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Nope, Radu, a cable tie would require labor to install (“costs too much” in suit-speak).? Cheaper to glue it down.? I had a mechanical engineer coworker years ago with the nickname Elmer because he wanted to glue everything!? Ha!

Jim
> On Mar 3, 2025, at 1:31?PM, Razvan Popescu via <yo8ryr=[email protected]> wrote:
>
> ?Hi Radu,
>
> If you have a hot air desoldering station try to see if the heat will
> soften the glue/resin. Use low temp first and increase it slowly.
> Monitor the heat on the arm with an infrared thermometer in the same
> time not to melt the arm.
>
> Regards,
> Razvan
>
>> On 03/03/2025 22:17, Radu Bogdan Dicher via wrote:
>> Thank you, Mike.
>>
>> In terms of removing the arm from the switch stub (see pics enclosed a
>> few messages down), where HP decided to use this brown resin to glue
>> them together (completely unnecessary, in my opinion - how about a cable
>> tie or something easy to remove and replace?...), what would be some
>> recommendations in handling this? Specifically, safely and non-
>> destructively detaching the arm from the stub. The arm is marked:
>> "SPREAD JAWS TO INSTALL AND REMOVE," but due to the resin, that was just
>> about impossible upon my examination when doing this.
>>
>>? * Can anyone determine or have some educated guess regarding what sort
>>? ? of glue or resin that'd be? I tried seeing if I could scrape it or
>>? ? shatter it off, to no avail. It's tough and very hardened in place.
>>? ? Much harder than either of the two plastics it joins.
>>? * Solvents? I'd be pretty weary using liquid chemicals over the main
>>? ? board, but maybe something is recommended and safe to use in a
>>? ? situation like this.
>>? * What else would work? I assume others may have had this problem and
>>? ? came up with some good solutions.
>>
>> Thank you,
>> Radu.
>>
>> On Mon, Mar 3, 2025 at 8:32?AM Michael Bafaro via <http://
>> > <m.bafaro=[email protected]
>> <mailto:[email protected]>> wrote:
>>
>>? ? Radu,____
>>
>>? ? __ __
>>
>>? ? I wish you luck finding a replacement for the line filter and
>>? ? switch.____
>>
>>? ? __ __
>>
>>? ? Mike____
>>
>>? ? __ __
>>
>>? ? *From:*[email protected] <mailto:HP-Agilent-
>>? ? [email protected]> <HP-Agilent-Keysight-
>>? ? [email protected] <mailto:HP-Agilent-Keysight-
>>? ? [email protected]>> *On Behalf Of *Radu Bogdan Dicher via
>>? ? <>
>>? ? *Sent:* Monday, March 3, 2025 10:23 AM
>>? ? *To:* [email protected] <mailto:HP-Agilent-
>>? ? [email protected]>
>>? ? *Subject:* Re: [HP-Agilent-Keysight-equipment] HP 54512B (pair)
>>? ? repair____
>>
>>? ? __ __
>>
>>? ? Mike,____
>>
>>? ? This is unrelated with the issues I'm having with the -12V rail.
>>? ? When disassembling/reassembling the scope, the EMI Filter (more
>>? ? specifically, its built-in switch) and the HP arm/button broke
>>? ? apart. I can now either try to find replacements, or just
>>? ? replace the EMI Filter with a unit having the switch accessible from
>>? ? the back of the scope (this type is relatively easy to find) and
>>? ? disable the actuation of the front button. ____
>>
>>? ? Radu. ____
>>
>>? ? __ __
>>
>>? ? On Mon, Mar 3, 2025 at 8:16?AM Michael Bafaro via <http://
>>? ? > <m.bafaro=[email protected]
>>? ? <mailto:[email protected]>> wrote:____
>>
>>? ? ? ? Radu,____
>>
>>? ? ? ? ____
>>
>>? ? ? ? The pictures you sent appear to be the AC line filter (EMI) and
>>? ? ? ? the power switch and perhaps the line fuse.? If one of the
>>? ? ? ? supplies is off and the others are working, then the problem is
>>? ? ? ? somewhere else. ____
>>
>>? ? ? ? ____
>>
>>? ? ? ? The display is a standard magnetic deflected CRT.? I worked in
>>? ? ? ? that group years ago at Motorola.____
