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).
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 5074, FC 5079 - Disk unit (concurrent)
For use by authorized service providers.
Use this procedure to remove or replace the disk unit (concurrently) in an FC 5074 or FC 5079.
Attention: The disk unit is sensitive to electrostatic discharge (see Work with electrostatic
discharge-sensitive parts).
To remove or replace the disk unit (concurrent):
1. Determine if the system has logical partitions. Go to Determine if the system has logical partitions
before continuing with this procedure.
2. Were you directed here from the Recovery procedures topic?
v No: Go to “Recovery procedures” on page 539.
v Yes: After you have determined the location of the disk unit to replace, remove the front covers for
access. See FC 5074, FC 5079, FC 5094, FC 5294, FC 9079, FC 9094 - Covers.
3.
Remove the EMC access plate that is over the location of the disk unit that you are removing.
4. Remove the disk unit by performing 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 Start a Service Tool —> Hardware Service Manager.
c. Select Device Concurrent Maintenance and enter the required information in the information
fields.
d. Press Enter on the console. After the delay time, the light above the device location will begin
flashing. You now have 9 seconds to pinch the two surfaces of the latching mechanism together
and rotate the handle of the disk unit towards you. Pull the disk unit partially out of the tower. The
light above the device location will go off and remain off as soon as the device is no longer making
contact with the backplane.
Attention: If you remove the device when the light is not flashing, data may be lost, the disk unit
may be damaged, or the backplane may be damaged.
Analyze hardware problems 145
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