5–34
SF3x Storage Enclosure FRU Replacement
5.7.3 Replacing the Power Harness
Use the following procedure to remove and replace the storage enclosure
power harness (PN 17–03469–01):
1. Perform an orderly shutdown of the host system and
all
devices on
that bus. Remove ac power to the system(s).
2. Take the disk ISEs in
all
storage enclosures off-line:
a. Press and release all Ready buttons on the OCP. Wait for the
Ready LEDs to go out.
b. At the front of the storage enclosure, set the drive dc power
switches to
off
. The switch element LEDs should go out to indicate
that power has been removed from the disk ISE. If any LED does
not go out, suspect a faulty switch.
CAUTION
Wear an ESD grounding strap at all times while handling the
storage enclosure or any of its FRUs.
3. Remove the OCP—grasp it firmly and pull it straight out. Do not pry;
the panel comes free with a straight pull.
4. At the rear of the storage enclosure, turn off the enclosure with the ac
power switch located at the rear of the power supply.
5. Turn off the circuit breaker on the power controller.
6. Disconnect the DSSI interconnect cables from the enclosure.
7. Disconnect the ac power cord at the rear of the enclosure.
WARNING—USE TWO PEOPLE.
Releasing the latch allows the inner assembly to be removed
from the extrusion tube for this operation. Be prepared to
take the weight of the inner assembly when it comes free of
the extrusion tube. Have an ESD-protected workspace ready
to put the inner assembly on after removing it.
8. Remove the four screws in the corners of the enclosure frame and pull
the inner assembly out of the enclosure until it engages the latch.
9. Double-check the enclosure to verify that nothing can prevent the
inner assembly from being pulled out farther. Reach into the chassis
and release the latch. (It may be necessary to push the frame back
in about a quarter inch before the latch will release.) See Figure 5–5.
Pull the inner assembly free of the extrusion tube, reach into the
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