Products > Test Equipment
Test Equipment Anonymous (TEA) group therapy thread
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Vince:
ENOUGH TALKING !

Unless someone can tell me what my vintage IC's are, I have the regret to inform the audience that I will have to shut down this forum  !! :horse:

I don't know how to do that but I will pay BD to do it for me, I am sure he is capable of it, somehow. Just need to find the right stuff to bribe him with. Maybe a pack of floppies for his Apple laptop !  >:D  :-DD

mnementh:

--- Quote from: nixiefreqq on July 04, 2022, 09:57:47 pm ---
--- Quote from: mnementh on July 04, 2022, 02:53:24 pm ---
--- Quote from: tggzzz on July 04, 2022, 01:09:53 pm ---
--- Quote from: nixiefreqq on July 04, 2022, 12:14:17 pm ---y'all got me playing with my 54622d ..... and damn it.   those squishy switches under the crt were back to being a pain in ass.
...
finally tried larger rectangles of AL tape and it so far is 100% good.

--- End quote ---

Does anybody have any experience of using conductive repair pads like these?
https://www.ebay.co.uk/itm/254871615598
450pcs Conductive Pads Keypad Repair Kits 2mm-8mm Box For IR Remote Controller
Thickness of pads: various, between approx. 0.5mm

--- End quote ---


Actually, now that I think of it... I've never had this problem on over a dozen 546xxx scopes where I've serviced the panel; every one has come back 100%, even this most recent 54600A, which literally had spots eaten out of the PCBs...

Are you guys scrubbing both the PCB and the pads on the membrane with IPA? You have to, both front and back in order to get a reliable read.

I don't use Q-tips; I scrub both the membrane and the PCB with a cotton kitchen towel (fine short nap; terry loops will snag on solder joints and edges of PCB) soaked in IPA.

Trick with the membrane keypad is to hold the body of the button in one hand and scrub each one individually; this allows you to scrub the conductive pad pretty aggressively with the IPA/towel in the other hand.

I also scrub around the solder joints on that intermediary cable with IPA and a toothbrush; that area collects cruft due to the tape stuck over it and will make the scope misread as it scans the buttons. On assembly, just leave those solder joints bare, or if you're anal aboot such things, a fresh strip of Kapton tape over the solder joints. Also, it is important to loop that ribbon cable exactly the same as HP made it; if you fold it over itself you'll have poor read problems.

mnem
 :-BROKE

--- End quote ---

ok, mnem didn't like the use of aluminium tape over those carbon buttons in the 54622d switches.

so i went to michaels craft store and bought a book of silver leaf.  pulled out the aluminium rectangles and replaced them with silver leaf of the same size and shape.  used a cotton ball to push it down on the buttons. exercised all 6 switches a bunch of times and then pulled it apart for visual inspection.  looks good.  if anything the buttons now seem even more sensitive than with the aluminium tape. 

I expect that mnem will now advise a trip back to michaels for gold leaf.  ok.....silver tarnishes, but silver tarnish is highly conductive and should not be a problem.

will it fail eventually?  maybe.
--- End quote ---

It will become part of the gold-plating on the PCB after a while. Gold and silver seem to marry easily and happily, especially when there's even just a few angry pixies involved. As to what I would recommend... at this point, it's hard to say, since your carbon pads are now contaminated with so many things.  :-//

I would have recommended you try cleaning them again, this time with a cotton kitchen towel (the fine nappy kind, not terry cloth) wet with IPA. As I suggested earlier. ;)

mnem
This space FOR RENT.
Specmaster:

--- Quote from: mansaxel on July 04, 2022, 09:47:29 pm ---
--- Quote from: Specmaster on July 04, 2022, 06:57:42 pm ---
If companies also perceive that Android is a serious threat to their security, then let them issue iPhones / Blackberries to their staff. I have never known a company that actually expected their staff to provide a mobile phone, it was always a company asset and had to be handed back upon leaving their employment and strictly NO private calls were allowed.

