Technical information

4a. Hardware Removal and Replacement Procedures
This section lists the Field Replaceable Units (FRUs) and Distributor Replaceable Units (DRUs) in the PA-8500
Continuum Series 400 system and describes the removal and replacement procedures for each one. In some
instances, FRUs/DRUs are duplexed and may be removed and replaced without total removal of power, and thus,
without loss of continuous processing. However, in most instances, the system must be shut down and both main
power switches turned off prior to removal and replacement of the FRU/DRU. The list of FRUs/DRUs in the
following table notes which FRUs/DRUs require which degree of power removal before removal and replacement
procedures can be performed.
4.1 List of FRUs/DRUs
The following table lists the FRUs/DRUs in the PA-8500 Continuum Series 400 system and shows the location of
each FRU/DRU. It also indicates whether or not the FRU/DRU requires any degree of power removal.
FRU/DRU Location Power Removal Required
AC Power Chassis/Suitcase Cable
Assembly (AW-001038)
Mounted on Tray 1 rear and connects
suitcase power supply to AC power
chassis.
System must be shutdown and both
main power switches turned off.
Tray 1 (Power Front End Tray)
(AA-P28200)
Above the disk shelves and below
Tray 2.
System must be shutdown and both
main power switches turned off.
Tray 2 (PCI/ACU Power Tray)
(AA-P28300)
Above the disk shelves and Tray 1. System must be shutdown and both
main power switches turned off.
CPU Backplane (AA-E25800) Below PCI card cages. System must be shutdown and both
main power switches turned off.
PCI Backplane (AA-E26100) Below disk shelves. System must be shutdown and both
main power switches turned off.
Backplane Interconnect PCB
(AA-E26200)
Connects PCI backplane to CPU
backplane.
System must be shutdown and both
main power switches turned off.
PCI Fault Display PCB
(AA-E26600)
On top of PCI card cage. PCI power supply on the affected
side of cabinet must be turned off.
Cabinet Fault Display PCB
(AA-E26500)
On top of cabinet. System must be shutdown and both
main power switches turned off.
Disk Shelf (AA-D84000,
AA-D84001) (84000 is the disk
shelf with fans, SES and 48v DC
Power Supplies; AA-D84001 is
the empty disk shelf-used for
replacements)
Below power chassis. Cabinet must be shutdown and
both main power switches turned
off.
Hardware Removal Procedures
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