7. Remove the DASD board assembly.
8. Install the DASD board assembly by reversing the removal procedure. After exchanging an item, go to
Verify the repair.
This ends the procedure.
FC 5074, FC 5079, FC 9079 - Device board - DB3
For use by authorized service providers.
Use this procedure to remove or replace the device board - DB3 in an FC 5074, 5079, or 9079.
To remove or replace the device board (DB3):
1. Power off the expansion tower (see Power on/off the system and logical partitions).
2. Disconnect the power cord from the expansion tower.
3. Open the rear cover. See FC 5074, FC 5079, FC 5094, FC 5294, FC 9079, FC 9094 - Covers.
4. From the rear of the expansion tower do the following:
a. Remove the EMC access plate that is located directly above the tower card enclosure. Press the
surfaces of the two latching mechanisms together and tilt the top of the cover away from the frame
to remove it.
b. Remove the cables from the disk unit controller cards (IOAs) that are located inside the PCI card
enclosure and note their locations.
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 5294, 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 - FC 5074 Expansion I/O Tower. Press the
surfaces of the two latching mechanisms together and tilt the top of the cover away from the frame
to remove it.
144 Hardware (Remove and Replace; Part Locations and Listings)
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