Re: Scope question

Rich Grise wrote:
> On Mon, 11 Apr 2005 22:51:05 -0700, Bill Bowden wrote:
>
> > I have an old scope I'll give away for the cost of shipping if you
are
> > interested. It's a single trace "Lab-volt AA792D" 15MHz I bought at
a
> > swap meet for $10. Worked well for a couple years, but now has an
> > attenuator problem. I tried tuner cleaner and WD-40
>
> Sorry, but if you got WD-40 in the contacts, it's all over. It's
> landfill, or maybe you could part it out.
>
> WD-40 is for door hinges and car front end squeaks. It's about the
> worst possible crap you can inflict on electronics. (other than,
> say, battery acid, of course.) When it dries, it turns to Cosmolene.
>
> The WD-40 can be cleaned out with acetone or MEK, but they're
> awfully hard on plastic parts, so that would just break something
> else. I don't know if it's possible to get TCE (trichlorethylene)
> or TCA (trichlorethane) - they're pretty benign solvents that will
> clean up WD-40. Maybe even isopropyl alcohol - but use 75% or
> better so that it dries properly.
>
> Sorry.
> Rich

Well, I think I used WD-40 on another scope attenuator last year and
it's still working well. I'm running a WD-40 experiment now on a old
intermittent 2500 ohm circuit board pot. I soaked the pot with WD-40
which eliminated the bad spots and the resistance changes very smoothly
now. The mechanical movement is also much easier. I'll check the
condition in 10 days and report the results.

-Bill

.

Loading