--- End quote ---

Blackberry is dead.

in Sweden, people provide or get issued phones, depending on work. I've had an issued phone the last 26 or so years, and the restrictions on private calls have initially been different.  My stance was, that either $EMPLOYER swallows the bill, no questions asked, or I turn the phone off when I leave work for the day. It's worked out well.  Employer did not make a fuss.

With the phone being very much a infocentre for your complete life (and that's something you can't avoid, period.), the question is if you want your employer to own your phone. I chose to split work and private phones simply because of this. And I'm very much conscious what apps and which data that go on which phone, just because.

Today, one gets free minutes and SMS, in the entire EU, and a sensible blob of data. I get 25GiB a month on my private phone. Never run out.  My work phone gets unlimited data in Sweden and something like 100GiB in the EU. And free calls/SMS.

The US market of course is shat, and the UK will be too, but that's something you can thank the über-twit Rees-Mogg for.

Bottom line, you get a working phone or you lose. It's not nice, but that's where it is.  We chose to give our children second-hand iPhones that have been professionally refurbished, and that keeps cost at a reasonable level.

For computers, the curve isn't as steep. At least if you buy a sensible computer. My laptop is very old; a "Early 2015" 13" Retina MBP. It still runs a supported OS, and it works for my needs; but the battery is near-toast and the storage is full. Both can and will be dealt with this autumn. The work computer of course is newer, a 16" Intel MBP with large storage and barely a year old. Those muscles are needed for "Bad web sites turned into apps" like Teams and others.

--- End quote ---
Well, I think Blackberry was still around, it did die a few years ago but was brought back to life again and I think they have now as of Jan 4th 2022 ceased in the mobile world. Instead what they are doing is making their security available on any phone that is running Android 5 and higher. Android 5 was released to the world on Nov 4th 2014 and this a shining example of what I was saying earlier about manufacturers and APP developers should still be willing to support older O/S's. My current phone is a 2019 model, running Android 10 and is already suffering slow-downs despite having plenty of storage left and some apps requiring Android 11 or better.

This link provides more details and also a download link to a free trial of their security system for all your messages etc if it is deemed that you or your employer deems it to be vital. I used to have a company Blackberry phone, and it was reliable but had a dreadful UI. https://www.blackberry.com/us/en
bd139:

--- Quote from: Vince on July 04, 2022, 10:34:40 pm ---ENOUGH TALKING !

Unless someone can tell me what my vintage IC's are, I have the regret to inform the audience that I will have to shut down this forum  !! :horse:

I don't know how to do that but I will pay BD to do it for me, I am sure he is capable of it, somehow. Just need to find the right stuff to bribe him with. Maybe a pack of floppies for his Apple laptop !  >:D  :-DD

--- End quote ---

Don’t have to pay me. Especially not floppy disks :-DD.

They are Harris opamps. Lookup Harris HA-2525.

Edit: I was going to write a long reply to other posts but I will say I’ve read them and my eyes have stopped working now and I think everyone is tired of this line of conversation now. If we meet in person we’ll all have to get drunk and fight each other or something  :-DD
Zoli:

--- Quote from: BU508A on July 04, 2022, 09:40:48 pm ---
--- Quote from: Zoli on July 04, 2022, 03:22:02 pm ---Loctite 4851; stays flexible after curing, see attached datasheet. :-+ But the price :scared:

--- End quote ---

Looks like, this stuff isn't available anymore. At least to the private customer which needs only 20ml of it.

Are you aware of a replacement / successor of the Loctite 4851?

--- End quote ---
In NA is still available(random search: https://www.rshughes.com/p/Loctite-Prism-4851-Cyanoacrylate-Adhesive-20-G-Bottle-37732-IDH-524540/079340_37732/); I know, this isn't help. Try to contact Henkel/Loctite, and court out a sample bottle from the local rep ;)
What I do know, there is light(405nm) activated version, too, which I don't recommend, unless you will use it up completely before expire; once expired, is useless garbage(and I don't remember the part#, sorry).
Compare to: my bottle of 4851 expired 10/20, and is still usable; it doesn't has the original strength, but is still flexible, and react nicely with the accelerator.
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