On 01/22/2017 10:57 AM, allison wrote:
I don't know about most people but this
solution has been around for
I locate the battery on the failed part with a small magnet, then
grind the epoxy down to it then pick it out with a sharp pointed
tool. Once I expose the connection point I older two wires then
epoxy a small coin-cell holder in that spot and it s done. I've done
this more times than I care to count and its effective and the
replacement battery some over 10 years old now have not failed. But
just in case I have a bag of NOS replacements (and pulls from
socketed boards) all with dead batteries from age. There is no magic
It's worth noting that the original post was about fabricating a
replacement using the DS12885A RTC chip. However, most old PCs used the
DS1285 RTC (inside of a DS1287 module). The DS12885A is supposed to be
drop-in compatible with the DS1285, but apparently, in some cases is not.
So there's logic in reworking the old DS1287 modules, as the DS1285 chip
is long out of production--you'll most likely have to be content with
pulls or the occasional NOS lot.
I haven't seen that version for a while. The later are fully
are epoxy filled.
Same for the MT48T part, same fix.
The problem with NOS parts is manufacture date. Some are really old.