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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

Hi Fabio I sent the picts in an email to you PM but comcast has changed there email to a new system so I'm not sure if you got it or not. Jim

Hello, Do not forget that scopes such as the 2215A and the 2235 have the fan drive circuitry you need already printed on the mainboard, but it is un-documented in the service manual. You just populate

One more possibility for the failures in the 2465x scopes.? The inrush thermistors are effective only when they are cold.? Turning off and immediately back on means there will be inrush current.?

Gentlemen Thank you all so much. I have learnt so much stuff about a subject about which I knew almost nothing. Important points: SMPS does not have inductive kick, therefore a capacitor across the

No idea about FET temperature, as I have no way to measure temperatures yet ! A thermocouple for my DMM and a simple IR "gun" are on my list of things to buy, but the thing is sooooo long, no idea

Ed makes a good point on AC power push-push switches. When they become sluggish it is a problem. Replace them if possible. Cleaning with IPA may help but may just contaminate the PCB. One thing that

Hi Vincent, I will wait for the proper parts, but after the test of the transformer I wanted some confirmation I was on the right track. Question: do you have an idea of the temperature of the FET in