>>
>>? ? ? ? ____
>>
>>? ? ? ? Mike Bafaro ____
>>
>>? ? ? ? ____
>>
>>? ? ? ? *From:*[email protected] <mailto:HP-
>>? ? ? ? [email protected]> <HP-Agilent-Keysight-
>>? ? ? ? [email protected] <mailto:HP-Agilent-Keysight-
>>? ? ? ? [email protected]>> *On Behalf Of *Radu Bogdan Dicher via
>>? ? ? ? <>
>>? ? ? ? *Sent:* Sunday, March 2, 2025 7:14 PM
>>? ? ? ? *To:* [email protected] <mailto:HP-
>>? ? ? ? [email protected]>
>>? ? ? ? *Subject:* Re: [HP-Agilent-Keysight-equipment] HP 54512B (pair)
>>? ? ? ? repair____
>>
>>? ? ? ? ____
>>
>>? ? ? ? Two steps forward, one step back (one and a half?). ____
>>
>>? ? ? ? ____
>>
>>? ? ? ? While other things have been progressing, the power switch
>>? ? ? ? stopped working once I put most of the unit back together. I
>>? ? ? ? enclose some pictures, but it's a typical flip flop type where a
>>? ? ? ? pin prods and finds two different locations between the two
>>? ? ? ? states ON/OFF. I guess I can either look for a replacement (does
>>? ? ? ? anyone have one?), or try to repair it. Repairing something like
>>? ? ? ? this hasn't been something I've had a lot of luck with - if
>>? ? ? ? anyone has some good tips, I'll take them happily - and then
>>? ? ? ? there's also the way the longitudinal arm (actuating the
>>? ? ? ? pressing of the button on the front panel all the way to the
>>? ? ? ? back) is supposed to be handled. It seems to be glued with some
>>? ? ? ? hardened resin or something similar. In retrospect, though the
>>? ? ? ? SM doesn't mention this, I think the arm should be detached
>>? ? ? ? before removing the rear panel and moving it around. It puts too
>>? ? ? ? much pressure and torque on the switch to take this easily and
>>? ? ? ? not get damaged. ____
>>
>>? ? ? ? ____
>>
>>? ? ? ? Thank you for any pointers. ____
>>
>>? ? ? ? Radu. ____
>>
>>? ? ? ? ____
>>
>>? ? ? ? On Sun, Mar 2, 2025 at 3:20?PM Radu Bogdan Dicher via
>>? ? ? ? <> <vondicher=[email protected]
>>? ? ? ? <mailto:[email protected]>> wrote:____
>>
>>? ? ? ? ? ? Razvan,____
>>
>>? ? ? ? ? ? Thank you very much, this is very helpful. ____
>>
>>? ? ? ? ? ? I've managed to rig a load - I had a couple of 1ohm/10W
>>? ? ? ? ? ? Vishay RS10s (bulletproof, in my experience), and it looks
>>? ? ? ? ? ? like the -12V rail is MIA because of something going on in
>>? ? ? ? ? ? the PS. If I can confirm this, this would be great news (as
>>? ? ? ? ? ? opposed to tracking some failed tantalum decoupler or
>>? ? ? ? ? ? something else on the main board....). ____
>>
>>? ? ? ? ? ? Radu. ____
>>
>>? ? ? ? ? ? ____
>>
>>? ? ? ? ? ? On Sun, Mar 2, 2025 at 2:51?PM Razvan Popescu via
>>? ? ? ? ? ? <> <yo8ryr=[email protected]
>>? ? ? ? ? ? <mailto:[email protected]>> wrote:____
>>
>>? ? ? ? ? ? ? ? Hi Radu,
>>
>>? ? ? ? ? ? ? ? I think the PSU in all 545xx series was made by Boschert
>>? ? ? ? ? ? ? ? Inc. and
>>? ? ? ? ? ? ? ? someone already reverse engineered it. I attached the file.
>>
>>? ? ? ? ? ? ? ? I hope it helps.
>>
>>? ? ? ? ? ? ? ? Regards,
>>? ? ? ? ? ? ? ? Razvan
>>
>>? ? ? ? ? ? ? ? On 02/03/2025 23:33, Radu Bogdan Dicher via
>>? ? ? ? ? ? ? ? <> wrote:
>>? ? ? ? ? ? ? ? ?> Going back to my -12V rail issue, the SM advises
>>? ? ? ? ? ? ? ? loading the 5.20V rail
>>? ? ? ? ? ? ? ? ?> with a 2ohm/25W resistor. The only way I can put
>>? ? ? ? ? ? ? ? something similar
>>? ? ? ? ? ? ? ? ?> together with what I have at hand is using these
>>? ? ? ? ? ? ? ? dummy loads I am using
>>? ? ? ? ? ? ? ? ?> when repairing audio amplifiers, which are a pair of
>>? ? ? ? ? ? ? ? 8ohm/100W non-
>>? ? ? ? ? ? ? ? ?> inductive resistors. By paralleling them I can load
>>? ? ? ? ? ? ? ? the 5.20V rail with
>>? ? ? ? ? ? ? ? ?> a 4ohm resistor.
