Hardware Reference 61
C613-03020-00 REV K
Replacing Boot EPROMs
All Rapier switches except the Rapier 48w have two 512 kByte boot EPROMs.
The boot EPROMs contain bootstrap code, which loads the main code from a
software release file in FLASH memory. In rare circumstances the boot
EPROM(s) may need to be changed.
Boot EPROMs should not need to be replaced, except in rare circumstances.
Contact your Authorised Allied Telesis distributor or reseller before replacing
any boot EPROMs.
To change the boot EPROMs
1. Check that you have the correct tools and equipment available.
You will need a medium-sized posidrive screwdriver and an EPROM
extraction tool (or a small flat-bladed screwdriver). In addition, adequate
antistatic precautions must be used.
EPROMs, like most electronic equipment, are highly sensitive to electrostatic
damage. This can be particularly acute in the dry atmosphere normally
associated with computer rooms and typical offices. Before commencing work,
ensure that you have used an approved antistatic wrist strap to discharge any
buildup of static electricity. Wear the strap at all times during the following
procedure.
2. Avoid injury by working in a safe environment.
The workspace should be free of hazards, and there should be sufficient
room to lay out the switch, the EPROM, and the tools.
3. Disconnect the mains power cord.
4. If fitted, disconnect the redundant power supply.
Do not take risks with mains or backup electricity. Do not attempt to remove
the lid of the switch unless all power cords have been disconnected from the
switch.
5. Remove the switch’s lid.
Using a posidrive screwdriver, remove the 12 screws that secure the
switch’s lid. There are 5 screws located in countersunk holes on each side
of the lid, and 2 screws at the rear. The switch may need to be removed
from any rack mounting system before its lid can be removed.
6. Remove the existing boot EPROMs.
The boot EPROM(s) should now be visible.
Figure 31 on page 62 shows the location of boot EPROMs on the CPU
board.
Remove the boot EPROMs using the extraction tool. Alternatively, a small
flat-bladed screwdriver can be used. If using a screwdriver, gently lever
each end of a particular boot EPROM a few millimetres at a time until it
comes free.
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