Re: HP 54512B (pair) repair
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I'm a bit ashamed to admit that in such a case, I'd probably hot glue a battery holder that I already have in place of the original and connect its leads with a pair of short wires to the pads. If done with care and the battery well has a fully molded bottom (some are basically split in two by one of the contacts) so that it can be operated safely when fixed off-board it doesn't look that bad and functions properly.
Gabor
On Thu, Feb 27, 2025 at 9:48?PM Radu Bogdan Dicher via <vondicher= [email protected]> wrote: Awesome. Thank you guys! I only did just about enough prying to figure this mustn't be the right way to remove, then asked here. It sounds like it's not a ten minute deal and needs weekend time to do.?
If I understand this right, the correct procedure is to desolder both tabs?... Given the top tab is spot welded, it may not be reusable? So, replacing?this with the appropriate coin battery socket and a new battery is the way to go?
Thanks again! Radu.?
On Thu, Feb 27, 2025 at 12:09?PM Steve Hendrix via <SteveHx= [email protected]> wrote: On 2025-02-27 2:32 PM, Radu Bogdan Dicher via wrote:
> I lifted today the CRT card, just enough to have some access to the
> battery, but I'm still unsure how it's supposed to come off. I tried
> prying the top spring "leaf," but it seems attached (possibly
> soldered) to the battery - or is that a top lid over the battery? And
> then there's a piece of foam underneath, possibly double-sided
> sticking. I'd rather not remove the whole mainboard just to replace
> this, but I don't think I can try many more prying and pulling
> before?I risk something more serious due to the lack of access.
Stop prying! I've used that type battery many times. The tab on top is
spot-welded to the cell, with two fingers soldered thru the PCB.
underneath is another, smaller tab, with a single finger soldered thru
the PCB. You will need to gain access to the bottom side of the PCB to
desolder that.
Steve Hendrix
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