Diskette Mode - IBM 3745 Series Service Functions

The modularity of the power supplies, the LlC/DMUX hot pluggability, allow con-
current repair per subsystem (CCU, MOSS), or per group of two adapters (TSS,
HPTSS, ESS, TRSS, CAl.
Repair Action in Case of Solid Error
Intermittent Error
No FRU Isolation
Diskette Mode
A failing FRU may be indicated by the following error information:
• Reference code resulting from the autober analysis or from an alarm
message.
• Reference codes given by the diagnostics on the operator console.
• Error codes given by the IMLlIPL checkout programs on the control panel's
hexadecimal display.
Any error indication points to a list of suspected FRUs and the replacement pro-
cedures are described in the 3745 MIP.
If an intermittent error is not confirmed by the diagnostics, the generated BER
is automatically analyzed (autober analysis), compressed as a reference code,
and included in an Alarm/Alert on threshold.
Errors not isolated by the maintenance package, and design errors on hard-
ware, microcode, or diagnostics, are handled:
• Remotely via URSF
• If required, by the support CE on site, or by the product engineer (PE).
If there is a solid failure on the MOSS disk
th~
3745 can continue to work in
degraded mode. This means that the IML must be done from the primary
back-up diskette, and that some functions are not available or are reduced. For
example, there is no BER recording, no diagnostics available (see "MOSS
Disk/Diskettes Organization" on page 11-2 for diskette contents).
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3745 Communication Controller