222 Troubleshooting the Tape Library
T024
T024 - AC Power Loss
Description GUI Description: AC power to a library power supply has been turned off.
Explanation: A power supply has detected loss of AC power. AC power loss
to a single power supply control module is unlikely to be able to post this RAS
ticket due to the speed at which system shutdown occurs after an AC loss.
This RAS ticket is most likely to occur when there is AC loss to a redundant
power supply in a control module or any supply in any expansion module.
Detection Scenarios AC power status from the supply creates an interrupt that is managed by
software.
Root Causes • AC supply is gone (cord removed, customer side AC failure, etc.).
• Individual on/off switch for the supply has been set to off.
• Hardware failure inside supply.
• Damaged module terminator or module-to-module cable with bent or broken
pins.
Service Resolution
Steps
1 Perform DR009 - Resolve AC Failure
on page 371.
2Use the Details option in the RAS ticket to identify which power supply is
generating the RAS ticket. Inspect the suspect power supply and verify that
there is a power supply present and turned on. For normal operation, both
LEDs (AC OK and DC OK) should be solid green. The STANDBY LED
should be off. Reseat the power supply and swap with others in the unit to
isolate failure to either the slot or the power supply.
3 Inspect the module terminators and module-to-module cables for loose
connectors or damage (bent or broken pins). If damaged, replace the part.
Reseat the terminators and cables.
Possible CRUs/FRUs Note: Read and perform all resolution steps before dispatching any parts.
Dispatch the required part based on resolution steps.
• Module Terminators and Module-to-Module Cables
• Power Supply
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