Compaq AlphaServer ES45 Service Manual page 328

8. Remove the power harness bracket
latch to release the bracket, slide the bracket forward, and remove it.
9. Unplug the five connectors
10. Using a nut driver, loosen the three nuts
intermodule connector so that it can move freely. Move the flange up from
the connector and tighten one of the flange nuts to keep the flange out of the
way.
NOTE: After replacing the motherboard, loosen the flange nut and push the
flange down to the intermodule connector. Retighten the nuts on the
flange. While tightening the nuts, put pressure on the flange to com-
press it into the connector.
11. Remove the three Phillips screws
12. A white plastic ejector
to help disengage the motherboard. Insert a screwdriver through the hole
in the ejector into the closest hole and pry the system motherboard away
from the PCI backplane. Insert the screwdriver into the second hole that is
now exposed and pry again to fully disengage the system motherboard con-
nector from the PCI backplane.
13. Extract the system motherboard.
After installing a new motherboard:
1. Power up to the P00>>> prompt.
2. Enter the clear_error all command.
3. Enter the set sys_serial_num command to set the system serial number.
(The serial number is on a label on the back of the system.) For example:
P00>>> set sys_serial_num NI900100022
IMPORTANT: The system serial number must be set correctly. Compaq Ana-
lyze will not work with an incorrect serial number.
The serial number propagates to all FRU devices that have EEPROMs.
8-64 ES45 Service Guide
as follows: Push up on the spring
on the bottom of the system motherboard.
(7 mm) on the flange over the
that secure the system motherboard.
and two holes in the sheet metal under it are used