3Com CS/2500, Руководство по установке

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5-14 C
HAPTER
5: M
AINTENANCE AND
U
PGRADES
Replacing EPROMs To replace EPROMs on the motherboard, follow this procedure:
1 Remove the cover, as described in “Removing the Cover” on page 5-6.
Make sure the server power is off and the power cord is unplugged.
The EPROMs are located on the right side of the motherboard (when
viewing the server from the front), as shown in Figure 5-5.
2 Gently lift the folded printer ribbon cable to access the EPROMs.
3 Note the orientation of the old EPROMs. The notched edge faces the
front of the server.
4 Note the location of each EPROM in order to replace it correctly.
Figure 5-5 shows the location of the EPROMs. The EPROM covering
address lines 0–7 is located in the left socket (when viewed from the
front of the server). The EPROM covering address lines 8–F is located
in the right socket.
5 Using a small slotted screwdriver or an EPROM-pulling tool, carefully
pry the old EPROM out of its socket, making sure not to bend the pins.
6 Place the old EPROM in the antistatic foam pad.
Keep the old EPROM until the server has been powered up and tested
with the new firmware. Refer to Appendix B, “Startup Messages.”
7 Remove the new EPROM from its antistatic foam shipping pad.
If the pins have been bent, carefully push the side of the EPROM against
a flat antistatic surface so that the pins are at right angles to the body
and fit easily into the sockets. Orient the new EPROM in the same way
as the old EPROM.
CAUTION: Failure to orient the EPROMs correctly will destroy them
when the server is powered on.
8 Being careful to line up the pins with the socket, firmly push the new
EPROM into its socket until it snaps into place.
CAUTION: Be sure that no pins are bent under the body of the
EPROM. Each pin must be inserted properly into its socket.
9 Replace the cover, as described in the next section.
CS2500BookFile : MaintenanceUpgrades Page 14 Thursday, December 11, 1997 10:44 AM