IBM 7133 D40 Service Manual page 98

Serial disk systems
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SRN
FRU List
33PAA
Not applicable
to
4252C
43PAA
Disk drive module (90%) ("Disk Drive
Modules and Dummy Disk Drive
Modules" on page 150).
SSA attachment (10%) (using-system
Installation and Service Guide).
44PAA
Disk drive module (100%) ("Disk Drive
Modules and Dummy Disk Drive
Modules" on page 150).
45PAA
Disk drive module (40%) ("Disk Drive
Modules and Dummy Disk Drive
Modules" on page 150).
SSA attachment (40%) (using-system
Installation and Service Guide).
External SSA cables, optical
extenders, or main fibre optic cables
(18%)
Frame assembly (2%) ("Frame
Assembly" on page 208).
80
7133 Models D40 and T40 Service Guide
Problem
Description: SRNs in this range are not enclosure
(subsystem) SRNs.
Action: For SRNs in this range, see the documentation for
your SSA attachment.
Description: An SSA device on the loop is preventing the
completion of the loop configuration.
Action: If the SSA service aids are available, run a link
verification, or physical view, service aid to determine which
device is preventing configuration (see the user or
maintenance information for your using-system SSA
attachment). The device that is preventing configuration is
the device that is beyond the last-configured device on an
open SSA loop.
If the SSA service aids or functions are not available, note
the value of PAA in this SRN, and go to "Physical Location
of a Device" on page 59.
Description: A disk drive module has a 'Failed' status.
Action: If the SSA service aids are available, run a link
verification, or physical view, service aid to find the failing
disk drive module (see the user or maintenance information
for your using-system SSA attachment). If no device is listed
with a status of "Failed", use the PAA part of the SRN to
determine which device is failing. Before you exchange the
failing device, run concurrent diagnostics to that device to
determine the cause of the problem. For information about
how to run concurrent diagnostics, see Concurrent
Diagnostics in the "Additional Information" appendix (in this
book) for your using system.
If the SSA service aids are not available, note the value of
PAA in this SRN, and go to "Physical Location of a Device"
on page 59. Exchange the failing FRU for a new FRU.
Description: The SSA attachment has detected an open
SSA loop.
Action: If the SSA service aids are available, run a link
verification, or physical view, service aid to determine which
part of the loop is failing (see the user or maintenance
information for your using-system SSA attachment).
If the SSA service aids or functions are not available, note
the value of PAA in this SRN, and go to "Physical Location
of a Device" on page 59. Then go to "SSA Link Errors" on
page 132 to solve the problem.

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