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Got to kick this habit! I won a 1502 TDR machine for really not a lot of $. Was known non-working. The negative lead (from where the battery pack would have been if it had one) was black and crispy

http://w140.com/tekwiki/images/a/ad/Tek_545b_irb.pdf http://w140.com/tek_561_irb.pdf These PDFs were by made possible by Deane Kidd and his family and friends.

The various voltage combinations likely evolved to accommodate various fan types that were used over the years, and the actual cooling requirements. Some types may be marginal starting at reduced

Thanks for the 2236 schematics... indeed, yet another implementation ! LOL Tek just couldn't settle on something, seemed they were nevr happy with themselves ! ^^ It's still the same as all other

Hello, The recent discussion of various 22xx fan power supplies reminded me of an odd fan supply I saw awhile back, but I couldn't remember on what 22xx model it was. Some searching turned up this odd

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,