[time-nuts] Re: Question about TSC5110

[Adrian Godwin]

These timekeeper devices were used in a number of HP products in the 90s,
typically digital scopes and the 53310A MDA. A later variant has the
battery in a removable piggyback part but those replaceable parts are also
proprietary so replacement is still a nuisance.

A number of people have tried to find a solution and there are rebuilds
with cion cells, hacked apart ICs with soldered on batteries, etc. Some of
the devices are battery-backed memory, some have clock/calendar chips etc.
and the replacement PCB option doesn't cover all the variants.

https://www.tindie.com/products/glitchwrks/gw-1386-1-8k-replacement-for-dallas-ds1386-module/
https://www.tindie.com/products/glitchwrks/gw-48t08-1-repair-board-module/
https://www.youtube.com/watch?v=svPNxILeQEw
https://www.youtube.com/watch?v=kZJDlNoJk7M
https://www.youtube.com/watch?v=DxjjtMWErw8




On Sun, Jun 16, 2024 at 12:13 AM Jim Schatzman via time-nuts <
time-nuts at lists.febo.com> wrote:

> Thanks for the suggestions!
>
> The RTC is an STMicroelectronics M48T86PC1 which is obsolete. They are
> available from various sources, but not Digikey and Mouser. I have ordered
> some. I just have never seem them before, so I wasn't looking for a large
> DIP package to contain a battery.  Live and learn.  I am interested to see
> if the batteries are good in the available "new" parts, since they are no
> longer made.
>
>
> At 04:21 PM 6/15/2024, Wilko Bulte wrote:
> >Have you tried swapping the coprocessor cards back? It could be as simple
> as re-seating the cards, which in essence is what happened during the swap.
> I think a swap-back is worth trying.
> >
> >As for the battery question: is there per chance a "fat"/ high DIL chip
> in there marked Dallas or ST (SGS/Thompson) ? Those ICs have Li batteries
> in their 'backpack'. Replacing a depleted battery requires swapping the
> entire chip. I think they are speced for 10 years or so but generally last
> longer (at least in equipment I saw them in).
> >
> >Wilko
> >
> >> On 15 Jun 2024, at 23:55, AC0XU (Jim) via time-nuts <
> time-nuts at lists.febo.com> wrote:
> >>
> >> I have several TSC5110s. One stopped working after a period of high
> temps in the lab.  It wouldn't complete the boot process - just displayed
> the spash screen, flashed off, then splash screen again. Power cycling gave
> the same result. Replacing the compact flash card didn't help.
> >>
> >> Swapping cards between two units one at a time, there were no changes
> in behavior until I swapped the co-processor card. Then both units started
> working!
> >>
> >> I am not sure what that is about. But I notice another thing - I can't
> change the date/time on either unit. I suspect the CMOS battery, but I
> can't find it. The CPU boards don't have the standard CR2032 or anything I
> recognize as a battery.  When I try to set the date/time, the units freeze
> up and have to be power-cycled.
> >>
> >> Anyone know how to locate the battery on these CPU boards?
> >>
> >> Also, any thoughts on why swapping the co-processor cards made both
> units start working?
> >>
> >> Thanks!
> >>
> >> Jim
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