27. CAUTION:
The weight of this part or unit is between 18 and 32 kilograms (39.7 and
70.5 pounds). It takes two persons to safely lift this part or unit. (RSFTC204)
Place the Front Cage/Backplane assembly on the floor in the upright position.
28. Disconnect the control panel cable from Backplane.
29. There are hex head screws inside the Front Cage/Backplane assembly that
mount the Backplane to the cage. From inside the Front Cage, remove all but
one of the hex head screws.
30. To prevent the Backplane from falling, hold the back plane to the cage and
then remove the last screw.
31. Lay the Front Cage face down on the floor so the back plane is on top.
32. Remove the Backplane from Front Cage.
33. Close all of the connector latches on the new Backplane. The latches need to
be closed so they do not interfere with the rear cage when it is installed.
34. To complete the replacement, reverse the previous steps beginning with step
26 on page 696.
35. After exchanging an item, go to “Verifying the Repair” on page 920.
This ends the procedure.
Models 840/SB3 – Time of Day (TOD) Battery
Note: The Time of Day Battery is located in the FC 9079 base I/O tower.
CAUTION:
This product contains a lithium battery. To avoid possible explosion, do no burn,
exchange, or charge the battery. Discard the battery as instructed by local
regulations for lithium batteries. (RSFTC232)
1. Power off the expansion tower. (See “Powering On and Powering Off the
System and Logical Partitions” on page 922.)
2. Remove the power cord from the base I/O tower.
3. Open the rear cover. (See “FC 5074, FC 5079, FC 9079 – Covers” on page 623.)
4. From the rear of the expansion tower remove the following:
a. The EMC access plate that is located directly above the PCI 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. Disconnect the cables from the top of the PCI cards and note their locations.
Attention: All cards are sensitive to electrostatic discharge (see
“Appendix C. Working with Electrostatic Discharge-Sensitive Parts” on
page 955).
c. Pull the PCI card enclosure partially out of the frame to release mechanism
stop on right side while lifting the cables clear of the enclosure.
d. Remove the PCI cards on the right side of the enclosure preventing access
to the battery from the enclosure and note their locations. (See “FC 5074, FC
5079 – Cards – Dedicated” on page 622.)
5. Remove the TOD battery. Use a flat object (screwdriver) to pry the battery out.
6. Reverse the steps to install the TOD battery.
7. After installation is complete, IPL the system in Manual Mode.
8. Have the customer set the time and date.
Remove and Replace Procedures
Chapter 4. Removal and Installation Procedures 697
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