Epson EL 486UC - Manual (Page 70)

3. Gently pull the processor chip straight up and set it aside.
4. Remove the replacement chip from its package and inspect
the pins. If they are bent, do not install the processor chip.
Contact your vendor for a new microprocessor.
5. Position the processor chip over the socket, aligning the
notched edge of the chip (marked with a dot) with pin 1 on
the socket, as shown below. A corresponding notch is
drawn on the circuit board under the socket.
p i n 1
6. Make sure the pins in the processor chip are directly over the
holes in the socket. Then gently push the microprocessor
straight into the socket, pressing evenly on all sides.
7. See the table on page 3-25 to see if you need to install a heat
sink, replace the oscillator, or change jumper settings for
the microprocessor you are installing. Then follow the
appropriate instructions.
Installing and Removing Options 3-27