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Thanks As you can see I a not a chemist. I will order some 95% formic acid soon. Glenn

Thanks As you can see I a not a chemist. I will order some 95% formic acid soon. Glenn

You don't necessarily have to have an air connection to the outside world for a fan. You can get some beneficial cooling by circulating the air inside the instrument, spreading the heat for

Just realized... stupid me ! ..... There is NO WAY one could fit a fan in a 2215 if like mine (and most units AIUI), it has the modified SMPS which replaced the TRIAC based regulator with the PWM /

Hmmm.... yes indeed ! Just looked at my 2215... no luck, as you said... :-/ At first glance I thought I stood a chance when I spotted C965 and CR965 (but no R965 and no fan connector) on the board

Formic acid is better than acetic -- it is more volatile than water or IPA so whatever left after the cleaning will simply evaporates without a trace. Don't use concentrated formic acid -- it has

Okay, I've found some additional evidence of what's gone wrong. Both R1300 and R1301 have exploded. I'm curious what I should try replacing and how I should turn the thing back on after the pieces

I use acetic acid (vinegar) to clean alkaline battery residue and baking soda in solution to clean acid battery residue. I have a wash bottle of both on the work bench. I follow this up by flooding

I use acetic acid (vinegar) to clean alkaline battery residue and baking soda in solution to clean acid battery residue. I have a wash bottle of both on the work bench. I follow this up by flooding

Did someone here suggest Ammonia (Ammonium Hydroxide solution, Washing Ammonia) as a way of removing the crud from failed alkaline battery corrosion? Dick

Hi Roy, As odd as it might sound, the 2215 is very unlike the 2215A (in many ways) and what is known about adding a simple cooling fan does not apply to the 2213 and 2215 as well as many of the other

BTW...have a read on this snubbing guide, especially concerning contact bounce which exists no matter how 'crisp' the switch action is. http://sound.whsites.net/articles/relays2.htm

On Sun, Aug 5, 2018 at 11:50 AM, Vincent Trouilliez wrote: > > On Sun, Aug 5, 2018 at 12:38 AM, satbeginner wrote: > > I had a quick look on the 2232 schematics > > The 2232 has a full wave rectifier

That's true for the early units, which drive the fan at 8.6V via the a middle tap and the two +/- 8.6 rails. But I see there was a different wiring for later 2232's : this time it's running at a

Hi Roy, It was Tom Jobe (which you quoted) who offered this info, not me ;-P I am interested in it too ! :-) As for posting Photos, I think it's much better to put them in a clearly/explicitly named,

Hello, I had a quick look on the 2232 schematics and my 2215A board layout: The 2232 has a full wave rectifier (CR965 & CR967 coming from pin 20 and 22 of the transformer) and a capacitor C965 and a

Hi, I for sure want to add a fan too! The album I made is open for the group, so you can simply add the pictures here: /g/TekScopes/album?id=64919 Un saludo, Leo

Tom, I recommend posting on groups.io George BTW, you owe me a lunch time visit...

Vincent, This is certainly a mod I want to do to my 2215. A modest amount of air improves the life of electronics a lot. I’d be grateful to get the pictures you have, with my thanks. Roy Morgan

As an aside....i had to snub a massive desulfator pulse of about 600A that delivered significant back emf from cable and battery inductance. I was unable to quantify it until I placed a pulse diode