IBM 7133 Series, Service Manual

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MAP 2021: 7133 – Redundant Power
This MAP helps you to isolate FRUs that are causing a power problem on a 7133.
| Use the Link Verification service aid (see the chapter about SSA service aids in the SSA
| Adapters: User’s Guide and Maintenance Information manual) to determine which disk
drive module has ‘Power’ status. Although one of its power inputs is missing, the disk
drive module continues to work normally.
Attention: Unless the using system needs to be turned off for some other reason, do not
turn off the using system when servicing the 7133 or an SSA link. Power cables and
external SSA cables that connect the 7133 to the using system can be disconnected while
that system is running.
Chapter 2. Problem Determination Procedures
2-2021-1