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Front Backplane Assembly
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Note for Models 010 and 500:
disk drive modules at the back of the 7133 remain operational. Unless you have a
particular reason to do so, do not turn off the using system or the 7133 when removing or
installing the front backplane assembly.
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3-48
7133 Service Guide
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 ensure that all
SSA loops that pass through the front backplane assembly are not broken. (For
example, all external SSA cables are connected correctly; all disk drive modules
and, if required, dummy disk drive modules are installed correctly.)
If a loop is broken, repair it, then check whether you have solved the original
problem. If the problem remains, go to step 2.
If not already done, remove (Models 010 and 020) or open (Models 500 and 600)
the front cover (see "Covers" on page 3-2).
On Models 010 and 500, ensure that the disk drive modules at the front of the 7133
are no longer available to the using system.
On Models 020 and 600, stop all operations on the 7133, then remove power from
the 7133 (see "All Power" on page 3-7).
Carefully make a note of the locations of the disk drive modules and (if present)
dummy disk drive modules that are at the front of the 7133. This action ensures
that you reinstall the modules into their original slots. (They might not all be
connected to the same SSA loop.) Attach identifying labels to the modules if you
want to.
Remove all the disk drive modules and dummy disk drive modules from the front of
the 7133 (see "Removing a Module" on page 3-17).
The front backplane assembly can be removed while the
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