>>? ? ? ? ? ? ? ? ?> What are some thoughts regarding whether this would
>>? ? ? ? ? ? ? ? be a suitable load
>>? ? ? ? ? ? ? ? ?> for the PS? I think the PS just needs a low ohmic
>>? ? ? ? ? ? ? ? load of sufficient
>>? ? ? ? ? ? ? ? ?> dissipation capacity and it should crank itself up to
>>? ? ? ? ? ? ? ? nominal, but maybe
>>? ? ? ? ? ? ? ? ?> there's an aspect I'm overlooking.
>>? ? ? ? ? ? ? ? ?> Thank you,
>>? ? ? ? ? ? ? ? ?> Radu.
>>? ? ? ? ? ? ? ? ?>
>>? ? ? ? ? ? ? ? ?> On Sun, Mar 2, 2025 at 1:52?PM Radu Bogdan Dicher via
>>? ? ? ? ? ? ? ? <> <http://
>>? ? ? ? ? ? ? ? <http://%0b>> <>>
>>? ? ? ? ? ? ? ? <vondicher=[email protected]
>>? ? ? ? ? ? ? ? <mailto:[email protected]> <mailto:[email protected]
>>? ? ? ? ? ? ? ? <mailto:[email protected]>>>
>>? ? ? ? ? ? ? ? ?> wrote:
>>? ? ? ? ? ? ? ? ?>
>>? ? ? ? ? ? ? ? ?>? ? ?One of the two scopes is completely disassembled
>>? ? ? ? ? ? ? ? - head exploding
>>? ? ? ? ? ? ? ? ?>? ? ?emoji - and I have the old battery desoldered
>>? ? ? ? ? ? ? ? after confirming it's
>>? ? ? ? ? ? ? ? ?>? ? ?fully depleted.
>>? ? ? ? ? ? ? ? ?>
>>? ? ? ? ? ? ? ? ?>? ? ?I enclose pics with what I'm using for
>>? ? ? ? ? ? ? ? replacement. I probably would
>>? ? ? ? ? ? ? ? ?>? ? ?have been fine going with a 2032 type, but the
>>? ? ? ? ? ? ? ? 2430 I ended up
>>? ? ? ? ? ? ? ? ?>? ? ?fitting just right (maybe a bit snug), and the
>>? ? ? ? ? ? ? ? pins of the holder
>>? ? ? ? ? ? ? ? ?>? ? ?actually match the PCB eyelets. So all is good.
>>? ? ? ? ? ? ? ? ?>
>>? ? ? ? ? ? ? ? ?>? ? ?I couldn't figure out what exactly was the
>>? ? ? ? ? ? ? ? original battery model,
>>? ? ? ? ? ? ? ? ?>? ? ?as it's not legible even after removing the top
>>? ? ? ? ? ? ? ? tab, but its
>>? ? ? ? ? ? ? ? ?>? ? ?diameter is a bit over 23mm.
>>? ? ? ? ? ? ? ? ?>? ? ?I think this should work OK.
>>? ? ? ? ? ? ? ? ?>
>>? ? ? ? ? ? ? ? ?>? ? ?Back to the actual troubleshooting now!
>>? ? ? ? ? ? ? ? ?>? ? ?Radu.
>>? ? ? ? ? ? ? ? ?>
>>? ? ? ? ? ? ? ? ?>? ? ?On Fri, Feb 28, 2025 at 6:21?PM Roy J. Tellason,
>>? ? ? ? ? ? ? ? Sr. via <>
>>? ? ? ? ? ? ? ? ?>? ? ?< <>>
>>? ? ? ? ? ? ? ? <roy=[email protected]
>>? ? ? ? ? ? ? ? <mailto:[email protected]>
>>? ? ? ? ? ? ? ? ?>? ? ?<mailto:[email protected]
>>? ? ? ? ? ? ? ? <mailto:[email protected]>>> wrote:
>>? ? ? ? ? ? ? ? ?>
>>? ? ? ? ? ? ? ? ?>? ? ? ? ?On Thursday 27 February 2025 04:09:31 pm Radu
>>? ? ? ? ? ? ? ? Bogdan Dicher via
>>? ? ? ? ? ? ? ? ?> <> <
>>? ? ? ? ? ? ? ? <>> wrote:
>>? ? ? ? ? ? ? ? ?>? ? ? ? ? > One other unfortunate effect of the spot-
>>? ? ? ? ? ? ? ? welding of the top
>>? ? ? ? ? ? ? ? ?>? ? ? ? ?tab is that the
>>? ? ? ? ? ? ? ? ?>? ? ? ? ? > battery code is not visible. I can
>>? ? ? ? ? ? ? ? probably destroy the
>>? ? ? ? ? ? ? ? ?>? ? ? ? ?battery once out,
>>? ? ? ? ? ? ? ? ?>? ? ? ? ? > and read the CRxyzt battery code, but
>>? ? ? ? ? ? ? ? would anyone have good
>>? ? ? ? ? ? ? ? ?>? ? ? ? ?info offhand
>>? ? ? ? ? ? ? ? ?>? ? ? ? ? > on it?
