Upgrading The Firmware - NEC 900i Installation And User Manual

Upgrading the Firmware

Use these instructions when upgrading the Firmware ROM in
your 900 or 900i Base Unit. The new ROM in your upgrade kit is
a static-sensitive component. Be sure to follow the instructions
below carefully. Failure to follow proper anti-static precautions
could damage your new firmware.
Removing Old Firmware EPROM:
1. Unplug the base unit from the line
cord.
2. Attach a grounded wrist strap to your
wrist and a grounded metal object
(such as CEU ground).
3. Remove the screws from the bottom of
the base unit and remove the cover.
4. Using an IC puller, carefully remove
the old Firmware ROM. Be careful not
to rock the ROM or bend the pins dur-
ing removal.
Installing New Firmware ROM:
1. Remove the new Firmware ROM from the anti-static sleeve.
2. Following the illustration at right,
carefully install the new ROM in
the base.
Pay careful attention to
line up the notch in the
ROM with the notch in its
socket. The notch should
be on the edge that
denotes pin "1".
Do not bend any pins
when plugging in the
ROM.
3. Discard the old ROM.
4. Replace the cover on the base
unit and reinstall the four screws.
5. Plug the line cord into the base
unit.
Installation
Grounded wrist
strap
1
Grounded wrist
strap
Key
1
1-11