On 11/27/2018 03:34 PM, Jeffrey S. Worley via cctalk wrote: > When I bought that Sparcstation 4/330 at Computer Parts Barn, the 48T02 > was one of the problems with it. The chip looks like a piggieback rom > encapsulated in epoxy. > > I was not reinventing the wheel at the time, I think, because it was > the year 2000 or so, but I looked for a replacement and found them hard > to come by. So, knowing the battery was most likely the fault, I went > about fixing that bit. > > The battery accounts for the high profile. You do not have to cut the > entire doggone batter off, the terminals are at one side, iirc, the > right-hand side if the notch is to your left. It is high on the epoxy, > so all you need do is cut down an eighth of an inch in that region, > just shave that top edge until you expose the battery terminals. I > forget how I determined the polarity of them, perhaps I plugged it into > the board after and tested the terminals for power, but all you do once > you've exposed the terminals is solder a power and a ground wire to > them and attach a 3volt battery. I used a pack with two AA's, in a > case so they are user-replaceable. They are probably STILL keeping > time in that machine, wherever DHS took it and my MEGA ST4 and DG > MV4000/dc... That's another story. > > So refurbishing these chips is a cakewalk, takes 15 minutes (the second > time 'round), and will work til' doomsday. > > Best regards, > > Jeff > I take a very simple approach:
All the ones I've ever purchased were bad out of the box (NOS parts), so much for china but they can be repaired too. After removing it from the board... I use a small magnet to locate the battery. I use a sharp wood chisel about .25 wide and carve the plastic down to the battery then get under one edge. Once metal is visible I clear the plastic and pop it out. The wires then are easy to locate and I mount using Hot-melt glue a new holder for the very common 2032. Never had to replace one of those and a few are pushing more than 12years. The whole mess takes less than a few minutes to do where access the board and getting it off the board are the bigger part of it. Since I have a few NOS (but dead) parts plus pulls from old CPU cards I rarely worry if the existing one gets damaged as I have spares. To me its not a big deal. Allison
