IBM 7133 D40, Service Manual

Page: 104 / 306

Maintenance Analysis Procedures (MAPs)
Are You Using the Correct Book? Do not use this book if you are servicing a 7133
Model 010, 020, 500, or 600 SSA Disk Subsystem. For the correct book, see Related
Publications in the “Additional Information” appendix (in this book) for your using
system.
These maintenance analysis procedures (MAPs) describe how to analyze a continuous
failure that has occurred in a 7133 Model D40 or Model T40 containing one or more
disk drive modules. Failing field-replaceable units (FRUs) of the 7133 can be isolated
with these MAPs.
How to Use these MAPs
Attention: Unless the using system needs to be switched off for some other reason, do
not switch 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.
v
To isolate the FRUs in the failing 7133, do the actions and answer the questions
given in these MAPs.
v
When instructed to exchange two or more FRUs in sequence:
1. Exchange the first FRU in the list for a new one.
2. Verify that the problem is solved. For some problems, verification means running
the diagnostic programs (see the using-system service procedures).
3. If the problem remains:
a. Reinstall the original FRU.
b. Exchange the next FRU in the list for a new one.
4. Repeat steps 2 and 3 until either the problem is solved, or all the related FRUs
have been exchanged.
5. Do the next action indicated by the MAP.
v
See “Lights and Controls” on page 5 for locations and descriptions of the lights and
switches.
Attention: Disk drive modules are fragile. Handle them with care, and keep them well
away from strong magnetic fields.
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7133 Models D40 and T40 Service Guide