Epson EL 486UC - Manual (Page 71)

8. If you removed the option card connector board, see
page 3-18 for instructions on replacing it. Then replace any
option cards you removed.
lnstalling a Heat Sink
If you are installing a 486DX2/50 or a 486DX2/66 processor,
you must install an EG&G heat sink (669-52AB) on the
processor chip. Follow the instructions above to install the
processor chip. Then follow these steps to install the heat sink:
1. Set the heat sink on top of the processor chip.
2. Place the retaining clip that came with the heat sink over
the corresponding notches in the heat sink, as shown below.
retaining clip
heat sink
microprocessor
3. Pull the edges of the retaining clip over the processor chip
until they secure the heat sink to the processor chip. You
may have to use a small flat-head screwdriver to do this.
3-28 Installing and Removing Options