b. Remove the control panel by pulling on the blue 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” on page 630.)
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 Table 44 on
page 737. 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
“Appendix C. Working with Electrostatic Discharge-Sensitive Parts” on
page 955).
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 “Verifying the Repair” on page 920.
This ends the procedure.
FC 5074, FC 5079 – Disk Unit – Concurrent
Note: Determine if the system has logical partitions. Go to “Determining if the
System Has Logical Partitions” on page 943, before continuing with this
procedure.
Attention: The disk unit is sensitive to electrostatic discharge (see “Appendix C.
Working with Electrostatic Discharge-Sensitive Parts” on page 955).
1. Were you directed here from “Recovery Procedures” on page 893?
Yes No
↓ Go to “Recovery Procedures” on page 893.
2. After you have determined the location of the disk unit to replace, remove the
front covers for access (see “FC 5074, FC 5079, FC 9079 – Covers” on page 623).
3. Remove the EMC access plate that is over the location of the disk unit that you
are removing.
4. To remove a disk unit using concurrent maintenance perform the following:
a. Select System Service Tools (SST). If you cannot get to SST, select DST.
Do not perform a system IPL to get to DST.
b. Select the Start a Service Tool option.
c. Select the Hardware Service Manager option.
Remove and Replace Procedures
Chapter 4. Removal and Installation Procedures 627
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