IBM 7133 Series, Service Manual

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4
Remove the power cable
3
from the electrical power outlet and from the back of
the 7133.
5
To return power to the 7133, do this procedure in the reverse order.
Note: All the disk drive modules start their power sequence when the input voltage
is inside the specified limits. Their motors are started under control of the SSA
adapters in the using system. To prevent the need for excessive electrical current,
the disk drive modules are not all started together. A maximum of four disk drive
modules in the front of the 7133 and four disk drive modules in the back of the 7133
can be started together. At least 10 seconds must elapse before the next group of
disk drive modules is started. Normally, all the disk drive modules are running in
less than 30 seconds from the time the 7133 is turned on.
3-16
7133 Service Guide