Electronics > Beginners

crying Newbie

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schmitt trigger:
I did open the link, and the following paragraph made me chuckle:

"1960s oscilloscope being cleaned in the shower and dried in a kitchen oven with the missus out on a shopping excursion." Italics mine.

It made me chuckle because that is what I have done some electronics mischief in the past.  ;D

But back to the OP's problem:
-Indeed, an insurance claim would be the best solution.
-If no insurance claim is feasible, the following approach has worked for me a couple of times:
1) Drench the soaked instrument in deionized water. Let it settle for a while.
2) Drench the instrument in alcohol. Isopropil is fine, but I like denatured 96% Ethyl better, I know it has great water affinity.
3) Let it dry 24 hours.

ogden:

--- Quote from: tggzzz on September 20, 2018, 01:34:12 pm ---Since you chose to omit the inconvenient-to-you context, I'll point out you "missed"

* the picture of the transistorised 7000 series scope being washed
* the text stating "A photo of Charles (Chuck) cheerfully washing a Tek 7000 scope back in 1972 has survived"
That doesn't fit with your statement "Pay close attention to vacuum tube type instruments" (your emphasis).

--- End quote ---

What statement? - It is citation from that article! Did you even read it?  :palm:

Tek 7000 scope indeed have vacuum tube inside: CRT. RTFWikipedia: https://en.wikipedia.org/wiki/Cathode_ray_tube

I am curious - what you want to prove? That you can wash modern electronics using pressure washer just because it worked in year 1972 and tek 7000 scope survived?

BTW it's not even funny anymore

If you really did not get it, correction in red:


--- Quote from: ogden on September 20, 2018, 09:21:38 am ---2) “[the instruments] are easy to wash and no particular precautions, other than those applying to vacuum tube type instruments, need be observed“

Pay close attention to vacuum tube type instruments of sentence (citation) above

--- End quote ---

Brumby:
I have used ordinary tap water for bulk cleaning of an old TV chassis heavily contaminated with dust and dirt.  The trick is to not let that water evaporate on its own, but to rinse it off with something like isopropyl alcohol.

In my experience, there are 3 main considerations:
1. Removing contaminants
2. Allowing to dry - thoroughly. (I put my TV aside and forgot about it for 3-4 weeks).  As stated above, 2 days for enclosed equipment is way too short.
3. Checking for effects on switch mechanisms, grease and other susceptible mechanical parts.

I remember the Serviceman column in EA once describing the repair of an electronic organ where some rodents had found their way inside via the foot pedal opening and, among other things, urinating over some PCBs.  The first stage of cleaning was to remove the affected boards and hose them down.  His argument: that the water would be far less damaging than the urine.  I forget if there was a rinse of something like isopropyl alcohol - but I do remember there was a long period given for drying ... and that was on PCBs removed from the unit.


Even if you do aim to get everything dried out - how much time will it take you?  Even if successful, you may still be faced with calibration issues and/or latent problems that may lie dormant and come back to bite you in the arse somewhere down the track.

Cerebus:

--- Quote from: ogden on September 20, 2018, 07:42:33 am ---
--- Quote from: 001 on September 20, 2018, 07:18:30 am ---
--- Quote from: ogden on September 20, 2018, 06:13:40 am ---
They missed to tell other "simple" things: old dishwasher is fed with deionised water that comes out of reverse osmosis filtration system. Then for sure they have ultrasonic and alcohol baths for "final rinse" and quick dry.


--- End quote ---

Pease is a autor of a famous book "The Art of Electronics". He write about his own positive experiece with Calgonit tablets and his common dishwasher at his home

--- End quote ---

Yes I know who he is or to be exact - was. Are you sure his chemistry was as good as his electronics?

Calgonit contains Sodium citrate and Carbonic acid. It's pH is 10. If he would wrote in the book that jumping off the cliff is good for your PCB's - you would do that? Sometimes you shall use your head or just check what electronics industry is actually doing.

--- End quote ---

Hmm. Who to believe, a dead jolly old man, quick to help, with a worldwide reputation in electronics, called on to consult by all sorts of people or a grumpy old man with a reputation for being acerbic and ungrammatical on electronics fora? Hmmm, so difficult to decide.

Na, not really. I'd side with old Bob. Especially as he used to take stuff from his dishwasher and actually measure it in rigs where he was looking to detect femtoamp level leakage currents. Like here. Kind of suggests it works, doesn't it?

mzzj:

--- Quote from: 001 on September 20, 2018, 07:18:30 am ---
--- Quote from: ogden on September 20, 2018, 06:13:40 am ---
They missed to tell other "simple" things: old dishwasher is fed with deionised water that comes out of reverse osmosis filtration system. Then for sure they have ultrasonic and alcohol baths for "final rinse" and quick dry.


--- End quote ---

Pease is a autor of a famous book "The Art of Electronics". He write about his own positive experiece with Calgonit tablets and his common dishwasher at his home

--- End quote ---
You get your authors mixed up. Pease is has nothing to do with AOE.
Troubleshooting analog circuits is one of his books:
https://www.amazon.com/Troubleshooting-Analog-Circuits-Design-Engineers/dp/0750694998

Also maybe a not best reference what is considered  safe practices today as he died on a car crash driving his 1969 VW beetle, allegedly without safety belts.  ;)

Actually I have washed dozens of "modern" boards with hot tap water and dishwasher soap.
(used pressurized air to dry, give a good rinse with IPA followed by another air blast and the board was ready for operation in 15 minutes, usually no need for oven dry..)

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