea would be an old toothbrush with a bit of toothpaste. Toothpaste, depending on the brand, is a mild abrasive. Might try the baking soda and peroxide kind.
--- End quote ---
OK good idea. Will try that tomorrow.
lowimpedance:
--- Quote from: robrenz on February 19, 2015, 12:41:05 am ---It looks a lot like house fly crap which is fairly hard to get off also.
--- End quote ---
Now that would never have crossed my mind !.
Excavatoree:
--- Quote from: xrunner on February 19, 2015, 01:30:28 am ---
--- Quote from: Excavatoree on February 19, 2015, 01:08:30 am ---I've had good luck with "goop" brand hand cleaner, but sometimes it works very slowly. Apply, let set, wait, rub, wait, apply more, wait, rinse off, evaluate, apply more, rub, wait, apply more, and on and on
--- End quote ---
Yea that's what I meant by orange degreaser - tried it and no effect.
--- End quote ---
Just for the record, and it may help someone else, the old fashioned, plain white stuff works better than the "orange" formula. You'll probably find something that works better in this case, but the plain white goop works well for sharpie brand marker on Fluke yellow plastic.
xrunner:
Well ... I managed to get most of it off. And what did I use?
...
Mother's Mag wheel polish. :D
That was the only thing that would make a dent in it. I didn't get it all off but that's all I'm willing to do. So, the cabinet is now cleaned up - still waiting for LED parts.
xrunner:
Still waiting on parts but I ran into another problem traced to dirty switch contacts. If you need to know how to remove the innards from these types of banked switches for cleaning the trick is shown below. 8)
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