Epson 4000 - Manual (Page 74)

Replacing the Processor Chip
You must remove the option card connector board to remove
your existing microprocessor. Refer to page 4-18 to remove the
option card connector board, then follow these steps to replace
the processor chip:
1. Use the illustration on page 4-5 to locate the microprocessor
on the system board. The microprocessor chip is inserted in
a ZIF (Zero Insertion Force) socket.
Caution
Make sure you ground yourself by touching the metal
surface on the inside of the computer’s back panel before
you touch the processor chip. Then remain as stationary
as possible while you install it. Do not touch the pins on
the processor chip. Handle the microprocessor only by
the edges of its case.
2. Open the ZIF socket by lifting up the ZIF handle. This
releases the chip from the socket. (If the existing
microprocessor has a heat sink that prevents the handle
from passing over it, you must remove the heat sink first.)
Caution
The 486SX/25 microprocessor may be soldered onto an
adapter board that is seated m the ZIF socket. Lifting the
ZIF handle releases the adapter board from the socket.
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.
Installing and Removing Options 4-27