FRP 5: Module Replacement
AC Repair and Adjustment Procedures
32
Cray Research/Silicon Graphics Proprietary
HMM-168-A
FRP 5: Module Replacement
This procedure applies to PEM and clock module replacement.
It is not necessary to remove power from the cabinet when you perform this
procedure. (However, it is a good safety practice to do so.)
NOTE:
Refer to FN 2290, CRAY T3E Module and Daughter Card Part
Number Reference, for current PEM, clock, and daughter-card part
numbers and for details on the following rules:
•
When you order a new PEM, compare the part number of the PEM
you removed to the reference chart in FN 2290 to determine the part
number that you should order.
•
Never install daughter cards of different memory size on the same
PEM.
•
Never place a PEM with an EV5.6 processor in a machine that has
been running only EV5 processors unless the module slots have
been checked for proper wiring and auxiliary voltage per FCO 3198.
If you are not sure whether the slots were checked, contact Technical
Support.
•
When ordering clock P/N 15108601, you must specify the
air-cooled or liquid-cooled type because of fanout differences.
•
If you move an I3/GR3 PEM into a slot that previously contained an
I4/GR4 PEM that was connected to a GigaRing channel, the system
may perform poorly or crash.
WARNING
Live voltage is present in the cabinet
during this procedure. Failure to avoid
live power components could result in
severe shock and burns.