Digital Equipment EK-SFXXS-SG-003, Service Manual

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SF7x Storage Enclosure FRU Replacement 6–49
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.
10. Loosen the four captive screws in the corners of the enclosure frame
and push the inner assembly out of the enclosure until it engages the
latch.
11. 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 6–11.
Push the inner assembly free of the extrusion tube, reach into the
inner assembly, grasp the sheet metal in front of the fan, and pull.
Set the inner assembly on an antistatic work surface.
12. Turn the inner assembly on its side and remove the acoustic panel.
Flip the frame over and remove the other acoustic panel (Figure 6–17).
13. Turn the inner assembly upside down (Figure 6–16).
14. Remove the two Phillips screws on either side of the dc power
switches. This step allows you to remove the protective cover from the
drive dc power switches. Remove this cover, exposing the wiring from
the power harness to the drive dc power switches (Figure 6–16).
15. Remove the two Phillips screws holding the power supply connector to
the frame (Figure 6–16).
16. Tilt the power supply connector so that it can be removed from the
bracket. (The connector cannot be removed unless it is tilted.)
17. Carefully remove all single-black, pigtail-black, and orange wires
from each of the drive dc power switch terminals. Each front panel
power switch wire is labeled according to its intended switch. Wires
in each group are color-coded: single-black is the SW A wire to TTM,
orange is the LED wire from the power supply to the associated
switch indicator, and the two pigtail-black wires are returns. Route
the replacement cable in the same manner as the original cable.
These wires are labeled with their respective drive positions,
corresponding to the drive dc power switches. See Figure 6–16 for
wiring information on the drive dc power switches.