On 01/22/2017 02:46 PM, Chuck Guzis wrote: > On 01/22/2017 10:57 AM, allison wrote: >> I don't know about most people but this solution has been around for >> decades. >> >> 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 >> to this. > 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. > > --Chuck
I haven't seen that version for a while. The later are fully versions are epoxy filled. Same for the MT48T part, same fix. The problem with NOS parts is manufacture date. Some are really old. Allison >
