Epson NX, Service Manual

Page: 74 / 154

Replacing Subassemblies
Removing the BIOS EPROMs
Follow these steps to remove the BIOS EPROM chips from sockets Ul and U113:
1
Remove the cover (see page 3-2) and any option cards that may be in the way (see
page 3-5).
Caution You must observe strict anti-static procedures to avoid
damaging the EPROMs as you install or remove them.
2 With a chip puller, lift each EPROM out of its socket and place it in an anti-static bag
for protection.
Replacing the BIOS EPROMs
Follow these steps to install the BIOS EPROM chips in sockets Ul and U113:
1 Remove the cover (see page 3-2) and any option cards that may be in the way (see
page 3-5).
2 Gently insert the System/VGA EPROM into socket Ul. Align the half-circle notch of
the chip with the notch of the socket to assure proper orientation (see Figure 3-16).
Figure 3-16 BIOS Chips Installation
3
Gently insert the SETUP Text EPROM into socket U113. Align the half-circle notch
of the chip with the notch of the socket to assure proper orientation (see Figure 3-16).
4
Replace the cover and any option cards removed
NX
Service 3-21