Fc 5094, Fc 9094 - Disk Unit (Concurrent) - IBM iSeries 270 Service Manual

Note: Both ends of the ribbon cables are marked LH or RH, indicating that one end of the cable is
plugged in to either the left-hand (DB1) or right-hand (DB2) DASD board assembly. The other end
of the cable is plugged in to either the left-most (LH) or right-most (RH) DASD controller card. The
cables will crisscross in the center of the tower.
c. Remove the screws that hold the tower card enclosure to the frame.
d. Pull the tower card enclosure partially out of the frame while lifting the cables clear of the
enclosure.
e. Press the release mechanism that is located along the top right side of the enclosure and carefully
slide the enclosure towards you. Make sure that the cables are clear of the enclosure.
f. Remove the tower card enclosure from the frame.
g. Remove the screws from the EMC access plate that is located inside the frame and directly above
the power distribution board.
h. Remove the EMC access plate.
i. Reach through the opening and remove the cables from the backside of the base DASD board
assembly (DB3).
5. Open the front cover. See FC 5074, FC 5079, FC 5094, FC 9079, FC 9094 - Covers.
6. From the front of the expansion tower do the following:
a. Note the removable media locations and then remove them by pulling out on the handles that are
located on each side of the unit.
b. Remove the control panel by pulling on the handles that are located on each side of the unit and
sliding it partially out of the tower. Then, unplug the cable from the rear of the control panel. (See
FC 5074, FC 5079 - Control panel - NB1.)
c. Unplug the control panel cable from the base DASD board assembly (DB3).
d. Remove the two retaining screws that are located inside of the removable media enclosure (the top
right and lower left corners).
e. Remove the removable media enclosure.
f. Remove the EMC access plates from the disk unit enclosures that are located in front of the
backplane (DB3). For location information, see Locations and addresses. Press the surfaces of the
two latching mechanisms together and tilt the top of the cover away from the frame to remove it.
g. Record the disk unit locations and then remove them from the disk unit enclosures that you just
uncovered.
Attention: The disk units are sensitive to electrostatic discharge (see "Work with electrostatic
discharge-sensitive parts" on page 585).
h. Remove the screws that hold the disk unit enclosures to the frame.
i. Remove the retaining screws that are located inside the disk unit enclosure.
j. Remove the disk unit enclosures.
k. Remove the screws that hold the center support bracket and shelf for the disk unit and removable
media enclosure to the frame.
l. Remove the support bracket and shelf.
m. Remove the base DASD board assembly (DB3).
7. Install the base DASD board assembly by reversing the removal procedure. After exchanging an item,
go to Verify the repair.
This ends the procedure.

FC 5094, FC 9094 - Disk unit (concurrent)

For use by authorized service providers.
Use this procedure to remove or replace a disk unit using concurrent maintenance in an FC 5094, or FC
9094.
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Hardware (Remove and Replace; Part Locations and Listings)