>>? ? ? ? ? ? ? ? ?>
>>? ? ? ? ? ? ? ? ?>? ? ? ? ?You might find bits of this useful:
>>? ? ? ? ? ? ? ? ?>
>>? ? ? ? ? ? ? ? ?>
>>? ? ? ? ? ? ? ? <>
>>? ? ? ? ? ? ? ? <https://
>>? ? ? ? ? ? ? ? <https://%0b>>
>>? ? ? ? ? ? ? ? List_of_battery_sizes <
>>? ? ? ? ? ? ? ? List_of_battery_sizes>>
>>? ? ? ? ? ? ? ? ?>
>>? ? ? ? ? ? ? ? ?>? ? ? ? ?Scroll down to where they discuss coin and
>>? ? ? ? ? ? ? ? button cells:
>>? ? ? ? ? ? ? ? ?>
>>? ? ? ? ? ? ? ? ?>? ? ? ? ?"IEC designation numbers indicate the
>>? ? ? ? ? ? ? ? physical dimensions of the
>>? ? ? ? ? ? ? ? ?>? ? ? ? ?cylindrical cell. Cells less than one
>>? ? ? ? ? ? ? ? centimeter in height are
>>? ? ? ? ? ? ? ? ?>? ? ? ? ?assigned four-digit numbers, where the first
>>? ? ? ? ? ? ? ? two digits are the
>>? ? ? ? ? ? ? ? ?>? ? ? ? ?diameter in millimeters, while the last two
>>? ? ? ? ? ? ? ? digits are the
>>? ? ? ? ? ? ? ? ?>? ? ? ? ?height in tenths of millimeters. Taller cells
>>? ? ? ? ? ? ? ? are assigned five-
>>? ? ? ? ? ? ? ? ?>? ? ? ? ?digit numbers, where the first two digits are
>>? ? ? ? ? ? ? ? the diameter in
>>? ? ? ? ? ? ? ? ?>? ? ? ? ?millimeters, followed by the last three
>>? ? ? ? ? ? ? ? digits indicating the
>>? ? ? ? ? ? ? ? ?>? ? ? ? ?height in tenths of millimeters."
>>? ? ? ? ? ? ? ? ?>
>>? ? ? ? ? ? ? ? ?>? ? ? ? ?So the size of the battery will give you the
>>? ? ? ? ? ? ? ? info that you need.
>>? ? ? ? ? ? ? ? ?>
>>? ? ? ? ? ? ? ? ?>? ? ? ? ?--
>>? ? ? ? ? ? ? ? ?>? ? ? ? ?Member of the toughest, meanest, deadliest,
>>? ? ? ? ? ? ? ? most unrelenting -- and
>>? ? ? ? ? ? ? ? ?>? ? ? ? ?ablest -- form of life in this section of
>>? ? ? ? ? ? ? ? space,? a critter that can
>>? ? ? ? ? ? ? ? ?>? ? ? ? ?be killed but can't be tamed.? --Robert A.
>>? ? ? ? ? ? ? ? Heinlein, "The Puppet
>>? ? ? ? ? ? ? ? ?>? ? ? ? ?Masters"
>>? ? ? ? ? ? ? ? ?>? ? ? ? ?-
>>? ? ? ? ? ? ? ? ?>? ? ? ? ?Information is more dangerous than cannon to
>>? ? ? ? ? ? ? ? a society ruled by
>>? ? ? ? ? ? ? ? ?>? ? ? ? ?lies. --James
>>? ? ? ? ? ? ? ? ?>? ? ? ? ?M Dakin
>>? ? ? ? ? ? ? ? ?>
>>? ? ? ? ? ? ? ? ?>
>>? ? ? ? ? ? ? ? ?>
>>? ? ? ? ? ? ? ? ?>
>>? ? ? ? ? ? ? ? ?>
>>? ? ? ? ? ? ? ? ?>
>>
>>
>>
>>? ? ? ? ? ? ? ? ____
>>
>>? ? __
>>
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