Slicing open the top of a 48T02 Sun Sparc chip to replace b - test-drb@ccmp.vtda.org

19 May 2001

...
  From:          Geoff Reed &lt;geoffr(a)zipcon.net&gt;

...
  I downloaded the datasheet for the 48t02's, i
think i may have a handful of
...
  32.768 xtals here so I'm looking ar chopping the
tops off the bad chips I
...
  have and taking protoboard and refitting them with a
new xtal and
 batteryholder package that can take a replacable lithium cell. :)  I
 sacrificed one yesterday to the great dremel in the sky to see how the top
...
  was put together... 

Your sound like serious ly damaging the top.  First you can locate the
battery with a small magnet as it's steel/nickel cased.  Then grind
down the the approximate center and do not grind metal away if you
can. then grind to the edges and pry old battery out.  I've done a few
of these and it's that simple.  Making it rocket science is unneeded.

FYI the top carries, diode, battery, crystal and two capacitors.

Allison